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

Author: The NA48/2 collaboration, J. R. Batley, G. Kalmus, C. Lazzeroni, D. J. Munday, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Maier, A. Norton, M. Patel, A. Peters, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, P. Dalpiaz, C. Damiani, M. Fiorini, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, W. Baldini, A. Cotta Ramusino, A. Gianoli, M. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, G. Ruggiero, A. Bizzeti, M. Veltri, M. Behler, K. Eppard, M. Hita-Hochgesand, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M. D. Wood, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, P. Cenci, M. Pepe, M. C. Petrucci, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, G. Collazuol, L. Di Lella, G. Lamanna, I. Mannelli, A. Michetti, C. Cerri, R. Fantechi, B. Bloch-Devaux, C. Cheshkov, J. B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, S. Bifani, M. Clemencic, S. Goy Lopez, C. Biino, N. Cartiglia, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, L. Widhalm, S. Balev, P. L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, A. Korotkova, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Stoynev, and A. Zinchenko
Subjects: Branching fraction, Fixed Target Experiments, Rare Decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract The NA48/2 experiment at CERN reports the first observation of the K ± → π 0 π 0 μ ± ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c 4 is measured to be (0.65 ± 0.03) × 10 −6. The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10 −6, in agreement with chiral perturbation theory predictions.
Published: 2024
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2. First observation and study of the K± → π±π0e+e− decay

Author: J.R. Batley, G. Kalmus, C. Lazzeroni, D.J. Munday, M.W. Slater, S.A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Maier, A. Norton, M. Patel, A. Peters, S. Balev, P.L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, P. Dalpiaz, C. Damiani, M. Fiorini, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, W. Baldini, A. Cotta Ramusino, A. Gianoli, M. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, G. Ruggiero, A. Bizzeti, M. Veltri, M. Behler, K. Eppard, M. Hita-Hochgesand, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M.D. Wood, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, P. Cenci, M. Pepe, M.C. Petrucci, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, G. Collazuol, L. DiLella, G. Lamanna, I. Mannelli, A. Michetti, C. Cerri, R. Fantechi, B. Bloch-Devaux, C. Cheshkov, J.B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, S. Bifani, M. Clemencic, S. Goy Lopez, C. Biino, N. Cartiglia, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm
Subjects: Physics, QC1-999
Abstract: The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003–2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K±→π±π0e+e−)=(4.24±0.14)×10−6. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.
Published: 2019
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3. Measurement of the form factors of charged kaon semileptonic decays

Author: The NA48/2 collaboration, J. R. Batley, G. Kalmus, C. Lazzeroni, D. J. Munday, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Maier, A. Norton, M. Patel, A. Peters, S. Balev, P. L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, P. Dalpiaz, C. Damiani, M. Fiorini, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, W. Baldini, A. Cotta Ramusino, A. Gianoli, M. Calvetti, E. Celeghini, E. Iacopini, M. Lenti, G. Ruggiero, A. Bizzeti, M. Veltri, M. Behler, K. Eppard, M. Hita-Hochgesand, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M. D. Wood, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, P. Cenci, M. Pepe, M. C. Petrucci, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, G. Collazuol, L. DiLella, G. Lamanna, I. Mannelli, A. Michetti, C. Cerri, R. Fantechi, B. Bloch-Devaux, C. Cheshkov, J. B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, S. Bifani, M. Clemencic, S. Goy Lopez, C. Biino, N. Cartiglia, F. Marchetto, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm
Subjects: Fixed target experiments, Rare decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract A measurement of the form factors of charged kaon semileptonic decays is presented, based on 4.4 × 106 K ± → π 0 e ± ν e (K e3 ± ) and 2.3 × 106 K ± → π 0 μ±ν μ (K μ3 ± ) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. The combination of measurements in the K e3 ± and K μ3 ± modes is also presented.
Published: 2018
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4. Search for the dark photon in π0 decays

Author: J.R. Batley, G. Kalmus, C. Lazzeroni, D.J. Munday, M.W. Slater, S.A. Wotton, R. Arcidiacono, G. Bocquet, N. Cabibbo, A. Ceccucci, D. Cundy, V. Falaleev, M. Fidecaro, L. Gatignon, A. Gonidec, W. Kubischta, A. Norton, A. Maier, M. Patel, A. Peters, S. Balev, P.L. Frabetti, E. Gersabeck, E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, P. Rubin, A. Walker, W. Baldini, A. Cotta Ramusino, P. Dalpiaz, C. Damiani, M. Fiorini, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, H. Wahl, A. Bizzeti, M. Lenti, M. Veltri, M. Calvetti, E. Celeghini, E. Iacopini, G. Ruggiero, M. Behler, K. Eppard, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke, A. Winhart, D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper, M. Velasco, M.D. Wood, P. Cenci, M. Pepe, M.C. Petrucci, G. Anzivino, E. Imbergamo, A. Nappi, M. Piccini, M. Raggi, M. Valdata-Nappi, C. Cerri, R. Fantechi, G. Collazuol, L. DiLella, G. Lamanna, I. Mannelli, A. Michetti, F. Costantini, N. Doble, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, S. Venditti, B. Bloch-Devaux, C. Cheshkov, J.B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, M. Ziolkowski, C. Biino, N. Cartiglia, F. Marchetto, S. Bifani, M. Clemencic, S. Goy Lopez, H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, and L. Widhalm
Subjects: Physics, QC1-999
Abstract: A sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon (A′) production in the π0→γA′ decay followed by the prompt A′→e+e− decay. No signal is observed, and an exclusion region in the plane of the dark photon mass mA′ and mixing parameter ε2 is established. The obtained upper limits on ε2 are more stringent than the previous limits in the mass range 9 MeV/c2
Published: 2015
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5. Latest results on rare kaon decays from the NA48/2 experiment at CERN

Author: E. M. Gersabeck, M. C. Petrucci, C. Cerri, N. Doble, Stoyan Stoynev, W. Kubischta, C. Damiani, G. Marel, D. J. Munday, Rainer Wanke, B. Bloch-Devaux, P. Rubin, M. Ziolkowski, Anne Dabrowski, M. Pepe, A. Winhart, M. Holder, E. C. Swallow, E. Imbergamo, G. Bocquet, Yu. Potrebenikov, A. Michetti, Peter Zahariev Hristov, Konrad Kleinknecht, Emmanuel Monnier, M. Markytan, M. Lenti, B. Renk, C. Lazzeroni, P. Marouelli, F. Marchetto, C. Morales Morales, L. Widhalm, D. Coward, Vladimir Kekelidze, V. Falaleev, M. Valdata-Nappi, G. Ruggiero, A. Peters, Evgueni Goudzovski, B. Vallage, Mayda Velasco, W. Baldini, A. Gonidec, E. Iacopini, V. Kozhuharov, G. Collazuol, N. A. Molokanova, Andreas Alexander Maier, K. Eppard, U. Moosbrugger, S. Venditti, Cvetan Valeriev Cheshkov, S. Shkarovskiy, T. Fonseca Martin, J.B. Cheze, G. Lamanna, H. D. Wahl, Luca Fiorini, Nicolo Cartiglia, S. Balev, M. Martini, M. Fidecaro, R. Fantechi, A. Gianoli, M. Scarpa, I. Mannelli, Ivan Mikulec, Milene Calvetti, B. Peyaud, P. F. Dalpiaz, Fabrizio Petrucci, M. Veltri, S. Goy Lopez, G. E. Kalmus, Marco Clemencic, H. Dibon, Leander Litov, A. Norton, Roland Winston, Simone Bifani, M. Shieh, P.L. Frabetti, M. Wache, L. Masetti, Mauro Raggi, I. Polenkevich, D. T. Madigozhin, M. D. Wood, Alan W. Walker, Mark Slater, E. Mazzucato, F. Costantini, Milena Misheva, Jacqueline Batley, A. Ceccucci, Andrea Bizzeti, Michal Szleper, Nicola Cabibbo, P. Cenci, M. Savrie, J. Derre, Roberta Arcidiacono, G. Neuhofer, M. Behler, M. Patel, D.C. Cundy, A.I. Zinchenko, A. Nappi, M. Raggi, Manfred Jeitler, G. Anzivino, G.M. Pierazzini, L. Gatignon, M. Sozzi, S. A. Wotton, L. DiLella, Cristina Biino, S. Giudici, M. Fiorini, and Mauro Piccini
Subjects: Physics, Particle physics, Large Hadron Collider, High Energy Physics::Experiment, Nuclear Physics - Experiment, Particle Physics - Experiment
Abstract: The NA48/2 experiment at CERN reports the first observation of the K->pi0e+e-decay from an exposure of 1.7x10^11 charged kaon decays recorded in 2003-2004. A sample of 4919candidates with 4.9% background contamination allows the determination of the branching ratioin the full kinematic region. The study of the kinematic space shows evidence for a structuredependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million Ke3 and 2.3 million Km3 events collected in 2004 will also be presented.
Published: 2021

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

Author: V. Kozhuharov, P. Cenci, M. Valdata-Nappi, S. Venditti, M. Shieh, Jacqueline Batley, C. Cerri, G. Collazuol, Manfred Jeitler, J. Derre, N. Doble, U. Moosbrugger, S. Giudici, Roberta Arcidiacono, M. De Beer, Maulik R. Patel, M. Wache, M. Behler, Cristina Lazzeroni, Giuseppe Ruggiero, Rainer Wanke, Augusto Ceccucci, G. Bocquet, Yu. Potrebenikov, Nicola Cabibbo, B. Vallage, M. Slater, C. Cheshkov, A. A. Maier, G. Kalmus, D. T. Madigozhin, S. Goy Lopez, M. Savrie, B. Bloch-Devaux, A. Peters, Lau Gatignon, V. Falaleev, P. L. Frabetti, P. Rubin, E. Imbergamo, E. Mazzucato, A. Norton, Enrico Celeghini, G.M. Pierazzini, Cristina Biino, Ivan Mikulec, F. Costantini, B. Renk, D. Coward, M. Scarpa, Andrea Bizzeti, A. Winhart, M. Szleper, C. Morales Morales, P. F. Dalpiaz, Nicolo Cartiglia, E. C. Swallow, M. D. Wood, M. Veltri, M. Holder, H. Wahl, M. C. Petrucci, Evgueni Goudzovski, E. Iacopini, A. Michetti, Mayda Velasco, I. Polenkevich, M. Ziolkowski, Massimiliano Fiorini, M. Sozzi, M. Fidecaro, A. Nappi, Peter Zahariev Hristov, P. Marouelli, A. I. Zinchenko, C. Damiani, Evelina Gersabeck, Simone Bifani, S. A. Wotton, B. Peyaud, R. Fantechi, Vladimir Kekelidze, L. DiLella, K. Kleinknecht, Anne Dabrowski, A. Gianoli, Leander Litov, W. Baldini, G. Marel, S. Shkarovskiy, M. Markytan, M. Lenti, G. Lamanna, I. Mannelli, Marco Clemencic, Milene Calvetti, R. Winston, M. Pepe, Stoyan Stoynev, A. Gonidec, Giuseppina Anzivino, W. Kubischta, Alan W. Walker, L. Masetti, M. Hita-Hochgesand, E. Monnier, H. Dibon, T. Fonseca Martin, D. J. Munday, Mauro Piccini, S. Balev, N. A. Molokanova, M. Martini, K. Eppard, Mauro Raggi, F. Marchetto, L. Widhalm, A. Cotta Ramusino, G. Neuhofer, D.C. Cundy, F. Petrucci, J.B. Cheze, Luca Fiorini, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and NA48/2
Subjects: Nuclear Theory, S010LQM, S010MSM, Fixed target experiments, Rare decay, K meson, 01 natural sciences, S010LMM, Physics, Particles & Fields, High Energy Physics - Experiment, Economica, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], S010LAM, Nuclear Experiment, Physics, Quantum chromodynamics, form factor, 02 Physical Sciences, Form factor (quantum field theory), semileptonic decay, Kaon, Nuclear & Particles Physics, Fixed target experiments Rare decay, 3. Good health, Rare decay, Nuclear and High Energy Physics, Physical Sciences, Particle Physics - Experiment, Semileptonic decay, Particle physics, S010LPE, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, S010MVM, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, K: semileptonic decay, 010306 general physics, 01 Mathematical Sciences, S010MVE, S010LLM, Science & Technology, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, Ambientale, K meson, S010LPM, S010LQE, NA48, lcsh:QC770-798, High Energy Physics::Experiment, S010L0
Abstract: A measurement of the form factors of charged kaon semileptonic decays is presented, based on $4.4 \times 10^6$ $K^\pm \to \pi^0 e^\pm \nu_e$ ($K^\pm_{e3}$) and $2.3 \times 10^6$ $K^\pm \to \pi^0 \mu^\pm \nu_{\mu}$ ($K^\pm_{\mu3}$) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. The combination of measurements in the $K^\pm_{e3}$ and $K^\pm_{\mu3}$ modes is also presented., Comment: 20 pages , 9 figures, 5 tables
Published: 2018

