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1. First observation and study of the K ± → π 0 π 0 μ ± ν decay

Author

The NA48/2 collaboration, J. R. Batley, G. Kalmus, C. Lazzeroni, D. J. Munday, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Maier, A. Norton, M. Patel, A. Peters, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, P. Dalpiaz, C. Damiani, M. Fiorini, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, W. Baldini, A. Cotta Ramusino, A. Gianoli, M. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, G. Ruggiero, A. Bizzeti, M. Veltri, M. Behler, K. Eppard, M. Hita-Hochgesand, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M. D. Wood, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, P. Cenci, M. Pepe, M. C. Petrucci, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, G. Collazuol, L. Di Lella, G. Lamanna, I. Mannelli, A. Michetti, C. Cerri, R. Fantechi, B. Bloch-Devaux, C. Cheshkov, J. B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, S. Bifani, M. Clemencic, S. Goy Lopez, C. Biino, N. Cartiglia, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, L. Widhalm, S. Balev, P. L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, A. Korotkova, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Stoynev, and A. Zinchenko

Subjects
Branching fraction, Fixed Target Experiments, Rare Decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The NA48/2 experiment at CERN reports the first observation of the K ± → π 0 π 0 μ ± ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c 4 is measured to be (0.65 ± 0.03) × 10 −6. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10 −6, in agreement with chiral perturbation theory predictions.

Published
2024
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2. Measurement of the K+ → π+γγ decay

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V.W.S. Wong, D. Bryman, J. Fu, Z. Hives, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, B. De Martino, M. Perrin-Terrin, B. Döbrich, S. Lezki, A.T. Akmete, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, A. Mazzolari, I. Neri, A. Norton, F. Petrucci, M. Soldani, H. Wahl, L. Bandiera, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, A. Sytov, E. Iacopini, G. Latino, M. Lenti, P. Lo Chiatto, I. Panichi, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, M. D'Errico, D. Di Filippo, R. Fiorenza, R. Giordano, P. Massarotti, M. Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, A. Briano Olvera, J. Engelfried, N. Estrada-Tristan, M.A. Reyes Santos, K.A. Rodriguez Rivera, P. Boboc, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, M. Ceoletta, H. Danielsson, N. De Simone, F. Duval, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Kenworthy, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, J. Sanders, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, P. Rubin, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, S. Fedotov, K. Gorshanov, E. Gushchin, V. Kekelidze, D. Kereibay, S. Kholodenko, A. Khotyantsev, A. Korotkova, Y. Kudenko, V. Kurochka, V. Kurshetsov, L. Litov, D. Madigozhin, M. Medvedeva, A. Mefodev, M. Misheva, N. Molokanova, S. Movchan, V. Obraztsov, A. Okhotnikov, A. Ostankov, I. Polenkevich, Yu. Potrebenikov, A. Sadovskiy, V. Semenov, S. Shkarovskiy, V. Sugonyaev, O. Yushchenko, and A. Zinchenko

Subjects
Physics, QC1-999
Abstract

A sample of 3984 candidates of the K+→π+γγ decay, with an estimated background of 291±14 events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. The decay branching ratio in the full kinematic range is measured to be (9.61±0.17)×10−7. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process K+→π+a, a→γγ is also reported.

Published
2024
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3. Improved calorimetric particle identification in NA62 using machine learning techniques

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, W. Fedorko, T. Numao, Y. Petrov, B. Velghe, V. W. S. Wong, M. Yu, D. Bryman, J. Fu, Z. Hives, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, B. De Martino, M. Perrin-Terrin, A. T. Akmete, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, A. Mazzolari, I. Neri, A. Norton, F. Petrucci, M. Soldani, H. Wahl, L. Bandiera, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, A. Sytov, E. Iacopini, G. Latino, M. Lenti, P. Lo Chiatto, I. Panichi, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, M. D’Errico, D. Di Filippo, R. Fiorenza, R. Giordano, P. Massarotti, M. Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, A. Briano Olvera, J. Engelfried, N. Estrada-Tristan, M. A. Reyes Santos, P. Boboc, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, M. Ceoletta, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Kenworthy, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, J. Sanders, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, P. Rubin, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, S. Fedotov, K. Gorshanov, E. Gushchin, V. Kekelidze, D. Kereibay, S. Kholodenko, A. Khotyantsev, A. Korotkova, Y. Kudenko, V. Kurochka, V. Kurshetsov, L. Litov, D. Madigozhin, M. Medvedeva, A. Mefodev, M. Misheva, N. Molokanova, S. Movchan, V. Obraztsov, A. Okhotnikov, A. Ostankov, I. Polenkevich, Yu. Potrebenikov, A. Sadovskiy, V. Semenov, S. Shkarovskiy, V. Sugonyaev, O. Yushchenko, and A. Zinchenko

Subjects
Fixed Target Experiments, Branching fraction, Rare Decay, Flavour Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Measurement of the ultra-rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay at the NA62 experiment at CERN requires high-performance particle identification to distinguish muons from pions. Calorimetric identification currently in use, based on a boosted decision tree algorithm, achieves a muon misidentification probability of 1.2 × 10 −5 for a pion identification efficiency of 75% in the momentum range of 15–40 GeV/c. In this work, calorimetric identification performance is improved by developing an algorithm based on a convolutional neural network classifier augmented by a filter. Muon misidentification probability is reduced by a factor of six with respect to the current value for a fixed pion-identification efficiency of 75%. Alternatively, pion identification efficiency is improved from 72% to 91% for a fixed muon misidentification probability of 10 −5.

Published
2023
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4. A study of the K + → π 0 e + νγ decay

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V. W. S. Wong, D. Bryman, J. Fu, Z. Hives, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, B. De Martino, M. Perrin-Terrin, A. T. Akmete, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, A. Mazzolari, I. Neri, A. Norton, F. Petrucci, M. Soldani, H. Wahl, L. Bandiera, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, A. Sytov, E. Iacopini, G. Latino, M. Lenti, P. Lo Chiatto, I. Panichi, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, M. D’Errico, D. Di Filippo, R. Fiorenza, R. Giordano, P. Massarotti, M. Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, A. Briano Olvera, J. Engelfried, N. Estrada-Tristan, M. A. Reyes Santos, P. Boboc, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, M. Ceoletta, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Kenworthy, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, J. Sanders, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, P. Rubin, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, S. Fedotov, K. Gorshanov, E. Gushchin, V. Kekelidze, D. Kereibay, S. Kholodenko, A. Khotyantsev, A. Korotkova, Y. Kudenko, V. Kurochka, V. Kurshetsov, L. Litov, D. Madigozhin, M. Medvedeva, A. Mefodev, M. Misheva, N. Molokanova, S. Movchan, V. Obraztsov, A. Okhotnikov, A. Ostankov, I. Polenkevich, Yu. Potrebenikov, A. Sadovskiy, V. Semenov, S. Shkarovskiy, V. Sugonyaev, O. Yushchenko, and A. Zinchenko

Subjects
Branching fraction, Electroweak Interaction, Fixed Target Experiments, Flavour Physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract A sample of 1.3 × 105 K + → π 0 e + νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.

Published
2023
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5. Addendum to: A measurement of the K + → π + μ + μ − decay

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V. W. S. Wong, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, R. Fiorenza, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published
2023
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6. Performance of the NA62 trigger system

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V. W. S. Wong, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, R. Fiorenza, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Fixed Target Experiments, Flavour Physics, Flavour Changing Neutral Currents, Rare Decay, Trigger, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The NA62 experiment at CERN targets the measurement of the ultra-rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay, and carries out a broad physics programme that includes probes for symmetry violations and searches for exotic particles. Data were collected in 2016–2018 using a multi-level trigger system, which is described highlighting performance studies based on 2018 data.

Published
2023
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7. Search for K+ decays into the π+e+e−e+e− final state

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V.W.S. Wong, D. Bryman, J. Fu, Z. Hives, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, B. De Martino, M. Perrin-Terrin, A.T. Akmete, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, A. Mazzolari, I. Neri, A. Norton, F. Petrucci, M. Soldani, H. Wahl, L. Bandiera, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, A. Sytov, E. Iacopini, G. Latino, M. Lenti, P. Lo Chiatto, I. Panichi, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, M. D'Errico, D. Di Filippo, R. Fiorenza, R. Giordano, P. Massarotti, M. Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, A. Briano Olvera, J. Engelfried, N. Estrada-Tristan, M.A. Reyes Santos, P. Boboc, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, M. Ceoletta, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Kenworthy, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, J. Sanders, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, P. Rubin, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, S. Fedotov, K. Gorshanov, E. Gushchin, V. Kekelidze, D. Kereibay, S. Kholodenko, A. Khotyantsev, A. Korotkova, Y. Kudenko, V. Kurochka, V. Kurshetsov, L. Litov, D. Madigozhin, M. Medvedeva, A. Mefodev, M. Misheva, N. Molokanova, S. Movchan, V. Obraztsov, A. Okhotnikov, A. Ostankov, I. Polenkevich, Yu. Potrebenikov, A. Sadovskiy, V. Semenov, S. Shkarovskiy, V. Sugonyaev, O. Yushchenko, and A. Zinchenko

Subjects
Physics, QC1-999
Abstract

The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.

Published
2023
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8. A measurement of the K + → π + μ + μ − decay

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V. W. S. Wong, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, R. Fiorenza, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Branching fraction, Fixed Target Experiments, Flavour Changing Neutral Currents, Rare Decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract A sample of 2.8 × 104 K + → π + μ + μ − candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017–2018. The model-independent branching fraction is measured to be (9.15 ± 0.08) × 10 −8, a factor three more precise than previous measurements. The decay form factor is presented as a function of the squared dimuon mass. A measurement of the form factor parameters and their uncertainties is performed using a description based on Chiral Perturbation Theory at O $$ \mathcal{O} $$ (p 6).

Published
2022
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9. A search for the K+ → μ−νe+e+ decay

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V.W.S. Wong, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, R. Fiorenza, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Kaon decays, Lepton number violation, Lepton flavour violation, Physics, QC1-999
Abstract

A search for the K+→μ−νe+e+ decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of 8.1×10−11 is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search.

Published
2023
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10. Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
FCNC Interaction, Flavour Changing Neutral Currents, Rare decay, Fixed target experiments, Flavor physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The NA62 experiment reports the branching ratio measurement BR K + → π + ν ν ¯ = 10.6 − 3.4 + 4.0 stat ± 0.9 syst × 10 − 11 $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^{-11} $$ at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10 −11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10 −11. This measurement is also used to set limits on BR(K + → π + X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.

Published
2021
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11. Searches for lepton number violating K+ → π−(π0)e+e+ decays

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V.W.S. Wong, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, R. Fiorenza, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Physics, QC1-999
Abstract

Searches for lepton number violating K+→π−e+e+ and K+→π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 5.3×10−11 and 8.5×10−10 are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+→π−π0e+e+ decay rate.

Published
2022
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12. Search for a feebly interacting particle X in the decay K + → π + X

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, R. Marchevski, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Beyond Standard Model, Exotics, Fixed target experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract A search for the K + → π + X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c 2 and 154–260 MeV/c 2, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K + → π + X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.

Published
2021
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13. An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, R. Marchevski, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Fixed target experiments, Flavor physics, Flavour Changing Neutral Currents, Rare decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The NA62 experiment reports an investigation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ mode from a sample of K + decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10 −10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10 −11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10 −10 for the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of ( 0.48 − 0.48 + 0.72 $$ {0.48}_{-0.48}^{+0.72} $$ ) × 10 −10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.

Published
2020
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14. Search for production of an invisible dark photon in π 0 decays

Author

The NA62 collaboration, E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, G. Georgiev, V. Kozhuharov, L. Litov, T. Numao, Y. Petrov, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Lanfranchi, G. Mannocchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D’Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E. B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M. B. Brunetti, V. Duk, V. Fascianelli, J. R. Fry, F. Gonnella, E. Goudzovski, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J. B. Dainton, R. W. L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Beyond Standard Model, Exotics, Fixed target experiments, Rare decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The results of a search for π 0 decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 × 108 tagged π 0 mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass, improving on previous searches in the mass range 60–110 MeV/c 2. The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay π 0 → γ ν ν ¯ $$ {\pi}^0\to \gamma \nu \overline{\nu} $$ , improving the current limit by more than three orders of magnitude.

Published
2019
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15. First search for K+→π+νν¯ using the decay-in-flight technique

Author

E. Cortina Gil, E. Minucci, S. Padolski, P. Petrov, B. Velghe, G. Georgiev, V. Kozhuharov, L. Litov, T. Numao, D. Bryman, J. Fu, T. Husek, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, R. Marchevski, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, E. Gamberini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Bizzeti, F. Bucci, R. Volpe, A. Antonelli, G. Lamanna, G. Lanfranchi, G. Mannocchi, S. Martellotti, M. Moulson, M. Raggi, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, V. Duk, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, R. Piandani, J. Pinzino, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, L. Federici, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, A. Kleimenova, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, A. Shaikhiev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, M. Koval, Z. Kucerova, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Gatignon, R. Guida, F. Hahn, B. Jenninger, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, V. Ryjov, S. Venditti, M.B. Brunetti, V. Fascianelli, F. Gonnella, E. Goudzovski, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J.B. Dainton, J.R. Fry, L. Fulton, D. Hutchcroft, E. Maurice, G. Ruggiero, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Physics, QC1-999
Abstract

The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×1011 K+ decays collected in 2016. The single event sensitivity is 3.15×10−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10−10 on the K+→π+νν¯ branching ratio at 95% CL.

Published
2019
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16. First observation and study of the K± → π±π0e+e− decay

Author

J.R. Batley, G. Kalmus, C. Lazzeroni, D.J. Munday, M.W. Slater, S.A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Maier, A. Norton, M. Patel, A. Peters, S. Balev, P.L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, P. Dalpiaz, C. Damiani, M. Fiorini, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, W. Baldini, A. Cotta Ramusino, A. Gianoli, M. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, G. Ruggiero, A. Bizzeti, M. Veltri, M. Behler, K. Eppard, M. Hita-Hochgesand, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M.D. Wood, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, P. Cenci, M. Pepe, M.C. Petrucci, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, G. Collazuol, L. DiLella, G. Lamanna, I. Mannelli, A. Michetti, C. Cerri, R. Fantechi, B. Bloch-Devaux, C. Cheshkov, J.B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, S. Bifani, M. Clemencic, S. Goy Lopez, C. Biino, N. Cartiglia, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm

Subjects
Physics, QC1-999
Abstract

The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003–2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K±→π±π0e+e−)=(4.24±0.14)×10−6. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.

Published
2019
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17. Search for K+ decays to a muon and invisible particles

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Physics, QC1-999
Abstract

The NA62 experiment at CERN reports searches for K+→μ+N and K+→μ+νX decays, where N and X are massive invisible particles, using the 2016–2018 data set. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−8) of the neutrino mixing parameter |Uμ4|2 for N masses in the range 200–384 MeV/c2 and lifetime exceeding 50 ns. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10–370 MeV/c2 are reported for the first time, ranging from O(10−5) to O(10−7). An improved upper limit of 1.0×10−6 is established at 90% CL on the K+→μ+ννν¯ branching fraction.

Published
2021
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18. Search for heavy neutral lepton production in K+ decays to positrons

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Physics, QC1-999
Abstract

A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by the NA62 experiment at CERN in 2017–2018 is reported. Upper limits of the extended neutrino mixing matrix element |Ue4|2 are established at the level of 10−9 over most of the accessible heavy neutral lepton mass range 144–462 MeV/c2, with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The |Ue4|2 range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c2.

Published
2020
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19. Measurement of the form factors of charged kaon semileptonic decays

Author

The NA48/2 collaboration, J. R. Batley, G. Kalmus, C. Lazzeroni, D. J. Munday, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Maier, A. Norton, M. Patel, A. Peters, S. Balev, P. L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, P. Dalpiaz, C. Damiani, M. Fiorini, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, W. Baldini, A. Cotta Ramusino, A. Gianoli, M. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, G. Ruggiero, A. Bizzeti, M. Veltri, M. Behler, K. Eppard, M. Hita-Hochgesand, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M. D. Wood, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, P. Cenci, M. Pepe, M. C. Petrucci, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, G. Collazuol, L. DiLella, G. Lamanna, I. Mannelli, A. Michetti, C. Cerri, R. Fantechi, B. Bloch-Devaux, C. Cheshkov, J. B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, S. Bifani, M. Clemencic, S. Goy Lopez, C. Biino, N. Cartiglia, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm

Subjects
Fixed target experiments, Rare decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract A measurement of the form factors of charged kaon semileptonic decays is presented, based on 4.4 × 106 K ± → π 0 e ± ν e (K e3 ± ) and 2.3 × 106 K ± → π 0 μ±ν μ (K μ3 ± ) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. The combination of measurements in the K e3 ± and K μ3 ± modes is also presented.

Published
2018
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20. Searches for lepton number violating K+ decays

Author

E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, G. Mannocchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, and P. Rubin

Subjects
Physics, QC1-999
Abstract

The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

Published
2019
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21. Search for the dark photon in π0 decays

Author

J.R. Batley, G. Kalmus, C. Lazzeroni, D.J. Munday, M.W. Slater, S.A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Norton, A. Maier, M. Patel, A. Peters, S. Balev, P.L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, W. Baldini, A. Cotta Ramusino, P. Dalpiaz, C. Damiani, M. Fiorini, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, A. Bizzeti, M. Lenti, M. Veltri, M. Calvetti, E. Celeghini, E. Iacopini, G. Ruggiero, M. Behler, K. Eppard, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M.D. Wood, P. Cenci, M. Pepe, M.C. Petrucci, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, C. Cerri, R. Fantechi, G. Collazuol, L. DiLella, G. Lamanna, I. Mannelli, A. Michetti, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, B. Bloch-Devaux, C. Cheshkov, J.B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, C. Biino, N. Cartiglia, F. Marchetto, S. Bifani, M. Clemencic, S. Goy Lopez, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm

Subjects
Physics, QC1-999
Abstract

A sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon (A′) production in the π0→γA′ decay followed by the prompt A′→e+e− decay. No signal is observed, and an exclusion region in the plane of the dark photon mass mA′ and mixing parameter ε2 is established. The obtained upper limits on ε2 are more stringent than the previous limits in the mass range 9 MeV/c2

Published
2015
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22. SOCIAL COST OF FEMALE URINARY INCONTINENCE: EPIDEMIOLOGY, COST OF ILLNESS AND COST/EFFECTIVENESS ANALYSIS

Author

F. BERNASCONI, M. GRASSO, C. MANTOVANI, E. LUCCHINI, S. ARIENTI, and C. CERRI

Subjects
Diseases of the genitourinary system. Urology, RC870-923
Abstract

This paper presents the results of a broad, transversal, observational survey on the social cost of female urinary incontinence in the general female population, resident in the ASL3-Monza area. In this population, in an 18- 65 year old age group, the prevalence of U.I. observed is 28.5% (LIFE cases) and 18.6% (YEAR cases). The total number of incontinent women in the ASL3-Monza area and in the Lombardy Region can be estimated as follows: - ASL3-Monza 125,288 “LIFE” cases, 81,767 (18.6% of 439,609) “YEAR” cases. - Lombardy Region 1,119,480 “LIFE” cases, 730,608 (18.6% of 3,928,709) “YEAR” cases. In the light of the data collected, we can estimate that in the Lombardy Region and in the ASL3-Monza area, at least 379,600 (52% of 730,608) and 42,518 (52% of 81,767) incontinent women use protection and 175,200 (24% of 730,608) and 19,624 (24% of 81,767) consider using a pad to be the only useful solution to the problem. The “estimated” mean/annual cost per woman in an incontinent population with characteristics similar to those of the general female population of the ASL3-Monza is € 358,03, for a mean/life cost per woman of € 11.099,20.When there is no effective treatment of the symptom, we can estimate the following total cost/life in the ASL3-Monza area to be: 65,414 x 31 x € 358,03 = € 726.025.407. If the symptom disappears and the treatment is effective, this is also an advantage, apart from the obvious requirement for public health related to it, from a strictly pharmacological-economic point of view. The estimated total/life cost for the treatment (with the most effective medical, rehabilitative and/or surgical therapy available today) of a sample of 1,000 incontinent women of the ASL3- Monza area is significatively lower than the total cost/life expected in the case of persistence and “assistance” of the symptom: € 4.502.812,10 vs. € 23.451.270,02. Despite the methodological limits of a pilot study (single centre collection of data, limited samples, analysis of “theoretical” populations), from the data collected it appears clear that the more incisive and determined the strategy of information and education, and the fuller and earlier the diagnosis, the more significative the social- economic, as well as the psycho-social saving.

