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42 results on '"B. Peyaud"'

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

Author

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

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

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

Published
2014
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2. A new measurement of the K±→π±γγ decay at the NA48/2 experiment

Author

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

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

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

Published
2014
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3. Composite mirror facets for ground based gamma ray astronomy

Author

Pierre Brun, Dominique Durand, Jean-Franois Glicenstein, B. Peyaud, P. H. Carton, M. C. Medina, C. Jeanney, and P. Micolon

Subjects
Nuclear and High Energy Physics, Fabrication, Ciencias Físicas, Astrophysics::High Energy Astrophysical Phenomena, Instrumentation, Composite number, FOS: Physical sciences, High Energy Physics - Experiment, purl.org/becyt/ford/1 [https], High Energy Physics - Experiment (hep-ex), Optics, Atmospheric Cherenkov telescopes, High Energy Physics, Reflection (computer graphics), Instrumentation and Methods for Astrophysics (astro-ph.IM), Cherenkov radiation, Physics, Gamma-ray astronomy, CTA, business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, purl.org/becyt/ford/1.3 [https], Cherenkov Telescope Array, Astronomía, Mirrors, Astrophysics - Instrumentation and Methods for Astrophysics, business, Focus (optics), CIENCIAS NATURALES Y EXACTAS
Abstract

Composite mirrors for gamma-ray astronomy have been developed to fulfill the specifications required for the next generation of Cherenkov telescopes represented by CTA (Cherenkov Telescope Array). In addition to the basic requirements on focus and reflection efficiency, the mirrors have to be stiff, lightweight, durable and cost efficient. In this paper, the technology developed to produce such mirrors is described, as well as some tests that have been performed to validate them. It is shown that these mirrors comply with the needs of CTA, making them good candidates for use on a significant part of the array., Comment: 16 pages, 13 figures, accepted to be published on NIM A

Published
2013
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4. Measurement of the branching ratio of the decay Ξ0→Σ+μ−ν¯μ

Author

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
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5. New measurement of the K±→π+π−e±ν (Ke4) decay branching ratio and hadronic form factors

Author

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
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6. Test of lepton flavour universality in K+→ℓ+ν decays

Author

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
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7. New measurement of the K±→π±μ+μ− decay

Author

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
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8. Empirical parameterization of the K±→π±π0π0 decay Dalitz plot

Author

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
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9. First observation and measurement of the decay K±→π±e+e−γ

Author

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
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10. Measurement of the Dalitz plot slope parameters of the K±→π±π+π− decay

Author

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
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11. Measurement of Kμ30 form factors

Author

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
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12. Measurement of the ratio Γ(KL→π+π−)/Γ(KL→π±e∓ν) and extraction of the CP violation parameter |η+−

Author

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
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13. 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
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14. 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
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15. A measurement of the CP-conserving component of the decay KS0→π+π−π0

Author

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.

Published
2005
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16. Measurement of the KL→e+e−e+e− decay rate

Author

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 .

Published
2005
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18. Measurement of the branching ratio of the decay and extraction of the CKM parameter

Author

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

Subjects
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
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19. Observation of the rare decay KS→π0μ+μ−

Author

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.

Published
2004
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20. Measurement of the Ξ0→Λγ decay asymmetry and branching fraction

Author

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
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21. Observation of the decay KS→π+π−e+e−

Author

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
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22. First measurement of direct CP violation with the NA48 detector at CERN

Author

B. Peyaud

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Detector, Value (computer science), CP violation, Atomic and Molecular Physics, and Optics
Abstract

A new advance on direct CP violation in the neutral kaon system has been made by the NA48 Collaboration at CERN. We report on the measurement of the parameter Re(e'/e) based on the data collected in 1997. The experiment is performed by studying all four relevant decays modes of K L /K S to π + π − and π 0 π 0 collected simultaneously in the NA48 detector. We have obtained the value Re(e'/e)=[18.5±4.5(stat)±5.8(syst)]×10 −4 .