7. Recent QCD results from the NA48/2 experiment

Author: Andreas Alexander Maier, M. Holder, G. Lamanna, G. Bocquet, Yu. Potrebenikov, Emmanuel Monnier, Augusto Ceccucci, Jacqueline Batley, M. Veltri, Cvetan Valeriev Cheshkov, A. I. Zinchenko, M. Vallage, C. Cerri, S. Venditti, G. Collazuol, P. F. Dalpiaz, A. Gianoli, G. Pierazzini, C. Morales Morales, I. Polenkevich, M. D. Wood, Milene Calvetti, Michal Szleper, Nicolo Cartiglia, Nicola Cabibbo, F. Petrucci, Enrico Celeghini, A. Cotta Ramusino, I. Mannelli, H. Dibon, F. Marchetto, M. Savrie, B. Bloch-Devaux, M. Wache, D. T. Madigozhin, M. Sozzi, Cristina Biino, Ivan Mikulec, L. Widhalm, S. A. Wotton, L. DiLella, M. Ziolkowski, Evgueni Goudzovski, S. Balev, M. Martini, Cristina Lazzeroni, M. C. Petrucci, Mark Slater, M. Patel, Mauro Raggi, E. Mazzucato, E. M. Gersabeck, Massimiliano Fiorini, N. Doble, R. Winston, Giuseppe Ruggiero, E. Imbergamo, L. Masetti, V. Kozhuharov, Peter Zahariev Hristov, M. Misheva, M. Valdata-Nappi, Mauro Piccini, Leander Litov, Simone Bifani, K. Kleinknecht, M. Scarpa, A. Peters, Manfred Jeitler, R. Fantechi, Vladimir Kekelidze, F. Costantini, U. Moosbrugger, P. Rubin, Stoyan Stoynev, B. Renk, D. Coward, H. Wahl, W. Kubischta, P.L. Frabetti, D. J. Munday, G. Anzivino, Mayda Velasco, M. De Beer, Anne Dabrowski, S. Shkarovskiy, T. Fonseca Martin, Andrea Bizzeti, G. Marel, E. Iacopini, G. Neuhofer, Rainer Wanke, Marco Clemencic, M. Fidecaro, C. Damiani, M. Pepe, B. Peyaud, M. Markytan, A. Winhart, M. Lenti, M. Behler, A. Gonidec, Alan W. Walker, E. C. Swallow, N. A. Molokanova, K. Eppard, A. Michetti, V. Falaleev, G.E. Kalmus, A. Nappi, S. Goy Lopez, A. Norton, P. Marouelli, W. Baldini, D. Cundy, J.B. Cheze, Luca Fiorini, P. Cenci, M. Shieh, Lau Gatignon, M. Hita-Hochgesand, J. Derre, Roberta Arcidiacono, R. Marchevski, Giuseppina Anzivino, and S. Giudici
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, 01 natural sciences, Pion, form factors, rare kaon decays, 0103 physical sciences, chiral perturbation theory, CP violation, High Energy Physics::Experiment, 010306 general physics
Abstract: The NA48/2 experiment collected data in 2003 and 2004 with the main purpose to study direct CP violation in charged kaons decaying in three pions. Thanks to the huge statistics collected, other studies are also possible. In this paper two recent results, in the framework of QCD studies, are reported: the measurement of the K ± → π 0 e ± ν Form Factors and the first observation of the rare decay K ± → π ± π 0 e + e − .
Published: 2018

8. Neutral pion form factor measurement by the NA62 experiment

Author: Fabrizio Petrucci, A. Gonidec, Leander Litov, A. Romano, G. Collazuol, P.L. Frabetti, M. Scarpa, M. Hita-Hochgesand, Marco Clemencic, V K Semenov, F. Retire, S. Balev, M. Martini, V. Obraztsov, V. Kozhuharov, B. Hallgren, V. Falaleev, I. Mannelli, Rainer Wanke, M. Shieh, M. Zamkovsky, Alan W. Walker, Roberto Piandani, P. Rubin, Jacqueline Batley, Mark Slater, N. A. Molokanova, Peter Zahariev Hristov, F. Marchetto, N. Doble, O. Yushchenko, A. Winhart, L. Widhalm, L. Masetti, A. Peters, K. Eppard, M. Napolitano, G. Dellacasa, Vladimir Kekelidze, Evgueni Goudzovski, Tomas Blazek, E. C. Swallow, U. Moosbrugger, Antonino Sergi, A. Cotta Ramusino, Evgeny Gushchin, S. Movchan, H. D. Wahl, Simone Bifani, M. Fidecaro, F. Ambrosino, Andreas Alexander Maier, P. F. Dalpiaz, M. Moulson, F. Costantini, B. Peyaud, E. Iacopini, M. C. Petrucci, Petra Riedler, Mauro Piccini, P. Marouelli, A. Michetti, Konrad Kleinknecht, Paolo Massarotti, C. Damiani, T. Spadaro, T. Numao, G. D'Agostini, Ivan Mikulec, V. Palladino, Paolo Valente, M. Veltri, D. Coward, Anne Dabrowski, Viacheslav Duk, G. Lamanna, G. Marel, Emilio Leonardi, M. Pepe, M. Valdata-Nappi, M. Ziolkowski, I. Polenkevich, M. D. Wood, Jürgen Engelfried, Emmanuel Monnier, R. Fantechi, A.I. Zinchenko, M. Markytan, M. Lenti, Milene Calvetti, F. Bucci, A. Ceccucci, M. Holder, H. O. Danielsson, Milena Misheva, Andrea Bizzeti, M. Koval, S. Venditti, V. Bolotov, S. A. Wotton, C. Cerri, H. Dibon, Wander Baldini, G. Bocquet, Yu. Potrebenikov, J. Derr, Cristina Lazzeroni, M. Savri, E. Imbergamo, Maulik R. Patel, A. Antonelli, Mauro Raggi, C. Morales Morales, D. Di Filippo, J. B. Chze, S. Shkarovskiy, T. Fonseca Martin, S. Goy Lopez, A. Salamon, M. Serra, A. Norton, Roland Winston, Massimiliano Fiorini, S. Gallorini, V. Kurshetsov, Nicolo Cartiglia, Stoyan Stoynev, W. Kubischta, D. J. Munday, S. Giudici, M. Sozzi, L. DiLella, Cristina Biino, M. De Beer, M. Wache, D. T. Madigozhin, E. Mazzucato, P. Cenci, M. Behler, Roberta Arcidiacono, Michal Szleper, Nicola Cabibbo, B. Bloch-Devaux, G.E. Kalmus, A. Nappi, Mayda Velasco, Cvetan Valeriev Cheshkov, G. Saracino, E. Gersabeck, B. Renk, Manfred Jeitler, A. Gianoli, G.M. Pierazzini, G. Anzivino, A. Fucci, Lidia Fiorini, B. Vallage, L. Gatignon, I. Popov, G. Neuhofer, D.C. Cundy, Nicolas Lurkin, G. Ruggiero, Zamkovsky, Michal, Ambrosino, F., Antonelli, A., Anzivino, G., Arcidiacono, R., Baldini, W., Balev, S., Batley, J. R., Behler, M., Bifani, S., Biino, C., Bizzeti, A., Blazek, T., Bloch-Devaux, B., Bocquet, G., Bolotov, V., Bucci, F., Cabibbo, N., Calvetti, M., Cartiglia, N., Ceccucci, A., Cenci, P., Cerri, C., Cheshkov, C., Chze, J. B., Clemencic, M., Collazuol, G., Costantini, F., Cotta Ramusino, A., Coward, D., Cundy, D., Dabrowski, A., Dagostini, G., Dalpiaz, P., Damiani, C., Danielsson, H., De Beer, M., Dellacasa, G., Derr, J., Dibon, H., Di Filippo, D., Dilella, L., Doble, N., Duk, V., Engelfried, J., Eppard, K., Falaleev, V., Fantechi, R., Fidecaro, M., Fiorini, L., Fiorini, M., Fonseca Martin, T., Frabetti, P. L., Fucci, A., Gallorini, S., Gatignon, L., Gersabeck, E., Gianoli, A., Giudici, S., Gonidec, A., Goudzovski, E., Goy Lopez, S., Gushchin, E., Hallgren, B., Hita-Hochgesand, M., Holder, M., Hristov, P., Iacopini, E., Imbergamo, E., Jeitler, M., Kalmus, G., Kekelidze, V., Kleinknecht, K., Koval, M., Kozhuharov, V., Kubischta, W., Kurshetsov, V., Lamanna, G., Lazzeroni, C., Lenti, M., Leonardi, E., Litov, L., Lurkin, N., Madigozhin, D., Maier, A., Mannelli, I., Marchetto, F., Marel, G., Markytan, M., Marouelli, P., Martini, M., Masetti, L., Massarotti, P., Mazzucato, E., Michetti, A., Mikulec, I., Misheva, M., Molokanova, N., Monnier, E., Moosbrugger, U., Morales Morales, C., Moulson, M., Movchan, S., Munday, D. J., Napolitano, M., Nappi, A., Neuhofer, G., Norton, A., Numao, T., Obraztsov, V., Palladino, V., Patel, M., Pepe, M., Peters, A., Petrucci, F., Petrucci, M. C., Peyaud, B., Piandani, R., Piccini, M., Pierazzini, G., Polenkevich, I., Popov, I., Potrebenikov, Y., Raggi, M., Renk, B., Retire, F., Riedler, P., Romano, A., Rubin, P., Ruggiero, G., Salamon, A., Saracino, G., Savri, M., Scarpa, M., Semenov, V., Sergi, A., Serra, M., Shieh, M., Shkarovskiy, S., Slater, M. W., Sozzi, M., Spadaro, T., Stoynev, S., Swallow, E., Szleper, M., Valdata-Nappi, M., Valente, P., Vallage, B., Velasco, M., Veltri, M., Venditti, S., Wache, M., Wahl, H., Walker, A., Wanke, R., Widhalm, L., Winhart, A., Winston, R., Wood, M. D., Wotton, S. A., Yushchenko, O., Zinchenko, A., and Ziolkowski, M.
Subjects: Physics, History, Particle physics, 02 Physical Sciences, Meson, 010308 nuclear & particles physics, Nuclear Theory, Form factor (quantum field theory), Elementary particle, NA62 experiment, 01 natural sciences, 09 Engineering, Dark photon, Computer Science Applications, Education, Nuclear physics, Physics and Astronomy (all), Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Lepton, Dimensionless quantity
Abstract: The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from ∼1 million fully reconstructed π 0 Dalitz decay is presented. The limits on dark photon production in π 0 decays from the earlier kaon experiment at CERN, NA48/2, are also reported.
Published: 2017

9. 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

10. 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

11. Study of the rare decay K± ->pi±gg

Author: AMBROSINO, FABIO, DI FILIPPO, DOMENICO, MASSAROTTI, PAOLO, SARACINO, GIULIO, A. Antonelli, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J. R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch Devaux, G. Bocquet, V. Bolotov, F. Bucci, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Cassese, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J. B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, G. D???Agostini, P. Dalpiaz, C. Damiani, H. Danielsson, M. De Beer, G. Dellacasa, J. Derré, H. Dibon, L. DiLella, N. Doble, V. Duk, J. Engelfried, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P. L. Frabetti, A. Fucci, S. Gallorini, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, E. Gushchin, B. Hallgren, M. Hita Hochgesand, M. Holder, P. Hristov, E. Iacopini, E. Imbergamo, M. Jeitler, G. Kalmus, V. Kekelidze, K. Kleinknecht, V. Kozhuharov, W. Kubischta, V. Kurshetsov, G. Lamanna, C. Lazzeroni, M. Lenti, E. Leonardi, L. Litov, D. Madigozhin, A. Maier, I. Mannelli, F. Marchetto, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, E. Mazzucato, A. Michetti, I. Mikulec, M. Misheva, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, M. Moulson, S. Movchan, D. J. Munday, M. Napolitano, A. Nappi, G. Neuhofer, A. Norton, T. Numao, V. Obraztsov, V. Palladino, M. Patel, M. Pepe, A. Peters, F. Petrucci, M. C. Petrucci, B. Peyaud, R. Piandani, M. Piccini, G. Pierazzini, I. Polenkevich, I. Popov, Y.u. Potrebenikov, M. Raggi, B. Renk, F. Retière, P. Riedler, A. Romano, P. Rubin, G. Ruggiero, A. Salamon, M. Savrié, M. Scarpa, V. Semenov, A. Sergi, M. Serra, M. Shieh, S. Shkarovskiy, M. W. Slater, M. Sozzi, T. Spadaro, S. Stoynev, E. Swallow, M. Szleper, M. Valdata Nappi, P. Valente, B. Vallage, M. Velasco, M. Veltri, S. Venditti, M. Wache, H. Wahl, A. Walker, R. Wanke, L. Widhalm, A. Winhart, R. Winston, M. D. Wood, S. A. Wotton, O. Yushchenko, A. Zinchenko, M. Ziolkowski, Ambrosino, Fabio, A., Antonelli, G., Anzivino, R., Arcidiacono, W., Baldini, S., Balev, J. R., Batley, M., Behler, S., Bifani, C., Biino, A., Bizzeti, B., Bloch Devaux, G., Bocquet, V., Bolotov, F., Bucci, N., Cabibbo, M., Calvetti, N., Cartiglia, A., Cassese, A., Ceccucci, P., Cenci, C., Cerri, C., Cheshkov, J. B., Chèze, M., Clemencic, G., Collazuol, F., Costantini, A., Cotta Ramusino, D., Coward, D., Cundy, A., Dabrowski, G., D???agostini, P., Dalpiaz, C., Damiani, H., Danielsson, M., De Beer, G., Dellacasa, J., Derré, H., Dibon, DI FILIPPO, Domenico, L., Dilella, N., Doble, V., Duk, J., Engelfried, K., Eppard, V., Falaleev, R., Fantechi, M., Fidecaro, L., Fiorini, M., Fiorini, T., Fonseca Martin, P. L., Frabetti, A., Fucci, S., Gallorini, L., Gatignon, E., Gersabeck, A., Gianoli, S., Giudici, A., Gonidec, E., Goudzovski, S., Goy Lopez, E., Gushchin, B., Hallgren, M., Hita Hochgesand, M., Holder, P., Hristov, E., Iacopini, E., Imbergamo, M., Jeitler, G., Kalmu, V., Kekelidze, K., Kleinknecht, V., Kozhuharov, W., Kubischta, V., Kurshetsov, G., Lamanna, C., Lazzeroni, M., Lenti, E., Leonardi, L., Litov, D., Madigozhin, A., Maier, I., Mannelli, F., Marchetto, G., Marel, M., Markytan, P., Marouelli, M., Martini, L., Masetti, Massarotti, Paolo, E., Mazzucato, A., Michetti, I., Mikulec, M., Misheva, N., Molokanova, E., Monnier, U., Moosbrugger, C., Morales Morale, M., Moulson, S., Movchan, D. J., Munday, M., Napolitano, A., Nappi, G., Neuhofer, A., Norton, T., Numao, V., Obraztsov, V., Palladino, M., Patel, M., Pepe, A., Peter, F., Petrucci, M. C., Petrucci, B., Peyaud, R., Piandani, M., Piccini, G., Pierazzini, I., Polenkevich, I., Popov, Potrebenikov, Y. u., M., Raggi, B., Renk, F., Retière, P., Riedler, A., Romano, P., Rubin, G., Ruggiero, A., Salamon, Saracino, Giulio, M., Savrié, M., Scarpa, V., Semenov, A., Sergi, M., Serra, M., Shieh, S., Shkarovskiy, M. W., Slater, M., Sozzi, T., Spadaro, S., Stoynev, E., Swallow, M., Szleper, M., Valdata Nappi, P., Valente, B., Vallage, M., Velasco, M., Veltri, S., Venditti, M., Wache, H., Wahl, A., Walker, R., Wanke, L., Widhalm, A., Winhart, R., Winston, M. D., Wood, S. A., Wotton, O., Yushchenko, A., Zinchenko, and M., Ziolkowski
Published: 2014

