51 results on '"C. Cerri"'
Search Results
2. A search for the K+ → μ−νe+e+ decay
- Author
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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, P. Rubin, and UCL - SST/IRMP - Institut de recherche en mathématique et physique
- Subjects
Lepton flavour violation ,Lepton number violation ,Nuclear and High Energy Physics ,Settore FIS/04 ,Nuclear and High Energy physics ,Kaon decays - Published
- 2023
3. First search for K+→π+νν¯ using the decay-in-flight technique
- Author
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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
4. WEIGHT LOSS AFTER LAPAROSCOPIC SLEEVE GASTRECTOMY: THE 4-YEARS EXPERIENCE AT MAGGIORE DELLA CARITÀ HOSPITAL (NOVARA, PIEDMONT)
- Author
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Edda Cava, C. Cerri, E. Albertazzi, G. D'Aloisio, E.C. Capello, F. Butera, Alessandro Collo, Sergio Riso, S.A. Passera, L. Scotti, and S. Gentilli
- Subjects
medicine.medical_specialty ,Laparoscopic sleeve gastrectomy ,Nutrition and Dietetics ,Weight loss ,business.industry ,Endocrinology, Diabetes and Metabolism ,medicine ,medicine.symptom ,business ,Surgery - Published
- 2021
5. Search forK+→π+νν‾at NA62
- Author
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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
6. Prospects forK+→π+νν‾observation at CERN in NA62
- Author
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G. Khoriauli, G. Aglieri Rinella, R. Aliberti, F. Ambrosino, B. Angelucci, A. Antonelli, G. Anzivino, R. Arcidiacono, I. Azhinenko, S. Balev, J. Bendotti, A. Biagioni, C. Biino, A. Bizzeti, T. Blazek, A. Blik, B. Bloch-Devaux, V. Bolotov, V. Bonaiuto, M. Bragadireanu, D. Britton, G. Britvich, F. Bucci, F. Butin, E. Capitolo, C. Capoccia, T. Capussela, V. Carassiti, N. Cartiglia, A. Cassese, A. Catinaccio, A. Cecchetti, A. Ceccucci, P. Cenci, V. Cerny, C. Cerri, B. Checcucci, O. Chikilev, R. Ciaranfi, G. Collazuol, A. Conovaloff, P. Cooke, P. Cooper, G. Corradi, E. Cortina Gil, F. Costantini, 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, N. Dixon, N. Doble, V. Duk, V. Elsha, J. Engelfried, T. Enik, V. Falaleev, R. Fantechi, V. Fascianelli, L. Federici, M. Fiorini, J. Fry, A. Fucci, L. Fulton, S. Gallorini, 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, D. Hutchcroft, E. Iacopini, E. Imbergamo, O. Jamet, P. Jarron, K. Kampf, J. Kaplon, V. Karjavin, V. Kekelidze, S. Kholodenko, A. Khudyakov, Yu. Kiryushin, K. Kleinknecht, A. Kluge, M. Koval, V. Kozhuharov, M. Krivda, Y. Kudenko, J. Kunze, G. Lamanna, C. Lazzeroni, R. Lenci, M. Lenti, E. Leonardi, P. Lichard, R. Lietava, L. Litov, D. Lomidze, A. Lonardo, N. Lurkin, D. Madigozhin, G. Maire, A. Makarov, C. Mandeiro, I. Mannelli, G. Mannocchi, A. Mapelli, F. Marchetto, R. Marchevski, S. Martellotti, P. Massarotti, K. Massri, P. Matak, E. Maurice, E. Menichetti, G. Mila, 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, V. Obraztsov, A. Ostankov, S. Padolski, R. Page, V. Palladino, A. Pardons, 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, M. Pivanti, I. Polenkevich, I. Popov, 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, E. Santovetti, G. Saracino, F. Sargeni, S. Schifano, V. Semenov, A. Sergi, M. Serra, S. Shkarovskiy, D. Soldi, A. Sotnikov, V. Sougonyaev, M. Sozzi, T. Spadaro, F. Spinella, R. Staley, M. Statera, P. Sutcliffe, N. Szilasi, D. Tagnani, M. Valdata-Nappi, P. Valente, M. Vasile, T. Vassilieva, B. Velghe, M. Veltri, S. Venditti, R. Volpe, 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 ,010308 nuclear & particles physics ,Branching fraction ,Physics beyond the Standard Model ,0103 physical sciences ,Sensitivity (control systems) ,010306 general physics ,01 natural sciences ,Standard Model - Published
- 2016
7. Study of the K±→π±γγ decay by the NA62 experiment
- Author
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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
8. A new measurement of the K±→π±γγ decay at the NA48/2 experiment
- Author
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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
9. R&D on a Fast LXe TPC with real-time event reconstruction
- Author
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Giovanni Signorelli, Angela Papa, Marco Grassi, A. M. Baldini, L. Galli, C. Cerri, and S. Dussoni
- Subjects
Physics ,Nuclear and High Energy Physics ,Scintillation ,Physics::Instrumentation and Detectors ,business.industry ,Detector ,chemistry.chemical_element ,Silicon photomultiplier ,Optics ,Nuclear magnetic resonance ,Xenon ,chemistry ,Ionization ,Particle physics experiments ,business ,Instrumentation ,Event (particle physics) ,Event reconstruction - Abstract
The FOXFIRE project (Feasibility Of a Xenon detector with Front-end for Ionization Real-time Extraction) aims at the realization of a Liquid Xenon TPC optimized for high rate particle physics experiments, in particular in the field of rare event searches, with particles in the 10–100 MeV energy range. Liquid Xenon has several attractive properties to be exploited resulting in superior time and energy resolution, by using the scintillation light readout with suitable photo-detectors. A novel approach with a complementary TPC readout scheme can improve the space resolution to a level of a few hundred microns. We are studying both the feasibility of a light readout with higher granularity by means of Silicon PhotoMultipliers optimized for the Xenon emission spectrum as well as on an innovative micro-fabricated device capable of charge multiplication in liquid phase. The detector will be equipped with a readout electronics capable of online reconstruction of events, allowing the detector to sustain a high rate of interactions.
- Published
- 2013
10. Measurement of the branching ratio of the decay Ξ0→Σ+μ−ν¯μ
- Author
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Milene Calvetti, H. Dibon, G.M. Pierazzini, L. Gatignon, G. Ruggiero, A. Gonidec, Cristina Lazzeroni, P. F. Dalpiaz, M. De Beer, S. Giudici, G. Collazuol, T. Fonseca Martin, Mauro Piccini, E. Monnier, G. Bocquet, Yu. Potrebenikov, D.J. Munday, Nicolo Cartiglia, Manfred Jeitler, M. Scarpa, G. Neuhofer, D.C. Cundy, A. Winhart, Rainer Wanke, H. Wahl, Nadia Pastrone, R. Sacco, A. Hirstius, G. Anzivino, G. Gouge, Simone Bifani, M. Behler, Marco Clemencic, M. Pepe, P. Marouelli, B. Panzer-Steindel, M. Veltri, P. Debu, E. Iacopini, R. Winston, S. Wotton, A. Maier, N. Doble, Vladimir Kekelidze, P. Cenci, E. C. Swallow, N. A. Molokanova, P. Grafström, W. Baldini, K. Eppard, Cristina Biino, M. Ziolkowski, P. Rubin, P. Lubrano, M. Holder, A. Nappi, D. T. Madigozhin, A. Peters, Evgueni Goudzovski, F. Costantini, I. Mannelli, M. Sozzi, S. Stoynev, L. Widhalm, S. Goy Lopez, Roberta Arcidiacono, U. Koch, W. Wislicki, U. Moosbrugger, M. Martini, A. Norton, M. Patel, W. Kubischta, Konrad Kleinknecht, G. Marel, M.W. Slater, A. Zinchenko, L. Masetti, Ivan Mikulec, E. Menichetti, E. Mazzucato, P. Hristov, J. R. Batley, E. Imbergamo, B. Peyaud, C. Cheshkov, V. Kozhuharov, M. Eppard, V. Falaleev, M. Savrie, F. Marchetto, A. Michetti, G.E. Kalmus, C. Cerri, B. Vallage, Fabrizio Petrucci, A. Ceccucci, Andrea Bizzeti, Leander Litov, P.L. Frabetti, A. Gianoli, Alan W. Walker, C. Morales Morales, M. Valdata, A. Dabrowski, M. C. Petrucci, Mayda Velasco, M. Markytan, M. Lenti, J.B. Cheze, G. Lamanna, Luca Fiorini, and R. Fantechi
- Subjects
Physics ,Nuclear and High Energy Physics ,Meson ,010308 nuclear & particles physics ,Branching fraction ,Hadron ,Analytical chemistry ,Elementary particle ,01 natural sciences ,Nuclear physics ,0103 physical sciences ,010306 general physics ,Boson ,Dimensionless quantity - Abstract
From the 2002 data taking with a neutral kaon beam extracted from the CERN-SPS, the NA48/1 experiment observed 97 Ξ 0 → Σ + μ − ν ¯ μ candidates with a background contamination of 30.8 ± 4.2 events. From this sample, the BR ( Ξ 0 → Σ + μ − ν ¯ μ ) is measured to be ( 2.17 ± 0.32 stat ± 0.17 syst ) × 10 − 6 .
- Published
- 2013
11. New measurement of the K±→π+π−e±ν (Ke4) decay branching ratio and hadronic form factors
- Author
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Cvetan Valeriev Cheshkov, Stoyan Stoynev, W. Kubischta, A. Gianoli, Simone Bifani, M. Scarpa, M. Markytan, M. Lenti, D. J. Munday, G. Ruggiero, P. Rubin, S. Venditti, A.I. Zinchenko, V. Falaleev, Ivan Mikulec, M. Wache, E. Iacopini, S. Balev, M. Martini, D. T. Madigozhin, M. Sozzi, E. Monnier, A. Gonidec, S. A. Wotton, L. DiLella, B. Renk, Konrad Kleinknecht, E. Mazzucato, Mauro Piccini, Massimiliano Fiorini, E. Gersabeck, M. C. Petrucci, D. Coward, M. Valdata-Nappi, R. Fantechi, A. Peters, Peter Zahariev Hristov, G. Collazuol, Milene Calvetti, Manfred Jeitler, Vladimir Kekelidze, C. Morales Morales, Jacqueline Batley, P. Cenci, Wood, S. Giudici, A. Cotta Ramusino, Mayda Velasco, M. Veltri, S. Goy Lopez, H. Dibon, M. Ziolkowski, J. Derre, I. Mannelli, A. Norton, Roland Winston, G. Lamanna, C. Lazzeroni, G. Anzivino, G.M. Pierazzini, Roberta Arcidiacono, Mauro Raggi, G. Marel, U. Moosbrugger, J.B. Cheze, A. Michetti, F. Marchetto, Rainer Wanke, Fabrizio Petrucci, Cristina Biino, V. Kozhuharov, P. Marouelli, E. Imbergamo, Luca Fiorini, L. Widhalm, B. Vallage, Leander Litov, L. Masetti, P.L. Frabetti, Mark Slater, W. Baldini, A. Winhart, L. Gatignon, Alan W. Walker, E. C. Swallow, Anne Dabrowski, G. Neuhofer, Nicolo Cartiglia, M. Pepe, F. Costantini, M. Holder, N. A. Molokanova, A. Nappi, D.C. Cundy, K. Eppard, G. Bocquet, Yu. Potrebenikov, T. Fonseca Martin, M. Patel, Marco Clemencic, I. Polenkevich, M. De Beer, M. Behler, A. Ceccucci, Andrea Bizzeti, Michal Szleper, Evgueni Goudzovski, Nicola Cabibbo, H. D. Wahl, M. Fidecaro, B. Peyaud, M. Savrie, B. Bloch-Devaux, G.E. Kalmus, C. Cerri, N. Doble, C. Damiani, M. Shieh, P. F. Dalpiaz, and A. A. Maier
- Subjects
Normalization (statistics) ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Large Hadron Collider ,010308 nuclear & particles physics ,Branching fraction ,Scattering ,Hadron ,Form factor (quantum field theory) ,01 natural sciences ,Nuclear physics ,0103 physical sciences ,Pi ,Relative precision ,010306 general physics - Abstract
A sample of more than one million K±→π+π−e±ν ( Ke4 ) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003–2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of Ke4γ decays, is measured to be BR(Ke4)=(4.257±0.016exp±0.031ext)×10−5 with a total relative error of 0.8% . This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the ππ scattering lengths conducted on the same data sample. The overall form factor normalization fs=5.705±0.017exp±0.031ext is obtained with a total relative precision of 0.6% .