Published
2010
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23. Uro-rehabilitation and effort urinary incontinence: medium-term results and analysis of the failure risk factors.

Author

F. BERNASCONI, G. PISANI, S. ARIENTI, B. VERONESE, S. PITTALIS, M. CONTI, M. TASSI, S. GELOSA, A. BIELLA, and C. CERRI

Subjects
Diseases of the genitourinary system. Urology, RC870-923
Abstract

Sono state studiate 110 pazienti consecutive giunte per la prima volta all’Ambulatorio di Uro-ginecologia dell’Ospedale di Desio per una incontinenza urinaria da sforzo e sottoposte a trattamento uroriabilitativo presso la Divisione di Neuroriabilitazione dell’Ospedale di Seregno negli anni 1998- 2000.

Published
2010
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24. On the impact of grassland management on soil carbon stocks: a worldwide meta-analysis

Author

K. Phukubye, M. Mutema, N. Buthelezi, P. Muchaonyerwa, C. Cerri, V. Chaplot, School of Agricultural, Earth and Environmental Sciences (SAEES), University of KwaZulu-Natal [Durban, Afrique du Sud] (UKZN), Agricultural Research Council-Institute for Agricultural Engineering, Luiz de Queiroz College of Agriculture, Universidade de São Paulo = University of São Paulo (USP), Variabilité de l'Océan et de la Glace de mer (VOG), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), and Water Research Commission of the Republic of South Africa (WRC K5/2266).

Subjects
Soil Science, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], PASTAGENS
Abstract

International audience; Grasslands occupy 70% of whole agricultural land and hold significant amounts of carbon, a key element in the regulation of Earth's soils fertility, biomass production and climate. Previous work has shown that carbon stocks of grassland soils have been largely depleted worldwide due to missuse or mismanagement but that shifts in management could also potentially increase soil carbon stocks and mitigate against the degradation of natural ecosystems. However, the existing literature points to large discrepancies in the impact of grassland management practices on soil carbon, which the present study investigated. Here we considered 235 experimental sites in 18 countries across the world where shifts in grassland management involved different grazing strategies (free, F vs controlled, C; high, H vs low, L density grazers), grazers exclusion (E), mowing (M) and burning (B). The best performing practice was controlled grazing with high density of grazers (CHG) with an average soil organic carbon content (SOCC) increase of 21% and with 100% of the studies pointing to a SOCC increase. This was followed by E (14.9%; 60%) and FLG (13.3%; 80%). On average, burning grasslands, decreases SOCC by 9.3% but 31% of the studies pointed to an increase, thus indicating discrepancies in the impact of grassland management. CLG and mowing did not significantly impact SOCC. These results also indicated that B decreased SOCC the most under moist to humid climates (−10.9% vs −1.7% under arid to semi-arid), while that E was only beneficial in arid to semi-arid grasslands. Adoption of rotational high-intensity grazing in place of free grazing grasslands, should be seriously considered by policy and decision makers to mitigate against climate change while fostering economic and social development.

Published
2022

25. Measurement of the very rare $K^+ \to \pi^+ \nu \bar\nu$ decay

Author

Michal Zamkovský, Riccardo Aliberti, F. Ambrosino, Roberto Ammendola, Bruno ANGELUCCI, A. Antonelli, G Anzivino, Roberta Arcidiacono, T. Bache, Aigul Baeva, D. Baigarashev, M. Barbanera, J. Bernhard, A. Biagioni, Lubos Bician, Cristina Biino, Andrea Bizzeti, T. Blazek, Brigitte BlochDevaux, V. Bonaiuto, M. Boretto, M. Bragadireanu, D. Britton, Francesco Brizioli, M.B. Brunetti, D. Bryman, Francesca Bucci, Tiziana Capussela, J. Carmignani, Augusto Ceccucci, P. Cenci, V. Cerny, C. Cerri, B. Checcucci, A. Conovaloff, P. Cooper, Eduardo Cortina Gil, M. Corvino, F. Costantini, Angelo Cotta Ramusino, A. Coward, G. D’Agostini, John Dainton, P. Dalpiaz, Hans Danielsson, N. De Simone, D. Di Filippo, Luigi Di Lella, Niels Doble, Babette Dobrich, F. Duval, V. Duk, D. Emelyanov, Jurgen Engelfried, T. Enik, Nora Estrada-Tristan, Valeri Falaleev, R. Fantechi, V. Fascianelli, Luca Federici, S. Fedotov, Alessandra Filippi, Massimiliano Fiorini, J. Fry, J. Fu, Adolfo Fucci, L. Fulton, Enrico Gamberini, Lau Gatignon, G. Georgiev, S. Ghinescu, Alberto Gianoli, M. Giorgi, Sergio Giudici, Francesco Gonnella, Evgueni Goudzovski, C. Graham, Roberto Guida, Evgeny Gushchin, F. Hahn, H. Heath, J. Henshaw, E.B. Holzer, Tomas Husek, O. Hutanu, D. Hutchcroft, L. Iacobuzio, Enrico Iacopini, Ermanno Imbergamo, B. Jenninger, Jan Jerhot, R.W. Jones, K. Kampf, Vladimir Kekelidze, Sergei Kholodenko, G. Khoriauli, A. Khotyantsev, Alina Kleimenova, A. Korotkova, Michal Koval, Venelin Kozhuharov, Zuzana Kucerova, Y. Kudenko, J. Kunze, V. Kurochka, V. Kurshetsov, Gaia Lanfranchi, Gianluca Lamanna, E. Lari, G. Latino, Paul Laycock, Cristina Lazzeroni, M. Lenti, G. Lehmann Miotto, E. Leonardi, P. Lichard, Leandar Litov, R. Lollini, D. Lomidze, Alessandro Lonardo, Pasquale Lubrano, Matteo Lupi, N. Lurkin, Dmitry Madigozhin, I. Mannelli, Alessandro Mapelli, Flavio Marchetto, Radoslav Marchevski, S. Martellotti, Paolo Massarotti, Karim Massri, E. Maurice, M. Medvedeva, A. Mefodev, E. Menichetti, Ernesto Migliore, E. Minucci, M. Mirra, M. Misheva, Natalia Molokanova, Matthew Moulson, S. Movchan, M. Napolitano, I. Neri, F. Newson, Alan Norton, Matthew Noy, Toshio Numao, Vladimir Obraztsov, A. Ostankov, S. Padolski, R. Page, V. Palladino, A. Parenti, Chris John Parkinson, E. Pedreschi, Monica Pepe, M. Perrin-Terrin, L. Peruzzo, P. Petrov, Y. Petrov, Ferruccio Petrucci, Roberto Piandani, M. Piccini, Jacopo Pinzino, I. Polenkevich, L. Pontisso, Yuri Potrebenikov, D. Protopopescu, Mauro Raggi, Angela Romano, P. Rubin, Giuseppe Ruggiero, Vladimir Ryjov, A. Salamon, C. Santoni, G. Saracino, F. Sargeni, S. Schuchmann, Vitali Semenov, Antonino Sergi, A. Shaikhiev, Sergey Shkarovskiy, D. Soldi, V. Sugonyaev, M. Sozzi, T. Spadaro, F. Spinella, A. Sturgess, Joel Swallow, Stoyan Miroslavov Trilov, Paolo Valente, Bob Velghe, Stefano Venditti, P. Vicini, Roberta Volpe, M. Vormstein, Heinrich Wahl, Rainer Wanke, B. Wrona, O. Yushchenko, and A. Zinchenko

Subjects
Nuclear Physics - Experiment, Particle Physics - Experiment
Abstract

The decay $K^+\to\pi^+\nu\bar{\nu}$, with a very precisely predicted branching ratio of less than $10^{-10}$, is among the best processes to reveal indirect effects of new physics. The NA62 experiment at CERN SPS is designed to study the $K^+\to\pi^+\nu\bar{\nu}$ decay and to measure its branching ratio using a decay-in-flight technique. NA62 took data in 2016, 2017 and 2018, reaching the sensitivity of the Standard Model for the $K^+\to\pi^+\nu\bar{\nu}$ decay by the analysis of the 2016 and 2017 data, and providing the most precise measurement of the branching ratio to date by the analysis of the 2018 data. This measurement is also used to set limits on BR($K^+\to\pi^+X$), where $X$ is a scalar or pseudo-scalar particle. The final result of the BR($K^+\to\pi^+\nu\bar{\nu}$) measurement and its interpretation in terms of the $K^+\to\pi^+ X$ decay from the analysis of the full 2016-2018 data set is presented, and future plans and prospects are reviewed.

Published
2022

26. Search for Lepton Number and Flavor Violation in K+ and π0 Decays

Author

L. Bician, J. Swallow, L. Di Lella, M. Misheva, H. O. Danielsson, G. Lehmann Miotto, Alessandro Lonardo, D. Soldi, D. Protopopescu, S. Martellotti, Luca Pontisso, Nicolas Lurkin, C. Graham, M. B. Brunetti, Claudio Santoni, V. Falaleev, A. Conovaloff, L. Federici, M. Vormstein, Babette Döbrich, A. M. Bragadireanu, K. Massri, B. Angelucci, A. Filippi, A. I. Zinchenko, L. Iacobuzio, E. B. Holzer, A. Salamon, G. Khoriauli, B. Wrona, C. J. Parkinson, F. Brizioli, Cristina Biino, E. Imbergamo, M. Moulson, S. Movchan, C. Lazzeroni, F. Ambrosino, T. Capussela, A. Gianoli, Y. Petrov, L. Fulton, D. Baigarashev, R. Fantechi, Rainer Wanke, C. Cerri, Mauro Piccini, Georgi P. Georgiev, Roberto Guida, Viacheslav Duk, Paul Laycock, E. Minucci, F. Duval, P. Rubin, Roberto Ammendola, Karol Kampf, S. Trilov, P. Lubrano, M. Sozzi, Paolo Massarotti, T. Numao, Fabrizio Petrucci, Emilio Leonardi, A. Baeva, Paolo Valente, Tomáš Husek, J. L. Fu, Leander Litov, I. Polenkevich, R. Page, V. Fascianelli, M. Perrin-Terrin, V. Palladino, P. F. Dalpiaz, Ilaria Neri, Vincenzo Bonaiuto, A. Fucci, N. Doble, F. Hahn, T. Enik, Douglas Bryman, Sergei Fedotov, N. De Simone, R. Marchevski, E. Gamberini, E. Lari, Mauro Raggi, D. T. Madigozhin, Antonino Sergi, Yu. Potrebenikov, M. Koval, G. Lamanna, Vladimir Ryjov, Giuseppe Latino, D. Coward, G. Saracino, L. Gatignon, A. Korotkova, M. Medvedeva, Giuseppe Ruggiero, M. Corvino, P. Petrov, Dave Britton, N. Estrada-Tristan, A. Mapelli, Evgueni Goudzovski, Yu.A. Kudenko, Jürgen Engelfried, S. Giudici, F. Bucci, G. D'Agostini, Vladimir Kekelidze, E. Iacopini, Matteo Lupi, D. Emelyanov, A. Sturgess, J. B. Dainton, S. Venditti, E. Menichetti, M. Pepe, A. Khotyantsev, F. Costantini, A. Ceccucci, B. Checcucci, R. W. L. Jones, G. Anzivino, Andrea Biagioni, R. Volpe, B. Jenninger, N. A. Molokanova, Andrea Bizzeti, O. Hutanu, Mattia Barbanera, M. Fiorini, M. Napolitano, S. Ghinescu, J. Henshaw, A. Shaikhiev, Francesco Gonnella, A. Antonelli, E. Maurice, Mario Giorgi, Jacopo Pinzino, V. Kurochka, Tomas Blazek, V. Kozhuharov, L. Peruzzo, M. Zamkovsky, D. Di Filippo, A. Cotta Ramusino, B. Bloch-Devaux, J. Jerhot, F. Newson, Roberta Arcidiacono, V. Cerny, S. Shkarovskiy, F. Marchetto, V. Obraztsov, Piero Vicini, S. Schuchmann, Helen F Heath, V. E. Semenov, E. Gushchin, P. Lichard, Z. Kucerova, H. D. Wahl, E. Pedreschi, A. Romano, Fausto Sargeni, M. Mirra, A P Ostankov, Matthew Noy, M. Boretto, E. Cortina Gil, Roberto Piandani, P. Cenci, Johannes Bernhard, J. Kunze, G. Lanfranchi, A. Parenti, F. Spinella, R. Lollini, B. Velghe, J. Carmignani, Ernesto Migliore, M. Lenti, S. Padolski, J. R. Fry, V. Sugonyaev, T. Bache, R. Aliberti, A. Norton, D. Lomidze, D. E. Hutchcroft, O. Yushchenko, V. Kurshetsov, S. Kholodenko, Tommaso Spadaro, P. Cooper, A. Mefodev, I. Mannelli, and A. Kleimenova

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Flavour, General Physics and Astronomy, 01 natural sciences, Lepton number, 0103 physical sciences, Pi, High Energy Physics::Experiment, 010306 general physics, Lepton
Abstract

Searches for the lepton number violating $K^{+} \rightarrow \pi^{-} \mu^{+} e^{+}$ decay and the lepton flavour violating $K^{+} \rightarrow \pi^{+} \mu^{-} e^{+}$ and $\pi^{0} \rightarrow \mu^{-} e^{+}$ decays are reported using data collected by the NA62 experiment at CERN in $2017$-$2018$. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level: $\mathcal{B}(K^{+}\rightarrow\pi^{-}\mu^{+}e^{+})

Published
2021

27. First search for K+→π+νν¯ using the decay-in-flight technique

Author

Semenov, A. M. Bragadireanu, E. Cortina Gil, G. Saracino, G. Ruggiero, G. Anzivino, Roberto Piandani, L. Peruzzo, R Laycock, M. Moulson, Mauro Piccini, G. Lehmann Miotto, C. Graham, B. Bloch-Devaux, S. Movchan, C. Lazzeroni, F. Ambrosino, M. Sozzi, M. Lenti, N. Doble, Karol Kampf, A. Salamon, G. Khoriauli, D. E. Hutchcroft, S. Padolski, O. Yushchenko, Kozhuharov, F. Brizioli, K. Massri, L. Bician, R. Fantechi, Fabrizio Petrucci, M. Boretto, Luca Federici, Ilaria Neri, J. Swallow, Yu. Potrebenikov, Leander Litov, A. Kleimenova, T. Enik, Douglas Bryman, Fry, Sergei Fedotov, Obraztsov, A. Romano, Fausto Sargeni, Jürgen Engelfried, Giuseppe Latino, H. O. Danielsson, R Massarotti, Z. Kucerova, S. Kholodenko, A. Mapelli, M. Vormstein, P. Cenci, D. Soldi, Luca Pontisso, S. Giudici, A P Ostankov, A. Mefodev, Palladino, Bonaiuto, J. L. Fu, B. Angelucci, R Valente, Kurshetsov, J. Kunze, A. Sturgess, A. Conovaloff, R Dalpiaz, R. Volpe, F. Spinella, Claudio Santoni, Sugonyaev, Kurochka, R. Lollini, I. Mannelli, R Rubin, T. Spadaro, Ernesto Migliore, Alessandro Lonardo, L. Fulton, F. Duval, David Lomidze, N. A. Molokanova, Cerny, C. Cerri, T. Capussela, S. Trilov, G. Lanfranchi, Andrea Biagioni, M. Fiorini, Mauro Raggi, Roberta Arcidiacono, M. Napolitano, A. Gianoli, Georgi P. Georgiev, D. Protopopescu, M. Koval, T. Numao, E. Gushchin, Emilie Maurice, S. Venditti, G. Lamanna, Yu. G. Kudenko, J. Pinzino, Christopher John Parkinson, Cristina Biino, Nicolas Lurkin, Fascianelli, Tomáš Husek, Dave Britton, N. Estrada-Tristan, A. Shaikhiev, B Doebrich, F. Bucci, Milena Misheva, M. B. Brunetti, Roberto Ammendola, G. D'Agostini, E. Minucci, D. T. Madigozhin, M. Pepe, Duk, L. Di Lella, R. Aliberti, E. Pedreschi, A. Norton, A. Antonelli, O. Hutanu, A. Korotkova, E. Iacopini, Matteo Lupi, M. Mirra, A.I. Zinchenko, M. Zamkovsky, R. Page, A. Filippi, B. Wrona, A. Khotyantsev, F. Marchetto, M. Perrin-Terrin, S. Ghinescu, A. Ceccucci, Piero Vicini, R Lichard, A. Fucci, Helen F Heath, B. Checcucci, R. Marchevski, Antonino Sergi, Andrea Bizzeti, R Cooper, L. Gatignon, M. Corvino, D. Coward, E. Imbergamo, R. Guida, Rainer Wanke, Francesco Gonnella, Tomas Blazek, R Lubrano, A. Cotta Ramusino, S. Martellotti, M. Noy, Mattia Barbanera, N. De Simone, F. Newson, S. Shkarovskiy, H. D. Wahl, J. B. Dainton, Ryjov, M. Medvedeva, P. Petrov, Evgueni Goudzovski, B. Velghe, F. Costantini, B. Jenninger, E. Menichetti, Mario Giorgi, D. Di Filippo, L. Iacobuzio, Emilio Leonardi, I. Polenkevich, Falaleev, G. Mannocchi, E. Gamberini, F. Hahn, and Kekelidze

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, European research, Library science, 01 natural sciences, Bildung, Research council, Basic research, 0103 physical sciences, Russian federation, Christian ministry, 010306 general physics, Research center
Abstract

The cost of the experiment and of its auxiliary systems were supported by the funding agencies of the Collaboration Institutes. We are particularly indebted to: F.R.S.-FNRS (Fonds de la Recherche Scientifique - FNRS), Belgium; BMES (Ministry of Education, Youth and Science), Bulgaria; NSERC (Natural Sciences and Engineering Research Council), Canada; NRC (National Research Council) contribution to TRIUMF, Canada; MEYS (Ministry of Education, Youth and Sports), Czech Republic; BMBF (Bundesministerium fur Bildung und Forschung) contracts 05H12UM5 and 05H15UMCNA, Germany; INFN (Istituto Nazionale di Fisica Nucleare), Italy; MIUR (Ministero dell'Istruzione, dell'Universita e della Ricerca), Italy; CONACyT (Consejo Nacional de Ciencia y Tecnologia), Mexico; IFA (Institute of Atomic Physics), Romania; INR-RAS (Institute for Nuclear Research of the Russian Academy of Sciences), Moscow, Russia; JINR (Joint Institute for Nuclear Research), Dubna, Russia; NRC (National Research Center) “Kurchatov Institute” and MESRF (Ministry of Education and Science of the Russian Federation), Russia; MESRS (Ministry of Education, Science, Research and Sport), Slovakia; CERN (European Organization for Nuclear Research), Switzerland; STFC (Science and Technology Facilities Council), United Kingdom; NSF (National Science Foundation) Award Number 1506088, U.S.A.; ERC (European Research Council) “UniversaLepto” advanced grant 268062, “KaonLepton” starting grant 336581, Europe. Individuals have received support from: Charles University (project GA UK number 404716), Czech Republic; Ministry of Education, Universities and Research (MIUR “Futuro in ricerca 2012” grant RBFR12JF2Z, Project GAP), Italy; Russian Foundation for Basic Research (RFBR grants 18-32-00072, 18-32-00245), Russia; the Royal Society (grants UF100308, UF0758946), United Kingdom; STFC (Rutherford fellowships ST/J00412X/1, ST/M005798/1), United Kingdom; ERC (grants 268062, 336581).