12. Lepton flavour universality and conservation tests in Kaon decays at CERN

Author: AMBROSINO, FABIO, DI FILIPPO, DOMENICO, MASSAROTTI, PAOLO, SARACINO, GIULIO, A. Antonelli, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J. R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch Devaux, G. Bocquet, V. Bolotov, F. Bucci, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J. B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, G. D???Agostini, P. Dalpiaz, C. Damiani, H. Danielsson, M. De Beer, G. Dellacasa, J. Derré, H. Dibon, L. DiLella, N. Doble, V. Duk, J. Engelfried, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P. L. Frabetti, A. Fucci, S. Gallorini, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, E. Gushchin, B. Hallgren, M. Hita Hochgesand, M. Holder, P. Hristov, E. Iacopini, E. Imbergamo, M. Jeitler, G. Kalmus, V. Kekelidze, K. Kleinknecht, V. Kozhuharov, W. Kubischta, V. Kurshetsov, G. Lamanna, C. Lazzeroni, M. Lenti, E. Leonardi, L. Litov, D. Madigozhin, A. Maier, I. Mannelli, F. Marchetto, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, E. Mazzucato, A. Michetti, I. Mikulec, M. Misheva, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, M. Moulson, S. Movchan, D. J. Munday, M. Napolitano, A. Nappi, G. Neuhofer, A. Norton, T. Numao, V. Obraztsov, V. Palladino, M. Patel, M. Pepe, A. Peters, F. Petrucci, M. C. Petrucci, B. Peyaud, R. Piandani, M. Piccini, G. Pierazzini, I. Polenkevich, I. Popov, Y.u. Potrebenikov, M. Raggi, B. Renk, F. Retière, P. Riedler, A. Romano, P. Rubin, G. Ruggiero, A. Salamon, M. Savrié, M. Scarpa, V. Semenov, A. Sergi, M. Serra, M. Shieh, S. Shkarovskiy, M. W. Slater, M. Sozzi, T. Spadaro, S. Stoynev, E. Swallow, M. Szleper, M. Valdata Nappi, P. Valente, B. Vallage, M. Velasco, M. Veltri, S. Venditti, M. Wache, H. Wahl, A. Walker, R. Wanke, L. Widhalm, A. Winhart, R. Winston, M. D. Wood, S. A. Wotton, O. Yushchenko, A. Zinchenko, M. Z.i.o.l.k.o.w.s.k.i., Ambrosino, Fabio, A., Antonelli, G., Anzivino, R., Arcidiacono, W., Baldini, S., Balev, J. R., Batley, M., Behler, S., Bifani, C., Biino, A., Bizzeti, B., Bloch Devaux, G., Bocquet, V., Bolotov, F., Bucci, N., Cabibbo, M., Calvetti, N., Cartiglia, A., Ceccucci, P., Cenci, C., Cerri, C., Cheshkov, J. B., Chèze, M., Clemencic, G., Collazuol, F., Costantini, A., Cotta Ramusino, D., Coward, D., Cundy, A., Dabrowski, G., D???agostini, P., Dalpiaz, C., Damiani, H., Danielsson, M., De Beer, G., Dellacasa, J., Derré, H., Dibon, DI FILIPPO, Domenico, L., Dilella, N., Doble, V., Duk, J., Engelfried, K., Eppard, V., Falaleev, R., Fantechi, M., Fidecaro, L., Fiorini, M., Fiorini, T., Fonseca Martin, P. L., Frabetti, A., Fucci, S., Gallorini, L., Gatignon, E., Gersabeck, A., Gianoli, S., Giudici, A., Gonidec, E., Goudzovski, S., Goy Lopez, E., Gushchin, B., Hallgren, M., Hita Hochgesand, M., Holder, P., Hristov, E., Iacopini, E., Imbergamo, M., Jeitler, G., Kalmu, V., Kekelidze, K., Kleinknecht, V., Kozhuharov, W., Kubischta, V., Kurshetsov, G., Lamanna, C., Lazzeroni, M., Lenti, E., Leonardi, L., Litov, D., Madigozhin, A., Maier, I., Mannelli, F., Marchetto, G., Marel, M., Markytan, P., Marouelli, M., Martini, L., Masetti, Massarotti, Paolo, E., Mazzucato, A., Michetti, I., Mikulec, M., Misheva, N., Molokanova, E., Monnier, U., Moosbrugger, C., Morales Morale, M., Moulson, S., Movchan, D. J., Munday, M., Napolitano, A., Nappi, G., Neuhofer, A., Norton, T., Numao, V., Obraztsov, V., Palladino, M., Patel, M., Pepe, A., Peter, F., Petrucci, M. C., Petrucci, B., Peyaud, R., Piandani, M., Piccini, G., Pierazzini, I., Polenkevich, I., Popov, Potrebenikov, Y. u., M., Raggi, B., Renk, F., Retière, P., Riedler, A., Romano, P., Rubin, G., Ruggiero, A., Salamon, Saracino, Giulio, M., Savrié, M., Scarpa, V., Semenov, A., Sergi, M., Serra, M., Shieh, S., Shkarovskiy, M. W., Slater, M., Sozzi, T., Spadaro, S., Stoynev, E., Swallow, M., Szleper, M., Valdata Nappi, P., Valente, B., Vallage, M., Velasco, M., Veltri, S., Venditti, M., Wache, H., Wahl, A., Walker, R., Wanke, L., Widhalm, A., Winhart, R., Winston, M. D., Wood, S. A., Wotton, O., Yushchenko, A., Zinchenko, and M. Z. i. o. l. k. o. w. s. k., I.
Subjects: Physics, Particle physics, Large Hadron Collider, Branching fraction, QC1-999, High Energy Physics::Phenomenology, Flavour, NA62 experiment, Lepton number, Helicity, Universality (dynamical systems), Nuclear physics, High Energy Physics::Experiment, Lepton
Abstract: A test of lepton flavour conservation in kaon rare decays by the NA48/2 experiment at CERN SPS is presented. The improved upper limit on the rate of the lepton number violating decay K ± → π ∓ μ ± μ ± is established with the data sample collected in 2003–2004. A precision test of lepton flavour universality in kaon rare decays by the successor NA62 experiment at CERN SPS is reported. The helicity suppressed ratio R K = Γ(K ± → e ± ν )/Γ(K ± → μ ± ν ) is measured with a 0.4% precision using the data sample collected in 2007–2008 and is consistent with the prediction of the Standard Model. The main goal of the NA62 experiment is to measure the branching ratio of the ultra-rare K + → π + ν ν decay with 10% accuracy. This will be achieved by collecting ∼ 1013 K + decays in the fiducial volume. The NA62 estimated sensitivities to rare and forbidden decays of K + and π 0 , including lepton flavour and number violating modes, and the NA62 potential to improve on several experimental limits are discussed.
Published: 2014

13. Precision tests of the Standard Model with Kaon decays at CERN

Author: G. Lamanna, F. Ambrosino, A. Antonelli, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J.R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch-Devaux, G. Bocquet, V. Bolotov, F. Bucci, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J.B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, G. D'Agostini, P. Dalpiaz, C. Damiani, H. Danielsson, M. De Beer, G. Dellacasa, J. Derré, H. Dibon, D. Di Filippo, L. DiLella, N. Doble, V. Duk, J. Engelfried, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P.L. Frabetti, A. Fucci, S. Gallorini, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, E. Gushchin, B. Hallgren, M. Hita-Hochgesand, M. Holder, P. Hristov, E. Iacopini, E. Imbergamo, M. Jeitler, G. Kalmus, V. Kekelidze, K. Kleinknecht, V. Kozhuharov, W. Kubischta, V. Kurshetsov, C. Lazzeroni, M. Lenti, E. Leonardi, L. Litov, D. Madigozhin, A. Maier, I. Mannelli, F. Marchetto, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, P. Massarotti, E. Mazzucato, A. Michetti, I. Mikulec, M. Misheva, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, M. Moulson, S. Movchan, D.J. Munday, M. Napolitano, A. Nappi, G. Neuhofer, A. Norton, T. Numao, V. Obraztsov, V. Palladino, M. Patel, M. Pepe, A. Peters, F. Petrucci, M.C. Petrucci, B. Peyaud, R. Piandani, M. Piccini, G. Pierazzini, I. Polenkevich, I. Popov, Yu. Potrebenikov, M. Raggi, B. Renk, F. Retière, P. Riedler, A. Romano, P. Rubin, G. Ruggiero, A. Salamon, G. Saracino, M. Savrié, M. Scarpa, V. Semenov, A. Sergi, M. Serra, M. Shieh, S. Shkarovskiy, M.W. Slater, M. Sozzi, T. Spadaro, S. Stoynev, E. Swallow, M. Szleper, M. Valdata-Nappi, P. Valente, B. Vallage, M. Velasco, M. Veltri, S. Venditti, M. Wache, H. Wahl, A. Walker, R. Wanke, L. Widhalm, A. Winhart, R. Winston, M.D. Wood, S.A. Wotton, O. Yushchenko, A. Zinchenko, M. Ziolkowski, Lamanna, G., Ambrosino, Fabio, Antonelli, A., Anzivino, G., Arcidiacono, R., Baldini, W., Balev, S., Batley, J. R., Behler, M., Bifani, S., Biino, C., Bizzeti, A., Bloch Devaux, B., Bocquet, G., Bolotov, V., Bucci, F., Cabibbo, N., Calvetti, M., Cartiglia, N., Ceccucci, A., Cenci, P., Cerri, C., Cheshkov, C., Chèze, J. B., Clemencic, M., Collazuol, G., Costantini, F., Cotta Ramusino, A., Coward, D., Cundy, D., Dabrowski, A., D'Agostini, G., Dalpiaz, P., Damiani, C., Danielsson, H., De Beer, M., Dellacasa, G., Derré, J., Dibon, H., DI FILIPPO, Domenico, Dilella, L., Doble, N., Duk, V., Engelfried, J., Eppard, K., Falaleev, V., Fantechi, R., Fidecaro, M., Fiorini, L., Fiorini, M., Fonseca Martin, T., Frabetti, P. L., Fucci, A., Gallorini, S., Gatignon, L., Gersabeck, E., Gianoli, A., Giudici, S., Gonidec, A., Goudzovski, E., Goy Lopez, S., Gushchin, E., Hallgren, B., Hita Hochgesand, M., Holder, M., Hristov, P., Iacopini, E., Imbergamo, E., Jeitler, M., Kalmus, G., Kekelidze, V., Kleinknecht, K., Kozhuharov, V., Kubischta, W., Kurshetsov, V., Lazzeroni, C., Lenti, M., Leonardi, E., Litov, L., Madigozhin, D., Maier, A., Mannelli, I., Marchetto, F., Marel, G., Markytan, M., Marouelli, P., Martini, M., Masetti, L., Massarotti, Paolo, Mazzucato, E., Michetti, A., Mikulec, I., Misheva, M., Molokanova, N., Monnier, E., Moosbrugger, U., Morales Morales, C., Moulson, M., Movchan, S., Munday, D. J., Napolitano, Marco, Nappi, A., Neuhofer, G., Norton, A., Numao, T., Obraztsov, V., Palladino, Vito, Patel, M., Pepe, M., Peters, A., Petrucci, F., Petrucci, M. C., Peyaud, B., Piandani, R., Piccini, M., Pierazzini, G., Polenkevich, I., Popov, I., Potrebenikov, Y. u., Raggi, M., Renk, B., Retière, F., Riedler, P., Romano, A., Rubin, P., Ruggiero, G., Salamon, A., Saracino, Giulio, Savrié, M., Scarpa, M., Semenov, V., Sergi, A., Serra, M., Shieh, M., Shkarovskiy, S., Slater, M. W., Sozzi, M., Spadaro, T., Stoynev, S., Swallow, E., Szleper, M., Valdata Nappi, M., Valente, P., Vallage, B., Velasco, M., Veltri, M., Venditti, S., Wache, M., Wahl, H., Walker, A., Wanke, R., Widhalm, L., Winhart, A., Winston, R., Wood, M. D., Wotton, S. A., Yushchenko, O., Zinchenko, A., and Ziolkowski, M.
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Large Hadron Collider, kaon decays, 010308 nuclear & particles physics, Physics beyond the Standard Model, Flavor-changing neutral current, kaon decays, lepton number violation, High Energy Physics::Phenomenology, Clean environment, NA62 experiment, 01 natural sciences, Standard Model, Nuclear physics, lepton number violation, Kaon Physics, Lepton Flavour Violation, NA62, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Particle Physics - Phenomenology, Lepton
Abstract: Effects of new physics in flavor could be found both in Flavor Changing Neutral Current (FCNC) processes and in Lepton Flavor Violation (LFV) modes. The former offer the possibility to deeply test the standard model in a clean environment, while the latter are sensitive to contribution from several models beyond the standard model. In the Kaon sector both FCNC and LFV will be investigated in the NA62 experiment. In addition the kaons sector is an ideal place where to look for new particles and tiny effects, in the region of hundreds of MeV/ c 2 . In this paper prospects for exotic searches in NA62 will be presented, together with recent results from NA48/2 and NA62-RK on LFV kaon decays modes.
Published: 2016