Published
2000
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23. Measurement of the decay rate and form factor parameter in the decay KL→e+e−γ

Author

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
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24. 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
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25. 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
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26. Search for the decay

Author

R. Coleman, B. Vallage, G. Makoff, V. Papadimitriou, S. Somalwar, G. Graham, Juliet Ritchie Patterson, P. Debu, R. Tschirhart, E. J. Ramberg, T. Yamanaka, R. A. Briere, Y. W. Wah, B. Winstein, E. C. Swallow, L. K. Gibbons, G. D. Collin, G. J. Bock, H. Yamamoto, R. Turlay, Y. B. Hsiung, M. Karlsson, Roland Winston, K. Stanfield, B. Peyaud, A. R. Barker, and J. Enagonio

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Fermilab, Short distance, Standard Model
Abstract

Data collected in Fermilab experiment E731 was used to perform the first search for the decay K L → π 0 vv. This decay is dominated by short distance effects and is almost entirely direct CP violating within the standard model. Cuts were developed to reject the background processes Λ → nπ 0 and K L → π + e − γv. No candidate events were seen. We find BR (K L → π 0 vv) < 2.2.×10 − at the 90% confidence level

Published
1992
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27. Preface

Author

J.-B. Peyaud, I. McKinley, and J. West

Subjects
Geochemistry and Petrology, Economic Geology
Published
2006
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28. Measurement of the neutral to charged current cross section ratio in neutrino and antineutrino interactions

Author

D. Schlatter, R. Turlay, H. D. Wahl, B. Peyaud, M. Holder, A. Berthelot, K. Tittel, A. Savoy-Navarro, G. Spahn, H. J. Willutzki, J. Steinberger, C. Geweniger, S. Whitaker, H. Suter, Konrad Kleinknecht, V. Hepp, M. Grimm, J. Wotschack, P. Bloch, John Rander, J. Knobloch, E.G.H. Williams, F. Dydak, F. Ranjard, H.P. Paar, W. Dorth, Francesco Navarria, J. May, P. Palazzi, B. Devaux, J. Maillard, and F. Eisele

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Neutral current, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Cross section (physics), Narrow band, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Charged current, Particle Physics - Phenomenology
Abstract

The authors report on the analysis of inclusive neutral current events produced in neutrino and antineutrino narrow band beams. One finds for incident neutrino energies in the range 12-200 GeV and for hadron energies above 12 GeV a neutral charged current cross-section ratio of R/sub nu /=0.293+or-0.010 for incident neutrinos, and R/sub anti nu /=0.35+or-0.03 for antineutrinos. These ratios are consistent with the Weinberg-Salam model, with sin/sup 2/ theta /sub w/=0.24+or-0.02. (6 refs).

Published
1977
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29. Study of inclusive neutral current interactions of neutrinos and antineutrinos

Author

P. Bloch, John Rander, J. May, M. Grimm, Francesco Navarria, J. Steinberger, Konrad Kleinknecht, D. Schlatter, Paolo Palazzi, A. Savoy-Navarro, H. J. Willutzki, H.P. Paar, H. D. Wahl, W. Dorth, B. Peyaud, J. Maillard, F. Eisele, E.G.H. Williams, F. Dydak, R. Turlay, K. Tittel, G. Spahn, F. Ranjard, B. Devaux, H. Suter, J. Knobloch, V. Hepp, C. Geweniger, S. Whitaker, M. Holder, and J. Wotschack

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Neutrino, Charged current
Abstract

We report on results from a study of hadron-energy distributions for ν and ν inclusive neutral current interactions. There is no significant variation of the neutral to charged current total cross-section ratios R ν and R ν with neutrino energy. The space-time structure of neutral currents is dominated by V − A , with a significant admixture of V + A . The Weinberg-Salam model is in agreement with all data if sin 2 θ w =0.24±0.02.