Published
2019

28. Search for a feebly interacting particle X in the decay K+ → π+X

Author

L. Peruzzo, B. Bloch-Devaux, E. Imbergamo, V. Cerny, R. Fantechi, L. Di Lella, D. Emelyanov, Z. Kucerova, S. Padolski, Antonino Sergi, Yu. Potrebenikov, A. Salamon, Paul Laycock, Milena Misheva, A. Antonelli, D. Soldi, V. Palladino, A. Romano, Fausto Sargeni, K. Massri, R. W. L. Jones, M. Perrin-Terrin, D. Coward, A. Fucci, D. T. Madigozhin, L. Fulton, F. Duval, F. Brizioli, G. Khoriauli, Tommaso Spadaro, A P Ostankov, Fabrizio Petrucci, Rainer Wanke, M. Corvino, Andrea Biagioni, R. Volpe, T. Bache, B. Wrona, G. Lamanna, E. Menichetti, M. Fiorini, A. Baeva, H. D. Wahl, A. Sturgess, J. B. Dainton, Evgueni Goudzovski, J. Fu, Mauro Raggi, G. Lanfranchi, P. F. Dalpiaz, R. Marchevski, E. Gamberini, L. Gatignon, Leander Litov, M. Koval, J. Swallow, E. Cortina Gil, M. Vormstein, M. Piccini, Jürgen Engelfried, N. Doble, Vladimir Kekelidze, Matteo Lupi, V. Fascianelli, P. Rubin, Yu.A. Kudenko, H. O. Danielsson, Jacopo Pinzino, G. Lehmann Miotto, V. Obraztsov, C. Graham, V. Falaleev, A. Conovaloff, T. Numao, Paolo Valente, D. Protopopescu, A. Mefodev, E. Minucci, N. A. Molokanova, Babette Döbrich, Luca Pontisso, E. Iacopini, Nicolas Lurkin, M. B. Brunetti, V. E. Semenov, I. Mannelli, M. Napolitano, C. J. Parkinson, R. Piandani, L. Federici, V. Kozhuharov, N. Estrada-Tristan, M. Zamkovsky, Dave Britton, Georgi P. Georgiev, Viacheslav Duk, S. Martellotti, J. Jerhot, P. Petrov, B. Angelucci, L. Iacobuzio, E. B. Holzer, V. Sugonyaev, A. Ceccucci, Roberto Ammendola, A. M. Bragadireanu, Andrea Bizzeti, C. Cerri, A. Korotkova, Paolo Massarotti, M. Moulson, S. Trilov, Johannes Bernhard, V. Kurochka, A. Parenti, F. Spinella, D. Baigarashev, Claudio Santoni, A. Filippi, A. I. Zinchenko, Helen F Heath, R. Aliberti, R. Lollini, A. Norton, S. Schuchmann, E. Lari, Karol Kampf, A. Khotyantsev, Ernesto Migliore, S. Venditti, A. Shaikhiev, R. Page, T. Husek, J. Kunze, F. Hahn, S. Ghinescu, T. Capussela, A. Gianoli, B. Velghe, J. Carmignani, Francesco Gonnella, Tomas Blazek, A. Cotta Ramusino, D. Lomidze, D. E. Hutchcroft, Roberto Guida, O. Yushchenko, V. Kurshetsov, S. Kholodenko, B. Checcucci, P. Cooper, B. Jenninger, G. Latino, J. R. Fry, F. Bucci, Mario Giorgi, D. Di Filippo, P. Cenci, L. Bician, Roberta Arcidiacono, E. Gushchin, E. Pedreschi, M. Mirra, Matthew Noy, G. D'Agostini, M. Pepe, O. Hutanu, M. Lenti, F. Newson, S. Shkarovskiy, F. Marchetto, Piero Vicini, P. Lichard, A. Kleimenova, S. Movchan, C. Lazzeroni, F. Ambrosino, Emilio Leonardi, I. Polenkevich, M. Medvedeva, Giuseppe Ruggiero, F. Costantini, M. Boretto, M. Sozzi, Ilaria Neri, P. Lubrano, Vincenzo Bonaiuto, T. Enik, Douglas Bryman, Sergei Fedotov, N. De Simone, Vladimir Ryjov, G. Saracino, A. Mapelli, G. Anzivino, S. Giudici, E. Maurice, Alessandro Lonardo, Cristina Biino, Mattia Barbanera, Cortina Gil, E., Kleimenova, A., Minucci, E., Padolski, S., Petrov, P., Shaikhiev, A., Volpe, R., Numao, T., Velghe, B., Bryman, D., Fu, J., Husek, T., Jerhot, J., Kampf, K., Zamkovsky, M., Aliberti, R., Khoriauli, G., Kunze, J., Lomidze, D., Marchevski, R., Peruzzo, L., Vormstein, M., Wanke, R., Dalpiaz, P., Fiorini, M., Neri, I., Norton, A., Petrucci, F., Wahl, H., Cotta Ramusino, A., Gianoli, A., Iacopini, E., Latino, G., Lenti, M., Parenti, A., Bizzeti, A., Bucci, F., Antonelli, A., Georgiev, G., Kozhuharov, V., Lanfranchi, G., Martellotti, S., Moulson, M., Spadaro, T., Ambrosino, F., Capussela, T., Corvino, M., Di Filippo, D., Massarotti, P., Mirra, M., Napolitano, M., Saracino, G., Anzivino, G., Brizioli, F., Imbergamo, E., Lollini, R., Piandani, R., Santoni, C., Barbanera, M., Cenci, P., Checcucci, B., Lubrano, P., Lupi, M., Pepe, M., Piccini, M., Costantini, F., Di Lella, L., Doble, N., Giorgi, M., Giudici, S., Lamanna, G., Lari, E., Pedreschi, E., Sozzi, M., Cerri, C., Fantechi, R., Pontisso, L., Spinella, F., Mannelli, I., D???agostini, G., Raggi, M., Biagioni, A., Leonardi, E., Lonardo, A., Valente, P., Vicini, P., Ammendola, R., Bonaiuto, V., Fucci, A., Salamon, A., Sargeni, F., Arcidiacono, R., Bloch-Devaux, B., Boretto, M., Menichetti, E., Migliore, E., Soldi, D., Biino, C., Filippi, A., Marchetto, F., Engelfried, J., Estrada-Tristan, N., Bragadireanu, A. M., Ghinescu, S. A., Hutanu, O. E., Baeva, A., Baigarashev, D., Emelyanov, D., Enik, T., Falaleev, V., Kekelidze, V., Korotkova, A., Litov, L., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Polenkevich, I., Potrebenikov, Yu., Shkarovskiy, S., Zinchenko, A., Fedotov, S., Gushchin, E., Khotyantsev, A., Kudenko, Y., Kurochka, V., Medvedeva, M., Mefodev, A., Kholodenko, S., Kurshetsov, V., Obraztsov, V., Ostankov, A., Semenov, V., Sugonyaev, V., Yushchenko, O., Bician, L., Blazek, T., Cerny, V., Kucerova, Z., Bernhard, J., Ceccucci, A., Danielsson, H., De Simone, N., Duval, F., D??brich, B., Federici, L., Gamberini, E., Gatignon, L., Guida, R., Hahn, F., Holzer, E. B., Jenninger, B., Koval, M., Laycock, P., Lehmann Miotto, G., Lichard, P., Mapelli, A., Massri, K., Noy, M., Palladino, V., Perrin-Terrin, M., Pinzino, J., Ryjov, V., Schuchmann, S., Venditti, S., Bache, T., Brunetti, M. B., Duk, V., Fascianelli, V., Fry, J. R., Gonnella, F., Goudzovski, E., Iacobuzio, L., Lazzeroni, C., Lurkin, N., Newson, F., Parkinson, C., Romano, A., Sergi, A., Sturgess, A., Swallow, J., Heath, H., Page, R., Trilov, S., Angelucci, B., Britton, D., Graham, C., Protopopescu, D., Carmignani, J., Dainton, J. B., Jones, R. W. L., Ruggiero, G., Fulton, L., Hutchcroft, D., Maurice, E., Wrona, B., Conovaloff, A., Cooper, P., Coward, D., and Rubin, P.

Subjects
Exotics, Nuclear and High Energy Physics, Physics beyond the Standard Model, Dark matter, NA62 experiment, 01 natural sciences, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, 010306 general physics, Physics, Range (particle radiation), Large Hadron Collider, kaon decays, hep-ex, 010308 nuclear & particles physics, Branching fraction, Settore FIS/04, Fixed target experiments, Beyond Standard Model, lcsh:QC770-798, Particle, Atomic physics, Particle Physics - Experiment, Order of magnitude
Abstract

A search for the $K^+ \to \pi^+ X$ decay, where $X$ is a long-lived feebly interacting particle, is performed through an interpretation of the $K^+ \to \pi^+ \nu \bar\nu$ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of $X$ masses, $0-110$ MeV/$c^2$ and $154-260$ MeV/$c^2$, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR($K^+ \to \pi^+ X$), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude. A search for the K$^{+}$ → π$^{+}$X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K$^{+}$ → $ {\pi}^{+}\nu \overline{\nu} $ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c$^{2}$ and 154–260 MeV/c$^{2}$, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K$^{+}$ → π$^{+}$X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude. A search for the $K^{+}\rightarrow\pi^{+}X$ decay, where $X$ is a long-lived feebly interacting particle, is performed through an interpretation of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of $X$ masses, $0$-$110\,\text{MeV}/c^{2}$ and $154$-$260\,\text{MeV}/c^{2}$, and lifetimes above $100\,\text{ps}$ are considered. The limits set on the branching ratio, $\text{BR}(K^{+}\rightarrow\pi^{+}X)$, are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.

Published
2021

29. Search for π0 decays to invisible particles

Author

V. Palladino, A. Fucci, M. Boretto, J. Fu, L. Gatignon, E. Cortina Gil, Mattia Barbanera, S. Martellotti, Paul Laycock, B. Angelucci, L. Iacobuzio, E. B. Holzer, M. Sozzi, Mauro Piccini, M. Corvino, T. Bache, Paolo Massarotti, A. Mefodev, S. Venditti, A. Shaikhiev, E. Lari, J. Swallow, H. O. Danielsson, I. Mannelli, P. Rubin, Ilaria Neri, M. Vormstein, N. Estrada-Tristan, Vincenzo Bonaiuto, L. Peruzzo, B. Bloch-Devaux, F. Hahn, D. E. Hutchcroft, T. Enik, Douglas Bryman, O. Yushchenko, Sergei Fedotov, Claudio Santoni, Luca Pontisso, B. Velghe, J. Carmignani, A. Filippi, E. Iacopini, A. I. Zinchenko, S. Movchan, C. Lazzeroni, F. Ambrosino, Francesco Gonnella, Tomas Blazek, S. Ghinescu, P. Lubrano, Vladimir Ryjov, L. Federici, G. Lanfranchi, A. Conovaloff, A. Cotta Ramusino, T. Capussela, V. Cerny, A. Gianoli, V. Kurshetsov, V. Obraztsov, A. Mapelli, L. Di Lella, S. Kholodenko, D. Protopopescu, Roberto Guida, Nicolas Lurkin, M. B. Brunetti, Evgueni Goudzovski, Georgi P. Georgiev, Viacheslav Duk, R. Fantechi, V. E. Semenov, S. Giudici, S. Padolski, E. Imbergamo, Rainer Wanke, M. Perrin-Terrin, Johannes Bernhard, Z. Kucerova, Tommaso Spadaro, Roberto Ammendola, A. Parenti, P. Cooper, Vladimir Kekelidze, N. De Simone, F. Spinella, D. T. Madigozhin, D. Soldi, R. Lollini, A. Korotkova, B. Jenninger, J. R. Fry, Matteo Lupi, Ernesto Migliore, K. Massri, A. Salamon, E. Maurice, P. F. Dalpiaz, R. Marchevski, B. Wrona, Andrea Biagioni, R. Volpe, Alessandro Lonardo, E. Gamberini, F. Brizioli, M. Fiorini, Mario Giorgi, D. Di Filippo, P. Petrov, L. Fulton, F. Duval, V. Sugonyaev, E. Minucci, M. Lenti, Mauro Raggi, A. Khotyantsev, F. Bucci, Milena Misheva, R. Aliberti, A. Norton, A. Antonelli, T. Husek, G. Saracino, A. Baeva, J. Jerhot, Cristina Biino, Yu.A. Kudenko, Jürgen Engelfried, N. Doble, G. Anzivino, G. Lamanna, J. Kunze, V. Fascianelli, A. Kleimenova, Antonino Sergi, A. Sturgess, J. B. Dainton, G. Lehmann Miotto, C. Graham, V. Falaleev, D. Emelyanov, Babette Döbrich, C. J. Parkinson, V. Kozhuharov, M. Zamkovsky, R. W. L. Jones, Helen F Heath, Yu. Potrebenikov, Giuseppe Latino, D. Coward, R. Page, C. Cerri, S. Trilov, F. Newson, S. Shkarovskiy, G. Khoriauli, M. Medvedeva, Giuseppe Ruggiero, D. Lomidze, E. Menichetti, F. Costantini, Emilio Leonardi, I. Polenkevich, Jacopo Pinzino, L. Bician, Roberta Arcidiacono, E. Gushchin, P. Cenci, E. Pedreschi, M. Mirra, A. M. Bragadireanu, A. Romano, Fausto Sargeni, M. Moulson, D. Baigarashev, Karol Kampf, Fabrizio Petrucci, Leander Litov, A P Ostankov, Matthew Noy, M. Koval, H. D. Wahl, G. D'Agostini, N. A. Molokanova, M. Pepe, M. Napolitano, O. Hutanu, F. Marchetto, Piero Vicini, P. Lichard, T. Numao, Paolo Valente, R. Piandani, Dave Britton, A. Ceccucci, B. Checcucci, Andrea Bizzeti, V. Kurochka, S. Schuchmann, Cortina Gil, E., Kleimenova, A., Minucci, E., Padolski, S., Petrov, P., Shaikhiev, A., Volpe, R., Numao, T., Velghe, B., Bryman, D., Fu, J., Husek, T., Jerhot, J., Kampf, K., Zamkovsky, M., Aliberti, R., Khoriauli, G., Kunze, J., Lomidze, D., Marchevski, R., Peruzzo, L., Vormstein, M., Wanke, R., Dalpiaz, P., Fiorini, M., Neri, I., Norton, A., Petrucci, F., Wahl, H., Cotta Ramusino, A., Gianoli, A., Iacopini, E., Latino, G., Lenti, M., Parenti, A., Bizzeti, A., Bucci, F., Antonelli, A., Georgiev, G., Kozhuharov, V., Lanfranchi, G., Martellotti, S., Moulson, M., Spadaro, T., Ambrosino, F., Capussela, T., Corvino, M., Di Filippo, D., Massarotti, P., Mirra, M., Napolitano, M., Saracino, G., Anzivino, G., Brizioli, F., Imbergamo, E., Lollini, R., Piandani, R., Santoni, C., Barbanera, M., Cenci, P., Checcucci, B., Lubrano, P., Lupi, M., Pepe, M., Piccini, M., Costantini, F., Di Lella, L., Doble, N., Giorgi, M., Giudici, S., Lamanna, G., Lari, E., Pedreschi, E., Sozzi, M., Cerri, C., Fantechi, R., Pontisso, L., Spinella, F., Mannelli, I., D???agostini, G., Raggi, M., Biagioni, A., Leonardi, E., Lonardo, A., Valente, P., Vicini, P., Ammendola, R., Bonaiuto, V., Fucci, A., Salamon, A., Sargeni, F., Arcidiacono, R., Bloch-Devaux, B., Boretto, M., Menichetti, E., Migliore, E., Soldi, D., Biino, C., Filippi, A., Marchetto, F., Engelfried, J., Estrada-Tristan, N., Bragadireanu, A. M., Ghinescu, S. A., Hutanu, O. E., Baeva, A., Baigarashev, D., Emelyanov, D., Enik, T., Falaleev, V., Kekelidze, V., Korotkova, A., Litov, L., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Polenkevich, I., Potrebenikov, Y., Shkarovskiy, S., Zinchenko, A., Fedotov, S., Gushchin, E., Khotyantsev, A., Kudenko, Y., Kurochka, V., Medvedeva, M., Mefodev, A., Kholodenko, S., Kurshetsov, V., Obraztsov, V., Ostankov, A., Semenov, V., Sugonyaev, V., Yushchenko, O., Bician, L., Blazek, T., Cerny, V., Kucerova, Z., Bernhard, J., Ceccucci, A., Danielsson, H., De Simone, N., Duval, F., D??brich, B., Federici, L., Gamberini, E., Gatignon, L., Guida, R., Hahn, F., Holzer, E. B., Jenninger, B., Koval, M., Laycock, P., Lehmann Miotto, G., Lichard, P., Mapelli, A., Massri, K., Noy, M., Palladino, V., Perrin-Terrin, M., Pinzino, J., Ryjov, V., Schuchmann, S., Venditti, S., Bache, T., Brunetti, M. B., Duk, V., Fascianelli, V., Fry, J. R., Gonnella, F., Goudzovski, E., Iacobuzio, L., Lazzeroni, C., Lurkin, N., Newson, F., Parkinson, C., Romano, A., Sergi, A., Sturgess, A., Swallow, J., Heath, H., Page, R., Trilov, S., Angelucci, B., Britton, D., Graham, C., Protopopescu, D., Carmignani, J., Dainton, J. B., Jones, R. W. L., Ruggiero, G., Fulton, L., Hutchcroft, D., Maurice, E., Wrona, B., Conovaloff, A., Cooper, P., Coward, D., and Rubin, P.

Subjects
Exotics, branching ratio: upper limit [pi0], Nuclear and High Energy Physics, Particle physics, Meson, NA62 experiment, 01 natural sciences, NA62, Standard Model, High Energy Physics - Experiment, 0103 physical sciences, mixing, ddc:530, fluctuation [background], pi0: branching ratio: upper limit, K: branching ratio, 010306 general physics, invisible decay [pi0], Physics, lifetime, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, Branching fraction, Settore FIS/04, branching ratio [K], pi0: invisible decay, Fermion, CERN SPS, hidden sector, Fixed target experiments, Rare decay, coupling [fermion], Beyond Standard Model, Higgs boson, axion-like particles, background: fluctuation, High Energy Physics::Experiment, fermion: coupling, Particle Physics - Experiment, experimental results
Abstract

Journal of high energy physics 02(2), 201 (2021). doi:10.1007/JHEP02(2021)201, The NA62 experiment at the CERN SPS reports a study of a sample of $4 \times10^{9}$ tagged $\pi^0$ mesons from $K^+ \to \pi^+ \pi^0 (\gamma)$, searching for the decay of the $\pi^0$ to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of $4.4 \times10^{-9}$ is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model-independent upper limit on the branching ratio for the decay $K^+ \to \pi^+ X$, where $X$ is a particle escaping detection with mass in the range 0.110-0.155 GeV$/c^2$ and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming $X$ to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson., Published by SISSA, [Trieste]

Published
2021

30. Latest results on rare kaon decays from the NA48/2 experiment at CERN

Author

E. M. Gersabeck, M. C. Petrucci, C. Cerri, N. Doble, Stoyan Stoynev, W. Kubischta, C. Damiani, G. Marel, D. J. Munday, Rainer Wanke, B. Bloch-Devaux, P. Rubin, M. Ziolkowski, Anne Dabrowski, M. Pepe, A. Winhart, M. Holder, E. C. Swallow, E. Imbergamo, G. Bocquet, Yu. Potrebenikov, A. Michetti, Peter Zahariev Hristov, Konrad Kleinknecht, Emmanuel Monnier, M. Markytan, M. Lenti, B. Renk, C. Lazzeroni, P. Marouelli, F. Marchetto, C. Morales Morales, L. Widhalm, D. Coward, Vladimir Kekelidze, V. Falaleev, M. Valdata-Nappi, G. Ruggiero, A. Peters, Evgueni Goudzovski, B. Vallage, Mayda Velasco, W. Baldini, A. Gonidec, E. Iacopini, V. Kozhuharov, G. Collazuol, N. A. Molokanova, Andreas Alexander Maier, K. Eppard, U. Moosbrugger, S. Venditti, Cvetan Valeriev Cheshkov, S. Shkarovskiy, T. Fonseca Martin, J.B. Cheze, G. Lamanna, H. D. Wahl, Luca Fiorini, Nicolo Cartiglia, S. Balev, M. Martini, M. Fidecaro, R. Fantechi, A. Gianoli, M. Scarpa, I. Mannelli, Ivan Mikulec, Milene Calvetti, B. Peyaud, P. F. Dalpiaz, Fabrizio Petrucci, M. Veltri, S. Goy Lopez, G. E. Kalmus, Marco Clemencic, H. Dibon, Leander Litov, A. Norton, Roland Winston, Simone Bifani, M. Shieh, P.L. Frabetti, M. Wache, L. Masetti, Mauro Raggi, I. Polenkevich, D. T. Madigozhin, M. D. Wood, Alan W. Walker, Mark Slater, E. Mazzucato, F. Costantini, Milena Misheva, Jacqueline Batley, A. Ceccucci, Andrea Bizzeti, Michal Szleper, Nicola Cabibbo, P. Cenci, M. Savrie, J. Derre, Roberta Arcidiacono, G. Neuhofer, M. Behler, M. Patel, D.C. Cundy, A.I. Zinchenko, A. Nappi, M. Raggi, Manfred Jeitler, G. Anzivino, G.M. Pierazzini, L. Gatignon, M. Sozzi, S. A. Wotton, L. DiLella, Cristina Biino, S. Giudici, M. Fiorini, and Mauro Piccini

Subjects
Physics, Particle physics, Large Hadron Collider, High Energy Physics::Experiment, Nuclear Physics - Experiment, Particle Physics - Experiment
Abstract

The NA48/2 experiment at CERN reports the first observation of the K->pi0e+e-decay from an exposure of 1.7x10^11 charged kaon decays recorded in 2003-2004. A sample of 4919candidates with 4.9% background contamination allows the determination of the branching ratioin the full kinematic region. The study of the kinematic space shows evidence for a structuredependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million Ke3 and 2.3 million Km3 events collected in 2004 will also be presented.