14. Model independent measurement of the leptonic kaon decay $K^{\pm}\to \mu^{\pm}\nu_{\mu}e^{+} e^-$ with the NA48/2 experiment

Author: Radoslav Marchevski, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J.R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch-Devaux, G. Bocquet, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J.B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, P. Dalpiaz, C. Damiani, M. De Beer, J. Derré, H. Dibon, L. DiLella, N. Doble, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P.L. Frabetti, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, M. Holder, P. Hristov, E. Iacopini, E. Imbergamo, M. Jeitler, G. Kalmus, V. Kekelidze, K. Kleinknecht, V. Kozhuharov, W. Kubischta, G. Lamanna, C. Lazzeroni, M. Lenti, L. Litov, D. Madigozhin, A. Maier, I. Mannelli, F. Marchetto, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, E. Mazzucato, A. Michetti, I. Mikulec, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, D.J. Munday, A. Nappi, G. Neuhofer, A. Norton, M. Patel, M. Pepe, A. Peters, F. Petrucci, M.C. Petrucci, B. Peyaud, M. Piccini, G. Pierazzini, I. Polenkevich, Yu. Potrebenikov, M. Raggi, B. Renk, P. Rubin, Giuseppe Ruggiero, M. Savrié, M. Scarpa, M. Shieh, M.W. Slater, M. Sozzi, S. Stoynev, E. Swallow, M. Szleper, M. Valdata-Nappi, B. Vallage, M. Velasco, M. Veltri, S. Venditti, M. Wache, H. Wahl, A. Walker, R. Wanke, L. Widhalm, A. Winhart, R. Winston, M.D. Wood, S.A. Wotton, A. Zinchenko, and M. Ziolkowski
Subjects: Quantum chromodynamics, Physics, Particle physics, Chiral perturbation theory, Low energy, Branching fraction, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: A measurement of the branching ratio of the rare leptonic kaon decay $K^\pm \rightarrow \mu^\pm \nu_{\mu} e^+ e^- $ is presented using data collected by the NA48/2 experiment in 2003 and 2004. The measurement is performed in the region $M_{ee} > 140$~MeV/c$^2$. In this particular region low energy QCD contributions become important and can be calculated in the framework of Chiral Perturbation Theory (ChPT). From a total number of $1.56 \times 10^{11}$ recorded kaon decays, the branching ratio is measured to be $\mathcal{B} \left( K^\pm \rightarrow \mu^\pm \nu_{\mu} e^+ e^- | M_{ee} > 140~ MeV/c^2 \right) = (7.8 \pm 0.2) \times 10^{-8} $.
Published: 2016

15. Searches for lepton number violation and resonances in $K^\pm \to \pi \mu \mu$ decays with the NA48/2 experiment

Author: N. A. Molokanova, K. Eppard, M. Wache, C. Cerri, A. Nappi, D. T. Madigozhin, E. M. Gersabeck, S. Venditti, E. Mazzucato, V. Kozhuharov, B. Bloch-Devaux, Peter Zahariev Hristov, N. Doble, M. De Beer, P. Cenci, Anne Dabrowski, M. Pepe, C. Morales Morales, Marco Clemencic, Vladimir Kekelidze, M. Sozzi, S. A. Wotton, M. Shieh, M. Holder, Andreas Alexander Maier, Simone Bifani, E. Iacopini, A. Michetti, C. Damiani, A. Gonidec, B. Vallage, L. DiLella, M. Behler, M. Scarpa, G. Bocquet, Mark Slater, Fabrizio Petrucci, H. D. Wahl, G. Collazuol, Giuseppe Ruggiero, Mayda Velasco, J. Derre, Leander Litov, Konrad Kleinknecht, M. Fidecaro, M. Patel, Jacqueline Batley, G.M. Pierazzini, P.L. Frabetti, B. Peyaud, A. Peters, F. Costantini, Cvetan Valeriev Cheshkov, Roberta Arcidiacono, Emmanuel Monnier, D. Coward, Rainer Wanke, P. Rubin, R. Fantechi, M. Valdata-Nappi, I. Mannelli, Alan W. Walker, P. F. Dalpiaz, G. E. Kalmus, F. Marchetto, Manfred Jeitler, Milene Calvetti, Michal Szleper, R. Marchevski, Nicola Cabibbo, I. Polenkevich, L. Widhalm, M. Ziolkowski, A. Gianoli, M. Savrie, M. D. Wood, Cristina Biino, A. Winhart, U. Moosbrugger, P. Marouelli, Ivan Mikulec, E. Imbergamo, H. Dibon, E. C. Swallow, G. Anzivino, Stoyan Stoynev, W. Kubischta, L. Masetti, L. Gatignon, A.I. Zinchenko, D. J. Munday, B. Renk, S. Giudici, Mauro Raggi, Yu Potrebenikov, G. Marel, S. Balev, M. Martini, G. Neuhofer, A. Ceccucci, A. Cotta Ramusino, Andrea Bizzeti, W. Baldini, D.C. Cundy, V. Falaleev, M. Veltri, J.B. Cheze, G. Lamanna, S. Goy Lopez, Luca Fiorini, A. Norton, Roland Winston, Nicolo Cartiglia, Evgueni Goudzovski, T. Fonseca Martin, Mauro Piccini, C. Lazzeroni, K. Massri, M. Markytan, M. Lenti, M. Fiorini, and M. C. Petrucci
Subjects: Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Branching fraction, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Lepton number, Charged particle, Particle Physics - Experiment, Large sample, Lepton
Abstract: The NA48/2 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2003-2004. An upper limit of $8.6 \times 10^{-11}$ at 90~$\%$~CL is set on the branching ratio of the lepton number violating decay $K^\pm \rightarrow \pi^{\mp} \mu^{\pm} \mu^{\pm}$. Searches for two-body resonances like heavy neutral leptons and inflatons in the $K^\pm \rightarrow \pi \mu \mu$ decays in the accessible range of masses and lifetimes are also presented.
Published: 2016

16. 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

17. 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

18. New precise measurements of the and decay asymmetries

Author: 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

19. 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

20. Measurement of the polarization of the Ξ0 (Ξ0¯) hyperon beam by the NA48/1 experiment

Author: 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

21. 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

22. 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

23. Measurements of charged kaon semileptonic decay branching fractions K±→π0μ±ν and K±→π0e±ν and their ratio

Author: G. Ruggiero, G.M. Pierazzini, Evgueni Goudzovski, A. Gonidec, Peter Zahariev Hristov, G. Collazuol, Fabrizio Petrucci, V. Falaleev, Manfred Jeitler, G. Anzivino, P. F. Dalpiaz, B. Vallage, Cristina Biino, M. Fiorini, L. Gatignon, M. Scarpa, Mayda Velasco, Leander Litov, Enrico Celeghini, A.I. Zinchenko, A. Dabrowski, M. Sozzi, R. Fantechi, Maulik R. Patel, M. C. Petrucci, E. Monnier, A. Winhart, Jacqueline Batley, T. Fonseca Martin, Cvetan Valeriev Cheshkov, F. Marchetto, Mauro Piccini, S. A. Wotton, Milene Calvetti, L. Widhalm, G. Marel, M. De Beer, U. Moosbrugger, L. DiLella, A. Gianoli, Alan W. Walker, A. Cotta Ramusino, I. Mannelli, Rainer Wanke, H. Dibon, A. Peters, M. Markytan, M. Lenti, Konrad Kleinknecht, E. Marinova, M. Wache, D. T. Madigozhin, G. Neuhofer, Ivan Mikulec, M. Holder, Mauro Raggi, J. Derre, E. Mazzucato, N. A. Molokanova, D.C. Cundy, K. Eppard, Stoyan Stoynev, M. Behler, D. Coward, M. Valdata-Nappi, W. Kubischta, E. C. Swallow, G. Lamanna, M. Szleper, L. Masetti, Roberta Arcidiacono, D. J. Munday, M. Pepe, E. Iacopini, S. Giudici, Luca Fiorini, J. B. Cheze, B. Renk, G. Bocquet, E. Imbergamo, S. Balev, M. Martini, P. L. Frabetti, P. Rubin, Simone Bifani, P. Cenci, C. Morales, A. Michetti, Nicola Cabibbo, V. Kozhuharov, C. Lazzeroni, M. Savrie, M. Ziolkowski, V. Kekelidze, M. Shieh, H. D. Wahl, M. Fidecaro, B. Peyaud, A. Ceccucci, B. Bloch-Devaux, A. A. Maier, Andrea Bizzeti, F. Martelli, Nicolo Cartiglia, M. Veltri, S. Goy Lopez, A. Norton, Roland Winston, P. Marouelli, W. Baldini, I. Polenkevich, M. D. Wood, N. Doble, Mark Slater, F. Costantini, C. Damiani, C. Cerri, and Marco Clemencic
Subjects: semileptonic kaon decays, CKM matrix, Semileptonic decay, Particle physics, Physics and Astronomy (miscellaneous), kaon decay, BRANCHING FRACTION, Branching (polymer chemistry), NO, High Energy Physics - Experiment, mesoni K, Nuclear physics, decadimenti, MONTE-CARLO, RADIATIVE-CORRECTIONS, PHOTOS, Pi, Kaon decays, Engineering (miscellaneous), Physics, Science & Technology, Unitarity, Cabibbo–Kobayashi–Maskawa matrix, PHYSICS, PARTICLES & FIELDS, semileptonic decay, semileptonic kaon decays, CKM matrix, Physical Sciences
Abstract: Measured ratios of decay rates for Ke3/K2\pi, K\mu3/K2\pi and K\mu3/Ke3 are presented. These measurements are based on K^+- decays collected in a dedicated run in 2003 by the NA48/2 experiment at CERN. The results obtained are Ke3/K2\pi = 0.2470 +/- 0.0009 (stat) +/- 0.0004 (syst) and K\mu3/K2\pi = 0.1637 +/- 0.0006 (stat) +/- 0.0003 (syst). Using the PDG average for the K^+- -> \pi^+-\pi^0 normalisation mode, both values are found to be larger than the current values given by the Particle Data Book and lead to a larger magnitude of the |V_{us}| CKM element than previously accepted. When combined with the latest Particle Data Book value of |V_{ud}|, the result is in agreement with unitarity of the CKM matrix. In addition, a new measured value of K\mu3/Ke3 = 0.663 +/- 0.003(stat) +/- 0.001(syst) is compared to the semi-empirical predictions based on the latest form factor measurements., Comment: 20 pages, 5 tables, 10 figures. Published in European Physical Journal C 50 2 (2007), contains erratum submitted to European Physical Journal C
Published: 2007