Published
1977
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30. Results of a beam dump experiment at the CERN SPS neutrino facility

Author

P. Bloch, H.P. Paar, W. Dorth, F. Eisele, T. Hansl, G. Spahn, S. Whitaker, H. Suter, S. Loucatos, John Rander, Konrad Kleinknecht, B. Devaux, J. Millard, F. Ranjard, J. May, M. Holder, K. Tittel, J. Knobloch, D. Schlatter, V. Hepp, W. von Rüden, P. Palazzi, C. Geweniger, Francesco Navarria, A. Savoy-Navarro, H. J. Willutzki, J. Steinberger, R. Turlay, H. D. Wahl, B. Peyaud, E.G.H. Williams, F. Dydak, J. Wotschack, and H. Lierl

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, lcsh:QC1-999, law.invention, Nuclear physics, Pair production, law, Measurements of neutrino speed, High Energy Physics::Experiment, Beam dump, Neutrino, Nuclear Experiment, lcsh:Physics, Lepton
Abstract

We report results from a beam dump experiment that has been performed at the CERN SPS neutrino facility using the CDHS neutrino counter detector. Limits on dimuon and trimuon production by new penetrating neutral particles are given. A new source of prompt electron and muon neutrinos has been observed giving (1.2±0.4)× 10−7 νe or νμ per incident proton with neutrino angle smaller than 1.85 mrad and Eν > 20 GeV. If these prompt neutrinos are attributed to charmed meson pair production, the inclusive DD production cross section could be of the order of 30 ωb. If axions are existing their production rate relative to π0 mesons is found to be less than 0.5 × 10−8.

Published
1978
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31. Search for single positive muon production in neutrino interactions

Author

E.G.H. Williams, F. Dydak, D. Schlatter, Francesco Navarria, J. May, J. Wotschack, P. Bloch, F. Eisele, A. Savoy-Navarro, J. Maillard, H. J. Willutzki, V. Hepp, P. Palazzi, J. Steinberger, R. Turlay, G. Spahn, M. Grimm, M. Holder, John Rander, H. D. Wahl, K. Tittel, Konrad Kleinknecht, B. Peyaud, C. Geweniger, B. Devaux, J. Knobloch, S. Whitaker, H. Suter, F. Ranjard, H.P. Paar, and W. Dorth

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Muon, High Energy Physics::Phenomenology, Elementary particle, Massless particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Particle Physics - Experiment, Lepton
Abstract

A search has been made for neutrino interactions with a positive (wrong-sign) muon in the final state. All the events found can be attributed to known sources. A cut at a visible energy of 100 GeV leaves one event, giving an upper limit for μ + production relative to μ - of 1.6 × 10 −4 at the 90% confidence level. Upper limits are given for (a) charm-changing neutral currents, (b) positive heavy-lepton production, and (c) neutrino-antineutrino oscillations.

Published
1978
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32. Characteristics of trimuon events observed in high-energy neutrino interactions

Author

P. Bloch, K. Tittel, P. Palazzi, A. Savoy-Navarro, R. Turlay, S. Loucatos, H. J. Willutzki, J. May, Konrad Kleinknecht, F. Ranjard, John Rander, D. Schlatter, H. D. Wahl, J. Wotschack, A. Para, B. Peyaud, W. von Rüden, H. Suter, J. Knobloch, E.G.H. Williams, F. Dydak, M. Holder, H.P. Paar, S. Whitaker, C. Geweniger, J. Maillard, W. Dorth, T. Hansl, V. Hepp, H. Lierl, G. Spahn, Francesco Navarria, F. Eisele, B. Devaux, and J. Steinberger

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, High energy, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Angular distribution, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Event (particle physics), Charged current
Abstract

The properties of 76 neutrino-initiated μ − μ − μ + events observed in the CDHS detector in the 350 GeV and 400 GeV wide-band beams at CERN are discussed. For neutrino energies 30 GeV and muon momenta ≳4.5 GeV, the average trimuon rate is (3.0 ± 0.4) × 10 −5 of the single-muon event rate. The experimental distributions are compared with predictions from various models. The data cannot be understood in terms of either heavy-lepton or heavy-quark cascades; no evidence is found for such processes and upper limits for the two possibilities are established. The data can be understood in terms of the normal charged-current process with the additional production of a muon pair by both hadronic and electromagnetic processes.