- Published
- 2012
12. Calibration and monitoring of the MEG experiment by a proton beam from a Cockcroft–Walton accelerator
- Author
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D.N. Grigoriev, M. Rossella, P.-R. Kettle, Luca Galli, A. M. Baldini, Marco Grassi, Flavio Gatti, A. de Bari, Tomiyoshi Haruyama, R. Pazzi, J. Adam, Stefan Ritt, N. P. Kravchuk, M. Panareo, W. R. Molzon, H. Natori, M. Corbo, Donato Nicolo, G. Gallucci, E. Baracchini, D. Mzavia, Fedor Ignatov, Satoshi Mihara, Hajime Nishiguchi, Gianluigi Boca, Tadayoshi Doke, T. Iwamoto, P. W. Cattaneo, M. De Gerone, C. Topchyan, C. Voena, B. Golden, K. Fratini, J. Egger, X. Bai, A. Maki, Malte Hildebrandt, Yu.V. Yudin, N. Curalli, Angela Papa, Yasuhiro Nishimura, C. Cerri, O. Kiselev, A. S. Korenchenko, Wataru Ootani, R. Valle, B.I. Khazin, Akira Yamamoto, Ryu Sawada, Fabrizio Cei, C. Bemporad, F. Renga, A.S. Popov, Giovanni Signorelli, F. Sergiampietri, Yuki Fujii, G. Cavoto, F. Tenchini, G. Piredda, D. Zanello, F. Xiao, Takehiko Mori, Yusuke Uchiyama, and S. Dussoni
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Muon ,Spectrometer ,Proton ,Branching fraction ,Particle accelerator ,law.invention ,Calorimeter ,γrays ,Beam monitoring ,Calibration ,CockcroftWalton accelerator ,Instrumentation ,Nuclear physics ,law ,Nucleon - Abstract
The MEG experiment at PSI searches for the decay μ → e γ at a level of ≈ 10 − 13 on the branching ratio BR ( μ → e γ / μ → tot ), well beyond the present experimental limit ( BR ≤ 1.2 × 10 − 11 ) and is sensitive to the predictions of SUSY-GUT theories. To reach this goal the experiment uses one of the most intense continuous surface muon beams available ( ≈ 10 8 μ / s ) and relies on advanced technology (LXe calorimetry, a gradient-field superconducting spectrometer as well as flexible and powerful trigger and acquisition systems). In order to maintain the highest possible energy, time and spatial resolutions for such detector, frequent calibration and monitoring, using a Cockcroft–Walton proton accelerator, are required. The proton beam is brought to the centre of MEG by a special bellows insertion system and travels in a direction opposite to the one of the normal μ ‐ beam . Protons interact with a lithium tetraborate (Li2B4O7) nuclear target and produce one γ (17.6 MeV) from the reaction Li ( p , γ ) 3 7 Be 4 8 or two coincident γ s (11.67 and 4.4 MeV) from the reaction B ( p , γ 1 ) 5 11 C ⁎ 6 12 . The 17.6 MeV γ is used for calibrating and monitoring the LXe calorimeter ( σ E γ / E γ = 3.85 ± 0.15 % at 17.6 MeV) while the coincident 11.67 and 4.4 MeV γ s are used to measure the relative timing of the calorimeter and the spectrometer timing counters ( σ Δ t = 0.450 ± 0.015 ns ).
- Published
- 2011
13. Test of lepton flavour universality in K+→ℓ+ν decays
- Author
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N. A. Molokanova, K. Eppard, M. Napolitano, Fabrizio Petrucci, D. Coward, Leander Litov, B. Hallgren, Antonino Sergi, P. L. Frabetti, V. Kozhuharov, H. O. Danielsson, P. Rubin, N. Doble, M. Veltri, T. Numao, Oleg Yushchenko, V. Obraztsov, A. Norton, Roland Winston, Evgueni Goudzovski, E. Iacopini, M. Pepe, M. Hita-Hochgesand, B. Renk, A. Antonelli, F. Retiere, G. D'Agostini, Roberta Arcidiacono, T. Spadaro, Paolo Valente, E. Gushchin, R. Fantechi, Cristina Biino, Viacheslav Duk, A. A. Maier, P. F. Dalpiaz, F. Marchetto, M. Lenti, A. Peters, Yu. Potrebenikov, Konrad Kleinknecht, W. Baldini, A. Winhart, S. Movchan, C. Lazzeroni, Mauro Piccini, F. Ambrosino, S. Giudici, G. Ruggiero, A. I. Zinchenko, G. Saracino, Jürgen Engelfried, Roberto Piandani, V. Kurshetsov, C. Cerri, I. Mannelli, A. Romano, M. Sozzi, A. Gianoli, Mauro Raggi, G. Collazuol, D. Di Filippo, L. DiLella, Massimiliano Fiorini, G.M. Pierazzini, V. Palladino, M. Dyulendarova, S. Goy Lopez, V K Semenov, D. T. Madigozhin, A. Fucci, G. Anzivino, Lau Gatignon, F. Bucci, S. Balev, Vladimir Kekelidze, A. Ceccucci, P. Cenci, Andrea Bizzeti, Simone Bifani, H. D. Wahl, B. Peyaud, Petra Riedler, V. Falaleev, S. Venditti, I. Popov, M. Serra, E. Marinova, P. Massarotti, M. Savrie, V. Bolotov, B. Bloch-Devaux, E. Imbergamo, A. Cotta Ramusino, G. Lamanna, G. Dellacasa, A. Salamon, F. Costantini, Emilio Leonardi, Rainer Wanke, Stefano Gallorini, M. Moulson, and S. Shkarovskiy
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Flavour ,Width ratio ,Universality (dynamical systems) ,Lepton - Abstract
A precision test of lepton flavour universality has been performed by measuring the ratio R K of kaon leptonic decay rates K + → e + ν and K + → μ + ν in a sample of 59 813 reconstructed K + → e + ν candidates with ( 8.71 ± 0.24 ) % background contamination. The result R K = ( 2.487 ± 0.013 ) × 10 − 5 is in agreement with the Standard Model expectation.
- Published
- 2011
14. New measurement of the K±→π±μ+μ− decay
- Author
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A. Gonidec, G. Collazuol, Milene Calvetti, H. Dibon, H. D. Wahl, Nicola Cabibbo, C. Cheshkov, V. Kozhuharov, Mauro Raggi, M. Fidecaro, M. Savrie, B. Bloch-Devaux, B. Peyaud, E. Iacopini, M. Sozzi, D. Coward, G. Neuhofer, F. Marchetto, G.E. Kalmus, S. A. Wotton, L. Widhalm, M. De Beer, D.C. Cundy, Massimiliano Fiorini, Wood, Vladimir Kekelidze, Fabrizio Petrucci, G. Bocquet, Yu. Potrebenikov, G. Marel, Rainer Wanke, N. Doble, A. Winhart, P. Rubin, A. Nappi, M. Pepe, Simone Bifani, M. Markytan, M. Lenti, B. Vallage, M. Behler, W. Kubischta, E. C. Swallow, C. Lazzeroni, Leander Litov, J.B. Cheze, Evgueni Goudzovski, D. J. Munday, M. Holder, I. Mannelli, Luca Fiorini, Cristina Biino, M. Veltri, S. Goy Lopez, A. Ceccucci, A. Peters, Andrea Bizzeti, A. Norton, Roland Winston, Ivan Mikulec, A. I. Zinchenko, A. A. Maier, V. Falaleev, C. Cerri, E. Marinova, M. Scarpa, Enrico Celeghini, A. Dabrowski, G.M. Pierazzini, T. Fonseca Martin, Maulik R. Patel, Mauro Piccini, M. C. Petrucci, L. Masetti, A. Gianoli, C. Damiani, M. Ziolkowski, Konrad Kleinknecht, Manfred Jeitler, S. Stoynev, P. Marouelli, S. Giudici, B. Renk, M. Valdata-Nappi, G. Anzivino, Alan W. Walker, M. Shieh, S. Balev, M. Martini, W. Baldini, P. L. Frabetti, M. Wache, Nicolo Cartiglia, D. T. Madigozhin, A. Michetti, E. Mazzucato, N. A. Molokanova, K. Eppard, Marco Clemencic, C. Morales Morales, Mayda Velasco, I. Polenkevich, Mark Slater, M. Szleper, E. Imbergamo, F. Costantini, L. Di Lella, P. F. Dalpiaz, S. Venditti, G. Lamanna, U. Moosbrugger, A. Cotta Ramusino, E. Monnier, Lau Gatignon, P. Cenci, Jacqueline Batley, G. Ruggiero, P. Hristov, J. Derre, Roberta Arcidiacono, and R. Fantechi
- Subjects
Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Particle decay ,Antiparticle ,Muon ,Pion ,Meson ,Branching fraction ,Analytical chemistry ,Lepton ,Dimensionless quantity - Abstract
A sample of 3120 K ± → π ± μ + μ − decay candidates with ( 3.3 ± 0.7 ) % background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a detailed study of the decay properties. The branching ratio was measured to be BR = ( 9.62 ± 0.25 ) × 10 − 8 . The form factor W ( z ) , where z = ( M μ μ / M K ) 2 , was parameterized according to several models. In particular, the slope of the linear form factor W ( z ) = W 0 ( 1 + δ z ) was measured to be δ = 3.11 ± 0.57 . Upper limits of 2.9 × 10 − 2 and 2.3 × 10 − 2 on possible charge asymmetry and forward–backward asymmetry were established at 90% CL. An upper limit BR ( K ± → π ∓ μ ± μ ± ) 1.1 × 10 − 9 was established at 90% CL for the rate of the lepton number violating decay.
- Published
- 2011
15. New precise measurements of the and decay asymmetries
- Author
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S. Stoynev, E. Monnier, R. Sacco, U. Moosbrugger, Nadia Pastrone, M. Valdata, M. Calvetti, B. Vallage, N. A. Molokanova, K. Eppard, M. C. Petrucci, Roberta Arcidiacono, D. T. Madigozhin, G. Ruggiero, Marco Clemencic, R. Fantechi, P. F. Dalpiaz, A. Maier, F. Costantini, E. Mazzucato, A. Winhart, T. Fonseca Martin, Mauro Piccini, E. Imbergamo, C. Cerri, P. Lubrano, A. Michetti, A. Nappi, H. Dibon, Anne Dabrowski, Lau Gatignon, M. Pepe, M. Ziolkowski, M. Markytan, B. Panzer-Steindel, G. Neuhofer, C. Morales Morales, M. Lenti, Leander Litov, G. Lamanna, E. Menichetti, D.C. Cundy, M. De Beer, A. Ceccucci, Andrea Bizzeti, Cristina Biino, P. Cenci, P.L. Frabetti, S. Goy Lopez, F. Marchetto, Jacqueline Batley, Manfred Jeitler, L. Widhalm, Mayda Velasco, E. Iacopini, H. D. Wahl, P. Grafström, M. Holder, F. Petrucci, P. Rubin, M. Scarpa, M. Behler, U. Koch, G. Pierazzini, Alan W. Walker, W. Wislicki, B. Peyaud, G. Bocquet, Yu. Potrebenikov, G. Anzivino, A. Gonidec, A. I. Zinchenko, M. Sozzi, G. Gouge, A. Hirstius, S. A. Wotton, C. Cheshkov, S. Giudici, J.B. Cheze, M. Savrie, C. Lazzeroni, M. Slater, A. Gianoli, Niels Doble, D.J. Munday, Evgueni Goudzovski, I. Mannelli, L. Fiorini, L. Masetti, V. Falaleev, M. Veltri, A. Norton, Roland Winston, Nicolo Cartiglia, P. Marouelli, W. Baldini, Konrad Kleinknecht, P. Debu, G. Collazuol, G. Marel, Maulik R. Patel, M. Martini, M. Eppard, W. Kubischta, Rainer Wanke, E. C. Swallow, G. Kalmus, A. Peters, Ivan Mikulec, Peter Zahariev Hristov, and Vladimir Kekelidze
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,010308 nuclear & particles physics ,Hadron ,Hyperon ,Gamma ray ,Elementary particle ,Fermion ,01 natural sciences ,Nuclear physics ,Baryon ,Particle decay ,0103 physical sciences ,010306 general physics ,Radioactive decay - Abstract
The decay asymmetries of the weak radiative hyperon decays Ξ 0 → Λ γ and Ξ 0 → Σ 0 γ have been measured with high precision using data of the NA48/1 experiment at CERN. From about 52 000 Ξ 0 → Λ γ and 15 000 Ξ 0 → Σ 0 γ decays, we obtain for the decay asymmetries α Ξ 0 → Λ γ = − 0.704 ± 0.019 stat ± 0.064 syst and α Ξ 0 → Σ 0 γ = − 0.729 ± 0.030 stat ± 0.076 syst , respectively. These results are in good agreement with previous experiments, but more precise.
- Published
- 2010
16. A limit for the decay from the MEG experiment
- Author
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E. Baracchini, Stefan Ritt, J. Egger, N.P. Kravchuk, F. Xiao, M. Hildebrandt, H. Natori, R. Pazzi, C. Bemporad, Yusuke Uchiyama, A. M. Baldini, G. Piredda, S. Yamada, B. I. Khazin, P.-R. Kettle, Y. Nishimura, G. Gallucci, Y. Hisamatsu, A. Korenchenko, D.N. Grigoriev, A. de Bari, Tomiyoshi Haruyama, Flavio Gatti, M. Panareo, Roberto Di Nardo, F. Ignatov, C. Topchyan, S. Dussoni, V. Tumakov, Satoshi Mihara, M. De Gerone, J. Adam, Hajime Nishiguchi, G. Cecchet, Martin Schneebeli, O. Kiselev, S. Suzuki, C. Cerri, D. Kaneko, R. Valle, G. Cavoto, Ryu Sawada, B. Golden, D. Zanello, G. Boca, Fabrizio Cei, P. W. Cattaneo, W. R. Molzon, C. Voena, T. Iwamoto, L. Galli, T. Doke, A. Barchiesi, A.S. Popov, Angela Papa, D. Mzavia, F. Sergiampietri, Wataru Ootani, A. Maki, Giovanni Signorelli, X. Bai, S. Yamashita, Yu.V. Yudin, M. Grassi, Akira Yamamoto, Toshinori Mori, Donato Nicolo, F. Renga, and Massimo Rossella
- Subjects
Superconductivity ,Physics ,Nuclear and High Energy Physics ,Photon ,Spectrometer ,Branching fraction ,Physics::Medical Physics ,Analytical chemistry ,chemistry.chemical_element ,Calorimeter ,Nuclear physics ,Positron ,Xenon ,chemistry ,High Energy Physics::Experiment ,Limit (mathematics) ,Lepton flavour violation ,Muon decay - Abstract
A search for the decay μ + → e + γ , performed at PSI and based on data from the initial three months of operation of the MEG experiment, yields an upper limit on the branching ratio of BR ( μ + → e + γ ) ⩽ 2.8 × 10 − 11 (90% C.L.). This corresponds to the measurement of positrons and photons from ∼ 10 14 stopped μ + -decays by means of a superconducting positron spectrometer and a 900 litre liquid xenon photon detector.