24. 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

25. Search for the dark photon in π0 decays

Author: Enrico Celeghini, C. Damiani, H. D. Wahl, A. A. Maier, P. Marouelli, M. Fidecaro, E. Imbergamo, U. Moosbrugger, A. Dabrowski, B. Peyaud, M. C. Petrucci, W. Baldini, E. Monnier, G. Bocquet, V. Falaleev, M. Piccini, N. Doble, N. A. Molokanova, K. Eppard, Cristina Lazzeroni, D. Coward, I. Mannelli, L. Gatignon, M. Markytan, S. Venditti, D.J. Munday, Nicolo Cartiglia, P. L. Frabetti, V. Kekelidze, M. Scarpa, Giuseppe Ruggiero, M. Shieh, S. A. Wotton, G. Pierazzini, S. Stoynev, Milene Calvetti, A. Norton, M. Szleper, F. Marchetto, A. Michetti, A. Ceccucci, M. Pepe, G. Marel, P. Hristov, M. Veltri, Evelina Gersabeck, A. Cotta Ramusino, Maulik R. Patel, M. De Beer, Evgueni Goudzovski, S. Goy Lopez, Roland Winston, J.B. Cheze, H. Dibon, W. Kubischta, A. Gonidec, A. Winhart, T. Fonseca Martin, M. Holder, G. Collazuol, Luca Fiorini, F. Costantini, Konrad Kleinknecht, Andrea Bizzeti, R. Fantechi, P. F. Dalpiaz, M. Lenti, M. Valdata-Nappi, P. Cenci, Leander Litov, Mauro Raggi, M. Ziolkowski, G. Lamanna, S. Balev, M. Martini, J. Derre, Alan W. Walker, Roberta Arcidiacono, Marco Clemencic, E. Iacopini, E. C. Swallow, I. Polenkevich, M. D. Wood, L. Widhalm, M. Behler, Simone Bifani, Massimiliano Fiorini, M.W. Slater, A. Peters, A. Zinchenko, Cristina Biino, Ivan Mikulec, R. Wanke, J. R. Batley, Nicola Cabibbo, C. Cheshkov, V. Kozhuharov, M. Sozzi, M. Savrie, L. DiLella, B. Bloch-Devaux, G.E. Kalmus, A. Nappi, A. Gianoli, B. Vallage, M. Wache, C. Cerri, B. Renk, Yu. Potrebenikov, D. Madigozhin, P. Rubin, Manfred Jeitler, S. Giudici, G. Anzivino, E. Mazzucato, L. Masetti, F. Petrucci, C. Morales Morales, Mayda Velasco, G. Neuhofer, and D.C. Cundy
Subjects: Nuclear and High Energy Physics, Dark matter, KAON DECAYS, Socio-culturale, Astronomy & Astrophysics, 01 natural sciences, Dark photon, dark matter, High Energy Physics - Experiment, Physics, Particles & Fields, Nuclear physics, 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, 0103 physical sciences, dark matter, meson decays, 010306 general physics, DETECTOR, Physics, Nuclear and High Energy Physics, dark photon, photon, pion, neutral pion, neutral pion, Range (particle radiation), Large Hadron Collider, Science & Technology, 010308 nuclear & particles physics, photon, Dark Photon, pion, meson decays, Nuclear & Particles Physics, lcsh:QC1-999, Physics, Nuclear, Physical Sciences, dark photon, Fotone, High Energy Physics::Experiment, Particle Physics - Experiment, lcsh:Physics
Abstract: A sample of $1.69\times 10^7$ fully reconstructed $\pi^0\to\gamma e^+e^-$ decay candidates collected by the NA48/2 experiment at CERN in 2003--2004 is analysed to search for the dark photon ($A'$) production in the $\pi^0\to\gamma A'$ decay followed by the prompt $A'\to e^+e^-$ decay. No signal is observed, and an exclusion region in the plane of the dark photon mass $m_{A'}$ and mixing parameter $\varepsilon^2$ is established. The obtained upper limits on $\varepsilon^2$ are more stringent than the previous limits in the mass range $9~{\rm MeV}/c^2, Comment: Revised version accepted for publication in Physics Letter B
Published: 2015

26. 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

27. 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

28. 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

29. Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties

Author: W. Kubischta, G.M. Pierazzini, D. J. Munday, E. Iacopini, M. Scarpa, Enrico Celeghini, P. L. Frabetti, E. Monnier, A. Dabrowski, Cristina Lazzeroni, Manfred Jeitler, R. Fantechi, Rainer Wanke, M. C. Petrucci, Marco Clemencic, Milene Calvetti, M. Holder, G. Anzivino, A. Michetti, A. Ceccucci, F. Marchetto, P. Rubin, Nicolo Cartiglia, S. Venditti, Fabrizio Petrucci, Andrea Bizzeti, H. Dibon, U. Moosbrugger, A. Winhart, Leander Litov, Cristina Biino, T. Fonseca Martin, L. Widhalm, M. Shieh, Mauro Piccini, Mauro Raggi, C. Damiani, S. Stoynev, E. C. Swallow, G. Neuhofer, Maulik R. Patel, A. A. Maier, M. Sozzi, A. Nappi, G. Bocquet, S. A. Wotton, Jacqueline Batley, D.C. Cundy, H. D. Wahl, L. DiLella, Massimiliano Fiorini, V. Falaleev, D. Coward, Alan W. Walker, M. Fidecaro, B. Peyaud, M. Szleper, I. Polenkevich, M. Slater, M. D. Wood, P. Hristov, N. A. Molokanova, Evelina Gersabeck, K. Eppard, S. Balev, M. Martini, S. Giudici, J.B. Cheze, C. Cerri, Evgueni Goudzovski, M. Ziolkowski, N. Doble, Luca Fiorini, Giuseppe Ruggiero, G. Marel, P. Marouelli, W. Baldini, F. Costantini, M. Veltri, S. Goy Lopez, A. Norton, Roland Winston, Simone Bifani, M. Markytan, M. Lenti, Lau Gatignon, M. Pepe, B. Vallage, Konrad Kleinknecht, E. Imbergamo, M. Valdata-Nappi, P. Cenci, A. Gonidec, G. Collazuol, P. F. Dalpiaz, J. Derre, A. Cotta Ramusino, M. Gersabeck, Roberta Arcidiacono, Vladimir Kekelidze, M. Wache, G. Lamanna, D. T. Madigozhin, G. Kalmus, A. Peters, Ivan Mikulec, M. De Beer, Yu. Potrebenikov, E. Mazzucato, M. Behler, A. I. Zinchenko, A. Gianoli, Nicola Cabibbo, C. Cheshkov, V. Kozhuharov, M. Savrie, B. Bloch-Devaux, I. Mannelli, C. Morales Morales, L. Masetti, B. Renk, and Mayda Velasco
Subjects: Physics, Nuclear and High Energy Physics, Branching fraction, Fixed target experiments, Flavor physics, Rare decay, Plane (geometry), Hadron, Form factor (quantum field theory), kaon decay, semileptonic decay, Distribution (mathematics), Radiative transfer, Invariant mass, Atomic physics, Order of magnitude
Abstract: A sample of 65210 K ± → π 0 π 0 e ± ν (K e4 00 ) decay candidates with 1% background contamination has been collected in 2003-2004 by the NA48/2 collaboration at the CERN SPS. A study of the differential rate provides the first measurement of the hadronic form factor variation in the plane (M 2 , M 2 ) and brings evidence for a cusp-like structure in the distribution of the squared π 0 π 0 invariant mass around $$ 4{m}_{\pi^{+}}^2 $$ . Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the K ± → π 0 π 0 π ± decay mode as normalization. It is measured to be BR(K e4 00 ) = (2.552 ± 0.010stat ± 0.010syst ± 0.032ext) × 10−5, which improves the current world average precision by an order of magnitude while the 1.4% relative precision is dominated by the external uncertainty from the normalization mode. A comparison with the properties of the corresponding mode involving a π + π − pair (K e4 + − ) is also presented.
Published: 2014

30. Recent results and prospects on kaon physics at CERN

Author: Augusto Ceccucci, H. Wahl, V. Bolotov, B. Renk, Tommaso Spadaro, Mayda Velasco, M. Sozzi, E. Imbergamo, P. Rubin, P. F. Dalpiaz, S. Movchan, F. Ambrosino, S. A. Wotton, E. Iacopini, L. DiLella, F. Bucci, Andreas Alexander Maier, V. Obraztsov, G. Lamanna, Milena Misheva, D. Di Filippo, G. Marel, V. E. Semenov, J.B. Cheze, A. Cotta Ramusino, Cvetan Valeriev Cheshkov, A. I. Zinchenko, Cristina Lazzeroni, O. Yushchenko, Luca Fiorini, Antonino Sergi, A. Antonelli, I. Mannelli, A. Gianoli, N. Doble, Milene Calvetti, Cristina Biino, Ivan Mikulec, G. DʼAgostini, R. Winston, Mauro Piccini, M. Holder, V. Palladino, D. Coward, Paolo Massarotti, V. Kurshetsov, Evgueni Goudzovski, A. Peters, Emmanuel Monnier, P. Cenci, Roberto Piandani, L. Masetti, Rainer Wanke, Jacqueline Batley, M. Markytan, M. Lenti, H. Dibon, G. Neuhofer, M. Wache, Jürgen Engelfried, V. Falaleev, M. Shieh, M. Valdata-Nappi, M. Scarpa, Viacheslav Duk, D. T. Madigozhin, Peter Zahariev Hristov, C. Cerri, A. Winhart, H. O. Danielsson, F. Petrucci, Mauro Raggi, E. Mazzucato, E. C. Swallow, R. Fantechi, U. Moosbrugger, Vladimir Kekelidze, C. Morales Morales, B. Vallage, P. Marouelli, M. C. Petrucci, Simone Bifani, M. Hita-Hochgesand, T. Numao, Stoyan Stoynev, W. Baldini, W. Kubischta, G. Bocquet, Yu. Potrebenikov, D. J. Munday, D.C. Cundy, S. Balev, M. Martini, K. Kleinknecht, S. Goy Lopez, A. Salamon, M. Serra, A. Norton, Massimiliano Fiorini, S. Gallorini, S. Venditti, G. Collazuol, F. Retiere, C. Damiani, Nicolo Cartiglia, I. Popov, M. Ziolkowski, V. Kozhuharov, G.M. Pierazzini, A. Fucci, M. De Beer, M. Veltri, Emilio Leonardi, I. Polenkevich, M. D. Wood, M. Behler, Mark Slater, Michal Szleper, G. Dellacasa, Giuseppe Ruggiero, Nicola Cabibbo, M. Savrie, B. Bloch-Devaux, F. Costantini, Lau Gatignon, J. Derre, M. Patel, Roberta Arcidiacono, S. Shkarovskiy, T. Fonseca Martin, E. Gushchin, Marco Clemencic, A. Gonidec, A. Romano, Leander Litov, P.L. Frabetti, M. Pepe, B. Hallgren, Paolo Valente, Alan W. Walker, M. Moulson, Andrea Bizzeti, F. Marchetto, A. Michetti, L. Widhalm, M. Fidecaro, N. A. Molokanova, B. Peyaud, K. Eppard, Petra Riedler, G. E. Kalmus, M. Napolitano, E. M. Gersabeck, Anne Dabrowski, G. Saracino, Manfred Jeitler, S. Giudici, G. Anzivino, A. Nappi, and Ambrosino, Fabio
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Particle physics, Large Hadron Collider, Meson, Hadron, Elementary particle, Fermion, NA62 experiment, Atomic and Molecular Physics, and Optics, Lepton
Abstract: A review of recent experimental results on charged kaon decays from NA48/2 and NA62 collaborations is given, together with a description of the NA62 experiment to study the ultra-rare decay K + → π + ν ν ¯ starting in fall 2014.
Published: 2013