Published
2021

31. Measurement of the very rare K^{+} + →{\pi}^{+}\nu \overline{\nu}π + ν ν decay

Author

Paul Laycock, L. Di Lella, D. Lomidze, Yu. Potrebenikov, Vladimir Ryjov, D. E. Hutchcroft, O. Yushchenko, G. Saracino, Giuseppe Latino, D. Coward, E. Cortina Gil, M. Perrin-Terrin, Antonino Sergi, S. Venditti, A. Shaikhiev, A. Mapelli, G. Lanfranchi, V. Kurshetsov, V. Fascianelli, Rainer Wanke, B. Wrona, S. Kholodenko, S. Giudici, V. Palladino, Y. Petrov, F. Marchetto, F. Hahn, Piero Vicini, A. Fucci, Mattia Barbanera, V. Kurochka, Yu.A. Kudenko, A. Sturgess, G. Anzivino, V. Cerny, S. Padolski, P. Cooper, M. Boretto, J. B. Dainton, P. Lichard, N. A. Molokanova, A. Korotkova, J. Henshaw, S. Ghinescu, Georgi P. Georgiev, Viacheslav Duk, A. Kleimenova, M. Sozzi, B. Jenninger, B. Velghe, J. Carmignani, S. Schuchmann, E. Pedreschi, M. Napolitano, Ilaria Neri, C. Cerri, Roberto Ammendola, S. Trilov, Vincenzo Bonaiuto, T. Enik, Douglas Bryman, Sergei Fedotov, L. Gatignon, Emilio Leonardi, Fabrizio Petrucci, N. Doble, E. Minucci, P. Lubrano, D. Soldi, Andrea Biagioni, R. Volpe, M. Fiorini, Mario Giorgi, D. Di Filippo, A. Romano, Fausto Sargeni, M. Mirra, V. Sugonyaev, A. Norton, Leander Litov, I. Polenkevich, V. Kozhuharov, M. Zamkovsky, G. Khoriauli, Alessandro Lonardo, A P Ostankov, Johannes Bernhard, S. Movchan, Matthew Noy, C. Lazzeroni, F. Ambrosino, N. De Simone, P. Rubin, Mauro Piccini, E. Maurice, R. Aliberti, M. Koval, D. T. Madigozhin, Paolo Massarotti, A. Parenti, J. Jerhot, M. Vormstein, E. Menichetti, F. Spinella, Cristina Biino, K. Massri, A. Baeva, J. R. Fry, Helen F Heath, H. O. Danielsson, E. Lari, Evgueni Goudzovski, R. Lollini, G. Lehmann Miotto, G. D'Agostini, A. M. Bragadireanu, L. Bician, D. Protopopescu, Nicolas Lurkin, M. Medvedeva, Giuseppe Ruggiero, C. Graham, A. Salamon, M. Pepe, E. Iacopini, Roberta Arcidiacono, D. Emelyanov, Ernesto Migliore, M. B. Brunetti, M. Corvino, T. Bache, M. Moulson, V. Falaleev, J. Kunze, F. Brizioli, O. Hutanu, E. Gushchin, D. Baigarashev, J. Swallow, T. Numao, Karol Kampf, Matteo Lupi, Babette Döbrich, R. W. L. Jones, Paolo Valente, L. Fulton, F. Duval, J. L. Fu, Luca Pontisso, Jacopo Pinzino, Claudio Santoni, R. Fantechi, F. Costantini, A. Filippi, A. I. Zinchenko, V. Obraztsov, Dave Britton, A. Conovaloff, C. J. Parkinson, G. Lamanna, H. Wahl, L. Federici, V. E. Semenov, L. Peruzzo, S. Martellotti, T. Capussela, A. Ceccucci, A. Gianoli, M. Lenti, B. Bloch-Devaux, B. Angelucci, L. Iacobuzio, E. B. Holzer, P. Cenci, Vladimir Kekelidze, B. Checcucci, Andrea Bizzeti, Roberto Guida, E. Imbergamo, R. Piandani, T. Husek, F. Newson, S. Shkarovskiy, Mauro Raggi, R. Page, Z. Kucerova, F. Bucci, Milena Misheva, A. Antonelli, P. F. Dalpiaz, R. Marchevski, E. Gamberini, Jürgen Engelfried, Tommaso Spadaro, Francesco Gonnella, Tomas Blazek, A. Cotta Ramusino, P. Petrov, A. Khotyantsev, A. Mefodev, I. Mannelli, N. Estrada-Tristan, and UCL - SST/IRMP - Institut de recherche en mathématique et physique

Subjects
Physics, FCNC Interaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, hep-ex, Flavour Changing Neutral Currents, Analytical chemistry, QC770-798, 01 natural sciences, Standard Model, Flavor physics, Rare decay, Fixed target experiments, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, Sensitivity (control systems), 010306 general physics, Particle Physics - Experiment
Abstract

The NA62 experiment reports the branching ratio measurement $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^{-11} $$ BR K + → π + ν ν ¯ = 10.6 − 3.4 + 4.0 stat ± 0.9 syst × 10 − 11 at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K+→$$ {\pi}^{+}\nu \overline{\nu} $$ π + ν ν ¯ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. This measurement is also used to set limits on BR(K+→ π+X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.

Published
2021

32. An investigation of the very rare $ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $ decay

Author

H. O. Danielsson, Luca Pontisso, L. Federici, P. F. Dalpiaz, R. Marchevski, E. Gamberini, Jürgen Engelfried, A. Sturgess, Vladimir Ryjov, J. B. Dainton, Antonino Sergi, Paul Laycock, Fabrizio Petrucci, M. Medvedeva, Giuseppe Ruggiero, T. Numao, Paolo Valente, D. E. Hutchcroft, F. Marchetto, M. Lenti, M. Perrin-Terrin, D. Lomidze, Piero Vicini, O. Yushchenko, L. Peruzzo, S. Martellotti, A. Mapelli, V. Palladino, F. Costantini, P. Lubrano, P. Lichard, B. Angelucci, B. Bloch-Devaux, L. Bician, Leander Litov, G. Lanfranchi, V. Obraztsov, L. Iacobuzio, E. B. Holzer, S. Giudici, P. Rubin, J. R. Fry, Tommaso Spadaro, R. Piandani, A. Fucci, Roberta Arcidiacono, F. Hahn, Vladimir Kekelidze, V. Kurshetsov, Georgi P. Georgiev, E. Cortina Gil, D. Emelyanov, V. E. Semenov, Dave Britton, Mattia Barbanera, Viacheslav Duk, N. De Simone, S. Kholodenko, E. Gushchin, M. Boretto, G. Lehmann Miotto, C. Graham, E. Maurice, S. Movchan, C. Lazzeroni, A. Ceccucci, E. Iacopini, V. Falaleev, B. Checcucci, L. Di Lella, Roberto Ammendola, F. Ambrosino, Andrea Bizzeti, Babette Döbrich, P. Cooper, G. D'Agostini, B. Velghe, J. Carmignani, E. Minucci, M. Sozzi, V. Cerny, Claudio Santoni, M. Pepe, Johannes Bernhard, E. Pedreschi, Andrea Biagioni, R. Volpe, C. J. Parkinson, S. Padolski, F. Newson, S. Shkarovskiy, M. Fiorini, R. Page, A. Filippi, A. I. Zinchenko, J. Fu, Rainer Wanke, O. Hutanu, A. Mefodev, H. D. Wahl, Yu. Potrebenikov, Francesco Gonnella, R. Fantechi, B. Wrona, A. Parenti, A. Salamon, L. Gatignon, J. Jerhot, Giuseppe Latino, M. Mirra, Z. Kucerova, I. Mannelli, N. Estrada-Tristan, G. Saracino, D. Coward, F. Brizioli, M. Koval, F. Spinella, T. Capussela, Evgueni Goudzovski, A. Gianoli, Mauro Piccini, Roberto Guida, S. Venditti, A. Shaikhiev, Tomas Blazek, A. Romano, Fausto Sargeni, Paolo Massarotti, R. Lollini, Ilaria Neri, Vincenzo Bonaiuto, G. Anzivino, Yu.A. Kudenko, T. Enik, Tomáš Husek, Douglas Bryman, Sergei Fedotov, A P Ostankov, V. Sugonyaev, F. Bucci, A. Cotta Ramusino, V. Kozhuharov, Milena Misheva, V. Kurochka, Ernesto Migliore, M. Zamkovsky, Matthew Noy, Mauro Raggi, E. Lari, R. W. L. Jones, D. T. Madigozhin, G. Khoriauli, M. Corvino, Alessandro Lonardo, M. Vormstein, T. Bache, Emilio Leonardi, S. Ghinescu, S. Schuchmann, R. Aliberti, A. Norton, Matteo Lupi, A. Antonelli, Helen F Heath, I. Polenkevich, D. Soldi, P. Cenci, Cristina Biino, K. Massri, A. M. Bragadireanu, B. Jenninger, D. Protopopescu, E. Menichetti, Nicolas Lurkin, M. B. Brunetti, J. Kunze, L. Fulton, F. Duval, Mario Giorgi, D. Di Filippo, M. Moulson, V. Fascianelli, P. Petrov, D. Baigarashev, A. Khotyantsev, Karol Kampf, E. Imbergamo, Jacopo Pinzino, G. Lamanna, N. Doble, A. Kleimenova, N. A. Molokanova, M. Napolitano, C. Cerri, S. Trilov, A. Korotkova, A. Baeva, J. Swallow, A. Conovaloff, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and European Project: 268062,EC:FP7:ERC,ERC-2010-AdG_20100224,UNIVERSALEPTO(2011)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Physics beyond the Standard Model, Flavour Changing Neutral Currents, 01 natural sciences, Standard Model, Flavor physics, Fixed target experiments, Rare decay, 0103 physical sciences, Pi, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, Sensitivity (control systems), 010306 general physics
Abstract

The NA62 experiment reports an investigation of the $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ K + → π + ν ν ¯ mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ K + → π + ν ν ¯ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of ($$ {0.48}_{-0.48}^{+0.72} $$ 0.48 − 0.48 + 0.72 ) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.

Published
2020

33. Searches for lepton flavour and lepton number violation in K$^+$ decays

Author

G. Mannocchi, Tomáš Husek, K. Massri, P. S. Cooper, D. T. Madigozhin, D. Soldi, R. Marchevski, Antonino Sergi, F. Hahn, Matteo Lupi, J. R. Fry, C. Cerri, S. Trilov, V. Kurochka, R. Guida, T. Bache, L. Iacobuzio, S. Schuchmann, R. Fantechi, P. F. Dalpiaz, M. Raggi A. Romano, Claudio Santoni, Emilio Leonardi, Christopher John Parkinson, L. Fulton, F. Duval, David Lomidze, Roberto Piandani, J. Kunze, E. Minucci, A. Filippi, G. D'Agostini, M. Pepe, V. Sugonyaev, G. Saracino, A.I. Zinchenko, N. Doble, I. Polenkevich, A. Mefodev, D. Coward, O. Hutanu, Jürgen Engelfried, E. Pedreschi, V. Fascianelli, R. Aliberti, A. Norton, T. Capussela, A. Gianoli, V. Obraztsov, F. Bucci, G. Ruggiero, J. Carmignani, V. E. Semenov, Milena Misheva, M. Mirra, G. Lehmann Miotto, G. Lamanna, I. Mannelli, P. Petrov, C. Graham, Babette Döbrich, Yu. Kudenko, G. Anzivino, A. Sturgess, N. A. Molokanova, Evgueni Goudzovski, H. O. Danielsson, Mattia Barbanera, D. E. Hutchcroft, S. Padolski, M. Sozzi, V. Palladino, Fausto Sargeni, A. Antonelli, M. Napolitano, O. Yushchenko, Luca Pontisso, V. Kurshetsov, E. Gamberini, M. Fiorini, A. Fucci, Angelo Biagioni, A P Ostankov, T. Numao, S. Kholodenko, Ilaria Neri, Vincenzo Bonaiuto, B. Angelucci, R. Volpe, Roberta Arcidiacono, B. Velghe, T. Enik, Douglas Bryman, L. Peruzzo, B. Bloch-Devaux, Sergei Fedotov, Vladimir Kekelidze, B. Jenninger, Alessandro Lonardo, Mauro Piccini, Paolo Massarotti, E. Lari, E. Gushchin, F. Newson, V. Cerny, Rainer Wanke, Aigul Baeva, R. D. page, Augusto Ceccucci, Z. Kucerova, F. Marchetto, Piero Vicini, L. Gatignon, M. Corvino, D. Protopopescu, Emilie Maurice, Nicolas Lurkin, Mario Giorgi, P. Rubin, D. Di Filippo, S. Shkarovskiy, M. B. Brunetti, G. Khoriauli, M. Lenti, R. W. L. Jones, Yu. Potrebenikov, P. Lichard, E. Iacopini, Giuseppe Latino, J. B. Dainton, M. Perrin-Terrin, Cristina Biino, J. Jerhot, L. Di Lella, Tommaso Spadaro, M. Boretto, V. Kozhuharov, M. Zamkovsky, Vladimir Ryjov, Johannes Bernhard, Helen F Heath, A. Parenti, F. Spinella, S. Movchan, C. Lazzeroni, F. Ambrosino, R. Lollini, Ernesto Migliore, A. Mapelli, B. Wrona, P. Lubrano, S. Giudici, M. Vormstein, P. Cenci, J. L. Fu, M. Koval, S. Venditti, A. Shaikhiev, A. Khotyantsev, S. Ghinescu, M. Bragadireanu, A. Korotkova, E. Imbergamo, V. Falaleev, Francesco Gonnella, L. Bician, Luca Federici, J. Swallow, Tomas Blazek, A. Cotta Ramusino, A. Conovaloff, J. Pinzino, Fabrizio Petrucci, Leander Litov, A. Kleimenova, Y. Petrov, Georgi P. Georgiev, Viacheslav Duk, Roberto Ammendola, A. Salamon, F. Brizioli, M. Moulson, Paul Laycock, Karol Kampf, H. D. Wahl, Paolo Valente, G. Lanfranchi, Dave Britton, N. Estrada-Tristan, B. Checcucci, Andrea Bizzeti, S. Martellotti, E. B. Holzer, M. Noy, E. Menichetti, N. De Simone, M. Medvedeva, and F. Costantini

Subjects
Physics, Particle physics, Range (particle radiation), Large Hadron Collider, Settore FIS/04, Flavour, NA62 experiment, Lepton number, Charged particle, Standard Model (mathematical formulation), High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Lepton
Abstract

The NA62 experiment at the CERN SPS is designed to conduct precision tests of the Standard Model by studying rare decays of charged kaons. NA62 took data in 2016-2018 and collected a large sample of charged kaon decays into final states with multiple charged particles. The sensitivity to a range of lepton flavour and lepton number violating kaon decays provided by this data set is improved over the previously reported measurements. Results from the searches of $K^+→ π^-l^+l^+$ decays with a partial NA62 data sample are presented.

Published
2020

35. Search forK+→π+νν‾at NA62

Author

R. Volpe, G. Aglieri Rinella, R. Aliberti, F. Ambrosino, R. Ammendola, B. Angelucci, A. Antonelli, G. Anzivino, R. Arcidiacono, I. Azhinenko, S. Balev, M. Barbanera, J. Bendotti, A. Biagioni, L. Bician, C. Biino, A. Bizzeti, T. Blazek, A. Blik, B. Bloch-Devaux, V. Bolotov, V. Bonaiuto, M. Boretto, M. Bragadireanu, D. Britton, G. Britvich, M.B. Brunetti, D. Bryman, F. Bucci, F. Butin, E. Capitolo, C. Capoccia, T. Capussela, A. Cassese, A. Catinaccio, A. Cecchetti, A. Ceccucci, P. Cenci, V. Cerny, C. Cerri, B. Checcucci, O. Chikilev, S. Chiozzi, R. Ciaranfi, G. Collazuol, A. Conovaloff, P. Cooke, P. Cooper, G. Corradi, E. Cortina Gil, F. Costantini, F. Cotorobai, A. Cotta Ramusino, D. Coward, G. D'Agostini, J. Dainton, P. Dalpiaz, H. Danielsson, J. Degrange, N. De Simone, D. Di Filippo, L. Di Lella, S. Di Lorenzo, N. Dixon, N. Doble, B. Dobrich, V. Duk, V. Elsha, J. Engelfried, T. Enik, N. Estrada, V. Falaleev, R. Fantechi, V. Fascianelli, L. Federici, S. Fedotov, M. Fiorini, J. Fry, J. Fu, A. Fucci, L. Fulton, S. Gallorini, S. Galeotti, E. Gamberini, L. Gatignon, G. Georgiev, A. Gianoli, M. Giorgi, S. Giudici, L. Glonti, A. Goncalves Martins, F. Gonnella, E. Goudzovski, R. Guida, E. Gushchin, F. Hahn, B. Hallgren, H. Heath, F. Herman, T. Husek, O. Hutanu, D. Hutchcroft, L. Iacobuzio, E. Iacopini, E. Imbergamo, O. Jamet, P. Jarron, E. Jones, T. Jones, K. Kampf, J. Kaplon, V. Kekelidze, S. Kholodenko, G. Khoriauli, A. Khotyantsev, A. Khudyakov, Yu. Kiryushin, A. Kleimenova, K. Kleinknecht, A. Kluge, M. Koval, V. Kozhuharov, M. Krivda, Z. Kucerova, Yu. Kudenko, J. Kunze, G. Lamanna, G. Latino, C. Lazzeroni, G. Lehmann-Miotto, R. Lenci, M. Lenti, E. Leonardi, P. Lichard, R. Lietava, L. Litov, R. Lollini, D. Lomidze, A. Lonardo, M. Lupi, N. Lurkin, K. McCormick, D. Madigozhin, G. Maire, C. Mandeiro, I. Mannelli, G. Mannocchi, A. Mapelli, F. Marchetto, R. Marchevski, S. Martellotti, P. Massarotti, K. Massri, P. Matak, E. Maurice, A. Mefodev, E. Menichetti, E. Minucci, M. Mirra, M. Misheva, N. Molokanova, J. Morant, M. Morel, M. Moulson, S. Movchan, D. Munday, M. Napolitano, I. Neri, F. Newson, A. Norton, M. Noy, G. Nuessle, T. Numao, V. Obraztsov, A. Ostankov, S. Padolski, R. Page, V. Palladino, G. Paoluzzi, C. Parkinson, E. Pedreschi, M. Pepe, F. Perez Gomez, M. Perrin-Terrin, L. Peruzzo, P. Petrov, F. Petrucci, R. Piandani, M. Piccini, D. Pietreanu, J. Pinzino, I. Polenkevich, L. Pontisso, Yu. Potrebenikov, D. Protopopescu, F. Raffaelli, M. Raggi, P. Riedler, A. Romano, P. Rubin, G. Ruggiero, V. Russo, V. Ryjov, A. Salamon, G. Salina, V. Samsonov, C. Santoni, G. Saracino, F. Sargeni, V. Semenov, A. Sergi, M. Serra, A. Shaikhiev, S. Shkarovskiy, I. Skillicorn, D. Soldi, A. Sotnikov, V. Sugonyaev, M. Sozzi, T. Spadaro, F. Spinella, R. Staley, A. Sturgess, P. Sutcliffe, N. Szilasi, D. Tagnani, S. Trilov, M. Valdata-Nappi, P. Valente, M. Vasile, T. Vassilieva, B. Velghe, M. Veltri, S. Venditti, P. Vicini, M. Vormstein, H. Wahl, R. Wanke, P. Wertelaers, A. Winhart, R. Winston, B. Wrona, O. Yushchenko, M. Zamkovsky, and A. Zinchenko

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, 010308 nuclear & particles physics, Physics beyond the Standard Model, NA62 experiment, 01 natural sciences, Measure (mathematics), Nuclear physics, Quality (physics), 0103 physical sciences, 010306 general physics
Abstract

Among the meson decays, K → π ν ν ‾ are the cleanest environment, from the theoretical point of view, where to search for new physics effects. The NA62 Experiment at CERN SPS aims to measure the BR ( K + → π + ν ν ‾ ) with a 10% precision by the end of 2018. It has been commissioned with technical runs in 2014 and 2015, and some preliminary results of the detector performances and quality of data are here reported.