- Published
- 2010
17. Empirical parameterization of the K±→π±π0π0 decay Dalitz plot
- Author
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E. Monnier, A. Winhart, A. Nappi, C. Lazzeroni, B. Renk, T. Fonseca Martin, M. Holder, Mauro Piccini, F. Costantini, P. L. Frabetti, A. Michetti, Jacqueline Batley, Peter Zahariev Hristov, B. Vallage, S. Bifani, G.M. Pierazzini, Vladimir Kekelidze, M. Slater, M. Szleper, Cristina Biino, I. Polenkevich, J.B. Cheze, A. Cotta Ramusino, A. A. Maier, Luca Fiorini, I. Mannelli, A. Ceccucci, Andrea Bizzeti, C. Damiani, A. I. Zinchenko, P. Rubin, M. D. Wood, M. Sozzi, C. Cheshkov, E. Imbergamo, Massimiliano Fiorini, Nicolo Cartiglia, A. Peters, S. A. Wotton, Manfred Jeitler, S. Balev, M. Martini, H. D. Wahl, M. Fidecaro, A. Gianoli, Ivan Mikulec, N. Doble, U. Moosbrugger, Stoyan Stoynev, B. Peyaud, L. DiLella, Lau Gatignon, Nicola Cabibbo, W. Kubischta, M. Scarpa, G. Anzivino, M. Savrie, P. Cenci, G. Lamanna, B. Bloch-Devaux, D. J. Munday, M. Veltri, A. Dabrowski, S. Goy Lopez, G.E. Kalmus, M. Shieh, M. C. Petrucci, J. Derre, A. Norton, Roland Winston, M. De Beer, Roberta Arcidiacono, C. Cerri, M. Wache, D. T. Madigozhin, S. Giudici, M. Behler, E. Marinova, P. Marouelli, G. Neuhofer, E. Mazzucato, P. F. Dalpiaz, Konrad Kleinknecht, W. Baldini, D.C. Cundy, M. Pepe, V. Falaleev, C. Morales Morales, D. Coward, Mayda Velasco, M. Valdata-Nappi, Marco Clemencic, S. Venditti, M. Markytan, M. Lenti, Maulik R. Patel, F. Marchetto, L. Widhalm, G. Ruggiero, A. Gonidec, G. Collazuol, G. Marel, Rainer Wanke, A. J. Culling, E. C. Swallow, Fabrizio Petrucci, Leander Litov, Alan W. Walker, N. A. Molokanova, K. Eppard, Evgueni Goudzovski, Lucia Masetti, E. Iacopini, R. Fantechi, Milene Calvetti, H. Dibon, Mauro Raggi, M. Ziolkowski, G. Bocquet, Yu. Potrebenikov, and V. Kozhuharov
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,010308 nuclear & particles physics ,Scattering ,Monte Carlo method ,Dalitz plot ,01 natural sciences ,Pion ,Isospin ,0103 physical sciences ,Quasinormal mode ,High Energy Physics::Experiment ,Invariant mass ,Anomaly (physics) ,Nuclear Experiment ,010306 general physics - Abstract
As first observed by the NA48/2 experiment at the CERN SPS, the π0π0 invariant mass (M00) distribution from K±→π±π0π0 decay shows a cusp-like anomaly at M00=2m+, where m+ is the charged pion mass. An analysis to extract the ππ scattering lengths in the isospin I=0 and I=2 states, a0 and a2, respectively, has been recently reported. In the present work the Dalitz plot of this decay is fitted to a new empirical parameterization suitable for practical purposes, such as Monte Carlo simulations of K±→π±π0π0 decays.
- Published
- 2010
18. Measurement of the polarization of the Ξ0 (Ξ0¯) hyperon beam by the NA48/1 experiment
- Author
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M. Sozzi, C. Morales Morales, S. A. Wotton, W. Kubischta, G. Neuhofer, Cristina Biino, U. Moosbrugger, Ivan Mikulec, Niels Doble, D. J. Munday, Mayda Velasco, Rainer Wanke, A. Gonidec, P. Debu, D.C. Cundy, Marco Clemencic, A. Maier, Leander Litov, M. De Beer, E. Iacopini, Jacqueline Batley, G. Collazuol, H. D. Wahl, P.L. Frabetti, Nadia Pastrone, P. Grafström, Nicolo Cartiglia, G. Pierazzini, E. C. Swallow, D. T. Madigozhin, U. Koch, A. Winhart, Evgueni Goudzovski, T. Fonseca Martin, Mauro Piccini, B. Peyaud, P. Rubin, E. Mazzucato, Alan W. Walker, A. Peters, M. Eppard, R. Fantechi, Vladimir Kekelidze, Mark Slater, M. Markytan, M. Lenti, N. A. Molokanova, M. Holder, M. Martini, F. Petrucci, K. Eppard, Konrad Kleinknecht, M. Behler, E. Imbergamo, V. Falaleev, H. Dibon, A. I. Zinchenko, M. Savrie, R. Sacco, B. Panzer-Steindel, G. Bocquet, Yu. Potrebenikov, A. Gianoli, F. Costantini, G. Marel, F. Marchetto, M. Patel, Michael Ziolkowski, A. Michetti, L. Widhalm, M. Scarpa, M. Valdata, A. Dabrowski, W. Wislicki, M. C. Petrucci, A. Hirstius, S. Stoynev, E. Menichetti, G. Lamanna, E. Monnier, G. Ruggiero, C. Cheshkov, M. Pepe, G.E. Kalmus, C. Lazzeroni, P. Lubrano, A. Nappi, C. Cerri, A. Ceccucci, Andrea Bizzeti, Manfred Jeitler, G. Anzivino, I. Mannelli, G. Gouge, L. Fiorini, L. Masetti, S. Giudici, B. Vallage, P. F. Dalpiaz, J.B. Cheze, P. Hristov, Roberta Arcidiacono, M. Calvetti, Lau Gatignon, P. Cenci, M. Veltri, S. Goy Lopez, A. Norton, Roland Winston, P. Marouelli, and W. Baldini
- Subjects
Physics ,Nuclear and High Energy Physics ,Meson ,Proton ,010308 nuclear & particles physics ,Hadron ,Hyperon ,7. Clean energy ,01 natural sciences ,Xi baryon ,Nuclear physics ,Baryon ,Pion ,0103 physical sciences ,010306 general physics ,Nucleon - Abstract
A total of 368 415 Ξ 0 → Λ π 0 and 31 171 Ξ 0 ¯ → Λ ¯ π 0 were selected from data recorded in the NA48/1 experiment during 2002 data taking. From this sample, the polarization of Ξ 0 and Ξ 0 ¯ hyperons was measured to be P Ξ 0 = − 0.102 ± 0.012 (stat) ± 0.008 (syst) and P Ξ 0 ¯ = − 0.01 ± 0.04 (stat) ± 0.008 (syst) . The dependence of P Ξ 0 on the Ξ 0 transverse momentum with respect to the primary proton beam is also presented. With the same data sample, the ratio of Ξ 0 ¯ and Ξ 0 fluxes in proton collisions at 400 GeV / c on a beryllium target was measured.
- Published
- 2009
19. First observation and measurement of the decay K±→π±e+e−γ
- Author
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Rainer Wanke, R. Fantechi, A. Ceccucci, Andrea Bizzeti, Marco Clemencic, F. Costantini, C. Cerri, I. Polenkevich, M. D. Wood, Milene Calvetti, G. Ruggiero, G.M. Pierazzini, J. Derre, I. Mannelli, A. Gonidec, B. Vallage, E. C. Swallow, P. Rubin, Roberta Arcidiacono, H. D. Wahl, M. Fidecaro, Evgueni Goudzovski, N. Doble, H. Dibon, G. Collazuol, S. Balev, M. Martini, R. Winston, B. Peyaud, L. Masetti, D. Coward, Cristina Lazzeroni, J.B. Cheze, M. Scarpa, T. Fonseca Martin, M. Holder, Mauro Raggi, B. Renk, Mauro Piccini, P. Hristov, Luca Fiorini, A.J. Culling, E. Marinova, E. Monnier, G. Neuhofer, D.J. Munday, G. Marel, A. Winhart, Nicola Cabibbo, W. Kubischta, M. Shieh, C. Cheshkov, V. Kozhuharov, D.C. Cundy, S. Stoynev, Nicolo Cartiglia, M. Pepe, Cristina Biino, Ivan Mikulec, Lau Gatignon, M. Savrie, E. Iacopini, A. A. Maier, P. F. Dalpiaz, P. Marouelli, B. Bloch-Devaux, P. Cenci, C. Handel, M. Veltri, F. Marchetto, C. Damiani, M.W. Slater, L. Widhalm, Manfred Jeitler, W. Baldini, G.E. Kalmus, V. Falaleev, A. Zinchenko, M. Ziolkowski, M. De Beer, G. Anzivino, J. R. Batley, A. Peters, S. Goy Lopez, A. Norton, M. Behler, G. Bocquet, Yu. Potrebenikov, A. Nappi, S. Wotton, Vladimir Kekelidze, S. Giudici, M. Sozzi, L. DiLella, M. Wache, Massimiliano Fiorini, D. T. Madigozhin, E. Mazzucato, C. Morales Morales, Mayda Velasco, M. Markytan, M. Lenti, A. Gianoli, Enrico Celeghini, A. Dabrowski, M. C. Petrucci, Maulik R. Patel, Konrad Kleinknecht, M. Valdata-Nappi, F. Martelli, M. Szleper, Simone Bifani, U. Moosbrugger, E. Imbergamo, A. Cotta Ramusino, G. Lamanna, Fabrizio Petrucci, Leander Litov, Alan W. Walker, P. L. Frabetti, A. Michetti, N. A. Molokanova, and K. Eppard
- Subjects
Physics ,Nuclear and High Energy Physics ,Antiparticle ,Chiral perturbation theory ,Meson ,010308 nuclear & particles physics ,Branching fraction ,Hadron ,Analytical chemistry ,01 natural sciences ,Nuclear physics ,Particle decay ,Pion ,0103 physical sciences ,010306 general physics ,Dimensionless quantity - Abstract
Using the full data set of the NA48/2 experiment, the decay K ± → π ± e + e − γ is observed for the first time, selecting 120 candidates with 7.3 ± 1.7 estimated background events. With K ± → π ± π D 0 as normalisation channel, the branching ratio is determined in a model-independent way to be Br ( K ± → π ± e + e − γ , m e e γ > 260 MeV / c 2 ) = ( 1.19 ± 0.12 stat ± 0.04 syst ) × 10 −8 . This measured value and the spectrum of the e + e − γ invariant mass allow a comparison with predictions of chiral perturbation theory.
- Published
- 2008
20. Measurement of the Dalitz plot slope parameters of the K±→π±π+π− decay
- Author
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Enrico Celeghini, P. Marouelli, Leander Litov, A. Dabrowski, S. Giudici, M. C. Petrucci, B. Vallage, M. Sozzi, G. Ruggiero, M. Holder, Michael Ziolkowski, A. Peters, F. Petrucci, Alan W. Walker, E. Imbergamo, M. Savrie, Augusto Ceccucci, G. Bocquet, Yu. Potrebenikov, Cristina Biino, Ivan Mikulec, P. L. Frabetti, Lau Gatignon, S. Stoynev, F. Martelli, J.B. Cheze, M. Lenti, A. Michetti, E. Marinova, I. Mannelli, C. Lazzeroni, F. Costantini, G. Neuhofer, Nicolo Cartiglia, Vladimir Kekelidze, P. Cenci, M. Calvetti, A. Winhart, T. Fonseca Martin, Mauro Piccini, D.C. Cundy, C. Damiani, S. Balev, Marco Clemencic, M. Markytan, M. De Beer, Mark Slater, L. DiLella, M. Fidecaro, N. A. Molokanova, Maulik R. Patel, A. Cotta Ramusino, P. Hristov, S. A. Wotton, B. Peyaud, Evgueni Goudzovski, B. Renk, K. Eppard, Massimiliano Fiorini, V. Falaleev, M. Behler, A. Nappi, J. Derre, G. Lamanna, Nicola Cabibbo, Roberta Arcidiacono, C. Cheshkov, V. Kozhuharov, Andrea Bizzeti, B. Bloch-Devaux, G.E. Kalmus, P. Rubin, N. Doble, I. Polenkevich, Simone Bifani, M. D. Wood, Jacqueline Batley, C. Cerri, M. Veltri, Konrad Kleinknecht, M. Valdata-Nappi, Manfred Jeitler, R. Fantechi, D. Coward, H. Dibon, Wander Baldini, G. Anzivino, Mauro Raggi, G. Pierazzini, G. Marel, E. Iacopini, P. F. Dalpiaz, M. Wache, D. T. Madigozhin, E. Mazzucato, Rainer Wanke, A. J. Culling, E. C. Swallow, C. Morales Morales, H. Wahl, Mayda Velasco, A. I. Zinchenko, A. Gianoli, A. Gonidec, U. Moosbrugger, G. Collazuol, S. Goy Lopez, A. Maier, A. Norton, Roland Winston, W. Kubischta, E. Monnier, L. Fiorini, D. J. Munday, M. Pepe, M. Szleper, F. Marchetto, L. Widhalm, M. Scarpa, M. Martini, M. Shieh, and L. Masetti
- Subjects
Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Dalitz plot ,Particle Data Group ,Atomic physics ,Order of magnitude - Abstract
The distribution of the K ± → π ± π + π − decays in the Dalitz plot has been measured by the NA48/2 experiment at the CERN SPS with a sample of 4.71 × 10 8 fully reconstructed events. With the standard Particle Data Group parameterization the following values of the slope parameters were obtained: g = ( − 21.134 ± 0.017 ) % , h = ( 1.848 ± 0.040 ) % , k = ( − 0.463 ± 0.014 ) % . The quality and statistical accuracy of the data have allowed an improvement in precision by more than an order of magnitude, and are such as to warrant a more elaborate theoretical treatment, including pion–pion rescattering, which is in preparation.