31. Kaons at CERN: recent results and prospects

Author: AMBROSINO, FABIO, DI FILIPPO, DOMENICO, MASSAROTTI, PAOLO, SARACINO, GIULIO, A. Antonelli, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J. R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch Devaux, G. Bocquet, V. Bolotov, F. Bucci, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J. B. Chèze, M. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, G. D???Agostini, P. Dalpiaz, C. Damiani, H. Danielsson, M. De Beer, G. Dellacasa, J. Derré, H. Dibon, L. DiLella, N. Doble, V. Duk, J. Engelfried, K. Eppard, V. Falaleev, R. Fan techi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P. L. Frabetti, A. Fucci, S. Gallorini, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, E. Gushchin, B. Hallgren, M. Hita Hochgesand, M. Holder, P. Hristov, E. Iacopini, E. Imbergamo, M. Jeitler, G. Kalmus, V. Kekelidze, K. Kleinknecht, V. Kozhuharov, W. Kubischta, V. Kurshetsov, G. Lamanna, C. Lazzeroni, M. Lenti, E. Leonardi, L. Litov, D. Madigozhin, A. Maier, I. Mannelli, F. Marchetto, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, E. Mazzucato, A. Michetti, I. Mikulec, M. Mi sheva, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, M. Moulson, S. Movchan, D. J. Munday, M. Napoli tano, A. Nappi, G. Neuhofer, A. Norton, T. Numao, V. Obraztsov, V. Palladino, M. Patel, M. Pepe, A. Peters, F. Petrucci, M. C. Petrucci, B. Peyaud, R. Piandani, M. Piccini, G. Pierazzini, I. Polenkevich, I. Popov, Y.u. Potrebenikov, M. Raggi, B. Renk, F. Retière, P. Riedler, A. Romano, P. Rubin, G. Ruggiero, A. Salamon, M. Savrié, M. Scarpa, V. Se menov, A. Sergi, M. Serra, M. Shieh, S. Shkarovskiy, M. W. Slater, M. Sozzi, T. Spadaro, S. Stoynev, E. Swallow, M. Szleper, M. Valdata Nappi, P. Valente, B. Vallage, M. Velasco, M. Veltri, S. Venditti, M. Wache, H. Wahl, A. Walker, R. Wanke, L. Wid halm, A. Winhart, R. Winston, M. D. Wood, S. A. Wotton, O. Yushchenko, A. Zinchenko, M. Z.i.o.l.k.o.w.s.k.i., Ambrosino, Fabio, A., Antonelli, G., Anzivino, R., Arcidiacono, W., Baldini, S., Balev, J. R., Batley, M., Behler, S., Bifani, C., Biino, A., Bizzeti, B., Bloch Devaux, G., Bocquet, V., Bolotov, F., Bucci, N., Cabibbo, M., Calvetti, N., Cartiglia, A., Ceccucci, P., Cenci, C., Cerri, C., Cheshkov, J. B., Chèze, M., Clemencic, G., Collazuol, F., Costantini, A., Cotta Ramusino, D., Coward, D., Cundy, A., Dabrowski, G., D???agostini, P., Dalpiaz, C., Damiani, H., Danielsson, M., De Beer, G., Dellacasa, J., Derré, H., Dibon, DI FILIPPO, Domenico, L., Dilella, N., Doble, V., Duk, J., Engelfried, K., Eppard, V., Falaleev, R., Fan techi, M., Fidecaro, L., Fiorini, M., Fiorini, T., Fonseca Martin, P. L., Frabetti, A., Fucci, S., Gallorini, L., Gatignon, E., Gersabeck, A., Gianoli, S., Giudici, A., Gonidec, E., Goudzovski, S., Goy Lopez, E., Gushchin, B., Hallgren, M., Hita Hochgesand, M., Holder, P., Hristov, E., Iacopini, E., Imbergamo, M., Jeitler, G., Kalmu, V., Kekelidze, K., Kleinknecht, V., Kozhuharov, W., Kubischta, V., Kurshetsov, G., Lamanna, C., Lazzeroni, M., Lenti, E., Leonardi, L., Litov, D., Madigozhin, A., Maier, I., Mannelli, F., Marchetto, G., Marel, M., Markytan, P., Marouelli, M., Martini, L., Masetti, Massarotti, Paolo, E., Mazzucato, A., Michetti, I., Mikulec, M., Mi sheva, N., Molokanova, E., Monnier, U., Moosbrugger, C., Morales Morale, M., Moulson, S., Movchan, D. J., Munday, M., Napoli tano, A., Nappi, G., Neuhofer, A., Norton, T., Numao, V., Obraztsov, V., Palladino, M., Patel, M., Pepe, A., Peter, F., Petrucci, M. C., Petrucci, B., Peyaud, R., Piandani, M., Piccini, G., Pierazzini, I., Polenkevich, I., Popov, Potrebenikov, Y. u., M., Raggi, B., Renk, F., Retière, P., Riedler, A., Romano, P., Rubin, G., Ruggiero, A., Salamon, Saracino, Giulio, M., Savrié, M., Scarpa, V., Se menov, A., Sergi, M., Serra, M., Shieh, S., Shkarovskiy, M. W., Slater, M., Sozzi, T., Spadaro, S., Stoynev, E., Swallow, M., Szleper, M., Valdata Nappi, P., Valente, B., Vallage, M., Velasco, M., Veltri, S., Venditti, M., Wache, H., Wahl, A., Walker, R., Wanke, L., Wid halm, A., Winhart, R., Winston, M. D., Wood, S. A., Wotton, O., Yushchenko, A., Zinchenko, and M. Z. i. o. l. k. o. w. s. k., I.
Subjects: Nuclear physics, Physics, Particle physics, Large Hadron Collider, Chiral perturbation theory, teoria perturbativa chirale, Branching fraction, QC1-999, rare kaon decays, High Energy Physics::Experiment, Standard Model
Abstract: The NA48/2 and NA62 experiments at CERN study rare kaon decays using the decay in ﬂight technique. In this paper two selected topics will be presented: new measurements performed by the two experiments of the K±→ π±γγ decay which represents a stringent test of the Chiral Perturbation Theory and the measurement of the Branching Ratio of the very rare decay K+→π+νν¯${K^ + } \to {\pi ^ + }\nu \bar \nu $ at 10% level, that will provide a test of the Standard Model and possible extensions beyond it.
Published: 2014

32. Measurement of the direct emission and interference terms and search for CP violation in the decay K-+/- -> pi(+/-)pi(0)gamma

Author: R. Fantechi, M. Sozzi, S. A. Wotton, Milene Calvetti, Michael Ziolkowski, L. DiLella, H. Dibon, Mauro Raggi, A. Winhart, G. Ruggiero, Manfred Jeitler, N. A. Molokanova, A. A. Maier, K. Eppard, T. Fonseca Martin, Mauro Piccini, J.B. Cheze, A. Gonidec, S. Giudici, G. Anzivino, Luca Fiorini, G. Collazuol, I. Polenkevich, M. D. Wood, C. Morales Morales, P. Rubin, M. Szleper, P. L. Frabetti, J. Derre, G. Neuhofer, Jacqueline Batley, G. Bocquet, Yu. Potrebenikov, E. Iacopini, G. Kalmus, A. Peters, A. Ceccucci, Roberta Arcidiacono, Andrea Bizzeti, A. Michetti, C. Damiani, M. Holder, Cristina Biino, Ivan Mikulec, M. Slater, Lau Gatignon, Fabrizio Petrucci, P. Marouelli, Mayda Velasco, A. Nappi, P. F. Dalpiaz, B. Renk, H. D. Wahl, Leander Litov, D.C. Cundy, M. Fidecaro, M. Shieh, Stoyan Stoynev, W. Kubischta, P. Cenci, M. Wache, B. Peyaud, F. Marchetto, Evgueni Goudzovski, D. T. Madigozhin, D. J. Munday, M. Markytan, M. Lenti, L. Widhalm, Lucia Masetti, U. Moosbrugger, F. Costantini, B. Vallage, Peter Zahariev Hristov, Alan W. Walker, E. Mazzucato, E. Monnier, W. Baldini, Massimiliano Fiorini, A. I. Zinchenko, M. Pepe, Nicolo Cartiglia, A. Gianoli, Enrico Celeghini, Cristina Lazzeroni, C. Cerri, A. Dabrowski, M. C. Petrucci, E. Marinova, G.M. Pierazzini, N. Doble, C. Cheshkov, Marco Clemencic, I. Mannelli, G. Lamanna, V. Kekelidze, M. Veltri, S. Goy Lopez, A. Norton, Roland Winston, M. Scarpa, Nicola Cabibbo, V. Kozhuharov, M. Savrie, B. Bloch-Devaux, M. De Beer, M. Behler, A. Cotta Ramusino, E. Imbergamo, V. Falaleev, S. Balev, M. Martini, S. Venditti, Maulik R. Patel, Rainer Wanke, Simone Bifani, E. C. Swallow, Konrad Kleinknecht, D. Coward, M. Valdata-Nappi, G. Marel, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and NA48/2
Subjects: Particle physics, Meson, Physics and Astronomy (miscellaneous), DIRECT PHOTON-EMISSION, RADIATIVE KAON DECAYS, DETECTOR, Hadron, interference, Elementary particle, CP violation, Kaon decay, NA48 2 collaboration, 01 natural sciences, charged K meson, High Energy Physics - Experiment, Particle decay, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Kaon decays, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), K meson decay, Physics, 010308 nuclear & particles physics, Branching fraction, 3. Good health, High Energy Physics::Experiment, Atomic physics, Dimensionless quantity
Abstract: We report on the measurement of the direct emission (DE) and interference (INT) terms of the K\pm -> \pi\pm\pi^0 g decay by the NA48/2 experiment at the CERN SPS. From the data collected during 2003 and 2004 about 600k such decay candidates have been selected. The relative amounts of DE and INT with respect to the internal bremsstrahlung (IB) contribution have been measured in the range 0, Comment: 17 pages, 8 figures
Published: 2010

33. Determination of the relative decay rate

Author: Jacqueline Batley, Nicolo Cartiglia, G. Ruggiero, B. Panzer-Steindel, M. C. Petrucci, M. Sozzi, U. Moosbrugger, Mark Slater, Fabrizio Petrucci, Evgueni Goudzovski, A. Gonidec, S. A. Wotton, G. Collazuol, Nadia Pastrone, A. A. Maier, M. Ziolkowski, Leander Litov, M. Savrie, E. Menichetti, P.L. Frabetti, M. Markytan, M. Lenti, M. Holder, M. Martini, H. D. Wahl, R. Sacco, P. Rubin, G.E. Kalmus, G. Bocquet, M. Scarpa, Yu. Potrebenikov, S. Giudici, M. De Beer, P. Lubrano, Anne Dabrowski, B. Peyaud, Stoyan Stoynev, Cristina Biino, Ivan Mikulec, M. Pepe, W. Kubischta, G.M. Pierazzini, Mitesh Patel, I. Mannelli, A. Peters, M. Valdata, E. Iacopini, A. Nappi, D. J. Munday, Alan W. Walker, P. Grafström, A. Hirstius, G. Graziani, M. Behler, E. Imbergamo, F. Marchetto, P. Cenci, F. Costantini, P. F. Dalpiaz, C. Lazzeroni, Peter Zahariev Hristov, L. Widhalm, Mayda Velasco, R. Fantechi, L. Masetti, V. Falaleev, W. Wislicki, Vladimir Kekelidze, U. Koch, Milene Calvetti, Mauro Piccini, A. Michetti, J.B. Cheze, Cvetan Valeriev Cheshkov, H. Dibon, Wander Baldini, Luca Fiorini, A. Ceccucci, C. Cerri, Andrea Bizzeti, A. Gianoli, G. Lamanna, N. A. Molokanova, K. Eppard, Manfred Jeitler, L. Gatignon, C. Morales Morales, Konrad Kleinknecht, G. Neuhofer, Rainer Wanke, D. T. Madigozhin, E. Mazzucato, A. Winhart, D.C. Cundy, G. Anzivino, E. C. Swallow, Roberta Arcidiacono, G. Gouge, P. Debu, T. Fonseca Martin, P. Marouelli, Marco Clemencic, N. Doble, M. Eppard, A.I. Zinchenko, E. Monnier, B. Vallage, M. Veltri, S. Goy Lopez, A. Norton, Roland Winston, F. Martelli, and G. Marel
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Kaon decays, Width ratio, Standard Model
Abstract: The decay rate of K S → π e ν relative to the rate of K L → π e ν has been measured by the NA48 Collaboration in a neutral kaon beam originating from 400 GeV proton-Be interactions at the CERN SPS. The result is 0.993 ± 0.026 stat ± 0.022 syst , compatible with 1 in agreement with the Standard Model prediction at tree level. It implies B R ( K S → π e ν ) = ( 7.05 ± 0.18 stat ± 0.16 syst ) × 10 −4 .
Published: 2007

34. First observation and branching fraction and decay parameter measurements of the weak radiative decay Xi0 -> Lambda e+ e

Author: Nadia Pastrone, A. Winhart, T. Fonseca Martin, M. Eppard, Mauro Piccini, Fabrizio Petrucci, G. Bocquet, Yu. Potrebenikov, M. Ziolkowski, Leander Litov, P.L. Frabetti, A. Peters, D.J. Munday, Rainer Wanke, Nicolo Cartiglia, Cristina Lazzeroni, Ivan Mikulec, P. Debu, E. Iacopini, M. Valdata, P. Grafström, Alan W. Walker, M.W. Slater, V. Falaleev, S. A. Wotton, P. F. Dalpiaz, M. Pepe, E. Imbergamo, E. C. Swallow, A. Dabrowski, M. Veltri, M. C. Petrucci, J. R. Batley, R. Fantechi, S. Goy Lopez, G. Ruggiero, N. Doble, J.B. Cheze, A. Norton, Roland Winston, M. Patel, Milene Calvetti, U. Moosbrugger, M. Martini, Evgueni Goudzovski, A. Maier, P. Hristov, G. Lamanna, M. Holder, Vladimir Kekelidze, A. Gonidec, N. A. Molokanova, K. Eppard, H. Dibon, Konrad Kleinknecht, A. Hirstius, A. Ceccucci, Andrea Bizzeti, Luca Fiorini, G. Collazuol, W. Kubischta, G. Marel, M. Markytan, M. Lenti, E. Menichetti, P. Marouelli, C. Cerri, S. Stoynev, U. Koch, C. Cheshkov, W. Baldini, F. Marchetto, L. Widhalm, M. Savrie, P. Cenci, H. D. Wahl, G.E. Kalmus, W. Wislicki, M. De Beer, B. Peyaud, Roberta Arcidiacono, M. Behler, A. Michetti, Marco Clemencic, M. Sozzi, F. Costantini, S. Giudici, Cristina Biino, P. Rubin, E. Monnier, C. Morales Morales, Mayda Velasco, D. T. Madigozhin, E. Mazzucato, A. I. Zinchenko, A. Gianoli, I. Mannelli, L. Masetti, B. Panzer-Steindel, P. Lubrano, A. Nappi, Manfred Jeitler, G.M. Pierazzini, G. Anzivino, G. Gouge, L. Gatignon, B. Vallage, R. Sacco, G. Neuhofer, D.C. Cundy, and M. Scarpa
Subjects: Nuclear and High Energy Physics, media_common.quotation_subject, Signal region, Radiative decay, Xi0 hyperon, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Asymmetry, iperoni, acceleratori di particelle, NO, High Energy Physics - Experiment, mesoni K, 0103 physical sciences, 010306 general physics, radiative decay, particelle elementari, media_common, Physics, decadimenti, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Bremsstrahlung, High Energy Physics::Experiment, Atomic physics, Particle Physics - Experiment, Conjugate
Abstract: The weak radiative decay Xi0 --> Lambda e+e- has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 +/- 5 events. We determine the branching fraction B(Xi0 --> Lambda e+e-) = [7.6 +/- 0.4(stat) +/- 0.4(syst) +/- 0.2(norm)] x 10^{-6}, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter alpha_{XiLambdaee} = -0.8 +/- 0.2, consistent with that of Xi0 --> Lambda gamma. The charge conjugate reaction Xi0_bar --> Lambda_bar e+e- has also been observed., Comment: 20 pages, 5 figures, 4 tables; revised: 19 pages, 4 figures, 4 tables, after reviewers' comments: 1 figure removed, 1 figure corrected, minor editorial changes; to be published in Phys. Lett. B
Published: 2007