Published
2017

36. Search for production of an invisible dark photon in (0) decays

Author

T. Numao, Paolo Valente, G. Mannocchi, Milena Misheva, M. Perrin-Terrin, Mattia Barbanera, S. Martellotti, A. Salamon, Dave Britton, B. Angelucci, L. Iacobuzio, E. B. Holzer, F. Brizioli, J. Jerhot, A. Ceccucci, F. Bucci, A. Antonelli, Andrea Bizzeti, P. Cenci, Paul Laycock, F. Hahn, E. Pedreschi, V. Kurochka, N. A. Molokanova, M. Mirra, R. Page, A. Sturgess, J. B. Dainton, P. Lubrano, Roberta Arcidiacono, D. Soldi, S. Schuchmann, E. Gushchin, K. Massri, R. Fantechi, V. Cerny, Tomáš Husek, M. Napolitano, J. Kunze, N. De Simone, S. Padolski, Vladimir Kekelidze, D. T. Madigozhin, S. Venditti, A. Shaikhiev, Evgueni Goudzovski, G. Lanfranchi, E. Maurice, L. Fulton, F. Duval, A. M. Bragadireanu, Rainer Wanke, L. Peruzzo, Cristina Biino, E. Minucci, M. Vormstein, M. Moulson, M. Lenti, P. F. Dalpiaz, R. Marchevski, H. D. Wahl, Andrea Biagioni, R. Volpe, M. Fiorini, B. Bloch-Devaux, S. Ghinescu, G. Khoriauli, E. Imbergamo, E. Menichetti, L. Di Lella, F. Newson, Tommaso Spadaro, Karol Kampf, G. D'Agostini, S. Movchan, C. Lazzeroni, E. Gamberini, Matteo Lupi, C. Cerri, Fabrizio Petrucci, G. Saracino, Y. Petrov, M. Boretto, Leander Litov, F. Ambrosino, M. Pepe, S. Trilov, V. Fascianelli, Yu.A. Kudenko, V. Sugonyaev, Z. Kucerova, S. Shkarovskiy, A. Korotkova, M. Koval, M. Sozzi, Antonino Sergi, Jacopo Pinzino, Yu. Potrebenikov, Georgi P. Georgiev, O. Hutanu, B. Wrona, B. Jenninger, V. Palladino, A. Fucci, G. Anzivino, Viacheslav Duk, Jürgen Engelfried, R. Aliberti, P. Petrov, Mauro Raggi, A. Norton, Ilaria Neri, Vincenzo Bonaiuto, T. Enik, Douglas Bryman, H. O. Danielsson, D. Coward, Sergei Fedotov, Roberto Ammendola, Vladimir Ryjov, V. Obraztsov, A. Khotyantsev, A. Mefodev, D. E. Hutchcroft, A. Mapelli, P. Rubin, O. Yushchenko, Luca Pontisso, I. Mannelli, F. Marchetto, L. Federici, Piero Vicini, S. Giudici, Mario Giorgi, D. Di Filippo, V. E. Semenov, V. Kurshetsov, Claudio Santoni, N. Estrada-Tristan, S. Kholodenko, Francesco Gonnella, G. Lehmann Miotto, J. Fu, C. Graham, P. Lichard, A. Filippi, Tomas Blazek, A. I. Zinchenko, B. Checcucci, E. Iacopini, A. Cotta Ramusino, P. Cooper, L. Gatignon, M. Corvino, L. Bician, T. Capussela, V. Falaleev, V. Kozhuharov, J. Swallow, M. Zamkovsky, A. Gianoli, Roberto Guida, D. Protopopescu, Paolo Massarotti, R. W. L. Jones, Babette Döbrich, Nicolas Lurkin, E. Lari, M. B. Brunetti, A. Romano, Fausto Sargeni, C. J. Parkinson, A. Conovaloff, Emilio Leonardi, A P Ostankov, I. Polenkevich, N. Doble, Matthew Noy, Helen F Heath, M. Medvedeva, Giuseppe Ruggiero, D. Lomidze, F. Costantini, T. Bache, M. Piccini, G. Lamanna, A. Kleimenova, Johannes Bernhard, A. Parenti, F. Spinella, R. Lollini, Ernesto Migliore, G. Latino, J. R. Fry, Alessandro Lonardo, E. Cortina Gil, Roberto Piandani, B. Velghe, J. Carmignani, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA62, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Ambrosino, F., Capussela, T., Corvino, M., Di Filippo, D., Massarotti, P., Mirra, M., Napolitano, M., Saracino, G., and UCL - SST/IRMP - Institut de recherche en mathématique et physique

Subjects
Exotics, Photon, S009:Desig=15, Beyond Standard Model, Exotics, Fixed target experiments, Rare decay, NA62 experiment, 7. Clean energy, 01 natural sciences, Dark photon, NA62, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Economica, photon: mass, photon: coupling, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], pi0: branching ratio: upper limit, +pi%2B+pi0%22">K+ --> pi+ pi0, Physics, S029HPH, photon: invisible decay, Coupling (probability), K+: hadronic decay, mass dependence, Fixed target experiment, Fixed target experiments, Production (computer science), S009.15, K+: secondary beam, beyond standard model, Particle Physics - Experiment, Exotic, rare decay, Nuclear and High Energy Physics, Particle physics, Meson, pi0: radiative decay, coupling constant: upper limit, Partícules (Física nuclear), PE2_2, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, +photon+neutrino+antineutrino%22">pi0 --> photon neutrino antineutrino, 010306 general physics, fixed target experiments, photon: hidden sector, pi0: electromagnetic decay, hep-ex, 010308 nuclear & particles physics, Branching fraction, exotics, CERN SPS, Rare decay, Orders of magnitude (time), Beyond Standard Model, lcsh:QC770-798, High Energy Physics::Experiment, Camps, Teoria quàntica de, experimental results
Abstract

The results of a search for π decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 × 10 tagged π mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass, improving on previous searches in the mass range 60–110 MeV/c. The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay π→ γνν¯ , improving the current limit by more than three orders of magnitude.

Published
2019

37. Searches for lepton number violating $K^+$ decays

Author

Tomáš Husek, D. T. Madigozhin, A. Sturgess, J. B. Dainton, Matteo Lupi, P. F. Dalpiaz, R. Marchevski, E. Gamberini, Jürgen Engelfried, T. Bache, G. Latino, Claudio Santoni, A. Filippi, A. I. Zinchenko, M. Medvedeva, J. R. Fry, E. Maurice, T. Capussela, A. Gianoli, Alessandro Lonardo, E. Cortina Gil, Roberto Piandani, Giuseppe Ruggiero, H. O. Danielsson, Roberto Guida, V. Kurochka, Luca Pontisso, M. Piccini, Yu. Potrebenikov, G. Lehmann Miotto, A. Kleimenova, Vladimir Ryjov, L. Federici, C. Graham, F. Bucci, D. Coward, B. Velghe, J. Carmignani, M. Boretto, L. Di Lella, Tommaso Spadaro, M. Vormstein, S. Schuchmann, V. Falaleev, M. Misheva, F. Costantini, N. Doble, Babette Döbrich, G. Mannocchi, G. D'Agostini, M. Pepe, A. Mapelli, B. Wrona, S. Giudici, P. Cenci, Fabrizio Petrucci, G. Saracino, O. Hutanu, C. J. Parkinson, David Hutchcroft, Emilio Leonardi, P. Rubin, Leander Litov, V. Kozhuharov, I. Polenkevich, M. Zamkovsky, A. Salamon, G. Khoriauli, Antonino Sergi, A. Romano, Fausto Sargeni, G. Anzivino, A. Mefodev, I. Mannelli, A P Ostankov, M. Koval, E. Iacopini, F. Brizioli, Roberta Arcidiacono, E. Gushchin, P. Lubrano, T. Numao, Paolo Valente, Matthew Noy, R. W. L. Jones, M. Perrin-Terrin, M. Sozzi, Helen F Heath, Ilaria Neri, Y. Petrov, F. Hahn, Johannes Bernhard, Vincenzo Bonaiuto, T. Enik, Douglas Bryman, Sergei Fedotov, M. Lenti, F. Newson, N. A. Molokanova, R. Fantechi, N. De Simone, E. Pedreschi, G. Lamanna, S. Shkarovskiy, V. Palladino, A. Parenti, F. Spinella, A. Korotkova, A. Fucci, R. Lollini, Evgueni Goudzovski, M. Napolitano, E. Minucci, Georgi P. Georgiev, Viacheslav Duk, M. Mirra, F. Marchetto, Piero Vicini, Ernesto Migliore, C. Cerri, P. Lichard, A. M. Bragadireanu, S. Trilov, Roberto Ammendola, Cristina Biino, Mauro Raggi, B. Jenninger, S. Movchan, C. Lazzeroni, F. Ambrosino, M. Moulson, V. Fascianelli, Karol Kampf, V. Sugonyaev, Mario Giorgi, D. Di Filippo, L. Gatignon, S. Padolski, M. Corvino, D. Protopopescu, L. Bician, J. Swallow, Nicolas Lurkin, M. B. Brunetti, R. Aliberti, A. Norton, Andrea Biagioni, R. Volpe, A. Conovaloff, J. Kunze, M. Fiorini, D. Lomidze, O. Yushchenko, V. Kurshetsov, S. Kholodenko, B. Checcucci, P. Cooper, Paolo Massarotti, Rainer Wanke, E. Lari, A. Shaikhiev, Francesco Gonnella, Vladimir Kekelidze, Tomas Blazek, Mattia Barbanera, A. Cotta Ramusino, Jacopo Pinzino, S. Martellotti, V. Obraztsov, B. Angelucci, L. Iacobuzio, E. B. Holzer, Dave Britton, N. Estrada-Tristan, V. E. Semenov, A. Ceccucci, R. Page, Andrea Bizzeti, J. Jerhot, P. Petrov, H. D. Wahl, V. Cerny, E. Menichetti, A. Khotyantsev, D. Soldi, K. Massri, L. Fulton, F. Duval, Yu. G. Kudenko, A. Antonelli, L. Peruzzo, J. L. Fu, B. Bloch-Devaux, E. Imbergamo, S. Venditti, Z. Kucerova, Paul Laycock, S. Ghinescu, G. Lanfranchi, Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), NA62, European Commission, Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ambrosino, F., Capussela, T., Corvino, M., Di Filippo, D., Massarotti, P., Mirra, M., Napolitano, M., Saracino, G., and UCL - SST/IRMP - Institut de recherche en mathématique et physique

Subjects
branching ratio: upper limit, K+: rare decay, NA62 experiment, 01 natural sciences, NA62, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, electron: pair production, High Energy Physics - Experiment (hep-ex), Economica, K+: branching ratio, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], K meson decay, Physics, Large Hadron Collider, Electroweak interaction, lcsh:QC1-999, muon: pair production, lepton number violation, K+: semileptonic decay, K+: secondary beam, Particle Physics - Experiment, Nuclear and High Energy Physics, Particle physics, CERN Lab, S010.46, FOS: Physical sciences, kaons, S010:Desig=46, +pi-+2muon%2B%22">K+ --> pi- 2muon+, Partícules (Física nuclear), PE2_2, Violació CP (Física nuclear), 0103 physical sciences, Kaon decays, lepton number violation, K meson, K meson decay, 010306 general physics, lepton number: violation, Kaon decays, Lepton Number Violation, hep-ex, 010308 nuclear & particles physics, S010:Desig=19, CERN SPS, K meson, Lepton number, +pi-+electron+positron%22">K+ --> pi- electron positron, Kaon Physics, Lepton Flavour Violation, S010.19, lcsh:Physics, experimental results
Abstract

The NA62 experiment at CERN reports a search for the lepton number violating decays K+ -> pi(-)e(+)e(+) and K+ -> pi(-)mu(+)mu(+) using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10(-10) and 4.2 x 10(-11) are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively., It is a pleasure to express our appreciation to the staff of the CERN laboratory and the technical staffs of the participating laboratories and universities for their efforts in the operation of the experiment and data processing. The cost of the experiment and its auxiliary systems was supported by the funding agencies of the Collaboration Institutes. We are particularly indebted to: F.R.S.-FNRS (Fonds De La Recherche Scientifique - FNRS), Belgium; BMES (Ministry of Education, Youth and Science), Bulgaria; NSERC (Natural Sciences and Engineering Research Council), Canada; NRC (National Research Council Canada) contribution to TRIUMF, Canada; MEYS (Ministry of Education, Youth and Sports), Czech Republic; BMBF (Bundesministerium für Bildung und Forschung) contracts 05H12UM5, 05H15UMCNA and 05H18UMCNA, Germany; INFN (Istituto Nazionale di Fisica Nucleare), Italy; MIUR (Ministero dell'Istruzione, dell'Università e della Ricerca), Italy; CONACyT (Consejo Nacional de Ciencia y Tecnología), Mexico; IFA (Institute of Atomic Physics), Romania; INR-RAS (Institute for Nuclear Research of the Russian Academy of Sciences), Moscow, Russia; JINR (Joint Institute for Nuclear Research), Dubna, Russia; NRC (National Research Center) “Kurchatov Institute” and MESRF (Ministry of Education and Science of the Russian Federation), Russia; MESRS (Ministry of Education, Science, Research and Sport of the Slovak Republic), Slovakia; CERN (European Organization for Nuclear Research), Switzerland; STFC (Science and Technology Facilities Council), United Kingdom; NSF (National Science Foundation) Award Number 1506088, U.S.A.; ERC (European Research Council) “UniversaLepto” advanced grant 268062, “KaonLepton” starting grant 336581, Europe. Individuals have received support from: Charles University Research Center (UNCE/SCI/013), Czech Republic; Ministry of Education, Universities and Research (MIUR “Futuro in ricerca 2012” grant RBFR12JF2Z, Project GAP), Italy; Russian Foundation for Basic Research (RFBR grants 18-32-00072, 18-32-00245), Russia; the Royal Society (grants UF100308, UF0758946), United Kingdom; STFC (Rutherford fellowships ST/J00412X/1, ST/M005798/1), United Kingdom; ERC (grants 268062, 336581 and starting grant 802836 “AxScale”).

Published
2019

38. Search for $K^+ \to \pi^+ \nu \bar{\nu}$ at NA62

Author

F. Newson, Paul Laycock, S. Shkarovskiy, J. B. Dainton, L. Iacobuzio, Emilio Leonardi, I. Polenkevich, Yu. Kudenko, M. Medvedeva, F. Costantini, A. Mefodev, I. Mannelli, G. Lanfranchi, M. Perrin-Terrin, Tommaso Spadaro, Tomáš Husek, A. Salamon, D. T. Madigozhin, F. Brizioli, S. Movchan, C. Lazzeroni, F. Ambrosino, K. Massri, M. Lenti, Matteo Lupi, E. Cortina Gil, Roberto Piandani, G. Khoriauli, Paolo Valente, L. Bician, Luca Federici, J. Swallow, G. Saracino, Georgi P. Georgiev, J. R. Fry, Viacheslav Duk, C. Cerri, Dave Britton, N. Estrada-Tristan, Claudio Santoni, A. Filippi, S. Trilov, Roberto Ammendola, E. Imbergamo, A. Ceccucci, B. Checcucci, T. Capussela, Andrea Bizzeti, A. Gianoli, Christopher John Parkinson, M. Sozzi, Angelo Biagioni, J. L. Fu, N. Doble, D. Protopopescu, J. Pinzino, F. Spinella, Ilaria Neri, Vincenzo Bonaiuto, Vladimir Kekelidze, G. Anzivino, R. Lollini, Emilie Maurice, A. Conovaloff, Nicolas Lurkin, M. B. Brunetti, T. Enik, Douglas Bryman, Sergei Fedotov, E. Gamberini, R. Aliberti, H. D. Wahl, A. Norton, H. O. Danielsson, A. Sturgess, Ernesto Migliore, Vladimir Ryjov, D. Coward, V. Sougonyaev, A. Mapelli, Luca Pontisso, S. Giudici, P. Lubrano, P. S. Cooper, B. Angelucci, R. D. page, Alessandro Lonardo, G. Lamanna, M. Koval, S. Venditti, A. Shaikhiev, Yu. Potrebenikov, Giuseppe Latino, Francesco Gonnella, V. Kurochka, R. Guida, P. F. Dalpiaz, Tomas Blazek, M. Fiorini, L. Di Lella, V. Kozhuharov, J. Kunze, M. Zamkovsky, Cristina Biino, A. Cotta Ramusino, S. Ghinescu, Jürgen Engelfried, M. Bragadireanu, T. Numao, D. E. Hutchcroft, S. Padolski, A. Korotkova, N. A. Molokanova, O. Yushchenko, M. Napolitano, N. De Simone, V. Kurshetsov, Mauro Piccini, Fabrizio Petrucci, V. Falaleev, S. Martellotti, Leander Litov, A. Kleimenova, S. Kholodenko, B. Wrona, Paolo Massarotti, P. Petrov, M. Pepe, Mattia Barbanera, A. Fucci, M. Noy, A. Khotyantsev, M. Moulson, Karol Kampf, V. Cerny, Rainer Wanke, E. Menichetti, P. Rubin, L. Gatignon, M. Corvino, V. Obraztsov, V. E. Semenov, Evgueni Goudzovski, B. Velghe, B. Jenninger, Mario Giorgi, D. Di Filippo, G. Mannocchi, F. Hahn, R. Marchevski, Antonino Sergi, E. Minucci, D. Soldi, A.I. Zinchenko, V. Fascianelli, G. D'Agostini, G. Lehmann Miotto, C. Graham, Babette Döbrich, O. Hutanu, V. Palladino, F. Marchetto, Piero Vicini, P. Lichard, E. Iacopini, L. Fulton, F. Duval, David Lomidze, E. Pedreschi, M. Mirra, G. Ruggiero, M. Boretto, A. Romano, Fausto Sargeni, M. Vormstein, P. Cenci, A P Ostankov, R. Volpe, Roberta Arcidiacono, F. Bucci, E. Gushchin, Milena Misheva, R. Fantechi, A. Antonelli, L. Peruzzo, B. Bloch-Devaux, Mauro Raggi, Helen F Heath, and Z. Kucerova

Subjects
Physics, Particle physics, Branching fraction, Physics beyond the Standard Model, Pi, Nuclear Physics - Experiment, Sensitivity (control systems), Atomic physics, NA62 experiment, Measure (mathematics), Particle Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Bar (unit)
Abstract

The decay $K^{+} \rightarrow \pi^{+}\nu\overline{\nu}$ has a very precisely predicted branching ratio ($\sim 8\times 10^{-11}$) and it is one of the best candidates to reveal indirect effects of new physics. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the $K^{+} \rightarrow \pi^{+}\nu\overline{\nu}$ with a decay-in-flight technique, novel for this channel. NA62 has taken data firstly in 2016 with the aim to reach the SM sensitivity. It has then collected 10 times more statistics in 2017 and a similar amount of data is expected from the 2018 run. The preliminary result on the full 2016 data set and the prospects for future developments are presented here.