- Published
- 2007
21. Measurement of Kμ30 form factors
- Author
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M. Sozzi, P. Debu, M. Cirilli, G. Fischer, S. A. Wotton, Konrad Kleinknecht, H. D. Wahl, E. Iacopini, H.G. Becker, P. Grafström, P. Lubrano, B. Peyaud, Anton Taurok, M. Eppard, A. Winhart, Nadia Pastrone, Benedetto Gorini, Cristina Biino, Ivan Mikulec, J. C. Chollet, V. Kekelidze, S.A. Schmidt, I.G. Knowles, B. Vallage, Milene Calvetti, Manfred Jeitler, I. Wingerter-Seez, H. Taureg, S. Wronka, H. Fox, R. Turlay, M. Wittgen, A. Lacourt, J. Cogan, A. Kalter, A. Gonidec, M. Markytan, H. Dibon, T.O. White, G. Unal, G. Collazuol, J. Duclos, G. Anzivino, A. Peters, Adrian John Bevan, E. Rondio, J. Ocariz, G. Graziani, G.D. Barr, C. Cheshkov, R. Fantechi, I. Mannelli, L. Gatignon, T.J. Gershon, Roberta Arcidiacono, Andrea Bizzeti, M. Lenti, B. Renk, G. Bocquet, Wojciech Wislicki, B. Panzer-Steindel, D. Madigozhin, R. Casali, M. De Beer, J.B. Cheze, U. Koch, A. Nappi, V. Falaleev, M. Piccini, Michael Ziolkowski, M. Contalbrigo, A. Zinchenko, Alexi Mestvirishvili, Louis Fayard, T. Cuhadar-Dönszelmann, R. Wanke, R.S. Dosanjh, R. Bernhard, N. Doble, L. Widhalm, Cristina Lazzeroni, A. Ceccucci, S. Stoynev, M. Martini, B. Hay, A. Maier, P. Hristov, A. Lai, I. Pellmann, S. Giudici, Andrea Formica, Giuseppe Ruggiero, D.J. Munday, Michal Szleper, A. Norton, J. Nassalski, L. Köpke, C. Cerri, E. Imbergamo, M. Pernicka, M. Savrie, E. Menichetti, F. Costantini, M. Pepe, G.E. Kalmus, G. D'Agostini, G. Govi, Nicolo Cartiglia, P. Cenci, Michael Andrew Parker, W. Kubischta, P. F. Dalpiaz, V. Schönharting, M. Holder, M. Veltri, G.M. Pierazzini, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, L. Bertanza, G. Neuhofer, R. Carosi, D.C. Cundy, Y. Schué, R. Sacco, A. Gianoli, R. Granier de Cassagnac, E. Olaiya, Yu. Potrebenikov, E. Mazzucato, F. Petrucci, Victoria Jane Martin, Mayda Velasco, Sandro Palestini, F. Marchetto, N. A. Molokanova, K. Eppard, Leander Litov, P.L. Frabetti, Alan W. Walker, and D. Marras
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Form factor (quantum field theory) ,Dalitz plot ,NA48 experiment ,010306 general physics ,01 natural sciences - Abstract
This Letter reports on a new high precision measurement of the form factors of the K L → π ± μ ∓ ν μ decay. The data sample of about 2.3 × 10 6 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, λ + ′ = ( 20.5 ± 2.2 stat ± 2.4 syst ) × 10 −3 , and a quadratic, λ + ″ = ( 2.6 ± 0.9 stat ± 1.0 syst ) × 10 −3 term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ 0 = ( 9.5 ± 1.1 stat ± 0.8 syst ) × 10 −3 . Using a linear fit our results were: λ + = ( 26.7 ± 0.6 stat ± 0.8 syst ) × 10 −3 and λ 0 = ( 11.7 ± 0.7 stat ± 1.0 syst ) × 10 −3 . A pole fit of the form factors yields: m V = ( 905 ± 9 stat ± 17 syst ) MeV / c 2 and m S = ( 1400 ± 46 stat ± 53 syst ) MeV / c 2 .
- Published
- 2007
22. Measurement of the ratio Γ(KL→π+π−)/Γ(KL→π±e∓ν) and extraction of the CP violation parameter |η+−
- Author
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P. Debu, T. Cuhadar-Dönszelmann, Sandro Palestini, R.S. Dosanjh, S. A. Wotton, M. Wittgen, Benedetto Gorini, J. Cogan, Rainer Wanke, Manfred Jeitler, P. F. Dalpiaz, H. D. Wahl, T.J. Gershon, A. Gaponenko, J. Duclos, M. Veltri, G. Anzivino, B. Peyaud, Michal Szleper, G.D. Barr, G. Fischer, Anton Taurok, Nadia Pastrone, Vladimir Kekelidze, A. Norton, G.M. Pierazzini, C. Cheshkov, B. Vallage, R. Fantechi, Fabrizio Petrucci, M. Savrie, A. I. Zinchenko, A. Kalter, Konrad Kleinknecht, Nicolo Cartiglia, Michael Andrew Parker, J. C. Chollet, Leander Litov, P.L. Frabetti, E. Menichetti, G.E. Kalmus, A. Peters, V. Schönharting, Milene Calvetti, A. Nappi, J. Ocariz, H. Taureg, I.G. Knowles, H.G. Becker, A. Gianoli, B. Renk, R. Granier de Cassagnac, R. Turlay, M. Pepe, Cristina Biino, Ivan Mikulec, Roberto Guida, Alan W. Walker, D.J. Munday, J. Nassalski, G. D'Agostini, F. Martelli, Augusto Ceccucci, Roberta Arcidiacono, S. Giudici, G. Govi, M. De Beer, P. Lopes da Silva, M. Pernicka, H. Dibon, B. Hay, Andrea Bizzeti, S. Wronka, W. Kubischta, N. A. Molokanova, Lydia Iconomidou-Fayard, P. Marouelli, Louis Fayard, F. Marchetto, G. Graziani, Michael Ziolkowski, K. Eppard, M. Holder, Victoria Jane Martin, U. Koch, D. Marras, A. Winhart, L. Widhalm, I. Mannelli, Mayda Velasco, Alexi Mestvirishvili, M. Eppard, Mauro Piccini, Wojciech Wislicki, P. Lubrano, V. Falaleev, M. Sozzi, S. Stoynev, G. Tatishvili, L. Bertanza, E. Rondio, E. Olaiya, A. Gonidec, D. T. Madigozhin, Lau Gatignon, S.A. Schmidt, M. Cirilli, Cristina Lazzeroni, Niels Doble, G. Collazuol, C. Cerri, A. Tkatchev, I. Pellmann, E. Mazzucato, T.O. White, G. Unal, M. Martini, R. Sacco, M. Markytan, M. Lenti, G. Bocquet, Yu. Potrebenikov, E. Iacopini, P. Cenci, E. Imbergamo, G. Neuhofer, M. Contalbrigo, P. Grafström, I. Wingerter-Seez, A. Maier, P. Hristov, R. Carosi, D.C. Cundy, L. Köpke, A. Lai, Andrea Formica, Adrian John Bevan, Y. Schué, F. Costantini, J.B. Cheze, B. Panzer-Steindel, H. Fox, and A. Lacourt
- Subjects
Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Photon emission ,010308 nuclear & particles physics ,Branching fraction ,0103 physical sciences ,Extraction (chemistry) ,Analytical chemistry ,NA48 experiment ,CP violation ,010306 general physics ,01 natural sciences - Abstract
We present a measurement of the ratio of the decay rates Γ ( K L → π + π − ) / Γ ( K L → π ± e ∓ ν ) , denoted as Γ K 2 π / Γ K e 3 . The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K 2 π and five million K e 3 decays, we find Γ K 2 π / Γ K e 3 = ( 4.835 ± 0.022 stat . ± 0.016 syst . ) × 10 −3 . From this we derive the branching ratio of the CP violating decay K L → π + π − and the CP violation parameter | η + − | . Excluding the CP conserving direct photon emission component K L → π + π − γ , we obtain the results BR ( K L → π + π − ) = ( 1.941 ± 0.019 ) × 10 −3 and | η + − | = ( 2.223 ± 0.012 ) × 10 −3 .
- Published
- 2007
23. Measurement of the branching ratios of the decays Ξ0→Σ+e−ν¯e and Ξ0¯→Σ+¯e+νe
- Author
-
P. F. Dalpiaz, C. Morales Morales, U. Moosbrugger, M. Valdata, B. Panzer-Steindel, R. Fantechi, Konrad Kleinknecht, A. Dabrowski, C. Cheshkov, A. Maier, M. C. Petrucci, Michael Ziolkowski, G.E. Kalmus, M. De Beer, M. Behler, G. Ruggiero, Mayda Velasco, Nicolo Cartiglia, M. Patel, H. Dibon, Wander Baldini, Jacqueline Batley, S. Stoynev, V. Falaleev, Mark Slater, C. Cerri, E. Menichetti, D. T. Madigozhin, Nadia Pastrone, G. Pierazzini, B. Vallage, M. Sozzi, Leander Litov, E. Mazzucato, H. D. Wahl, Evgueni Goudzovski, J.B. Cheze, W. Kubischta, Augusto Ceccucci, P. Debu, P.L. Frabetti, F. Costantini, A. I. Zinchenko, G. Collazuol, D. J. Munday, E. Iacopini, M. Eppard, B. Peyaud, Cristina Biino, Ivan Mikulec, A. Peters, A. Gianoli, M. Holder, P. Grafström, M. Markytan, F. Petrucci, C. Lazzeroni, M. Veltri, Lau Gatignon, M. Savrie, M. Martini, G. Bocquet, Yu. Potrebenikov, Alan W. Walker, I. Mannelli, M. Calvetti, Andrea Bizzeti, Vladimir Kekelidze, A. Winhart, G. Marel, L. Masetti, Rainer Wanke, T. Fonseca Martin, F. Marchetto, A. Michetti, E. C. Swallow, Mauro Piccini, P. Cenci, N. A. Molokanova, K. Eppard, R. Sacco, G. Neuhofer, S. Giudici, D.C. Cundy, M. Lenti, P. Hristov, S. A. Wotton, U. Koch, Niels Doble, G. Lamanna, Marco Clemencic, E. Imbergamo, Roberta Arcidiacono, P. Rubin, S. Goy Lopez, A. Norton, Roland Winston, E. Monnier, L. Fiorini, M. Pepe, A. Gonidec, L. Widhalm, M. Scarpa, W. Wislicki, P. Marouelli, Manfred Jeitler, G. Anzivino, G. Gouge, P. Lubrano, A. Nappi, and A. Hirstius
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Cabibbo–Kobayashi–Maskawa matrix ,0103 physical sciences ,Sigma ,Particle Data Group ,010306 general physics ,Branching (polymer chemistry) ,01 natural sciences - Abstract
From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Ξ 0 → Σ + e − ν ¯ e candidates (with the subsequent Σ + → p π 0 decay) and 555 Ξ 0 ¯ → Σ + ¯ e + ν e candidates with background contamination of 215 ± 44 and 136 ± 8 events, respectively. From these samples, the branching ratios BR ( Ξ 0 → Σ + e − ν ¯ e ) = ( 2.51 ± 0.03 stat ± 0.09 syst ) × 10 −4 and BR ( Ξ 0 ¯ → Σ + ¯ e + ν e ) = ( 2.55 ± 0.14 stat ± 0.10 syst ) × 10 −4 were measured allowing the determination of the CKM matrix element | V us | = 0.209 −0.028 +0.023 . Using the Particle Data Group average for | V us | obtained in semileptonic kaon decays, we measured the ratio g 1 / f 1 = 1.20 ± 0.05 of the axial-vector to vector form factors.