35. Search for direct CP violation in the decays K-+/- -> 3 pi(+/-)

Author: Peter Zahariev Hristov, Nicolo Cartiglia, L. DiLella, Enrico Celeghini, L. Masetti, W. Kubischta, A. I. Zinchenko, A. Dabrowski, M. C. Petrucci, D. J. Munday, Simone Bifani, M. Martini, A. Gianoli, M. Fidecaro, M. Holder, E. Monnier, B. Vallage, F. Petrucci, B. Peyaud, M. Savrie, Evgueni Goudzovski, G. Kalmus, Maulik R. Patel, G. Bocquet, Yu. Potrebenikov, N. A. Molokanova, P. Marouelli, A. Peters, M. Calvetti, K. Eppard, L. Fiorini, Cristina Biino, Ivan Mikulec, F. Martelli, P. F. Dalpiaz, J.B. Cheze, M. Shieh, M. Wache, D. T. Madigozhin, I. Polenkevich, Michael Ziolkowski, V. Falaleev, Konrad Kleinknecht, D. Coward, M. Valdata-Nappi, Lau Gatignon, F. Costantini, M. Pepe, M. D. Wood, I. Mannelli, M. Markytan, S. Stoynev, E. Mazzucato, V. Kekelidze, S. Balev, P. Rubin, P. L. Frabetti, M. W. Slater, U. Moosbrugger, N. Doble, M. Sozzi, Augusto Ceccucci, E. Iacopini, G. Marel, G. Lamanna, Rainer Wanke, C. Morales Morales, Jacqueline Batley, Giuseppe Ruggiero, F. Marchetto, Cristina Lazzeroni, C. Damiani, A. Michetti, A. Winhart, T. Fonseca Martin, L. Widhalm, M. Scarpa, C. Cerri, H. Wahl, M. Veltri, Mauro Piccini, Andrea Bizzeti, R. Fantechi, P. Cenci, Mayda Velasco, Leander Litov, A. Gonidec, A. J. Culling, E. C. Swallow, G. Collazuol, B. Renk, A. Cotta Ramusino, H. Dibon, Wander Baldini, Alan W. Walker, E. Imbergamo, Mauro Raggi, G. Pierazzini, J. Derre, G. Neuhofer, Nicola Cabibbo, V. Kozhuharov, M. Lenti, S. Goy Lopez, D.C. Cundy, A. Maier, A. Norton, Roland Winston, Roberta Arcidiacono, S. Giudici, B. Bloch-Devaux, Marco Clemencic, S. A. Wotton, Massimiliano Fiorini, M. De Beer, E. Marinova, M. Szleper, C. Cheshkov, Manfred Jeitler, M. Behler, G. Anzivino, and A. Nappi
Subjects: Particle physics, Nuclear and High Energy Physics, media_common.quotation_subject, Dalitz plot, violazione CP, charged K meson, Asymmetry, NEUTRAL KAON, Nuclear physics, mesoni K, CHARGE ASYMMETRY, PARAMETER, NA48, CP-violation asymmetries, media_common, Physics, Large Hadron Collider, K meson, CP violation, Charge (physics), kaon decay
Abstract: We report a measurement of the direct CP violation asymmetry parameter A g in charged kaon decays K ± → π ± π + π − by the NA48/2 experiment at the CERN SPS. The experiment has been designed not to be limited by systematics in the asymmetry measurement. Using 1.67 × 10 9 such decays collected during the 2003 run, the charge asymmetry in the Dalitz plot linear slope parameter g has been measured to be A g = ( 1.7 ± 2.9 ) × 10 −4 . The precision of the result is limited by the statistics used.
Published: 2006

36. Helicity Analysis of Semileptonic Hyperon Decays Including Lepton Mass Effects

Author: J. G. Körner, A. Kadeer, and U. Moosbrugger
Subjects: Physics, Top quark, Particle physics, Physics and Astronomy (miscellaneous), Monte Carlo method, High Energy Physics::Phenomenology, Hyperon, FOS: Physical sciences, Helicity, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics::Experiment, Decay chain, Ground state, Engineering (miscellaneous), Lepton
Abstract: Using the helicity method we derive complete formulas for the joint angular decay distributions occurring in semileptonic hyperon decays including lepton mass and polarization effects. Compared to the traditional covariant calculation the helicity method allows one to organize the calculation of the angular decay distributions in a very compact and efficient way. In the helicity method the angular analysis is of cascade type, i.e. each decay in the decay chain is analyzed in the respective rest system of that particle. Such an approach is ideally suited as input for a Monte Carlo event generation program. As a specific example we take the decay $\Xi^0 \to \Sigma^+ + l^- + \bar{\nu}_l$ ($l^-=e^-, \mu^-$) followed by the nonleptonic decay $\Sigma^+ \to p + \pi^0$ for which we show a few examples of decay distributions which are generated from a Monte Carlo program based on the formulas presented in this paper. All the results of this paper are also applicable to the semileptonic and nonleptonic decays of ground state charm and bottom baryons, and to the decays of the top quark., Comment: Published version. 40 pages, 11 figures included in the text. Typos corrected, comments added, references added and updated
Published: 2005

37. Observation of the rare decay K-S -> pi(0)e(+)e(-)

Author: G. Neuhofer, A. Winhart, T. Fonseca Martin, F. Martelli, D.C. Cundy, M. De Beer, M. Veltri, M. Holder, S. Goy Lopez, E. Iacopini, P. Grafström, M. Behler, M. Valdata, G.M. Pierazzini, W. Wislicki, Roland Winston, C. Cerri, Leander Litov, J.B. Cheze, M. Lenti, Luca Fiorini, P. Debu, Nadia Pastrone, V. Kekelidze, P.L. Frabetti, M. Patel, P. Cenci, S. A. Wotton, D. Gurev, E. C. Swallow, W. Kubischta, U. Koch, B. Vallage, Milene Calvetti, Marco Clemencic, M.W. Slater, P. F. Dalpiaz, I. Mannelli, L. Gatignon, A. Nappi, P. Marouelli, A. Zinchenko, A. Ceccucci, A. Maier, B. Panzer-Steindel, D. Madigozhin, P. Hristov, Evgueni Goudzovski, R. Wanke, Alan W. Walker, J. R. Batley, Konrad Kleinknecht, C. Cheshkov, H. Dibon, Wander Baldini, M. Savrie, M. Sozzi, G. Marel, A. Peters, E. Menichetti, M. Scarpa, A. Norton, Manfred Jeitler, G.E. Kalmus, R. Sacco, Andrea Bizzeti, Yu. Potrebenikov, Giuseppe Ruggiero, M. Eppard, A. Dabrowski, M. C. Petrucci, U. Moosbrugger, F. Marchetto, Roberta Arcidiacono, G. Anzivino, V. Falaleev, A. Michetti, L. Masetti, E. Mazzucato, P. Lubrano, G. Gouge, D.J. Munday, Cristina Biino, Ivan Mikulec, F. Costantini, Michael Ziolkowski, S. Stoynev, P. Rubin, M. Markytan, A. Gianoli, G. Bocquet, H. D. Wahl, G. Graziani, N. A. Molokanova, F. Petrucci, B. Peyaud, K. Eppard, C. Morales Morales, Nicolo Cartiglia, M. Piccini, G. Lamanna, N. Doble, M. Martini, Mayda Velasco, S. Giudici, Cristina Lazzeroni, E. Imbergamo, A. Hirstius, A. Gonidec, G. Collazuol, R. Fantechi, L. Widhalm, E. Monnier, and M. Pepe
Subjects: mesoni K, decadimenti rari, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, K-L, Form factor (quantum field theory), Analytical chemistry, KAON DECAYS, 01 natural sciences, 3. Good health, High Energy Physics - Experiment, CP VIOLATION, SEARCH, 0103 physical sciences, Matrix element, Atomic physics, 010306 general physics
Abstract: A search for the decay Ks->pi0e+e- has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity Ks beam, 7 events were found with a background of 0.15 events. The branching fraction BR(Ks->pi0e+e-, m(ee) > 0.165 GeV/c^2) = (3.0^{+1.5}_{-1.2}(stat) +/-0.2 (syst)) x 10^{-9} has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(Ks->pi0e+e-) = (5.8^{+2.9}_{-2.4}) x 10^{-9}., Comment: 15 pages, 7 figures. Accepted for publication in Physics Letters B
Published: 2003

38. Precise tests of low energy QCD from $\mbox {$\mathrm {K}_{\mathrm {e}4}$}$ decay properties

Author: M. Holder, G. Bocquet, Yu. Potrebenikov, Lau Gatignon, B. Renk, R. Fantechi, Milene Calvetti, H. Dibon, Mauro Raggi, G. Lamanna, M. Wache, D. T. Madigozhin, Fabrizio Petrucci, Jacqueline Batley, P. Rubin, Anne Dabrowski, M. Pepe, P. Cenci, E. Iacopini, M. Scarpa, Stoyan Stoynev, Leander Litov, Peter Zahariev Hristov, P. Marouelli, E. Mazzucato, W. Kubischta, Marco Clemencic, A. Ceccucci, M. Szleper, Andrea Bizzeti, D. J. Munday, Rainer Wanke, E. Marinova, M. Sozzi, C. Morales Morales, S. A. Wotton, Vladimir Kekelidze, L. DiLella, G.M. Pierazzini, M. Markytan, M. Lenti, Cristina Lazzeroni, Simone Bifani, I. Polenkevich, C. Cerri, F. Marchetto, L. Widhalm, S. Balev, Cristina Biino, G. Kalmus, A. Peters, Nicola Cabibbo, C. Cheshkov, Ivan Mikulec, H. D. Wahl, M. Fidecaro, B. Peyaud, J. Derre, U. Moosbrugger, Evgueni Goudzovski, Konrad Kleinknecht, D. Coward, M. Valdata-Nappi, Alan W. Walker, N. A. Molokanova, K. Eppard, Mayda Velasco, J.B. Cheze, Luca Fiorini, M. D. Wood, M. Shieh, E. Monnier, G. Neuhofer, B. Vallage, D.C. Cundy, M. Martini, A. Cotta Ramusino, N. Doble, V. Kozhuharov, Massimiliano Fiorini, I. Mannelli, W. Baldini, L. Masetti, Roberta Arcidiacono, Nicolo Cartiglia, A. Winhart, T. Fonseca Martin, Mauro Piccini, G. Ruggiero, A. Gonidec, G. Collazuol, E. C. Swallow, Michael Ziolkowski, S. Venditti, M. Savrie, S. Giudici, A. A. Maier, E. Imbergamo, F. Costantini, B. Bloch-Devaux, A. I. Zinchenko, Maulik R. Patel, P. L. Frabetti, C. Damiani, A. Gianoli, M. Slater, M. De Beer, A. Michetti, Enrico Celeghini, V. Falaleev, M. C. Petrucci, A. Nappi, M. Veltri, P. F. Dalpiaz, S. Goy Lopez, M. Behler, Manfred Jeitler, A. Norton, Roland Winston, G. Anzivino, and G. Marel
Subjects: Phase difference, Physics, Quantum chromodynamics, Chiral symmetry, Particle physics, Chiral perturbation theory, Physics and Astronomy (miscellaneous), Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Lattice QCD, Low energy, High Energy Physics::Experiment, Engineering (miscellaneous), Energy (signal processing)
Abstract: We report results from the analysis of the $\mbox {$\mathrm {K}^{\pm}$}\rightarrow \pi^{+} \pi^{-} \mathrm{e}^{\pm} \nu$ ($\mbox {$\mathrm {K}_{\mathrm {e}4}$}$) decay by the NA48/2 collaboration at the CERN SPS, based on the total statistics of 1.13 million decays collected in 2003–2004. The hadronic form factors in the S- and P-wave and their variation with energy are obtained. The phase difference between the S- and P-wave states of the ππ system is accurately measured and allows a precise determination of $\mbox {$a_{0}^{0}$}$ and $\mbox {$a_{0}^{2}$}$, the I = 0 and I = 2 S-wave ππ scattering lengths: $\mbox {$a_{0}^{0}$}= 0.2220 \pm 0.0128 \mbox {$\mathrm {_{stat}}$}\pm 0.0050 \mbox {$\mathrm {_{syst}}$}\pm 0.0037\mbox {$\mathrm {_{th}}$},\mbox {$a_{0}^{2}$}= -0.0432 \pm 0.0086 \mbox {$\mathrm {_{stat}}$}\pm 0.0034 \mbox {$\mathrm {_{syst}}$}\pm 0.0028\mbox {$\mathrm {_{th}}$}$. Combination of this result with the other NA48/2 measurement obtained in the study of $\mbox {$\mbox {$\mathrm {K}^{\pm}$}\rightarrow \mbox {$\pi ^{0}$}\mbox {$\pi ^{0}$}\mbox {$\scriptstyle \pi ^{\pm }$}$}$ decays brings an improved determination of $\mbox {$a_{0}^{0}$}$ and the first precise experimental measurement of $\mbox {$a_{0}^{2}$}$, providing a stringent test of Chiral Perturbation Theory predictions and lattice QCD calculations. Using constraints based on analyticity and chiral symmetry, even more precise values are obtained: $\mbox {$a_{0}^{0}$}=0.2196 \pm 0.0028\mbox {$\mathrm {_{stat}}$}\pm 0.0020 \mbox {$\mathrm {_{syst}}$}$ and $\mbox {$a_{0}^{2}$}= -0.0444 \pm 0.0007 \mbox {$\mathrm {_{stat}}$}\pm 0.0005 \mbox {$\mathrm {_{syst}}$}\pm 0.0008 \mbox {$\mathrm {_{ChPT}}$}$.
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39. New high statistics measurement of Ke4 decay form factors and ππ scattering phase shifts