Published
2018

39. Changes in soil organic carbon fractions in response to sugarcane planting in the central-south region of Brazil

Author

C. C. Cerri, A. M. Silva-Olaya, and C. E. P. Cerri

Subjects
geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Soil test, Soil organic matter, Sowing, 04 agricultural and veterinary sciences, Fractionation, Soil carbon, Vegetation, Dispersion (geology), 01 natural sciences, Pasture, SOLOS, Agronomy, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, General Agricultural and Biological Sciences, 0105 earth and related environmental sciences
Abstract

Sugarcane planting area in Brazil has considerably increased during recent years by occupying areas used for pasture and grain crops production. Land use change (LUC) processes related to sugarcane expansion can affect the soil organic carbon (SOC) stocks, and the quality of the soil organic matter. Preliminary studies have shown that the land-use transition into sugarcane leadto a decrease in the SOC, however no studies have accessed the impact of LUC on the SOC distribution within soil particle-size classes. The study investigated the modifications on total SOC, particulate organic carbon (POM) and mineral-associated C (MOC) in response to conversion from native vegetation (NV), pastures and annual cropland (AC) to sugarcane crop (SCN). Soil samples were collected at 34 field-sites to 20 cm depth and POM fraction separated through 53-mm sieve after soil dispersion. The study results indicated that LUC affects both the labile as well as the more stable SOM fraction, with a mean C content decreasing of 40 and 30% in POM and MOC respectively, following the transition from NV to SCN. The replacement of pastures caused C depletion by 33% at POM and 30% at MOC; meanwhile C accumulation at MOC (5%) was detected for the conversion from AC to SCN. The impact of LUC on POM for AC-SCN transition could not be totally clarified, however the result could be an indication that the POM response to LUC varies as function of previous management in AC. Key words: Soil organic carbon, C fractionation, particulate organic matter, mineral-associated C, land use change.

Published
2016

40. Search for heavy neutral lepton production in K+ decays

Author

K. Massri, L. Di Lella, M. Misheva, M. Perrin-Terrin, V. Sugonyaev, H. O. Danielsson, L. Peruzzo, S. Giudici, B. Bloch-Devaux, L. Bician, Luca Federici, J. Swallow, B. Wrona, E. Imbergamo, G. D'Agostini, M. Pepe, Luca Pontisso, R. Aliberti, J. R. Fry, V. Palladino, Francesco Gonnella, G. Saracino, O. Hutanu, F. Bucci, A. Norton, Tomas Blazek, A. Fucci, A. Cotta Ramusino, M. Boretto, A. Conovaloff, Z. Kucerova, D. Soldi, G. Mannocchi, P. Cenci, Piero Vicini, Vladimir Ryjov, I. Mannelli, A. Mefodev, Alessandro Lonardo, P. Lichard, S. Movchan, L. Gatignon, A. Mapelli, J. Kunze, F. Ambrosino, T. Numao, Paolo Valente, L. Fulton, F. Duval, F. Hahn, Paul Laycock, V. Kekelidze, E. Cortina Gil, A. Salamon, G. Khoriauli, A. Korotkova, M. Koval, M. Corvino, Jürgen Engelfried, Roberto Piandani, D. Coward, Dave Britton, N. Estrada-Tristan, G. Anzivino, Leander Litov, F. Brizioli, A. Kleimenova, A. Romano, Fausto Sargeni, M. Sozzi, D. Lomidze, Yu. G. Kudenko, Evgueni Goudzovski, S. Padolski, A P Ostankov, Matthew Noy, R. Fantechi, Ilaria Neri, P. Petrov, O. Yushchenko, Cristina Biino, Vincenzo Bonaiuto, Andrea Bizzeti, T. Enik, Douglas Bryman, Sergei Fedotov, Cristina Lazzeroni, D. Protopopescu, Nicolas Lurkin, M. B. Brunetti, A. Khotyantsev, B. Velghe, Mattia Barbanera, V. Kurochka, B. Jenninger, A. Antonelli, V. Kurshetsov, G. Lanfranchi, A. Zinchenko, S. Kholodenko, M. Vormstein, R. Wanke, P. F. Dalpiaz, Mario Giorgi, D. Di Filippo, B. Checcucci, V. Cerny, G. Latino, P. Cooper, Andrea Biagioni, R. Volpe, G. Lamanna, E. Gamberini, D. Madigozhin, Georgi P. Georgiev, Viacheslav Duk, E. Menichetti, V. Kozhuharov, M. Fiorini, S. Martellotti, M. Zamkovsky, A. Filippi, Roberto Ammendola, P. Lubrano, B. Angelucci, F. Spinella, R. Lollini, T. Spadaro, Ernesto Migliore, H. D. Wahl, M. Piccini, N. Doble, David Hutchcroft, S. Trilov, R. Page, E. Maurice, Helen F Heath, V. Obraztsov, A. Sturgess, N. De Simone, C. Cerri, V. E. Semenov, A. M. Bragadireanu, P. Rubin, Paolo Massarotti, M. Moulson, F. Marchetto, Karol Kampf, N. A. Molokanova, M. Napolitano, J. Pinzino, E. Iacopini, Mauro Raggi, J. L. Fu, S. Venditti, A. Shaikhiev, S. Ghinescu, Claudio Santoni, T. Capussela, A. Gianoli, Roberto Guida, F. Petrucci, Tomáš Husek, Yu. Potrebenikov, Matteo Lupi, R. Marchevski, Antonino Sergi, G. Lehmann Miotto, C. Graham, V. Falaleev, M. Lenti, Babette Döbrich, F. Newson, C. J. Parkinson, S. Shkarovskiy, E. Minucci, J. B. Dainton, V. Fascianelli, L. Iacobuzio, Emilio Leonardi, I. Polenkevich, M. Medvedeva, Roberta Arcidiacono, E. Gushchin, Giuseppe Ruggiero, A. Ceccucci, E. Pedreschi, M. Mirra, F. Costantini, Cortina Gil, E., Minucci, E., Padolski, S., Petrov, P., Velghe, B., Georgiev, G., Kozhuharov, V., Litov, L., Numao, T., Bryman, D., Fu, J., Husek, T., Kampf, K., Zamkovsky, M., Aliberti, R., Khoriauli, G., Kunze, J., Lomidze, D., Marchevski, R., Peruzzo, L., Vormstein, M., Wanke, R., Dalpiaz, P., Fiorini, M., Gamberini, E., Neri, I., Norton, A., Petrucci, F., Wahl, H., Cotta Ramusino, A., Gianoli, A., Iacopini, E., Latino, G., Lenti, M., Bizzeti, A., Bucci, F., Volpe, R., Antonelli, A., Gonnella, F., Lamanna, G., Lanfranchi, G., Mannocchi, G., Martellotti, S., Moulson, M., Raggi, M., Spadaro, T., Ambrosino, F., Capussela, T., Corvino, Michele, Di Filippo, D., Massarotti, P., Mirra, M., Napolitano, M., Saracino, G., Anzivino, G., Brizioli, F., Imbergamo, E., Lollini, R., Santoni, C., Barbanera, M., Cenci, P., Checcucci, B., Duk, V., Lubrano, P., Lupi, M., Pepe, M., Piccini, M., Costantini, F., Di Lella, L., Doble, N., Giorgi, M., Giudici, S., Pedreschi, E., Sozzi, M., Cerri, C., Fantechi, R., Piandani, R., Pinzino, J., Pontisso, L., Spinella, F., Mannelli, I., D'Agostini, G., Biagioni, A., Leonardi, E., Lonardo, A., Valente, P., Vicini, P., Ammendola, R., Bonaiuto, V., De Simone, N., Federici, L., Fucci, A., Salamon, A., Sargeni, F., Arcidiacono, R., Bloch-Devaux, B., Boretto, M., Iacobuzio, L., Menichetti, E., Migliore, E., Soldi, D., Biino, C., Filippi, A., Marchetto, F., Engelfried, J., Estrada-Tristan, N., Bragadireanu, A. M., Ghinescu, S. A., Hutanu, O. E., Enik, T., Falaleev, V., Kekelidze, V., Korotkova, A., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Polenkevich, I., Potrebenikov, Yu., Shkarovskiy, S., Zinchenko, A., Fedotov, S., Gushchin, E., Khotyantsev, A., Kleimenova, A., Kudenko, Y., Kurochka, V., Medvedeva, M., Mefodev, A., Shaikhiev, A., Kholodenko, S., Kurshetsov, V., Obraztsov, V., Ostankov, A., Semenov, V., Sugonyaev, V., Yushchenko, O., Bician, L., Blazek, T., Cerny, V., Koval, M., Kucerova, Z., Ceccucci, A., Danielsson, H., Duval, F., Döbrich, B., Gatignon, L., Guida, R., Hahn, F., Jenninger, B., Laycock, P., Lehmann Miotto, G., Lichard, P., Mapelli, A., Noy, M., Palladino, V., Perrin-Terrin, M., Ruggiero, G., Ryjov, V., Venditti, S., Brunetti, M. B., Fascianelli, V., Goudzovski, E., Lazzeroni, C., Lurkin, N., Newson, F., Parkinson, C., Romano, A., Sergi, A., Sturgess, A., Swallow, J., Heath, H., Page, R., Trilov, S., Angelucci, B., Britton, D., Graham, C., Protopopescu, D., Dainton, J. B., Fry, J. R., Fulton, L., Hutchcroft, D., Massri, K., Maurice, E., Wrona, B., Conovaloff, A., Cooper, P., Coward, D., and Rubin, P.

Subjects
Nuclear and High Energy Physics, lepton, Pontecorvo–Maki–Nakagawa–Sakata matrix, heavy neutral leptons, neutrino mixing, FOS: Physical sciences, k meson, NA62 experiment, 01 natural sciences, neutrino mixing, Settore FIS/04 - Fisica Nucleare e Subnucleare, decay, High Energy Physics - Experiment, Nuclear physics, neutrino, High Energy Physics - Experiment (hep-ex), Minimum bias, Economica, Bounds, neutrinos, masses, tests, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, heavy neutral leptons, lepton, k meson, decay, neutrino, 010306 general physics, Nuclear Experiment, Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, Ambientale, lcsh:QC1-999, High Energy Physics::Experiment, lcsh:Physics, Particle Physics - Experiment, Lepton
Abstract

A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the $10^{-7}$ to $10^{-6}$ level are established on the elements of the extended neutrino mixing matrix $|U_{\ell 4}|^2$ ($\ell=e,\mu$) for heavy neutral lepton mass in the range $170-448~{\rm MeV}/c^2$. This improves on the results from previous production searches in $K^+$ decays, setting more stringent limits and extending the mass range., Comment: Version accepted for publication in Phys.Lett.B (12/01/2018)

Published
2018

41. Measurement of the form factors of charged kaon semileptonic decays

Author

V. Kozhuharov, P. Cenci, M. Valdata-Nappi, S. Venditti, M. Shieh, Jacqueline Batley, C. Cerri, G. Collazuol, Manfred Jeitler, J. Derre, N. Doble, U. Moosbrugger, S. Giudici, Roberta Arcidiacono, M. De Beer, Maulik R. Patel, M. Wache, M. Behler, Cristina Lazzeroni, Giuseppe Ruggiero, Rainer Wanke, Augusto Ceccucci, G. Bocquet, Yu. Potrebenikov, Nicola Cabibbo, B. Vallage, M. Slater, C. Cheshkov, A. A. Maier, G. Kalmus, D. T. Madigozhin, S. Goy Lopez, M. Savrie, B. Bloch-Devaux, A. Peters, Lau Gatignon, V. Falaleev, P. L. Frabetti, P. Rubin, E. Imbergamo, E. Mazzucato, A. Norton, Enrico Celeghini, G.M. Pierazzini, Cristina Biino, Ivan Mikulec, F. Costantini, B. Renk, D. Coward, M. Scarpa, Andrea Bizzeti, A. Winhart, M. Szleper, C. Morales Morales, P. F. Dalpiaz, Nicolo Cartiglia, E. C. Swallow, M. D. Wood, M. Veltri, M. Holder, H. Wahl, M. C. Petrucci, Evgueni Goudzovski, E. Iacopini, A. Michetti, Mayda Velasco, I. Polenkevich, M. Ziolkowski, Massimiliano Fiorini, M. Sozzi, M. Fidecaro, A. Nappi, Peter Zahariev Hristov, P. Marouelli, A. I. Zinchenko, C. Damiani, Evelina Gersabeck, Simone Bifani, S. A. Wotton, B. Peyaud, R. Fantechi, Vladimir Kekelidze, L. DiLella, K. Kleinknecht, Anne Dabrowski, A. Gianoli, Leander Litov, W. Baldini, G. Marel, S. Shkarovskiy, M. Markytan, M. Lenti, G. Lamanna, I. Mannelli, Marco Clemencic, Milene Calvetti, R. Winston, M. Pepe, Stoyan Stoynev, A. Gonidec, Giuseppina Anzivino, W. Kubischta, Alan W. Walker, L. Masetti, M. Hita-Hochgesand, E. Monnier, H. Dibon, T. Fonseca Martin, D. J. Munday, Mauro Piccini, S. Balev, N. A. Molokanova, M. Martini, K. Eppard, Mauro Raggi, F. Marchetto, L. Widhalm, A. Cotta Ramusino, G. Neuhofer, D.C. Cundy, F. Petrucci, J.B. Cheze, Luca Fiorini, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and NA48/2

Subjects
Nuclear Theory, S010LQM, S010MSM, Fixed target experiments, Rare decay, K meson, 01 natural sciences, S010LMM, Physics, Particles & Fields, High Energy Physics - Experiment, Economica, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], S010LAM, Nuclear Experiment, Physics, Quantum chromodynamics, form factor, 02 Physical Sciences, Form factor (quantum field theory), semileptonic decay, Kaon, Nuclear & Particles Physics, Fixed target experiments Rare decay, 3. Good health, Rare decay, Nuclear and High Energy Physics, Physical Sciences, Particle Physics - Experiment, Semileptonic decay, Particle physics, S010LPE, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, S010MVM, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, K: semileptonic decay, 010306 general physics, 01 Mathematical Sciences, S010MVE, S010LLM, Science & Technology, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, Ambientale, K meson, S010LPM, S010LQE, NA48, lcsh:QC770-798, High Energy Physics::Experiment, S010L0
Abstract

A measurement of the form factors of charged kaon semileptonic decays is presented, based on $4.4 \times 10^6$ $K^\pm \to \pi^0 e^\pm \nu_e$ ($K^\pm_{e3}$) and $2.3 \times 10^6$ $K^\pm \to \pi^0 \mu^\pm \nu_{\mu}$ ($K^\pm_{\mu3}$) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. The combination of measurements in the $K^\pm_{e3}$ and $K^\pm_{\mu3}$ modes is also presented., Comment: 20 pages , 9 figures, 5 tables

Published
2018

42. Kl3 form factors with NA48/2 and NA62 status

Author

L. Iacobuzio, M. Sozzi, Emilio Leonardi, I. Polenkevich, L. Di Lella, Yu. Kudenko, Ilaria Neri, Vincenzo Bonaiuto, R. Page, E. Iacopini, T. Enik, Douglas Bryman, Sergei Fedotov, E. Minucci, G. Saracino, A.I. Zinchenko, K. Massri, V. Fascianelli, S. Padolski, O. Yushchenko, B. Wrona, D. Soldi, V. Kozhuharov, A. Mefodev, J. Kunze, Alessandro Lonardo, M. Zamkovsky, F. Spinella, S. Martellotti, R. Lollini, P. F. Dalpiaz, I. Mannelli, V. Obraztsov, M. Medvedeva, Ernesto Migliore, G. Anzivino, A. Conovalo, N. A. Molokanova, L. Bician, Luca Federici, J. Swallow, Claudio Santoni, A. Filippi, R. Fantechi, J. R. Fry, V. E. Semenov, T. Capussela, L. Fulton, F. Duval, David Lomidze, Mauro Piccini, V. Kurshetsov, S. Kholodenko, D. Coward, Jürgen Engelfried, V. Kurochka, R. Guida, Paul Laycock, Cristina Biino, Paolo Massarotti, M. Noy, A. Gianoli, F. Costantini, P. Petrov, Helen F Heath, M. Lenti, G. D'Agostini, H. O. Danielsson, M. Napolitano, Vladimir Ryjov, Mattia Barbanera, Evgueni Goudzovski, A. Salamon, M. Pepe, A. Mapelli, F. Bucci, Milena Misheva, Angelo Biagioni, Roberta Arcidiacono, Luca Pontisso, M. Perrin-Terrin, Tommaso Spadaro, S. Movchan, C. Lazzeroni, F. Ambrosino, Mauro Raggi, S. Giudici, F. Brizioli, O. Hutanu, G. Ruggiero, B. Angelucci, M. Koval, S. Venditti, G. Lanfranchi, J. Pinzino, E. Gushchin, E. Cortina Gil, Vladimir Kekelidze, N. De Simone, A. Shaikhiev, Francesco Gonnella, Yu. Potrebenikov, G. Lamanna, A. Romano, Fausto Sargeni, Roberto Piandani, P. S. Cooper, V. Cerny, Tomas Blazek, Giuseppe Latino, F. Newson, A. Fucci, A P Ostankov, A. Cotta Ramusino, M. Fiorini, A. Antonelli, R. Volpe, M. Boretto, G. Khoriauli, Georgi P. Georgiev, T. Numao, Viacheslav Duk, Tomáš Husek, S. Shkarovskiy, E. Menichetti, B. Velghe, L. Peruzzo, Rainer Wanke, P. Rubin, B. Bloch-Devaux, Roberto Ammendola, A. Sturgess, G. Mannocchi, D. T. Madigozhin, M. Moulson, M. Vormstein, P. Cenci, F. Marchetto, Piero Vicini, S. Ghinescu, H. D. Wahl, J. B. Dainton, David Hutchcroft, P. Lubrano, P. Lichard, F. Hahn, E. Pedreschi, Christopher John Parkinson, Matteo Lupi, B. Jenninger, A. Khotyantsev, Karol Kampf, Z. Kucerova, M. Mirra, R. Aliberti, A. Norton, J. L. Fu, Fabrizio Petrucci, Mario Giorgi, Paolo Valente, D. Di Filippo, E. Imbergamo, L. Gatignon, Leander Litov, M. Corvino, Dave Britton, N. Estrada-Tristan, A. Kleimenova, A. Ceccucci, B. Checcucci, Andrea Bizzeti, R. Piandani, M. Bragadireanu, D. Protopopescu, A. Korotkova, Emilie Maurice, Nicolas Lurkin, M. B. Brunetti, V. Sougonyaev, V. Falaleev, E. Gamberini, R. Marchevski, Antonino Sergi, G. Lehmann Miotto, C. Graham, Babette Döbrich, V. Palladino, C. Cerri, S. Trilov, N. Doble, Piandani, Roberto, Aliberti, R., Ambrosino, F., Ammendola, R., Angelucci, B., Antonelli, A., Anzivino, G., Arcidiacono, R., Barbanera, M., Biagioni, A., Bician, L., Biino, C., Bizzeti, A., Blazek, T., Bloch-Devaux, B., Bonaiuto, V., Boretto, M., Bragadireanu, M., Britton, D., Brizioli, F., Brunetti, M. B., Bryman, D., Bucci, F., Capussela, T., Ceccucci, A., Cenci, P., Cerny, V., Cerri, C., Checcucci, B., Conovalo, A., Cooper, P., Gil, E. Cortina, Corvino, M., Costantini, F., Ramusino, A. Cotta, Coward, D., D'Agostini, G., Dainton, J., Dalpiaz, P., Danielsson, H., De Simone, N., Di Filippo, D., Di Lella, L., Doble, N., Dobrich, B., Duval, F., Duk, V., Engelfried, J., Enik, T., Estrada-Tristan, N., Falaleev, V., Fantechi, R., Fascianelli, V., Federici, L., Fedotov, S., Filippi, A., Fiorini, M., Fry, J., Fu, J., Fucci, A., Fulton, L., Gamberini, E., Gatignon, L., Georgiev, G., Ghinescu, S., Gianoli, A., Giorgi, M., Giudici, S., Gonnella, F., Goudzovski, E., Graham, C., Guida, R., Gushchin, E., Hahn, F., Heath, H., Husek, T., Hutanu, O., Hutchcroft, D., Iacobuzio, L., Iacopini, E., Imbergamo, E., Jenninger, B., Kampf, K., Kekelidze, V., Kholodenko, S., Khoriauli, G., Khotyantsev, A., Kleimenova, A., Korotkova, A., Koval, M., Kozhuharov, V., Kucerova, Z., Kudenko, Y., Kunze, J., Kurochka, V., Kurshetsov, V., Lanfranchi, G., Lamanna, G., Latino, G., Laycock, P., Lazzeroni, C., Lenti, M., Miotto, G. Lehmann, Leonardi, E., Lichard, P., Litov, L., Lollini, R., Lomidze, D., Lonardo, A., Lubrano, P., Lupi, M., Lurkin, N., Madigozhin, D., Mannelli, I., Mannocchi, G., Mapelli, A., Marchetto, F., Marchevski, R., Martellotti, S., Massarotti, P., Massri, K., Maurice, E., Medvedeva, M., Mefodev, A., Menichetti, E., Migliore, E., Minucci, E., Mirra, M., Misheva, M., Molokanova, N., Moulson, M., Movchan, S., Napolitano, M., Neri, I., Newson, F., Norton, A., Noy, M., Numao, T., Obraztsov, V., Ostankov, A., Padolski, S., Page, R., Palladino, V., Parkinson, C., Pedreschi, E., Pepe, M., Perrin-Terrin, M., Peruzzo, L., Petrov, P., Petrucci, F., Piandani, R., Piccini, M., Pinzino, J., Polenkevich, I., Pontisso, L., Potrebenikov, Yu., Protopopescu, D., Raggi, M., Romano, A., Rubin, P., Ruggiero, G., Ryjov, V., Salamon, A., Santoni, C., Saracino, G., Sargeni, F., Semenov, V., Sergi, A., Shaikhiev, A., Shkarovskiy, S., Soldi, D., Sougonyaev, V., Sozzi, M., Spadaro, T., Spinella, F., Sturgess, A., Swallow, J., Trilov, S., Valente, P., Velghe, B., Venditti, S., Vicini, P., Volpe, R., Vormstein, M., Wahl, H., Wanke, R., Wrona, B., Yushchenko, O., Zamkovsky, M., and Zinchenko, A.