- Published
- 2007
24. Observation of a cusp-like structure in the π0π0 invariant mass distribution from K±→π±π0π0 decay and determination of the ππ scattering lengths
- Author
-
J.R. Batley, 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, M. Patel, A. Peters, S. Balev, P.L. Frabetti, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, E. Marinova, 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. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, F. Martelli, G. Ruggiero, M. Veltri, 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, G. Anzivino, P. Cenci, E. Imbergamo, M. Pepe, M.C. Petrucci, M. Piccini, M. Raggi, M. Valdata-Nappi, C. Cerri, G. Collazuol, F. Costantini, L. DiLella, N. Doble, R. Fantechi, L. Fiorini, S. Giudici, G. Lamanna, I. Mannelli, A. Michetti, G. Pierazzini, M. Sozzi, B. Bloch-Devaux, C. Cheshkov, J.B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, S. Bifani, C. Biino, N. Cartiglia, M. Clemencic, S. Goy Lopez, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm
- Subjects
Cusp (singularity) ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Pion ,Distribution (mathematics) ,Scattering ,Isospin ,Pi ,Invariant mass ,Anomaly (physics) - Abstract
We report the results from a study of ~23 Million K+- ==> pi+- pizero pizero decays recorded by the NA48/2 experiment at the CERN SPS, showing an anomaly in the pizero pizero invariant mass distribution in the region around 2m+, where m+ is the charged pion mass. This anomaly, never observed in previous experiments, can be interpreted as an effect due mainly to the final state charge exchange scattering process pi+ pi- ==> pizero pizero in K+- ==> pi+- pi+ pi- decay. It provides a precise determination of a0 - a2, the difference between the pi-pi scattering lengths in the isospin I=0 and I=2 states.
- Published
- 2006
25. A measurement of the CP-conserving component of the decay KS0→π+π−π0
- Author
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Konrad Kleinknecht, G.M. Pierazzini, P. F. Dalpiaz, Augusto Ceccucci, W. Wislicki, L. Widhalm, Rainer Wanke, P. Debu, C. Cerri, M. Patel, W. Kubischta, S. A. Wotton, A. I. Zinchenko, Nadia Pastrone, N. A. Molokanova, U. Moosbrugger, A. Gianoli, B. Vallage, G. Graziani, K. Eppard, C. Cheshkov, M. Holder, G. Bocquet, Yu. Potrebenikov, E. C. Swallow, A. Peters, G. Ruggiero, Marco Clemencic, M. Wache, D.J. Munday, Andrea Bizzeti, P. Rubin, Roberta Arcidiacono, L. Masetti, M. Savrie, D. T. Madigozhin, A. Gonidec, V. Falaleev, Michael Ziolkowski, Nicolo Cartiglia, E. Menichetti, R. Sacco, G. Collazuol, E. Mazzucato, Cristina Lazzeroni, S. Stoynev, G. Neuhofer, P. Marouelli, E. Monnier, F. Marchetto, M. De Beer, I. Mannelli, D.C. Cundy, J.B. Cheze, A. Michetti, C. Morales Morales, S. Giudici, B. Panzer-Steindel, M. Pepe, M. Martini, Fabrizio Petrucci, Luca Fiorini, A. Maier, H. D. Wahl, P. Hristov, F. Costantini, M. Scarpa, Leander Litov, Manfred Jeitler, B. Peyaud, M. Behler, M. Veltri, P.L. Frabetti, M. Sozzi, S. Goy Lopez, Mayda Velasco, G. Marel, A. Norton, Roland Winston, G. Anzivino, Alan W. Walker, G. Gouge, D. Gurev, M. Eppard, Niels Doble, A. Hirstius, Evgueni Goudzovski, Lau Gatignon, A. Nappi, P. Cenci, Cristina Biino, Ivan Mikulec, M. Valdata, F. Martelli, Vladimir Kekelidze, E. Iacopini, P. Grafström, R. Fantechi, Milene Calvetti, H. Dibon, Wander Baldini, U. Koch, A. Winhart, T. Fonseca Martin, Mauro Piccini, M.W. Slater, J. R. Batley, M. Markytan, M. Lenti, A. Dabrowski, M. C. Petrucci, G. Lamanna, P. Lubrano, and E. Imbergamo
- Subjects
Physics ,Nuclear and High Energy Physics ,Angular momentum ,Amplitude ,Chiral perturbation theory ,010308 nuclear & particles physics ,Component (thermodynamics) ,Quantum mechanics ,0103 physical sciences ,Pi ,Perturbation theory ,010306 general physics ,01 natural sciences - Abstract
The NA48 Collaboration has measured the amplitude of the CP-conserving component of the decay K S 0 → π + π − π 0 relative to K L 0 → π + π − π 0 . For the characteristic parameter λ , the values Re λ = 0.038 ± 0.010 and Im λ = − 0.013 ± 0.007 have been extracted. These values agree with earlier measurements and with theoretical predictions from chiral perturbation theory.
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- 2005
26. Measurement of the KL→e+e−e+e− decay rate
- Author
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M. Wittgen, Rainer Wanke, J. Cogan, T. Çuhadar, J. C. Chollet, U. Koch, M. Markytan, M. Lenti, I.G. Knowles, A. Winhart, G. Tatishvili, Mauro Piccini, S. Giudici, R. Fantechi, S. Wronka, I. Wingerter-Seez, Milene Calvetti, Nicolo Cartiglia, R.S. Dosanjh, Michael Andrew Parker, G.M. Pierazzini, G. Govi, N. A. Molokanova, A. Kalter, M. Eppard, H. D. Wahl, P. Lubrano, Adrian John Bevan, T.O. White, W. Kubischta, B. Hay, G. Unal, Vladimir Kekelidze, K. Eppard, H. Dibon, I. Mannelli, S.A. Schmidt, E. Rondio, B. Peyaud, V. Schönharting, Roberta Arcidiacono, E. Imbergamo, G. Graziani, P. F. Dalpiaz, Fabrizio Petrucci, Nadia Pastrone, R. Casali, H. Taureg, R. Turlay, D. Marras, Augusto Ceccucci, P.L. Frabetti, B. Vallage, M. Contalbrigo, I. Melzer-Pellmann, Alexi Mestvirishvili, J. Ocariz, T.J. Gershon, M. Sozzi, Benedetto Gorini, C. Cheshkov, A. I. Zinchenko, Louis Fayard, J.B. Cheze, F. Marchetto, B. Renk, V. Falaleev, Manfred Jeitler, H.G. Becker, Alan W. Walker, A. Gianoli, Sandro Palestini, E. Iacopini, A. Maier, P. Hristov, J. Duclos, G. Anzivino, M. Cirilli, Niels Doble, Andrea Bizzeti, Cristina Biino, Ivan Mikulec, A. Peters, Konrad Kleinknecht, Luca Fiorini, R. Granier de Cassagnac, G. Neuhofer, P. Grafström, G. Bocquet, Yu. Potrebenikov, Michael Ziolkowski, G.D. Barr, D.C. Cundy, G. Lamanna, D. Madigojine, M. Holder, C. Cerri, L. Widhalm, M. Pernicka, L. Köpke, Victoria Jane Martin, Y. Schué, A. Lai, Andrea Formica, Mayda Velasco, P. Debu, E. Olaiya, Lau Gatignon, F. Costantini, G. Ruggiero, A. Nappi, E. Mazzucato, S. A. Wotton, R. Sacco, Michal Szleper, Wojciech Wislicki, A. Gonidec, Cristina Lazzeroni, M. Savrie, P. Cenci, G. Collazuol, G. Fischer, E. Menichetti, Anton Taurok, G.E. Kalmus, M. De Beer, M. Martini, M. Pepe, G. D'Agostini, M.D. Needham, A. Norton, D.J. Munday, J. Nassalski, H. Fox, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, A. Lacourt, and B. Panzer-Steindel
- Subjects
Physics ,Nuclear and High Energy Physics ,Meson ,Branching fraction ,Analytical chemistry ,Atomic physics ,Positron annihilation - Abstract
The decay rate of the long-lived neutral K meson into the e + e − e + e − final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br ( K L → e + e − e + e − ) = ( 3.30 ± 0.24 stat ± 0.23 syst ± 0.10 norm ) × 10 −8 .
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- 2005
27. Search for CP violation in K0→3π0 decays
- Author
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Konrad Kleinknecht, M. Holder, G. Graziani, W. Wislicki, A. Gonidec, M. Wittgen, E. Rondio, Andrea Bizzeti, J. C. Chollet, G. Collazuol, J. Nassalski, P. F. Dalpiaz, V. Falaleev, D. Madigojine, P. Lopes da Silva, Nadia Pastrone, R. Fantechi, I. Pellmann, Benedetto Gorini, G. Bocquet, Yu. Potrebenikov, T.J. Gershon, S. Giudici, T. Cuhadar-Dönszelmann, Milene Calvetti, Augusto Ceccucci, Vladimir Kekelidze, Manfred Jeitler, F. Martelli, A. Lai, Andrea Formica, R.S. Dosanjh, F. Derue, M. Martini, G.D. Barr, B. Vallage, G. Neuhofer, M. Markytan, J. Duclos, G. Anzivino, H. D. Wahl, Lydia Iconomidou-Fayard, M. Lenti, N. A. Molokanova, K. Eppard, P. Marouelli, C. Cerri, D.C. Cundy, G. Gouge, R. Turlay, H. Dibon, G. Marel, B. Peyaud, F. Costantini, Rainer Wanke, U. Koch, A. Peters, Y. Schué, M. Pepe, P. Debu, A. Winhart, C. Cheshkov, Fabrizio Petrucci, Mauro Piccini, G.M. Pierazzini, T.O. White, G. Unal, S. A. Wotton, P. Lubrano, W. Kubischta, B. Panzer-Steindel, P. Rubin, S.A. Schmidt, S. Wronka, Alexi Mestvirishvili, P.L. Frabetti, Nicolo Cartiglia, Michael Ziolkowski, E. Imbergamo, J.B. Cheze, Michael Andrew Parker, Luca Fiorini, Louis Fayard, F. Marchetto, D. Marras, L. Widhalm, E. Iacopini, Alan W. Walker, V. Schönharting, Cristina Biino, Ivan Mikulec, I. Wingerter-Seez, P. Grafström, M. Sozzi, G. Tatishvili, A. Nappi, M. Eppard, J. R. Batley, Massimiliano Fiorini, M. Cirilli, Niels Doble, Michal Szleper, R. Sacco, A. Lacourt, M. Savrie, E. Menichetti, G.E. Kalmus, M. De Beer, Roberta Arcidiacono, R. Casali, M. Veltri, Lau Gatignon, A. Norton, P. Cenci, M. Contalbrigo, A. Maier, P. Hristov, L. Köpke, D.J. Munday, Victoria Jane Martin, E. Olaiya, Cristina Lazzeroni, E. Mazzucato, A. I. Zinchenko, M. Pernicka, A. Gianoli, R. Granier de Cassagnac, A. Hirstius, Anton Taurok, I. Mestvirishvili, and I. Mannelli
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Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Amplitude ,010308 nuclear & particles physics ,Branching fraction ,0103 physical sciences ,Pi ,CP violation ,010306 general physics ,Lifetime distribution ,01 natural sciences - Abstract
Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K S → 3 π 0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K 0 / K ¯ 0 → 3 π 0 decays, the CP violating amplitude η 000 = A ( K S → 3 π 0 ) / A ( K L → 3 π 0 ) has been found to be Re ( η 000 ) = − 0.002 ± 0.011 ± 0.015 and Im ( η 000 ) = − 0.003 ± 0.013 ± 0.017 . This corresponds to an upper limit on the branching fraction of Br ( K S → 3 π 0 ) 7.4 × 10 −7 at 90% confidence level. The result is used to improve knowledge of Re ( e ) and the CPT violating quantity Im ( δ ) via the Bell–Steinberger relation.
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- 2005
28. Measurement of the branching ratio of the decay and extraction of the CKM parameter
- Author
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A. Lai, D. Marras, A. Bevan, R.S. Dosanjh, T.J. Gershon, B. Hay, G.E. Kalmus, C. Lazzeroni, D.J. Munday, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, A. Norton, S. Palestini, B. Panzer-Steindel, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, A. Gaponenko, P. Hristov, V. Kekelidze, L. Litov, D. Madigojine, N. Molokanova, Yu. Potrebenikov, S. Stoynev, G. Tatishvili, A. Tkatchev, A. Zinchenko, I. Knowles, V. Martin, R. Sacco, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Lenti, F. Martelli, M. Veltri, H.G. Becker, K. Eppard, M. Eppard, H. Fox, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Marouelli, I. Pellmann, A. Peters, B. Renk, S.A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J.C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, G. Lamanna, I. Mannelli, G. Pierazzini, M. Sozzi, J.B. Cheze, J. Cogan, M. De Beer, P. Debu, A. Formica, R. Granier de Cassagnac, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, R. Guida, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, G. Fischer, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, M. Pernicka, A. Taurok, and L. Widhalm
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Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Cabibbo–Kobayashi–Maskawa matrix ,Branching fraction ,Coupling parameter ,Extraction (chemistry) ,Form factor (quantum field theory) ,Measure (mathematics) - Abstract
We present a new measurement of the branching ratio R of the decay K L → π ± e ∓ ν , denoted as K e 3 , relative to all charged K L decays with two tracks, based on data taken with the NA48 detector at the CERN SPS. We measure R = 0.4978 ± 0.0035 . From this we derive the K e 3 branching fraction and the weak coupling parameter | V u s | in the CKM matrix. We obtain | V u s | f + ( 0 ) = 0.2146 ± 0.0016 , where f + ( 0 ) is the vector form factor in the K e 3 decay.