Published
1978
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33. Evidence forΨ production by neutrinos via neutral currents

Author

T. Ruan, A. Para, C. Geweniger, J. P. Schuller, F. Dydak, Claude Guyot, T. Flottmann, S. Loucatos, W. Wu, P. Palazzi, B. Renk, Halina Abramowicz, H. J. Willutzki, J. Steinberger, J. May, J. He, J. Ḱlikowski, J. De Groot, K. Tittel, Konrad Kleinknecht, H. P. Klasen, F. Ranjard, R. Turlay, H. D. Wahl, D. Schlatter, B. Peyaud, J. Wotschack, F. Eisele, W. von Rüden, H. Taureg, John Rander, B. Pszola, Jean-Pierre Merlo, Joseph Rothberg, J. Knobloch, and H. Lierl

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Cross section (physics), Neutral current, Neutrino, Nucleon
Abstract

Experimental evidence for the diffractive production ofΨmesons in weak neutral current reactions is reported. The spectrum-averaged cross section for this process isσdiff = (4.2±1.5) × 10−41cm2/nucleon, in agreement with gluonfusion models, but at variance with vector dominance calculations.

Published
1982
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34. A search for νμ oscillations in the Δm2 range 0.3–90 eV2

Author

J. P. Schuller, B. Pszola, P. Perez, J. Steinberger, J. Wotschack, F. Eisele, A. Para, H. Taureg, H. Abramowicz, John Rander, H. Wachsmuth, P. Debu, T. Flottmann, Joseph Rothberg, Holt Meyer, R. Turlay, H. Blümer, J. Duda, H. D. Wahl, Jean-Pierre Merlo, H. Keilwerth, J. De Groot, K. Tittel, Konrad Kleinknecht, Jan Krolikowski, G.J. Feldman, W. von Rüden, B. Falkenburg, C. Geweniger, Peter Buchholz, B. Renk, J. Knobloch, F. Dydak, B. Peyaud, Claude Guyot, and R. Belusević

Subjects
Massless particle, Nuclear reaction, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, Elementary particle, Neutrino, Neutrino oscillation, Lepton
Abstract

We have searched for ν μ oscillations by comparing the rates of ν gm charged-current interactions in two detectors located 130 and 885 m from the target, which was struck by a 9.2 GeV/ c proton beam from the CERN Proton Synchroton. No evidence for ν μ oscillations was found. At the 90% confidence level, Δm 2 values between 0.26 and 90 eV 2 are excluded for maximal mixing. The most restrictive limit on the neutrino mixing-angle parameter sin 2 2 θ is 0.053 at Δm 2 =2.5 eV 2 .

Published
1984
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35. A detector for high-energy neutrino interactions

Author

R. Turlay, F. Eisele, B. Devaux, H. D. Wahl, D. Pollmann, A. Savoy-Navarro, B. Peyaud, H. J. Willutzki, P. Schilly, F. Ranjard, H. Suter, W. Heyde, P. Palazzi, M. Grimm, Y. Malbequi, K. Tittel, J. Steinberger, G. Tarte, John Rander, A. Lacourt, J. May, J. Wotschack, S. Brehin, V. Hepp, Konrad Kleinknecht, M. Holder, G. Laverrière, G. Marel, Francesco Navarria, J. Maillard, H.P. Paar, W. Dorth, G. Geweniger, G. Spahn, J. Knobloch, E.G.H. Williams, F. Dydak, M. Vysočanský, D. Schlatter, and P. Bloch

Subjects
Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Hadron, General Medicine, Nuclear physics, Neutrino detector, Magnet, Scintillation counter, Measurements of neutrino speed, High Energy Physics::Experiment, Detectors and Experimental Techniques, Neutrino, Nuclear Experiment
Abstract

We describe the design, construction and performance of a large mass detector used at CERN to study high-energy neutrino interactions in iron. This detector combines magnetic spectrometry and hadron calorimetry techniques.