Author: P. L. Frabetti, P. Marouelli, A. Michetti, P. Rubin, E. Iacopini, G. Marel, W. Baldini, B. Renk, Andrea Bizzeti, M. Holder, F. Marchetto, R. Fantechi, Milene Calvetti, Simone Bifani, H. Dibon, S. Balev, M. Martini, Mauro Raggi, Michael Ziolkowski, L. Widhalm, U. Moosbrugger, S. Stoynev, E. Marinova, J.B. Cheze, M. Veltri, Luca Fiorini, E. Monnier, G. Neuhofer, A. Maier, A. Norton, Roland Winston, Maulik R. Patel, P. F. Dalpiaz, Massimiliano Fiorini, H. D. Wahl, C. Morales Morales, D.C. Cundy, M. Fidecaro, Rainer Wanke, M. Pepe, G. Kalmus, A. Peters, Manfred Jeitler, S. Goy Lopez, B. Peyaud, G.M. Pierazzini, G. Ruggiero, V. Falaleev, Konrad Kleinknecht, I. Mannelli, N. A. Molokanova, G. Anzivino, M. Szleper, A. Gonidec, Cristina Biino, Ivan Mikulec, M. Scarpa, K. Eppard, D. Coward, Augusto Ceccucci, C. Cheshkov, A. J. Culling, E. C. Swallow, G. Collazuol, M. Valdata-Nappi, A. Cotta Ramusino, W. Kubischta, Evgueni Goudzovski, S. Giudici, D. J. Munday, A. Nappi, E. Imbergamo, B. Vallage, Peter Zahariev Hristov, Mayda Velasco, M. Sozzi, G. Lamanna, Fabrizio Petrucci, Lucia Masetti, S. A. Wotton, Vladimir Kekelidze, M. Slater, L. DiLella, Leander Litov, Enrico Celeghini, M. Wache, D. T. Madigozhin, A. Dabrowski, M. C. Petrucci, E. Mazzucato, Alan W. Walker, M. Markytan, M. Lenti, A. I. Zinchenko, A. Gianoli, Nicola Cabibbo, V. Kozhuharov, M. Savrie, B. Bloch-Devaux, M. De Beer, M. Behler, N. Doble, C. Damiani, Jacqueline Batley, I. Polenkevich, C. Cerri, M. D. Wood, G. Bocquet, Yu. Potrebenikov, F. Martelli, Nicolo Cartiglia, Cristina Lazzeroni, F. Costantini, M. Shieh, A. Winhart, T. Fonseca Martin, Mauro Piccini, Marco Clemencic, Lau Gatignon, P. Cenci, J. Derre, Roberta Arcidiacono, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and NA48
Subjects: DIRECT CP-VIOLATION, Particle physics, Chiral perturbation theory, Meson, Physics and Astronomy (miscellaneous), BEAM, 01 natural sciences, Nuclear physics, Particle decay, Effective mass (solid-state physics), Pion, teoria perturbativa chirale, SEARCH, 0103 physical sciences, EQUATION, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], decadimenti mesoni K, scattering lengths, Engineering (miscellaneous), 010306 general physics, mesons, Elastic scattering, Physics, mesoni K, decadimento Ke4, fattori di forma, pion pion scattering, PHOTOS MONTE-CARLO, KE4 DECAYS, Kaon decay, pions, 010308 nuclear & particles physics, 13.20.Eb, 13.75.Lb, Form factor (quantum field theory), Isospin, NA48, Particle Physics - Experiment
Abstract: We report results from a new measurement of the $K_{e4}$ decay $K^{\pm} \rightarrow \pi^{+}\pi^{-}e^{\pm}\nu$ by the NA48/2 collaboration at the CERN SPS, based on a partial sample of more than 670000 $K_{e4}$ decays in both charged modes collected in 2003. The form factors of the hadronic current (F, G, H) and $\pi\pi$ phase difference ($\delta=\delta_{s}-\delta_{p}$) have been measured in ten independent bins of the $\pi\pi$ mass spectrum to investigate the variation. A sizeable acceptance at large $\pi\pi$ mass, a low background and a very good resolution contribute to an improved experimental accuracy, a factor two better than in the previous measurement, when extracting the $\pi\pi$ scattering lengths $a^{0}_{0}$ and $a^{2}_{0}$. Under the assumption of isospin symmetry and using numerical solutions of the Roy equations, the following values are obtained in the plane ($a^{0}_{0}, a^{2}_{0}): a^{0}_{0}=0.233 \pm 0.016_{stat} \pm 0.007_{syst}, a^{2}_{0}=-0.0471 \pm 0.011_{stat} \pm 0.004_{syst}$. The presence of potentially large isospin effects is also considered and will allow comparison with precise predictions from Chiral Perturbation Theory.
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40. Study of leptonic and semileptonic kaon decays at CERN

Author: Fantechi, R., Ambrosino, F., Antonelli, A., Anzivino, G., Arcidiacono, R., Baldini, W., Balev, S., Batley, J. R., Behler, M., Bifani, S., Biino, C., Bizzeti, A., Bloch-Devaux, B., Bocquet, G., Bolotov, V., Bucci, F., Cabibbo, N., Calvetti, M., Cartiglia, N., Ceccucci, A., Cenci, P., Cerri, C., Cheshkov, C., Chèze, J. B., Clemencic, M., Collazuol, G., Costantini, F., Cotta Ramusino, A., Coward, D., Cundy, D., Dabrowski, A., D Agostini, G., Dalpiaz, P., Damiani, C., Danielsson, H., Beer, M., Dellacasa, G., Derré, J., Dibon, H., Di Filippo, D., Dilella, L., Doble, N., Duk, V., Engelfried, J., Eppard, K., Falaleev, V., Fidecaro, M., Fiorini, L., Fiorini, M., Fonseca Martin, T., Frabetti, P. L., Fucci, A., Gallorini, S., Gatignon, L., Gersabeck, E., Gianoli, A., Giudici, S., Gonidec, A., Goudzovski, E., Goy Lopez, S., Gushchin, E., Hallgren, B., Hita-Hochgesand, M., Holder, M., Hristov, P., Iacopini, E., Imbergamo, E., Jeitler, M., Kalmus, G., Kekelidze, V., Kleinknecht, K., Kozhuharov, V., Kubischta, W., Kurshetsov, V., Lamanna, G., Lazzeroni, C., Lenti, M., Leonardi, E., Litov, L., Madigozhin, D., Maier, A., Mannelli, I., Marchetto, F., Marel, G., Markytan, M., Marouelli, P., Martini, M., Masetti, L., Massarotti, P., Mazzucato, E., Michetti, A., Mikulec, I., Misheva, M., Molokanova, N., Monnier, E., Moosbrugger, U., Morales Morales, C., Moulson, M., Movchan, S., Munday, D. J., Napolitano, M., Nappi, A., Neuhofer, G., Norton, A., Numao, T., Obraztsov, V., Palladino, V., Patel, M., Pepe, M., Peters, A., Petrucci, F., Petrucci, M. C., Peyaud, B., Piandani, R., Piccini, M., Pierazzini, G., Polenkevich, I., Popov, I., Potrebenikov, Yu, Raggi, M., Renk, B., Retière, F., Riedler, P., Romano, A., Rubin, P., Ruggiero, G., Salamon, A., Saracino, G., Savrié, M., Scarpa, M., Semenov, V., Sergi, A., Serra, M., Shieh, M., Sergey Shkarovskiy, Slater, M. W., Sozzi, M., Spadaro, T., Stoynev, S., Swallow, E., Szleper, M., Valdata-Nappi, M., Valente, P., Vallage, B., Velasco, M., Veltri, M., Venditti, S., Wache, M., Wahl, H., Walker, A., Wanke, R., Widhalm, L., Winhart, A., Winston, R., Wood, M. D., Wotton, S. A., Yushchenko, O., Zinchenko, A., Ziolkowski, M., R., Fantechi, Ambrosino, Fabio, A., Antonelli, G., Anzivino, R., Arcidiacono, W., Baldini, S., Balev, J., Batley, M., Behler, S., Bifani, C., Biino, A., Bizzeti, B., Bloch Devaux, G., Bocquet, V., Bolotov, F., Bucci, N., Cabibbo, M., Calvetti, N., Cartiglia, A., Ceccucci, P., Cenci, C., Cerri, C., Cheshkov, J., Ch??????ze, M., Clemencic, G., Collazuol, F., Costantini, A. C., Ramusino, D., Coward, D., Cundy, A., Dabrowski, G., D'Agostini, P., Dalpiaz, C., Damiani, H., Danielsson, M. D., Beer, G., Dellacasa, J., Derr??????, H., Dibon, DI FILIPPO, Domenico, L., Dilella, N., Doble, V., Duk, J., Engelfried, K., Eppard, V., Falaleev, M., Fidecaro, L., Fiorini, M., Fiorini, T. F., Martin, P., Frabetti, A., Fucci, S., Gallorini, L., Gatignon, E., Gersabeck, A., Gianoli, S., Giudici, A., Gonidec, E., Goudzovski, S. G., Lopez, E., Gushchin, B., Hallgren, M., Hita Hochgesand, M., Holder, P., Hristov, E., Iacopini, E., Imbergamo, M., Jeitler, G., Kalmu, V., Kekelidze, K., Kleinknecht, V., Kozhuharov, W., Kubischta, V., Kurshetsov, G., Lamanna, C., Lazzeroni, M., Lenti, E., Leonardi, L., Litov, D., Madigozhin, A., Maier, I., Mannelli, F., Marchetto, G., Marel, M., Markytan, P., Marouelli, M., Martini, L., Masetti, Massarotti, Paolo, E., Mazzucato, A., Michetti, I., Mikulec, M., Misheva, N., Molokanova, E., Monnier, U., Moosbrugger, C. M., Morale, M., Moulson, S., Movchan, D., Munday, M., Napolitano, A., Nappi, G., Neuhofer, A., Norton, T., Numao, V., Obraztsov, V., Palladino, M., Patel, M., Pepe, A., Peter, F., Petrucci, M., Petrucci, B., Peyaud, R., Piandani, M., Piccini, G., Pierazzini, I., Polenkevich, I., Popov, Y., Potrebenikov, M., Raggi, B., Renk, F., Reti??????re, P., Riedler, A., Romano, P., Rubin, G., Ruggiero, A., Salamon, Saracino, Giulio, M., Savri??????, M., Scarpa, V., Semenov, A., Sergi, M., Serra, M., Shieh, S., Shkarovskiy, M., Slater, M., Sozzi, T., Spadaro, S., Stoynev, E., Swallow, M., Szleper, M., Valdata Nappi, P., Valente, B., Vallage, M., Velasco, M., Veltri, S., Venditti, M., Wache, H., Wahl, A., Walker, R., Wanke, L., Widhalm, A., Winhart, R., Winston, M., Wood, S., Wotton, O., Yushchenko, A., Zinchenko, and M., Ziolkowski
Subjects: leptonic decays, Multidisciplinary, CP violation, semileptonic decays, kaon decay, CP violations, data sample, form factors

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