- Published
- 2004
29. Observation of the rare decay KS→π0μ+μ−
- Author
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S Goy-Lopez, G. Kalmus, Cristina Biino, Nadia Pastrone, Ivan Mikulec, M. Markytan, M. Lenti, A. Peters, P. Rubin, Mauro Piccini, T. Fonseca Martin, C. Cerri, M. Valdata, Peter Zahariev Hristov, G. Ruggiero, Vladimir Kekelidze, Marco Clemencic, A. Gonidec, E. Iacopini, G. Collazuol, N. Doble, R. Sacco, A.I. Zinchenko, P. Grafström, M. Holder, P. Lubrano, M. C. Petrucci, G. Bocquet, Yu. Potrebenikov, Roberta Arcidiacono, R. Fantechi, G.M. Pierazzini, U. Koch, Milene Calvetti, E. Imbergamo, E. Monnier, H. Dibon, Wander Baldini, H. D. Wahl, Mayda Velasco, L. Gatignon, G. Neuhofer, Nicolo Cartiglia, Cristina Lazzeroni, Anne Dabrowski, M. Pepe, Cvetan Valeriev Cheshkov, Manfred Jeitler, D.C. Cundy, P. F. Dalpiaz, J.B. Cheze, F. Costantini, M. Ziolkowski, A. Gianoli, B. Peyaud, N. A. Molokanova, Luca Fiorini, J. Duclos, K. Eppard, G. Anzivino, G. Lamanna, V. Kozhuharov, F. Marchetto, D. T. Madigozhin, L. Widhalm, E. Mazzucato, W. Wislicki, G. Gouge, I. Mannelli, A. A. Maier, M. W. Slater, L. Masetti, S. Giudici, A. Hirstius, G. Marel, Rainer Wanke, Fabrizio Petrucci, P. Cenci, Leander Litov, Jacqueline Batley, U. Moosbrugger, P.L. Frabetti, B. Vallage, Alan W. Walker, Evgueni Goudzovski, M. Sozzi, Michal Szleper, A. Michetti, S. A. Wotton, M. Savrie, D. Gurev, E. Menichetti, A. Ceccucci, Andrea Bizzeti, A. Nappi, M. De Beer, B. Panzer-Steindel, M. Behler, M. Scarpa, M. Martini, G. Graziani, V. Falaleev, A. Winhart, E. C. Swallow, P. Marouelli, C. Morales Morales, P. Debu, Stoyan Stoynev, W. Kubischta, M. Eppard, D. J. Munday, M. Veltri, A. Norton, Roland Winston, Maulik R. Patel, F. Martelli, and Konrad Kleinknecht
- Subjects
mesoni K ,decadimenti rari ,Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,010308 nuclear & particles physics ,Branching fraction ,Form factor (quantum field theory) ,01 natural sciences ,Nuclear physics ,0103 physical sciences ,Pi ,CP violation ,Matrix element ,010306 general physics - Abstract
A search for the decay KS→π0μ+μ−KS→π0μ+μ− has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity KSKS beam. Six events were found with a background expectation of 0.22−0.11+0.18 events. Using a vector matrix element and unit form factor, the measured branching ratio is B(KS→π0μ+μ−)=[2.9−1.2+1.5(stat)±0.2(syst)]×10−9.
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- 2004
30. Measurement of the Ξ0→Λγ decay asymmetry and branching fraction
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G. Tatishvili, Lau Gatignon, D. Marras, A. Tkatchev, M. Sozzi, Benedetto Gorini, P. Cenci, M. Cirilli, Niels Doble, G. Govi, M. De Beer, Manfred Jeitler, M. Holder, A. Kalter, Roberta Arcidiacono, R. Casali, W. Kubischta, M. Contalbrigo, E. Olaiya, J. Duclos, A. Winhart, P. Debu, A. Maier, G. Anzivino, P. Hristov, Mauro Piccini, L. Köpke, P. F. Dalpiaz, I. Wingerter-Seez, T.O. White, G. Unal, S. A. Wotton, Rainer Wanke, Nadia Pastrone, C. Cheshkov, E. Mazzucato, T.J. Gershon, Adrian John Bevan, A. Gaponenko, G.D. Barr, H. Fox, R. Turlay, B. Vallage, M. Markytan, M. Lenti, M. Pepe, G. D'Agostini, Nicolo Cartiglia, A. I. Zinchenko, A. Lacourt, Michael Andrew Parker, F. Martelli, E. Rondio, J. C. Chollet, M. Martini, I.G. Knowles, Alexi Mestvirishvili, Augusto Ceccucci, E. Iacopini, J.B. Cheze, A. Peters, D. Madigojine, S. Giudici, A. Gianoli, N. A. Molokanova, T. Cuhadar-Dönszelmann, K. Eppard, P. Grafström, A. Nappi, A. Gonidec, R. Granier de Cassagnac, Roberto Guida, G.M. Pierazzini, R.S. Dosanjh, G. Collazuol, Konrad Kleinknecht, H.G. Becker, Cristina Biino, Ivan Mikulec, S. Wronka, V. Schönharting, G. Graziani, R. Fantechi, M. Wittgen, Michal Szleper, B. Hay, J. Cogan, V. Falaleev, I. Pellmann, Milene Calvetti, M. Savrie, H. Dibon, P. Lubrano, B. Panzer-Steindel, S.A. Schmidt, E. Menichetti, G. Neuhofer, Sandro Palestini, G.E. Kalmus, Louis Fayard, R. Carosi, F. Marchetto, D.C. Cundy, Vladimir Kekelidze, L. Widhalm, A. Lai, Andrea Formica, Y. Schué, E. Imbergamo, F. Costantini, Victoria Jane Martin, M. Eppard, R. Sacco, G. Bocquet, Yu. Potrebenikov, U. Koch, Mayda Velasco, M. Veltri, A. Norton, G. Fischer, Anton Taurok, D.J. Munday, J. Nassalski, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, L. Bertanza, M. Pernicka, Wojciech Wislicki, J. Ocariz, B. Renk, Cristina Lazzeroni, H. D. Wahl, B. Peyaud, I. Mannelli, Michael Ziolkowski, H. Taureg, Andrea Bizzeti, C. Cerri, Fabrizio Petrucci, P.L. Frabetti, and Alan W. Walker
- Subjects
Physics ,Particle physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,Branching fraction ,media_common.quotation_subject ,iperoni Xi0 ,Hyperon ,Radiative decay ,NA48 experiment ,Asymmetry ,Nuclear physics ,decadimenti radiativi ,Radiative transfer ,media_common - Abstract
In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Ξ0→Λγ have been found with an estimated background of 58±8 events. From these events the Ξ0→Λγ decay asymmetry has been determined to α(Ξ0→Λγ)=-0.78±0.18stat±0.06 syst, which is the first evidence of a decay asymmetry in Ξ 0→Λγ. The branching fraction of the decay has been measured to be Br(Ξ0→Λγ)=(1.16±0.05 stat±0.06syst)×10-3. © 2004 Elsevier B.V. All rights reserved.
- Published
- 2004
- Full Text
- View/download PDF
31. A Time-of-Flight detector in CDF-II
- Author
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D. Acosta, M. Ahn, K. Anikeev, G. Bauer, G. Bellettini, S. Cabrera, C. Cerri, S. Dececco, D. Depedis, A. DiGirolamo, C. Dionisi, J. Fernandez, I.K. Furic, C. Chen, I. Cho, S. Giagu, G. Gomez, C. Grozis, M. Jones, H. Kaneko, A. Kazama, R. Kephart, D.H. Kim, B.J. Kim, M.S. Kim, S. Kim, S.B. Kim, Y.K. Kim, J. Konigsberg, W. Kononenko, A. Korn, I. Kravchenko, J. Kroll, J. Lee, J. Lewis, A. Madorsky, G.M. Mayers, A. Menzione, M. Mulhearn, F.M. Newcomer, Y. Oh, R.G.C. Oldeman, Ch. Paus, S. Pavlon, J. Piedra, M. Rescigno, T. Rodrigo, A. Ruiz, K. Sato, R. Stanek, K. Sumorok, F. Ukegawa, D. Usynin, R. Van Berg, E. Vataga, G. Veramendi, I. Vila, R. Vilar, I. Yu, and L. Zanello
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Physics ,Nuclear and High Energy Physics ,Particle physics ,Time of flight detector ,Physics::Instrumentation and Detectors ,High Energy Physics::Phenomenology ,Detector ,cdf ,particle id ,tau ,trigger ,Tevatron ,Cosmic ray ,Scintillator ,law.invention ,Nuclear physics ,law ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,B meson ,Nuclear Experiment ,Collider ,Instrumentation ,Collider Detector at Fermilab - Abstract
A Time-of-Flight (TOF) detector, based on plastic scintillators and fine-mesh photomultipliers, has been added to the Collider Detector at Fermilab (CDF)-II experiment at the Tevatron pp collider. The primary physics motivation is to provide charged kaon identification to improve neutral B meson flavor determination. Besides that, the TOF detector found application in the CDF trigger system in implementation of highly ionizing particle, high multiplicity and cosmic rays triggers.
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- 2004
32. Observation of the decay KS→π+π−e+e−
- Author
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C. Cheshkov, U. Koch, G. Govi, W. Kubischta, E. Iacopini, P. Grafström, G. Bocquet, Yu. Potrebenikov, Nadia Pastrone, A. Winhart, A. Lai, Mauro Piccini, B. Vallage, P. Debu, R. Fantechi, Andrea Formica, Lydia Iconomidou-Fayard, Milene Calvetti, J. C. Chollet, I. Mannelli, A. Nappi, M. Eppard, I.G. Knowles, Michal Szleper, M. Savrie, E. Menichetti, R.S. Dosanjh, F. Costantini, G.E. Kalmus, Sandro Palestini, M. De Beer, P. Lubrano, H. Dibon, S. Giudici, Giacomo Graziani, A. Peters, S. Wronka, M. Wittgen, M. Holder, Benedetto Gorini, S.A. Schmidt, D. Marras, R. Turlay, S. A. Wotton, M. Contalbrigo, K. Holtz, J. Cogan, Manfred Jeitler, M. Sozzi, M. Bender, G.D. Barr, Wojciech Wislicki, E. Imbergamo, H. D. Wahl, E. Olaiya, J. Duclos, D.J. Munday, G. Anzivino, J. Nassalski, Michael Andrew Parker, M. Cirilli, N. A. Molokanova, J. Ocariz, Niels Doble, B. Renk, P. F. Dalpiaz, P. Hristov, E. Rondio, I. Pellmann, E. Mazzucato, I. Augustin, G. Fischer, M. Pepe, G. D'Agostini, T.O. White, G. Unal, T.J. Gershon, M.D. Needham, B. Peyaud, Anton Taurok, B. Hay, R. Sacco, Fabrizio Petrucci, L. Köpke, A. Gonidec, Augusto Ceccucci, V. Schönharting, M. Markytan, M. Lenti, P.L. Frabetti, G. Collazuol, J.B. Cheze, Vladimir Kekelidze, Victoria Jane Martin, G.M. Pierazzini, G. Tatishvili, Lau Gatignon, Mayda Velasco, Michael Ziolkowski, A. Mestvirishvili, A. Tkatchev, M. Martini, H. Parsons, Louis Fayard, F. Marchetto, Alan W. Walker, A. I. Zinchenko, Konrad Kleinknecht, P. Cenci, H. Taureg, H.G. Becker, H. Blümer, A. Gianoli, C. Lazzeroni, A. Kalter, R. Granier de Cassagnac, Cristina Biino, Ivan Mikulec, G. Neuhofer, S. Crépé, V. Falaleev, R. Carosi, D. Madigojine, Luciano Musa, M. Pernicka, Roberta Arcidiacono, D.C. Cundy, Andrea Bizzeti, R. Casali, A. Norton, Y. Schué, B. Panzer-Steindel, H. Fox, A. Lacourt, C. Cerri, I. Wingerter-Seez, and Adrian John Bevan
- Subjects
mesoni K ,decadimenti rari ,Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Branching fraction ,Bremsstrahlung ,NA48 experiment - Abstract
We present the first observation of the decay KS→π+π−e+e− based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL→π+π−π0D decays as normalization sample, the branching ratio is measured to be BR(KS→π+π−e+e−)=[4.5±0.7(stat)±0.4(syst)]×10−5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.