Published
1978
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36. Trimuon events observed in high-energy antineutrino interactions

Author

J. Steinberger, S. Loucatos, R. Turlay, T. Hansl, Jean-Pierre Merlo, H. D. Wahl, H.P. Paar, J. Wotschack, V. Hepp, John Rander, W. Dorth, B. Peyaud, H. Lierl, C. Geweniger, P. Bloch, J. Knobloch, A. Savoy-Navarro, M. Holder, F. Eisele, S. Whitaker, Konrad Kleinknecht, H. J. Willutzki, A. Para, E.G.H. Williams, F. Dydak, H. Suter, J. May, F. Ranjard, D. Schlatter, W. von Rüden, J. De Groot, J. Maillard, B. Devaux, K. Tittel, G. Spahn, Francesco Navarria, and P. Palazzi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, High energy, Muon, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Visible energy, Nuclear physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Beam (structure)
Abstract

Eight μ + μ + μ − events have been observed in the CDHS detector during the 330 GeV and 350 GeV antineutrino wide-band beam exposures at CERN. The corresponding average trimuon rate relative to the single-muon rate is (1.8 ± 0.6) × 10 −5 for visible energy ⩾ 30 GeV and muon momenta ⩾ 4.5 GeV c . Some characteristics of these antineutrino trimuon events are compared with μ − μ − μ + events produced by neutrinos.

Published
1979
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37. The response and resolution of an iron-scintillator calorimeter for hadronic and electromagnetic showers between 10 GeV and 140 GeV

Author

T. Flottmann, Konrad Kleinknecht, H. P. Klasen, A. Para, H. Taureg, Jean-Pierre Merlo, J. Knobloch, F. Eisele, J. De Groot, W. Wu, R. Turlay, J. P. Schuller, John Rander, P. Palazzi, H. D. Wahl, J. Steinberger, J. Wotschack, B. Peyaud, B. Renk, J. Królikowski, F. Ranjard, B. Pszola, K. Tittel, W. von Rüden, J. May, J. He, W D Schlatter, Halina Abramowicz, H. J. Willutzki, Claude Guyot, T. Ruan, F. Dydak, C. Geweniger, and Joseph Rothberg

Subjects
Physics, Particle physics, Meson, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, General Medicine, Scintillator, Particle detector, Calorimeter, Nuclear physics, Pion, Scintillation counter, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, Absorption (electromagnetic radiation)
Abstract

The energy resolution and response of a segmented iron-scintillator total absorption calorimeter has been measured for pion energies from 10 to 140 GeV and for electron energies up to 50 GeV. A procedure has been found to weight individual counter responses for hadron showers which results in improved energy resolution at high energies and a nearly linear dependence of response on hadron energy above 30 GeV. There is evidence in the data that this weighting procedure compensates for fluctuations in energy deposition due to the electromagnetic component of the hadronic shower. For an iron sampling thickness of 2.5 cm the hadron energy resolution follows a 0.58 E law, while the resolution for electromagnetic showers is 0.23 E .

Published
1981
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38. Right-left ambiguity resolution using field corrector readout in a large planar drift chamber

Author

G. Tarte, John Rander, and B. Peyaud

Subjects
Physics, Planar, Optics, Ambiguity resolution, Field (physics), business.industry, media_common.quotation_subject, General Medicine, Ambiguity, business, Asymmetry, media_common
Abstract

Induced signals on field corrector wires are used to resolve the right-left ambiguity in a large planar drift chamber. Efficient separation is obtained for ±3 cm drift cells, 4 m long. Technical problems involved in the method, in particular the severe geometrical constraints, are discussed. Important features of the avalanche asymmetry can be inferred from the measurements.