Subjects
Physics and Astronomy (all), General Physics and Astronomy, Settore FIS/04 - Fisica Nucleare e Subnucleare
Abstract

The NA48/2 experiment at CERN collected a very large sample of charged kaon decays into multiple final states. These data allow measurements related to QCD. We obtained our final measurement of the charged kaon semileptonic decays form factors based on 4.28 million Ke3 and 2.91 million Kμ3 selected decays, with the smallest uncertainty for Ke3 and a competitive result for Kμ3 and leading to the most precise combined Kl3 result coming from the kaon sector that reduces the form factor uncertainty of/Vus/. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the K+ → π+νν decay with 10% precision. K → πνν is one of the theoretically cleanest meson decay where to look for indirect effects of new physics complementary to LHC searches. NA62 took data in 2015-2017; the analysis of a partial data set allows to reach the Standard Model sensitivity. The status of the experiments will be presented.

Published
2018

43. Recent QCD results from the NA48/2 experiment

Author

Andreas Alexander Maier, M. Holder, G. Lamanna, G. Bocquet, Yu. Potrebenikov, Emmanuel Monnier, Augusto Ceccucci, Jacqueline Batley, M. Veltri, Cvetan Valeriev Cheshkov, A. I. Zinchenko, M. Vallage, C. Cerri, S. Venditti, G. Collazuol, P. F. Dalpiaz, A. Gianoli, G. Pierazzini, C. Morales Morales, I. Polenkevich, M. D. Wood, Milene Calvetti, Michal Szleper, Nicolo Cartiglia, Nicola Cabibbo, F. Petrucci, Enrico Celeghini, A. Cotta Ramusino, I. Mannelli, H. Dibon, F. Marchetto, M. Savrie, B. Bloch-Devaux, M. Wache, D. T. Madigozhin, M. Sozzi, Cristina Biino, Ivan Mikulec, L. Widhalm, S. A. Wotton, L. DiLella, M. Ziolkowski, Evgueni Goudzovski, S. Balev, M. Martini, Cristina Lazzeroni, M. C. Petrucci, Mark Slater, M. Patel, Mauro Raggi, E. Mazzucato, E. M. Gersabeck, Massimiliano Fiorini, N. Doble, R. Winston, Giuseppe Ruggiero, E. Imbergamo, L. Masetti, V. Kozhuharov, Peter Zahariev Hristov, M. Misheva, M. Valdata-Nappi, Mauro Piccini, Leander Litov, Simone Bifani, K. Kleinknecht, M. Scarpa, A. Peters, Manfred Jeitler, R. Fantechi, Vladimir Kekelidze, F. Costantini, U. Moosbrugger, P. Rubin, Stoyan Stoynev, B. Renk, D. Coward, H. Wahl, W. Kubischta, P.L. Frabetti, D. J. Munday, G. Anzivino, Mayda Velasco, M. De Beer, Anne Dabrowski, S. Shkarovskiy, T. Fonseca Martin, Andrea Bizzeti, G. Marel, E. Iacopini, G. Neuhofer, Rainer Wanke, Marco Clemencic, M. Fidecaro, C. Damiani, M. Pepe, B. Peyaud, M. Markytan, A. Winhart, M. Lenti, M. Behler, A. Gonidec, Alan W. Walker, E. C. Swallow, N. A. Molokanova, K. Eppard, A. Michetti, V. Falaleev, G.E. Kalmus, A. Nappi, S. Goy Lopez, A. Norton, P. Marouelli, W. Baldini, D. Cundy, J.B. Cheze, Luca Fiorini, P. Cenci, M. Shieh, Lau Gatignon, M. Hita-Hochgesand, J. Derre, Roberta Arcidiacono, R. Marchevski, Giuseppina Anzivino, and S. Giudici

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, 01 natural sciences, Pion, form factors, rare kaon decays, 0103 physical sciences, chiral perturbation theory, CP violation, High Energy Physics::Experiment, 010306 general physics
Abstract

The NA48/2 experiment collected data in 2003 and 2004 with the main purpose to study direct CP violation in charged kaons decaying in three pions. Thanks to the huge statistics collected, other studies are also possible. In this paper two recent results, in the framework of QCD studies, are reported: the measurement of the K ± → π 0 e ± ν Form Factors and the first observation of the rare decay K ± → π ± π 0 e + e − .

Published
2018

44. $K\to\pi\nu\nu$ at NA62

Author

G. Anzivino, J. Morant, N. Estrada, N Desimone, G. Paoluzzi, C. Capoccia, Kekelidze, P. Wertelaers, Semenov, P. Sutcliffe, E. Iacopini, M. Lenti, F. Marchetto, Piero Vicini, T Jones KKampf, Christopher John Parkinson, M. Veltri, G. Corradi, Cerny, D. Pietreanu, Pierre Jarron, A An tonelli, P. Lichard, M. Fiorini, Marian Krivda, F. Bucci, T. Numao, D. Tagnani, Milena Misheva, R. Fantechi, Evgueni Goudzovski, Yu. Kiryushin, H. D. Wahl, G. Maire, R. Aliberti, A. Norton, Roland Winston, P. Petrov, Petra Riedler, N. Doble, D. Soldi, E. Cortina Gil, B. Velghe, Roberto Piandani, S. Chiozzi, F. Cotorobai, Mauro Raggi, I. O. Skillicorn, L. Fulton, A. Mapelli, David Lomidze, L. Di Lella, L. Bician, Luca Federici, G. D'Agostini, F. Perez Gomez, Likhacheva, E. Capitolo, Mauro Piccini, J. Degrange, Elsha, J. Kaplon, M. Pepe, Paolo Massarotti, R. Page, S. Giudici, Mario Giorgi, Rainer Wanke, D. Di Filippo, A. Sturgess, B. Wrona, A. Fucci, P. Rubin, L. Peruzzo, R. Guida, G. Salina, Andrea Catinaccio, G. Mannocchi, O. Hutanu, A. Goncalves Martins, Georgi P. Georgiev, A. Winhart, Bonaiuto, Z. Kucerova, A. Conovaloff, S. Balev, A. Khudyakov, M. Boretto, Paolo Valente, F. Hahn, A Khotyant sev, Dave Britton, F. Newson, A. Ceccucci, B. Checcucci, Andrea Bizzeti, Roberto Ammendola, S. Shkarovskiy, M. Zamkovsky, J. Kunze, Roberto Ciaranfi, J. B. Dainton, Helen F Heath, J. R. Fry, J. L. Fu, M Valdata Nappi, M. Vormstein, P. Cenci, I. Azhinenko, N. A. Molokanova, G. Ruggiero, J. Noël, M. Koval, S. Venditti, A. Shaikhiev, R. Lenci, Samsonov, A. Salamon, Mattia Barbanera, G. Khoriauli, H. O. Danielsson, A. Romano, Fausto Sargeni, M. Serra, F. Herman, G. Collazuol, M. Napolitano, S. Gallorini, M. Medvedeva, J. Calvo, A P Ostankov, M. Vasile, G. Lamanna, S. Ghinescu, R. Volpe, M. Bragadireanu, P. S. Cooper, J. Pinzino, D. J. Munday, T. Vassilieva, F. Costantini, Mb Brunetti, Fabrizio Petrucci, Luca Pontisso, Francesco Gonnella, Tomas Blazek, A. Cotta Ramusino, D. E. Hutchcroft, Leander Litov, S. Padolski, L. Iacobuzio, O. Yushchenko, Konrad Kleinknecht, Emilio Leonardi, I. Polenkevich, A. Kleimenova, S. Kholodenko, A. Sotnikov, D. Coward, Palladino, G. Britvich, Yu. Kudenko, P.A. Cooke, S. Galeotti, Claudio Santoni, Sugonyaev, B. Angelucci, Alexander Kluge, B. Hallgren, A. Cecchetti, F. Spinella, R. Lollini, Ernesto Migliore, A. Filippi, Roberta Arcidiacono, E. Gushchin, Fascianelli, M. Moulson, Kozhuharov, B Bloch Devaux, M. Sozzi, E. Pedreschi, E. Jones, M. Mirra, L. Glonti, Ilaria Neri, T. Enik, Douglas Bryman, Sergei Fedotov, Alessandro Lonardo, K. J. McCormick, Cristina Biino, J. Bendotti, A. Gianoli, Angelo Biagioni, F. Butin, O. Chikilev, P. F. Dalpiaz, N. Szilasi, Jürgen Engelfried, N. Dixon, Tomáš Husek, R.J. Staley, E. Imbergamo, Bolotov, Russo, T Capus sela, D. T. Madigozhin, Duk, Antonio Cassese, C. Cerri, Matteo Lupi, S. Martellotti, S. Trilov, Yu. Potrebenikov, C. Mandeiro, Giuseppe Latino, A. Blik, E. Gamberini, F. Raffaelli, M. Noy, G. Lehmann Miotto, Babette Döbrich, Obraztsov, L. Gatignon, Tommaso Spadaro, S. Di Lorenzo, R. Lietava, E. Minucci, A.I. Zinchenko, R. Marchevski, Antonino Sergi, M Perrin Terrin, G. Aglieri Rinella, A. Mefodev, I. Mannelli, S. Movchan, C. Lazzeroni, F. Ambrosino, K. Massri, Falaleev, D. Protopopescu, Emilie Maurice, Nicolas Lurkin, Ryjov, G. Nuessle, O. Jamet, M. Morel, E. Menichetti, P. Matak, and G. Saracino

Subjects
Physics, Particle physics, Pi
Published
2017

45. Search for heavy neutrinos in K + → μ + ν μ decays

Author

P. Rubin, Konrad Kleinknecht, E. Iacopini, P. F. Dalpiaz, A. I. Zinchenko, Fabrizio Petrucci, D. Coward, A. Salamon, G.M. Pierazzini, Leander Litov, H. D. Wahl, M. Serra, A. Gianoli, Evgueni Goudzovski, A. Fucci, S. Gallorini, Jürgen Engelfried, V. Bolotov, B. Hallgren, M. Fiorini, B. Peyaud, Petra Riedler, M. Lenti, Viacheslav Duk, E. Imbergamo, A. Peters, V K Semenov, A. Winhart, I. Mannelli, Mauro Piccini, D. Di Filippo, R. Fantechi, Simone Bifani, M. Savrie, V. Palladino, Rainer Wanke, N. A. Molokanova, Roberto Piandani, K. Eppard, Paolo Massarotti, C. Cerri, B. Bloch-Devaux, V. Kozhuharov, S. Venditti, H. O. Danielsson, L. Di Lella, M. Napolitano, M. Misheva, D. T. Madigozhin, Nicolas Lurkin, P. L. Frabetti, N. Doble, S. Balev, Vladimir Kekelidze, G. Lamanna, M. Moulson, S. Goy Lopez, Mauro Raggi, B. Renk, V. Obraztsov, Paolo Valente, A. Cotta Ramusino, A. Ceccucci, Andrea Bizzeti, T. Spadaro, V. Falaleev, G. Dellacasa, Yu. Potrebenikov, F. Newson, S. Movchan, C. Lazzeroni, F. Ambrosino, F. Costantini, Emilio Leonardi, S. Shkarovskiy, M. Hita-Hochgesand, F. Retiere, Antonino Sergi, Roberta Arcidiacono, E. Gushchin, Lau Gatignon, S. Giudici, P. Cenci, M. Sozzi, Evelina Gersabeck, Cristina Biino, O. Yushchenko, V. Kurshetsov, S. Kholodenko, W. Baldini, M. Veltri, G. Saracino, A. Norton, Roland Winston, G. Anzivino, G. Ruggiero, A. Romano, G. Collazuol, F. Marchetto, T. Numao, G. D'Agostini, M. Pepe, F. Bucci, A. Antonelli, A. A. Maier, Lazzeroni, C., Lurkin, N., Newson, F., Romano, A., Ceccucci, A., Danielsson, H., Falaleev, V., Gatignon, L., Goy Lopez, S., Hallgren, B., Maier, A., Peters, A., Piccini, M., Riedler, P., Frabetti, P. L., Gersabeck, E., Kekelidze, V., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Potrebenikov, Yu., Shkarovskiy, S., Zinchenko, A., Rubin, P., Baldini, W., Cotta Ramusino, A., Dalpiaz, P., Fiorini, M., Gianoli, A., Norton, A., Petrucci, F., Savrié, M., Wahl, H., Bizzeti, A., Bucci, F., Veltri, M., Iacopini, E., Lenti, M., Antonelli, A., Moulson, M., Raggi, M., Spadaro, T., Eppard, K., Hita-Hochgesand, M., Kleinknecht, K., Renk, B., Wanke, R., Winhart, A., Winston, R., Bolotov, V., Duk, V., Gushchin, E., Ambrosino, F., Di Filippo, D., Massarotti, P., Napolitano, M., Palladino, V., Saracino, G., Anzivino, G., Imbergamo, E., Piandani, R., Sergi, A., Cenci, P., Pepe, M., Costantini, F., Doble, N., Giudici, S., Pierazzini, G., Sozzi, M., Venditti, S., Balev, S., Collazuol, G., Di Lella, L., Gallorini, S., Goudzovski, E., Lamanna, G., Mannelli, I., Ruggiero, G., Cerri, C., Fantechi, R., Kholodenko, S., Kurshetsov, V., Obraztsov, V., Semenov, V., Yushchenko, O., D'Agostini, G., Leonardi, E., Serra, M., Valente, P., Fucci, A., Salamon, A., Bloch-Devaux, B., Peyaud, B., Engelfried, J., Coward, D., Kozhuharov, V., Litov, L., Arcidiacono, R., Bifani, S., Biino, C., Dellacasa, G., Marchetto, F., Numao, T., and Retière, F.

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, 010308 nuclear & particles physics, Physics beyond the Standard Model, Heavy neutrino, NA62 experiment, 01 natural sciences, lcsh:QC1-999, Heavy neutrinos, Kaon decays, Nuclear physics, Kaon decay, 0103 physical sciences, Mass spectrum, Neutrino, 010306 general physics, lcsh:Physics, Mixing (physics)
Abstract

The NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. In the absence of a signal, limits in the range 2×10−6 to 10−5 have been set on the squared mixing matrix element |Uμ4|2 between muon and heavy neutrino states, for heavy neutrino masses in the range 300–375 MeV/ c2 . The result extends the range of masses for which upper limits have been set on the value of |Uμ4|2 in previous production search experiments.

Published
2017

46. Study of π0 Dalitz decays in the NA62 and NA48/2 experiments

Author

A. Salamon, G. Dellacasa, M. Serra, Giuseppe Ruggiero, F. Bucci, Milena Misheva, E. Maurice, Massimiliano Fiorini, S. Gallorini, F. Costantini, R. Fantechi, Vladimir Kekelidze, Lau Gatignon, Cristina Lazzeroni, A. Antonelli, Rainer Wanke, M. Veltri, V. Obraztsov, A. Romano, V. E. Semenov, T. Numao, Emilio Leonardi, O. Yushchenko, V. Kurshetsov, Mauro Piccini, Paolo Massarotti, A. Winhart, H. Wahl, Augusto Ceccucci, Viacheslav Duk, H. O. Danielsson, Andreas Alexander Maier, S. Shkarovskiy, P. Rubin, I. Popov, D. Di Filippo, N. A. Molokanova, K. Eppard, P. F. Dalpiaz, S. Movchan, F. Ambrosino, A. I. Zinchenko, A. Peters, B. Peyaud, E. Iacopini, G. D'Agostini, Petra Riedler, Cristina Biino, V. Palladino, A. Gianoli, M. Napolitano, I. Mannelli, G. Saracino, E. Gersabeck, Paolo Valente, V. Falaleev, Jürgen Engelfried, W. Baldini, D. T. Madigozhin, Leander Litov, Andrea Bizzeti, Roberta Arcidiacono, P.L. Frabetti, A. Fucci, P. Cenci, R. Winston, D. Coward, Mauro Raggi, E. Gushchin, M. Savrie, B. Bloch-Devaux, Yu. Potrebenikov, M. Pepe, B. Hallgren, B. Renk, S. Balev, V. Kozhuharov, M. Sozzi, S. Goy Lopez, M. Moulson, G. Pierazzini, A. Norton, L. DiLella, F. Marchetto, S. Giudici, A. Cotta Ramusino, V. Bolotov, E. Imbergamo, Evgueni Goudzovski, Simone Bifani, M. Lenti, K. Kleinknecht, S. Venditti, G. Collazuol, T. Spadaro, G. Lamanna, Roberto Piandani, F. Petrucci, C. Cerri, N. Doble, Antonino Sergi, Giuseppina Anzivino, M. Hita-Hochgesand, F. Retiere, Maurice, E., Ambrosino, Fabio, Antonelli, A., Anzivino, G., Arcidiacono, R., Baldini, W., Balev, S., Bifani, S., Biino, C., Bizzeti, A., Bloch Devaux, B., Bolotov, V., Bucci, F., Ceccucci, A., Cenci, P., Cerri, C., Collazuol, G., Costantini, F., Cotta Ramusino, A., Coward, D., D'Agostini, G., Dalpiaz, P., Danielsson, H., Dellacasa, G., DI FILIPPO, Domenico, Dilella, L., Doble, N., Duk, V., Engelfried, J., Eppard, K., Falaleev, V., Fantechi, R., Fiorini, M., Frabetti, P. L., Fucci, A., Gallorini, S., Gatignon, L., Gersabeck, E., Gianoli, A., Giudici, S., Goudzovski, E., Goy Lopez, S., Gushchin, E., Hallgren, B., Hita Hochgesand, M., Iacopini, E., Imbergamo, E., Kekelidze, V., Kleinknecht, K., Kozhuharov, V., Kurshetsov, V., Lamanna, G., Lazzeroni, C., Lenti, M., Leonardi, E., Litov, L., Madigozhin, D., Maier, A., Mannelli, I., Marchetto, F., Massarotti, Paolo, Misheva, M., Molokanova, N., Moulson, M., Movchan, S., Napolitano, Marco, Norton, A., Numao, T., Obraztsov, V., Palladino, Vito, Pepe, M., Peters, A., Petrucci, F., Peyaud, B., Piandani, R., Piccini, M., Pierazzini, G., Popov, I., Potrebenikov, Y. u., Raggi, M., Renk, B., Retière, F., Riedler, P., Romano, A., Rubin, P., Ruggiero, G., Salamon, A., Saracino, Giulio, Savrié, M., Semenov, V., Sergi, A., Serra, M., Shkarovskiy, S., Sozzi, M., Spadaro, T., Valente, P., Veltri, M., Venditti, S., Wahl, H., Wanke, R., Winhart, A., Winston, R., Yushchenko, O., and Zinchenko, A.