- Published
- 2000
33. Measurement of the decay rate and form factor parameter in the decay KL→e+e−γ
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H.G. Becker, Cristina Biino, Ivan Mikulec, Vladimir Kekelidze, R. Turlay, M. Holder, D. Marras, G. Fischer, A. Gonidec, A. I. Zinchenko, Michael Ziolkowski, S. Luitz, I. Potrebenikov, Anton Taurok, G. Collazuol, M. Sozzi, S. A. Wotton, E. Iacopini, G. Govi, Konrad Kleinknecht, S. Schanne, A. Gianoli, Paolo Calafiura, Matthew Needham, B. Vallage, P. Grafström, R.W. Moore, I. Mannelli, J. Nassalski, R. Granier de Cassagnac, A. Lai, Andrea Formica, G. Kesseler, J.B. Cheze, M. Cirilli, Niels Doble, W. Kubischta, Michal Szleper, O. Boyle, P. F. Dalpiaz, A. Nappi, P. Hristov, P. Lubrano, P. Debu, R. Fantechi, H. D. Wahl, Giacomo Graziani, A. Mestvirishvili, M. Savrie, U. Koch, A. Winhart, Louis Fayard, G. Neuhofer, F. Marchetto, J. C. Chollet, F. Costantini, D. J. Munday, Milene Calvetti, H. Blümer, L. Köpke, M. Bender, I.G. Knowles, P. Buchholz, E. Menichetti, A. Kalter, B. Peyaud, M. Martini, Lydia Iconomidou-Fayard, D. Schinzel, J. Scheidt, B. Hay, Victoria Jane Martin, W. Wislicki, Michael Andrew Parker, S. Giudici, M. De Beer, E. Rondio, H. Dibon, J. Ocariz, Roberta Arcidiacono, G.D. Barr, H. Taureg, B. Renk, Augusto Ceccucci, S. Wronka, Mayda Velasco, V. Fanti, I. Wingerter, V. Schönharting, G. Tatishvili, O. Vossnack, Lau Gatignon, Benedetto Gorini, G. Unal, M. Porcu, A. Tkatchev, M. Pepe, D. Coward, Manfred Jeitler, J.P. Matheys, C. Cerri, J. Schmidt, Luciano Musa, G. Bocquet, I. Augustin, K.N. Moore, J. Duclos, Andrea Bizzeti, P. Cenci, J. Bremer, G. Anzivino, A. Norton, M. Pernicka, C. Ebersberger, G. Wirrer, D. Vattolo, S. Crépé, E. Mazzucato, M. Markytan, M. Lenti, H. Fox, A. Lacourt, R. Wilhelm, B. Panzer-Steindel, Fabrizio Petrucci, P.L. Frabetti, T. O. White, H. Parsons, Sandro Palestini, A. Michetti, Wolfgang Funk, R. Carosi, D.C. Cundy, Y. Schué, G.M. Pierazzini, M. Wittgen, and J. Cogan
- Subjects
Pseudoscalar ,Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Amplitude ,Meson ,Branching fraction ,Form factor (quantum field theory) ,Alpha (ethology) ,Relative strength - Abstract
The decay rate of the neutral K meson KL→e+e−γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL→e+e−γ)/Γ(KL→all) = (1.06±0.02stat±0.02sys±0.04calc)×10−5. The parameter α K ∗ describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be α K ∗ =−0.36±0.06stat±0.02sys.
- Published
- 1999
34. Search for the decay KL → 3γ
- Author
-
R. Heinz, Laurent Serin, I. Mannelli, M. Rost, J. Staeck, A. Kreutz, R. Hagelberg, J. Scheidt, H. G. Sander, F. Leber, B. Renk, H. Blümer, Ken Peach, N. Doble, D.C. Cundy, G.D. Barr, Konrad Kleinknecht, V.M. Marzulli, Paolo Calafiura, M. Holder, E. Augé, R. Carosi, R. Casali, F. Scheerer, Daniel Fournier, H. Rohrer, G.M. Pierazzini, Peter Buchholz, M. Calvetti, T. Beier, P. Grafström, O. Perdereau, Arthur Schaffer, D. Coward, R. Werthenbach, C. Cerri, L. Gatignon, H. D. Wahl, A. Nappi, A. Wagner, Lydia Iconomidou-Fayard, and L. Bertanza
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Distribution (mathematics) ,Branching fraction - Abstract
Data from the NA31 experiment at the CERN SPS have been used for the first search for the decay mode KL → 3γ. Seven events have been found with an estimated background of 6.7 ± 1.5 events. The corresponding upper limit for the branching ratio is Γ(K L → 3γ) Γ(K L → all ) = 2.4 × 10 −7 at the 90% confidence level, assuming a phase-space decay distribution.
- Published
- 1995
35. A test of chiral perturbation theory from the measurement of the decay KS → γγ
- Author
-
H. G. Sander, A. Nappi, M. Calvetti, M. Rost, P. Grafström, O. Perdereau, Arthur Schaffer, D.C. Cundy, D. Coward, J. Scheidt, A. Kreutz, M. Punturo, Paolo Calafiura, V.M. Marzulli, A. Wagner, I. Mannelli, C. Cerri, T. Beier, R. Hagelberg, F. Leber, M. Holder, G.M. Pierazzini, R. Carosi, H. D. Wahl, Lydia Iconomidou-Fayard, R. Casali, Peter Buchholz, L. Gatignon, B. Renk, G.D. Barr, L. Bertanza, F. Scheerer, N. Doble, Konrad Kleinknecht, Ken Peach, Daniel Fournier, E. Augé, H. Blümer, R. Werthenbach, Laurent Serin, and J. Staeck
- Subjects
Physics ,Nuclear physics ,Systematic error ,Nuclear and High Energy Physics ,Particle physics ,Chiral perturbation theory ,Branching fraction - Abstract
Data from NA31 experiment at CERN have been used to measure the decay KS → γγ. From 69 candidate events of the type K0 → γγ, 52 events can be attributed to KL → γγ and one event is expected from background processes. The ratio of the relative decay widths R = Γ(KS → γγ)Γ(KL → γγ) is measured to be R = 2.2 ± 1.0(stat.) ± 0.3(syst.) ± 0.2(ext.) where the external systematic error is due to the experimental uncertainty in the branching ratio of the decay KL → γγ. This translates into a branching ratio of BR(KS → γγ) = (2.2 ± 1.1) × 10−6. If these data are combined with the published data from an earlier data taking period with the same experiment, the ratio R is determined to be R = 2.35 ± 0.75(stat.) ± 0.4(syst.) + 7.5 · (1 − BR(KL → γγ)5.86 × 10−4) where the last term accounts for the dependence on the measured KL → γγ branching ratio. The corresponding branching ratio for KS → γγ is BR(KS → γγ) = (2.4 ± 0.9) × 10−6. The measurement is a sensitive test of chiral perturbation theory and in good agreement with theoretical predictions.
- Published
- 1995
36. Performance of an electromagnetic liquid krypton calorimeter
- Author
-
D. Schiuma, G. Viehhauser, W. Seidl, D. Schinzel, G. Linser, C. Cerri, P. Lubrano, B. Hallgren, L. Piemontese, A. Lacourt, J. Kekelidze, A. Norton, Sandro Palestini, Benedetto Gorini, C. E. Wulz, M. Markytan, N. Doble, A. Kalinin, P. Cenci, M. Martini, G. Neuhofer, Cristina Biino, A. Gianoli, J. Duclos, D.C. Cundy, H. Taureg, D. Coward, R. Fantechi, V. Marzulli, P. Calafiura, M. Pepe, P. Debu, E. Mazzucato, A. Migliori, V. Fanti, Peter Buchholz, A. Ceccucci, A. Kreutz, E. Griesmayer, M. Pernicka, G. Laverrière, H. D. Wahl, P. Lariccia, F. Leber, B. Peyaud, G. Kesseler, I. Mannelli, G.D. Barr, L. Gatignon, A. Gonidec, T. Taurok, R. Turlay, M. Savrie, F. Laico, Y. Kozhevnikov, and T. Stemmler
- Subjects
Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,Muon ,Calorimeter (particle physics) ,Physics::Instrumentation and Detectors ,Krypton ,Detector ,chemistry.chemical_element ,Electron ,Nuclear physics ,chemistry ,High Energy Physics::Experiment ,Detectors and Experimental Techniques ,Nuclear Experiment ,Instrumentation ,Image resolution ,Noise (radio) - Abstract
A prototype electromagnetic calorimeter containing 180 litres of liquid krypton has been tested in electron and muon beams at the CERN SPS. The main features of this detector are its active shower medium, a granularity of 2 cm with tower readout, and the use of the initial current readout technique with an effective shaping time of about 60 ns. An energy resolution for electrons of 4.1% √E[ GeV ] with a constant term of 0.4% and a noise contribution of 50 MeV has been achieved. The calorimeter has a spatial resolution of 4.5 mm √E[ GeV ] with a constant term of 0.3 mm and a time resolution of about 0.5 ns for energies larger than 10 GeV.
- Published
- 1994
37. Design and performance tests of the CDF time-of-flight system
- Author
-
H. Matsunaga, W. Carithers, A. Kazama, C. Grozis, Y. Oh, R. Stanek, Fumihiko Ukegawa, B. Kim, Stefano Giagu, W. Kononenko, Matthew Jones, F. M. Newcomer, M. Mulhearn, K. Takikawa, Ilya Kravchenko, Yongsun Kim, Giovanni Bellettini, S. Motohashi, R. VanBerg, S. Cabrera, C. Cerri, Ivan-Kresimir Furic, M. Rescigno, Chunhui Chen, D. Depedis, L. Zanello, Joe Kroll, S. Pavlon, Konstanty Sumorok, Teresa Rodrigo, A. Korn, Katsufumi Sato, G.M. Mayers, A. Menzione, D.H. Kim, C. Paus, A. Ruiz, C. Dionisi, Ivan Vila, K. Anikeev, D. Usynin, S. Kim, I. Yu, G. Bauer, R. Kephart, and S.B. Kim
- Subjects
Physics ,Nuclear and High Energy Physics ,Photomultiplier ,Physics::Instrumentation and Detectors ,business.industry ,High Energy Physics::Phenomenology ,Detector ,Solenoid ,Radius ,Scintillator ,Nuclear physics ,Time of flight ,Optics ,High Energy Physics::Experiment ,B meson ,business ,Instrumentation ,Beam (structure) - Abstract
The CDF II detector contains a time-of-flight detector consisting of 216 scintillator bars of 279 cm length and 4×4 cm2 cross-section located at a radius of 138 cm from the beam axis. The bars are installed on the inner surface of the CDF solenoid, which produces an axial field of 1.4 T. Nineteen-stage fine-mesh photomultiplier tubes are attached at both ends of the scintillator bars. Photostatistics limit the time-of-flight resolution, which is expected to be 100 ps. The primary physics motivation is K± identification for improved neutral B meson flavor determination.
- Published
- 2001
38. The NA48 liquid krypton prototype calorimeter
- Author
-
P. Schilly, M. Debeer, D. Schiuma, A. Kreutz, D. Schinzel, P. Wicht, I. Mannelli, A. Lacourt, H. Taureg, G. Linser, V.M. Marzulli, L. Gatignon, R. Carosi, G. Kesseler, M. Pernicka, M. Markytan, P. Debu, W. Seidl, G. Gennaro, A. Bigi, G.M. Pierazzini, G.D. Barr, C. Cerri, Anton Taurok, G. Viehhauser, P. Calafiura, D. Coward, Peter Buchholz, B. Hallgren, Niels Doble, H. D. Wahl, L. Bertanza, B. Peyaud, G. Neuhofer, C.-E. Wulz, D. Bederede, D.C. Cundy, M. Mast, R. Casali, B. Gorini, F. Sergiampietri, R. Fantechi, G. Laverrière, A. Gonidec, and E. Griesmayer
- Subjects
Physics ,Nuclear and High Energy Physics ,Calorimeter (particle physics) ,Physics::Instrumentation and Detectors ,Krypton ,Resolution (electron density) ,NA48 experiment ,chemistry.chemical_element ,Nuclear physics ,chemistry ,Homogeneous ,Cathode ray ,CP violation ,High Energy Physics::Experiment ,Instrumentation ,Energy (signal processing) - Abstract
The NA48 experiment for a precision measurement of the CP violation parameter ϵ′ ϵ in K 0 → 2 π decays will require a fast electromagnetic calorimeter with excellent energy and time resolution. A quasi homogeneous calorimeter using liquid krypton and a fast readout with 40 MHz FADCs is proposed. A prototype with 400 kg of liquid krypton was built and tested in an electron beam. Results for the energy, space and time resolution of this prototype are given.
- Published
- 1992
39. Low noise analog CMOS signal processor with a large dynamic range for silicon calorimeters
- Author
-
E. Beuville, S. Buytaert, C. Cerri, and Pierre Jarron
- Subjects
Nuclear and High Energy Physics ,Engineering ,Digital signal processor ,business.industry ,Amplifier ,Electrical engineering ,Hardware_PERFORMANCEANDRELIABILITY ,Integrated circuit ,Chip ,Multiplexer ,Capacitance ,Atomic and Molecular Physics, and Optics ,law.invention ,CMOS ,Hardware_GENERAL ,law ,Hardware_INTEGRATEDCIRCUITS ,Electronic engineering ,business ,Charge amplifier - Abstract
A low-noise signal processor using CMOS technology is designed for the silicon calorimeter SiCAL of the ALEPH experiment. Modifications are made to the AMPLEX integrated circuit designed for the inner silicon detector of the UA-2 experiment. The output voltage swing has been improved to 6 V. A fast analog summing system, based on the neural network principle, computes the average of charges received at the inputs for trigger generation. The chip contains 16 channels including a charge amplifier, shaper amplifier, track-and-hold stage, multiplexer, fast analog sum and calibration system. The power consumption of the overall chip will be about 100 mW. The predicted equivalent noise charge per channel is 800 e rms − plus 20 e rms − per pF of input capacitance, and the peaking time is around 300 ns for an input capacitance of 20 to 50 pF.