Published
1980
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39. Origin of trimuon events in high-energy neutrino interactions

Author

John Rander, C. Geweniger, T. Hansl, G. Spahn, K. Tittel, F. Eisele, P. Palazzi, A. Para, J. Knobloch, R. Turlay, H. D. Wahl, S. Loucatos, H. Suter, F. Ranjard, J. May, Konrad Kleinknecht, J. Wotschack, B. Peyaud, E.G.H. Williams, B. Devaux, Francesco Navarria, H.P. Paar, W. Dorth, A. Savoy-Navarro, H. J. Willutzki, J. Steinberger, F. Dydak, H. Lierl, S. Whitaker, V. Hepp, J. Maillard, M. Holder, D. Schlatter, and W. von Rüden

Subjects
Physics, Nuclear and High Energy Physics, High energy, Particle physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Event (particle physics)
Abstract

The properties of 76 neutrino‐initiated μ−μ−μ+ events observed in the CDHS detector in the 350 GeV and 400 GeV wide‐band beams at the CERN SPS are discussed. For neutrino energies ≳30 GeV and muon momenta ≳4.5 GeV, the average trimuon rate is (3.0±0.4) ×10−5 of the single‐muon event rate. The data are in agreement with normal charged‐current interactions with the additional production of a muon pair by both hadronic and radiative processes. No evidence is found for either heavy‐lepton or heavy‐quark cascades. Upper limits for these two possibilities are established.

Published
1978
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40. Observation of a neutrino event with four energetic muons

Author

John Rander, E.G.H. Williams, F. Dydak, P. Bloch, J. Knobloch, K. Tittel, Francesco Navarria, F. Eisele, D. Schlatter, H. Lierl, Konrad Kleinknecht, R. Turlay, V. Hepp, H. D. Wahl, B. Peyaud, J. Maillard, J. Wotschack, P. Palazzi, G. Spahn, B. Devaux, H.P. Paar, W. Dorth, F. Ranjard, J. May, H. Suter, S. Whitaker, J. Steinberger, M. Holder, A. Savoy-Navarro, H. J. Willutzki, and C. Geweniger

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Measurements of neutrino speed, Solar neutrino problem, Neutrino, Neutrino oscillation, Event (particle physics), Particle Physics - Experiment
Published
1978
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41. Observation of trimuon events produced in neutrino and antineutrino interactions

Author

A. Berthelot, P. Bloch, Francesco Navarria, B. Devaux, D. Schlatter, K. Tittel, J. Maillard, H. Suter, M. Grimm, John Rander, A. Savoy-Navarro, M. Holder, F. Eisele, H. J. Willutzki, J. Steinberger, J. Wotschack, G. Spahn, Konrad Kleinknecht, Paolo Palazzi, F. Ranjard, H. D. Wahl, B. Peyaud, V. Hepp, H.P. Paar, W. Dorth, R. Turlay, C. Geweniger, J. Knobloch, E.G.H. Williams, F. Dydak, and J. May

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Muon, Antimatter, Elementary particle, Fermion, Neutrino, Charged current, Lepton
Abstract

We report two trimuon events producedin v interactions. Of these, one is of the charge type −++, not previously reported. In an antineutrino exposure, one candidate of the charge type +−− has been observed. This type of event has also not been reported previously. The combined π → μ and K → μ background for the three events are calculated to be ∼ 0.7 events. The rate relative to charged current events corresponding to these three events is of the order of 4 × 10 −5 .

Published
1977
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42. Like-sign dimuon events produced in narrow-band neutrino and antineutrino beams

Author

M. Holder, J. Knobloch, J. May, H.P. Paar, P. Palazzi, D. Schlatter, J. Steinberger, H. Suter, H. Wahl, E.G.H. Williams, F. Eisele, C. Geweniger, K. Kleinknecht, G. Spahn, H-J. Willutzki, W. Dorth, F. Dydak, V. Hepp, K. Tittel, J. Wotschack, P. Bloch, B. Devaux, M. Grimm, J. Maillard, B. Peyaud, J. Rander, A. Savoy-Navarro, R. Turlay, and F.L. Navarria

Subjects
Nuclear and High Energy Physics
Published
1977
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