Subjects
Nuclear and High Energy Physics, Particle physics, dark photon, NA48/2, NA62, π, 0, form factor, dark photon, π0 form factor, Nuclear Theory, Socio-culturale, Electron, NA62 experiment, 01 natural sciences, Dark photon, Nuclear physics, Pion, PE2_2, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Form factor (quantum field theory), Large sample, π0 form factor, dark photon, π0 form factor, NA48/2, NA62, High Energy Physics::Experiment, Beam (structure)
Abstract

The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from ∼1 million fully reconstructed π 0 Dalitz decay is presented. The limits on dark photon production in π 0 decays from the earlier kaon experiment at CERN, NA48/2, are also reported.

Published
2017

47. Measurement of the pi(0) electromagnetic transition form factor slope

Author

M. Savrie, B. Bloch-Devaux, V. Bolotov, Antonino Sergi, T. Numao, E. Imbergamo, P. F. Dalpiaz, N. Doble, H. D. Wahl, P. Rubin, Nicolas Lurkin, S. Shkarovskiy, I. Mannelli, G. D'Agostini, Jürgen Engelfried, M. Pepe, G.M. Pierazzini, A. Peters, E. Iacopini, G. Saracino, A. Fucci, Lau Gatignon, V. Obraztsov, B. Peyaud, Petra Riedler, Roberto Piandani, Cristina Biino, H. O. Danielsson, V. Palladino, A. Winhart, Emilio Leonardi, S. Goy Lopez, M. Veltri, K. Kleinknecht, C. Cerri, M. Misheva, R. Fantechi, G. Anzivino, S. Giudici, A. Salamon, M. Serra, Tomas Blazek, A. I. Zinchenko, K. Eppard, P. L. Frabetti, A. Cotta Ramusino, F. Marchetto, S. Gallorini, S. Venditti, M. Sozzi, A. Gianoli, G. Dellacasa, Vladimir Kekelidze, P. Cenci, M. Fiorini, Mauro Raggi, L. DiLella, A. Norton, Roland Winston, R. Wanke, G. Lamanna, Mauro Piccini, F. Retiere, F. Costantini, G. Ruggiero, Paolo Massarotti, V. Falaleev, D. T. Madigozhin, V K Semenov, M. Moulson, A. Romano, G. Collazuol, Viacheslav Duk, Roberta Arcidiacono, E. Gushchin, W. Baldini, S. Movchan, C. Lazzeroni, Evelina Gersabeck, F. Ambrosino, O. Yushchenko, S. Balev, M. Hita-Hochgesand, M. Lenti, V. Kurshetsov, S. Kholodenko, Simone Bifani, Evgueni Goudzovski, T. Spadaro, N. A. Molokanova, M. Napolitano, D. Di Filippo, Fabrizio Petrucci, D. Coward, Leander Litov, Yu. Potrebenikov, M. Koval, B. Hallgren, V. Kozhuharov, Paolo Valente, A. Ceccucci, Andrea Bizzeti, A. A. Maier, B. Renk, F. Bucci, A. Antonelli, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, NA62, Lazzeroni, C., Lurkin, N., Romano, A., Blazek, T., Koval, M., Ceccucci, A., Danielsson, H., Falaleev, V., Gatignon, L., Goy Lopez, S., Hallgren, B., Maier, A., Peters, A., Piccini, M., Riedler, P., Frabetti, P. L., Gersabeck, E., Kekelidze, V., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Potrebenikov, Y. u., Shkarovskiy, S., Zinchenko, A., Rubin, P., Baldini, W., Cotta Ramusino, A., Dalpiaz, P., Fiorini, M., Gianoli, A., Norton, A., Petrucci, F., Savrié, M., Wahl, H., Bizzeti, A., Bucci, F., Iacopini, E., Lenti, M., Veltri, M., Antonelli, A., Moulson, M., Raggi, M., Spadaro, T., Eppard, K., Hita Hochgesand, M., Kleinknecht, K., Renk, B., Wanke, R., Winhart, A., Winston, R., Bolotov, V., Duk, V., Gushchin, E., Ambrosino, Fabio, DI FILIPPO, Domenico, Massarotti, Paolo, Napolitano, Marco, Palladino, Vito, Saracino, Giulio, Anzivino, G., Imbergamo, E., Piandani, R., Sergi, A., Cenci, P., Pepe, M., Costantini, F., Doble, N., Giudici, S., Pierazzini, G., Sozzi, M., Venditti, S., Balev, S., Collazuol, G., Dilella, L., Gallorini, S., Goudzovski, E., Lamanna, G., Mannelli, I., Ruggiero, G., Cerri, C., Fantechi, R., Kholodenko, S., Kurshetsov, V., Obraztsov, V., Semenov, V., Yushchenko, O., D'Agostini, G., Leonardi, E., Serra, M., Valente, P., Fucci, A., Salamon, A., Bloch Devaux, B., Peyaud, B., Engelfried, J., Coward, D., Kozhuharov, V., Litov, L., Arcidiacono, R., Bifani, S., Biino, C., Dellacasa, G., Marchetto, F., Numao, T., Retière, F., Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, +pi%2B+pi%22">K+ --> pi+ pi, pi0: radiative decay, S009A, PI, Socio-culturale, Electron, NA62 experiment, 01 natural sciences, NA62, High Energy Physics - Experiment, Nuclear physics, electron: pair production, pion form factor, +electron+positron+photon%22">pi0 --> electron positron photon, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], kaon decays, pion form factor, form factor: slope, PAIR, 0103 physical sciences, transition: electromagnetic, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], RADIATIVE-CORRECTIONS, 010306 general physics, pi0: form factor, Physics, neutral pion, pi0: electromagnetic decay, form factor: transition, DALITZ DECAY, kaon decays, hep-ex, 010308 nuclear & particles physics, Momentum transfer, momentum transfer, Form factor (quantum field theory), trigger, charged kaon, lcsh:QC1-999, Large sample, +pi-+pi0%22">K- --> pi- pi0, K: hadronic decay, Particle Physics - Experiment, Nuclear and High Energy Physics, neutral pion, charged kaon, pion form factor, NA62, lcsh:Physics, experimental results
Abstract

The NA62 experiment collected a large sample of charged kaon decays in 2007 with a highly efficient trigger for decays into electrons. A measurement of the $\pi^0$ electromagnetic transition form factor slope parameter from $1.11\times10^{6}$ fully reconstructed $K^\pm \to \pi^\pm \pi^0_D, \pi^0_D \to e^+ e^-\gamma$ events is reported. The measured value $a = (3.68 \pm 0.57)\times10^{-2}$ is in good agreement with theoretical expectations and previous measurements, and represents the most precise experimental determination of the slope in the time-like momentum transfer region., Comment: 12 pages, 7 figures; Revised version accepted for publication in Physics Letters B

Published
2017

48. Neutral pion form factor measurement by the NA62 experiment

Author

Fabrizio Petrucci, A. Gonidec, Leander Litov, A. Romano, G. Collazuol, P.L. Frabetti, M. Scarpa, M. Hita-Hochgesand, Marco Clemencic, V K Semenov, F. Retire, S. Balev, M. Martini, V. Obraztsov, V. Kozhuharov, B. Hallgren, V. Falaleev, I. Mannelli, Rainer Wanke, M. Shieh, M. Zamkovsky, Alan W. Walker, Roberto Piandani, P. Rubin, Jacqueline Batley, Mark Slater, N. A. Molokanova, Peter Zahariev Hristov, F. Marchetto, N. Doble, O. Yushchenko, A. Winhart, L. Widhalm, L. Masetti, A. Peters, K. Eppard, M. Napolitano, G. Dellacasa, Vladimir Kekelidze, Evgueni Goudzovski, Tomas Blazek, E. C. Swallow, U. Moosbrugger, Antonino Sergi, A. Cotta Ramusino, Evgeny Gushchin, S. Movchan, H. D. Wahl, Simone Bifani, M. Fidecaro, F. Ambrosino, Andreas Alexander Maier, P. F. Dalpiaz, M. Moulson, F. Costantini, B. Peyaud, E. Iacopini, M. C. Petrucci, Petra Riedler, Mauro Piccini, P. Marouelli, A. Michetti, Konrad Kleinknecht, Paolo Massarotti, C. Damiani, T. Spadaro, T. Numao, G. D'Agostini, Ivan Mikulec, V. Palladino, Paolo Valente, M. Veltri, D. Coward, Anne Dabrowski, Viacheslav Duk, G. Lamanna, G. Marel, Emilio Leonardi, M. Pepe, M. Valdata-Nappi, M. Ziolkowski, I. Polenkevich, M. D. Wood, Jürgen Engelfried, Emmanuel Monnier, R. Fantechi, A.I. Zinchenko, M. Markytan, M. Lenti, Milene Calvetti, F. Bucci, A. Ceccucci, M. Holder, H. O. Danielsson, Milena Misheva, Andrea Bizzeti, M. Koval, S. Venditti, V. Bolotov, S. A. Wotton, C. Cerri, H. Dibon, Wander Baldini, G. Bocquet, Yu. Potrebenikov, J. Derr, Cristina Lazzeroni, M. Savri, E. Imbergamo, Maulik R. Patel, A. Antonelli, Mauro Raggi, C. Morales Morales, D. Di Filippo, J. B. Chze, S. Shkarovskiy, T. Fonseca Martin, S. Goy Lopez, A. Salamon, M. Serra, A. Norton, Roland Winston, Massimiliano Fiorini, S. Gallorini, V. Kurshetsov, Nicolo Cartiglia, Stoyan Stoynev, W. Kubischta, D. J. Munday, S. Giudici, M. Sozzi, L. DiLella, Cristina Biino, M. De Beer, M. Wache, D. T. Madigozhin, E. Mazzucato, P. Cenci, M. Behler, Roberta Arcidiacono, Michal Szleper, Nicola Cabibbo, B. Bloch-Devaux, G.E. Kalmus, A. Nappi, Mayda Velasco, Cvetan Valeriev Cheshkov, G. Saracino, E. Gersabeck, B. Renk, Manfred Jeitler, A. Gianoli, G.M. Pierazzini, G. Anzivino, A. Fucci, Lidia Fiorini, B. Vallage, L. Gatignon, I. Popov, G. Neuhofer, D.C. Cundy, Nicolas Lurkin, G. Ruggiero, Zamkovsky, Michal, Ambrosino, F., Antonelli, A., Anzivino, G., Arcidiacono, R., Baldini, W., Balev, S., Batley, J. R., Behler, M., Bifani, S., Biino, C., Bizzeti, A., Blazek, T., Bloch-Devaux, B., Bocquet, G., Bolotov, V., Bucci, F., Cabibbo, N., Calvetti, M., Cartiglia, N., Ceccucci, A., Cenci, P., Cerri, C., Cheshkov, C., Chze, J. B., Clemencic, M., Collazuol, G., Costantini, F., Cotta Ramusino, A., Coward, D., Cundy, D., Dabrowski, A., Dagostini, G., Dalpiaz, P., Damiani, C., Danielsson, H., De Beer, M., Dellacasa, G., Derr, J., Dibon, H., Di Filippo, D., Dilella, L., Doble, N., Duk, V., Engelfried, J., Eppard, K., Falaleev, V., Fantechi, R., Fidecaro, M., Fiorini, L., Fiorini, M., Fonseca Martin, T., Frabetti, P. L., Fucci, A., Gallorini, S., Gatignon, L., Gersabeck, E., Gianoli, A., Giudici, S., Gonidec, A., Goudzovski, E., Goy Lopez, S., Gushchin, E., Hallgren, B., Hita-Hochgesand, M., Holder, M., Hristov, P., Iacopini, E., Imbergamo, E., Jeitler, M., Kalmus, G., Kekelidze, V., Kleinknecht, K., Koval, M., Kozhuharov, V., Kubischta, W., Kurshetsov, V., Lamanna, G., Lazzeroni, C., Lenti, M., Leonardi, E., Litov, L., Lurkin, N., Madigozhin, D., Maier, A., Mannelli, I., Marchetto, F., Marel, G., Markytan, M., Marouelli, P., Martini, M., Masetti, L., Massarotti, P., Mazzucato, E., Michetti, A., Mikulec, I., Misheva, M., Molokanova, N., Monnier, E., Moosbrugger, U., Morales Morales, C., Moulson, M., Movchan, S., Munday, D. J., Napolitano, M., Nappi, A., Neuhofer, G., Norton, A., Numao, T., Obraztsov, V., Palladino, V., Patel, M., Pepe, M., Peters, A., Petrucci, F., Petrucci, M. C., Peyaud, B., Piandani, R., Piccini, M., Pierazzini, G., Polenkevich, I., Popov, I., Potrebenikov, Y., Raggi, M., Renk, B., Retire, F., Riedler, P., Romano, A., Rubin, P., Ruggiero, G., Salamon, A., Saracino, G., Savri, M., Scarpa, M., Semenov, V., Sergi, A., Serra, M., Shieh, M., Shkarovskiy, S., Slater, M. W., Sozzi, M., Spadaro, T., Stoynev, S., Swallow, E., Szleper, M., Valdata-Nappi, M., Valente, P., Vallage, B., Velasco, M., Veltri, M., Venditti, S., Wache, M., Wahl, H., Walker, A., Wanke, R., Widhalm, L., Winhart, A., Winston, R., Wood, M. D., Wotton, S. A., Yushchenko, O., Zinchenko, A., and Ziolkowski, M.

Subjects
Physics, History, Particle physics, 02 Physical Sciences, Meson, 010308 nuclear & particles physics, Nuclear Theory, Form factor (quantum field theory), Elementary particle, NA62 experiment, 01 natural sciences, 09 Engineering, Dark photon, Computer Science Applications, Education, Nuclear physics, Physics and Astronomy (all), Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Lepton, Dimensionless quantity
Abstract

The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from ∼1 million fully reconstructed π 0 Dalitz decay is presented. The limits on dark photon production in π 0 decays from the earlier kaon experiment at CERN, NA48/2, are also reported.

Published
2017

49. Study of the K±→π±γγ decay by the NA62 experiment

Author

T. Spadaro, A. Winhart, M. Lenti, O. Yushchenko, Mauro Piccini, A. I. Zinchenko, Paolo Massarotti, P. L. Frabetti, M. Serra, V. Kurshetsov, S. Kholodenko, Konrad Kleinknecht, Evgueni Goudzovski, A. Gianoli, S. Gallorini, C. Cerri, H. O. Danielsson, M. Moulson, V K Semenov, G. Lamanna, D. T. Madigozhin, T. Numao, N. Doble, Viacheslav Duk, S. Shkarovskiy, B. Renk, Rainer Wanke, M. Veltri, V. Bolotov, Fabrizio Petrucci, G. D'Agostini, D. Coward, A. Norton, Roland Winston, A. Fucci, Vladimir Kekelidze, S. Movchan, A. Ceccucci, E. Imbergamo, M. Pepe, F. Ambrosino, S. Balev, Andrea Bizzeti, M. Misheva, D. Di Filippo, Leander Litov, H. D. Wahl, Emilio Leonardi, B. Peyaud, Petra Riedler, W. Baldini, G. Pierazzini, P. F. Dalpiaz, A. Peters, M. Savrie, Simone Bifani, A. Cotta Ramusino, B. Bloch-Devaux, B. Hallgren, V. Obraztsov, G. Dellacasa, Giuseppe Ruggiero, V. Palladino, F. Marchetto, Jürgen Engelfried, A. Salamon, S. Venditti, F. Costantini, N. A. Molokanova, K. Eppard, V. Falaleev, M. Napolitano, I. Mannelli, A. Romano, G. Collazuol, A. A. Maier, P. Valente, F. Bucci, Cristina Lazzeroni, A. Antonelli, Roberto Piandani, M. Hita-Hochgesand, Roberta Arcidiacono, E. Gushchin, F. Retiere, Antonino Sergi, Evelina Gersabeck, R. Fantechi, Cristina Biino, Lau Gatignon, V. Kozhuharov, Mauro Raggi, P. Rubin, P. Cenci, E. Iacopini, M. Sozzi, Yu. Potrebenikov, L. DiLella, Massimiliano Fiorini, S. Giudici, S. Goy Lopez, G. Saracino, and G. Anzivino

Subjects
Physics, Nuclear and High Energy Physics, Particle decay, Pion, Chiral perturbation theory, Nuclear magnetic resonance, Meson, Branching fraction, Hadron, Analytical chemistry, Elementary particle, Dimensionless quantity
Abstract

A study of the dynamics of the rare decay K ± → π ± γ γ has been performed on a sample of 232 decay candidates, with an estimated background of 17.4 ± 1.1 events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 Collaboration at CERN. The combined model-independent branching ratio in the kinematic range z = ( m γ γ / m K ) 2 > 0.2 is B MI ( z > 0.2 ) = ( 0.965 ± 0.063 ) × 10 − 6 , and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is B ( K π γ γ ) = ( 1.003 ± 0.056 ) × 10 − 6 . A detailed comparison of the results with the previous measurements is performed.

Published
2014

50. A new measurement of the K±→π±γγ decay at the NA48/2 experiment

Author

Fabrizio Petrucci, B. Vallage, Lau Gatignon, Cristina Biino, G. Neuhofer, A. Winhart, M. Sozzi, L. DiLella, Massimiliano Fiorini, Leander Litov, S. Giudici, T. Fonseca Martin, E. Monnier, P. Cenci, D.C. Cundy, Nicola Cabibbo, C. Cheshkov, V. Kozhuharov, R. Fantechi, M. Veltri, A. I. Zinchenko, D.J. Munday, Milene Calvetti, W. Kubischta, M. Savrie, Marco Clemencic, Nicolo Cartiglia, M. Pepe, I. Polenkevich, B. Bloch-Devaux, N. Doble, M. D. Wood, Enrico Celeghini, Mauro Piccini, A. Ceccucci, I. Mannelli, A. Gianoli, P. Hristov, Evelina Gersabeck, G.E. Kalmus, M. Szleper, A. Peters, Andrea Bizzeti, M. De Beer, H. Dibon, Wander Baldini, Cristina Lazzeroni, F. Marchetto, A. Cotta Ramusino, A. Dabrowski, Ivan Mikulec, L. Widhalm, S. Goy Lopez, J.B. Cheze, J. Derre, M. C. Petrucci, Mauro Raggi, A. Norton, Roland Winston, C. Morales Morales, M. Behler, Roberta Arcidiacono, A. A. Maier, F. Costantini, G. Ruggiero, E. Imbergamo, Luca Fiorini, M. Ziolkowski, S. Stoynev, L. Masetti, Mayda Velasco, A. Gonidec, P. Rubin, C. Cerri, M. Wache, Vladimir Kekelidze, P. Marouelli, D. T. Madigozhin, U. Moosbrugger, G. Collazuol, M. Markytan, M. Lenti, E. Iacopini, H. D. Wahl, M. Fidecaro, G.M. Pierazzini, E. Mazzucato, B. Peyaud, P. F. Dalpiaz, M.W. Slater, G. Lamanna, M. Shieh, B. Renk, C. Damiani, J. R. Batley, M. Scarpa, G. Bocquet, Yu. Potrebenikov, Evgueni Goudzovski, S. Balev, M. Martini, Alan W. Walker, V. Falaleev, A. Nappi, Manfred Jeitler, G. Anzivino, N. A. Molokanova, K. Eppard, P. L. Frabetti, Konrad Kleinknecht, A. Michetti, M. Valdata-Nappi, M. Holder, S. Venditti, S. A. Wotton, Maulik R. Patel, Simone Bifani, Rainer Wanke, E. C. Swallow, D. Coward, and G. Marel

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Pion, Chiral perturbation theory, Meson, Branching fraction, Hadron, Analytical chemistry, Radioactive decay, Dimensionless quantity
Abstract

The NA48/2 experiment at CERN collected two data samples with minimum bias trigger conditions in 2003 and 2004. A measurement of the rate and dynamic properties of the rare decay K ± → π ± γ γ from these data sets based on 149 decay candidates with an estimated background of 15.5 ± 0.7 events is reported. The model-independent branching ratio in the kinematic range z = ( m γ γ / m K ) 2 > 0.2 is measured to be B MI ( z > 0.2 ) = ( 0.877 ± 0.089 ) × 10 − 6 , and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B ( K π γ γ ) = ( 0.910 ± 0.075 ) × 10 − 6 .

Published
2014

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