- Published
- 1991
40. Observation of the decay KLO→ e+e−ep+e−
- Author
-
B. Renk, H. D. Wahl, B. Panzer, V. Gibson, M. Calvetti, J. van der Lans, G. Zech, A. Bigi, D.C. Cundy, D. Coward, I. Mannelli, G.M. Pierazzini, D. J. Candlin, M. Holder, M. Rost, A. Kreutz, R. Heinz, L. Gatignon, R. Casali, H.G. Sander, H.N. Nelson, R. Carosi, G.D. Barr, O. Perdereau, Paolo Calafiura, Arthur Schaffer, Niels Doble, G. Grafström, R. Hagelberg, C. Cerri, P. Mayer, Lydia Iconomidou-Fayard, G. Quast, L. Bertanza, A. Wagner, Ken Peach, Ph. Heusse, Daniel Fournier, H. Rohrer, A. Nappi, E. Augé, Konrad Kleinknecht, H. Blümer, R. Werthenbach, I. Harrus, Laurent Serin, and R. Fantachi
- Subjects
Physics ,Nuclear and High Energy Physics ,Branching fraction ,Theoretical models ,Atomic physics - Abstract
Two events with the characteristic of the decay K L O → e + e − e − have been observed with a negligible expected background from which a branching ratio of (4±3)×10 −8 is derived. This result is consistent with values estimated from theoretical models based on the double internal conventional of the decay K L O → γγ .
- Published
- 1991
41. Measurement of the rate of the decay KL→e+e−γ and observation of a form factor in this decay
- Author
-
H. D. Wahl, P. Calafiura, R. Heinz, Ken Peach, R. Hagelberg, H.G. Sander, I. Harrus, V. Gibson, R.L. Chase, H. Blümer, R. Fantechi, Daniel Fournier, H. Rohrer, R. Black, Arthur Schaffer, B. Panzer, A. Kreutz, Konrad Kleinknecht, L. Gatignon, C. Cerri, I. Mannelli, W. Weihs, G.D. Barr, H.N. Nelson, N. Doble, P. Grafström, M. Calvetti, M. Rost, R. Casali, A. Bigi, B. Renk, R. Werthenbach, D. Coward, J. van der Lans, G. Zech, G. Kesseler, R. Carosi, G.M. Pierazzini, Lydia Iconomidou-Fayard, D.C. Cundy, J. Muir, D. J. Candlin, P. Mayer, M. Holder, Ph. Heusse, H. Burkhardt, E. Augé, G. Quast, and A. Nappi
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Photon ,Meson ,Branching fraction ,Propagator ,High Energy Physics::Experiment ,Large sample - Abstract
A large sample of Dalitz decays, K L → e + e − γ , has been observed. The branching ratio is Γ(K L →e + e − γ) Γ(K L → all )=(9.2±0.5±0.5)×10 −6 in good agreement with theoretical predictions. We observe an enhancement at high masses in the distribution of the invariant electron-positron pair mass, compared to the distribution expected from QED. This excess is interpreted as being due to virtual mesons contributing to the photon propagator.
- Published
- 1990
42. The NA31 ϵ'/ϵ measurement
- Author
-
Arthur Schaffer, W. Weihs, L. Bertanza, Konrad Kleinknecht, Ken Peach, Daniel Fournier, H. Rohrer, Lydia Iconomidou-Fayard, R. Heinz, L. Gatignon, J. Muir, G.M. Pierazzini, H.G. Sander, R. Chase, D. J. Candlin, G. Kesseler, B. Renk, S. Galeotti, H.N. Nelson, V. Gibson, C. Cerri, H. Burkhardt, E. Auge, R. Black, H. Blümer, I. Harrus, A. Kreutz, I. Mannelli, J. van der Lans, G. Zech, D.C. Cundy, G. Gargani, P. Mayer, H. D. Wahl, Ph. Heusse, Peter Clarke, R. Werthenbach, R. Fantecho, A. Bigi, G. Quast, A. Nappi, D. Coward, R. Casali, Clemens Becker, Paolo Calafiura, N. Doble, Milene Calvetti, B. Panzer, P. Grafström, G.D. Barr, R. Hagelberg, M. Rost, M. Holder, and R. Carosi
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,CP violation ,Atomic and Molecular Physics, and Optics - Published
- 1990
43. The Role of Ultrasonography in the Obstructive Acute Abdomen
- Author
-
Yamachira, V.S., primary, Ban, A.H., additional, Ferraciolli, S.F., additional, Talans, A., additional, Francisco Neto, M.J., additional, Chammas, M.C., additional, and C Cerri, G.G., additional
- Published
- 2013
- Full Text
- View/download PDF
44. Sacral reflexes recorded with monopolar short needle electrodes
- Author
-
L. Piccinini, C. Cerri, D. Passerini, S. Premoselli, and V. Galimberti
- Subjects
Materials science ,General Neuroscience ,Electrode ,Reflex ,Neurology (clinical) ,Anatomy - Published
- 1995
45. Perineal sympathetic skin response
- Author
-
C. Cerri, V. Galimberti, D. Passerini, and S. Premoselli
- Subjects
business.industry ,General Neuroscience ,Anesthesia ,Medicine ,Neurology (clinical) ,Sympathetic skin response ,business - Published
- 1995
46. Assay of adenylate cyclase in homogenates of control and Duchenne human skeletal muscle
- Author
-
J.H. Willner, C. Cerri, and L.P. Rowland
- Subjects
medicine.medical_specialty ,Clinical Biochemistry ,Adenylate kinase ,Biochemistry ,Cyclase ,Muscular Dystrophies ,chemistry.chemical_compound ,Adenosine Triphosphate ,Internal medicine ,Methods ,medicine ,Humans ,Magnesium ,Cyclic adenosine monophosphate ,biology ,Muscles ,Biochemistry (medical) ,Temperature ,Skeletal muscle ,General Medicine ,Hydrogen-Ion Concentration ,Adenosine ,Enzyme assay ,Endocrinology ,medicine.anatomical_structure ,chemistry ,biology.protein ,Calcium ,Cyclase activity ,Adenylyl Cyclases ,medicine.drug ,Homogenization (biology) - Abstract
The wide range of values reported for activity of adenylate cyclase (AC) in human skeletal muscle prompted re-evaluation of conditions used for homogenization and assay. Adenylate cyclase activity in the same normal muscle differed with different techniques of homogenization. In pH 7.5 isotonic Tris buffer, basal and catecholamine-activated activities declined rapidly in homogenates kept at 4°C. Loss of basal activity was prevented by addition of a chelator of divalent cations. Loss of response to isoproterenol was prevented by addition of guanylnucleotides. Enzyme activity was maximal at 37°C and pH 7.6. Enzyme activity was lower when theophylline was used to prevent degradation of labelled 3',5' cyclic adenosine monophosphate (cyclic AMP) than when unlabelled cyclic AMP was used to this purpose. Basal activity increased with increased MgCl 2 concentration up to 50 mmol/l, but isoproterenol-activated activity was maximal at 4 mmol/l MgCl 2 . AC was inhibited by exogenous adenosine, but addition of adenosine deaminase to the assay mixture did not increase AC activity. Based upon these observations, standardized procedures of homogenization and assay were devised and used to measure AC activity in muscles of boys with Duchenne muscular dystrophy: basal and isoproterenol-stimulated activities were abnormally low.
- Published
- 1981
47. Search for the decay KL→π0e+e−
- Author
-
Ken Peach, G.D. Barr, Lydia Iconomidou-Fayard, H.N. Nelson, G. Kesseler, Ian Shipsey, H. Burkhardt, B. Pijlgroms, Daniel Fournier, W. Weihs, H. Rohrer, Konrad Kleinknecht, H. Blümer, H. D. Wahl, B. Panzer, W. Stephenson, Arthur Schaffer, M. Kasemann, P. Mayer, N. Doble, A. M. Lutz, A. Bigi, I. Mannelli, R. Hagelberg, L. Bertanza, M. Holder, Ph. Heusse, V. Gibson, H. G. Sander, Peter Clarke, C. Cerri, J. van der Lans, G. Zech, J. Steinberger, B. Renk, J. Muir, E. Augé, D. J. Candlin, G. M. Pierazzini, R.L. Chase, H. Taureg, T. Miczaika, R. Casali, C. Youngman, G. Quast, M. Corti, D. Coward, A. Nappi, R. Heinz, R. Carosi, D.C. Cundy, P. Calafiura, M. Calvetti, M. Rost, R. Black, L. Gatignon, and I. Harrus
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,Event (relativity) ,Limit (mathematics) - Abstract
A search for the decay KL→π0e+e− has been performed at the CERN SPS. One candidate event has been found, compatible with an expected background of 1.5 events. The corresponding upper limit for the branching ration is Γ(KL→π0e+e−)Γ(KL → all)
- Published
- 1988
48. First evidence for direct CP violation
- Author
-
W. Weihs, H. G. Sander, Ken Peach, R.L. Chase, H. Burkhardt, W. Stephenson, G. Dietrich, B. Pijlgroms, Daniel Fournier, M. Corti, R. Carosi, D.C. Cundy, D. Coward, E. Massa, Clemens Becker, J. Muir, Ian Shipsey, D. J. Candlin, J. Steinberger, B. Panzer, Konrad Kleinknecht, G. M. Pierazzini, D. Heyland, A. M. Lutz, G. Kesseler, N. Doble, H. Blümer, A. Bigi, I. Mannelli, Lydia Iconomidou-Fayard, R. Casali, C. Cerri, W. Heinen, Arthur Schaffer, M. Holder, Ph. Heusse, Peter Clarke, M. Kasemann, C. Youngman, G. Gargani, R. Hagelberg, G. Quast, E. Augé, J. van der Lans, G. Zech, A. Nappi, H. Taureg, M. Calvetti, M. Rost, H. D. Wahl, L. Gatignon, R. Black, T. Miczaika, B. Renk, V. Gibson, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA31, and Starita, Sabine
- Subjects
Quark ,Physics ,Particle physics ,Nuclear and High Energy Physics ,[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] ,010308 nuclear & particles physics ,Branching fraction ,Nuclear Theory ,01 natural sciences ,010305 fluids & plasmas ,Nuclear physics ,Transition radiation detector ,Amplitude ,Pion ,Isospin ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,CP violation ,High Energy Physics::Experiment ,010306 general physics ,Phenomenology (particle physics) ,Particle Physics - Experiment - Abstract
Since CP violation was first observed in the decay of the long-lived neutral kaon into two pions [1], it remains one of the enigmas in particle physics. Whilst CP violation is manifest in neutral kaon decays, the search for CP-violating effects has elsewhere been unsuccessful. In the phenomenology of CP violation in the neutral kaon system [2], the short- and long-lived mass eigenstates are usually defined in terms of the CP eigenstates K1 (CP = + 1) and K2 (CP = - 1) as Ks ≈ K1 + ?K2 and KL ≈ K2 + ?K1. The parameter ? describes CP violation induced by kaon state-mixing. Direct CP violation may also occur in the decay of K2 into two pions with a relative amplitude ?′, which is non-zero in the case of a phase difference between the amplitudes A0 and A2 for the decay into isospin O and 2 states of two pions. Before the present measurement, all experimental results were compatible with ? = 2.27 × 10-3 exp (i 43.70) and with the Superweak Model [3], in which state-mixing is the only source of CP violation and ?′ = 0. In the Standard Model with six weakly interacting quarks [4], direct CP violation as well as state-mixing is introduced by transitions via heavy-quark intermediate states. Based on this, a small, but non-zero, value of ?′ is predicted [5]. To a good approximation, ?′ /? is related to the double ratio R of the relative decay rates of the long- and short-lived neutral kaons into two neutral and two charged pions as Re (?′/?) = 1/6 × (1 - R).
- Published
- 1988
- Full Text
- View/download PDF
49. Measurement of charged particle multiplicities associated with large transverse momentum photons in proton-proton collisions
- Author
-
R. Thun, C. Bradaschia, L. Ristori, R. Kephart, H. Jöstlein, P. L. Braccini, G. Bellettini, T. Del Prete, P. Laurelli, S. R. Amendolia, L. Foà, G. Sanguinetti, M. Valdata, P. D. Grannis, G. Finocchiaro, R. Castaldi, D. Green, C. Cerri, P. Giromini, and A. Menzione
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Range (particle radiation) ,Photon ,Large Hadron Collider ,Proton ,Intersecting Storage Rings ,Charged particle ,Nuclear physics ,Angular distribution ,Transverse momentum ,High Energy Physics::Experiment ,Nuclear Experiment - Abstract
We have measured the behaviour or charged-particle multiplicities as a function of the transverse momentum of photons produced at 90° in proton-proton collisions. The data were obtained at the CERN Intersecting Storage Rings (ISR) at a centre-of-mass energy of 53 GeV and cover the transverse momentum range 0
- Published
- 1974
50. Determination of the optimum working conditions of photomultipliers
- Author
-
C. Bemporad, G. Bellettini, C. Cerri, and L. Foà
- Subjects
Photomultiplier ,Materials science ,Optics ,business.industry ,Maximum gain ,Linearity ,Tube (fluid conveyance) ,General Medicine ,business ,Voltage - Abstract
The effects of varying independently the inter-dinode voltages of Philips photomultipliers types 56 AVP and 58 AVP on the linearity and maximum gain obtainable are described. It is found that great improuvements are possible over the performances obtainable with the voltage distributions recommended by the manufacturers and that with voltage distributions optimized separately for each tube it is always possible to at least achieve the maximum performances claimed by the manufacturers. The distributions recommended by them do not fulfill these claims.
- Published
- 1963
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