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1. 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

2. 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

3. 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

4. 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

5. 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

6. Search for the decay KS → π0γγ

Author: R.S. Dosanjh, M. Wittgen, J. Cogan, M. De Beer, T.J. Gershon, H. D. Wahl, G. Govi, W. Kubischta, E. Rondio, T. Cuhadar-Dönszelmann, Peter Zahariev Hristov, Anton Taurok, K. Holtz, Rainer Wanke, B. Peyaud, C. Cheshkov, N. A. Molokanova, M. Markytan, M. Lenti, D. J. Munday, Vladimir Kekelidze, G. Graziani, G. Neuhofer, A. Nappi, Lau Gatignon, A. Tkatchev, Nadia Pastrone, J.-C. Chollet, P. F. Dalpiaz, B. Panzer-Steindel, P. Cenci, E. Iacopini, P. Grafström, R. Turlay, I.G. Knowles, Konrad Kleinknecht, V. Falaleev, S. Giudici, I. Mannelli, D.C. Cundy, M. Contalbrigo, M. Pepe, S. Wronka, Y. Schué, B. Vallage, Benedetto Gorini, D. Marras, R. Fantechi, A. Maier, M. Eppard, G. Fischer, Milene Calvetti, L. Köpke, D. Madigojine, U. Koch, Manfred Jeitler, C. Cerri, R. Carosi, A. Lai, Andrea Formica, A. Winhart, A. Peters, Nicolo Cartiglia, A. Kalter, S. A. Wotton, Michael Andrew Parker, P.L. Frabetti, Louis Fayard, Mauro Piccini, F. Marchetto, A. Norton, J. Duclos, H. Dibon, Michal Szleper, Niels Doble, E. Olaiya, I. Pellmann, G. Unal, H. Fox, G. Anzivino, P. Debu, L. Widhalm, F. Costantini, E. Mazzucato, Roberta Arcidiacono, M. Sozzi, R. Sacco, B. Renk, A. Lacourt, Augusto Ceccucci, G. Pierazzini, J. Nassalski, T. O. White, W. Wislicki, V. Schönharting, M. Pernicka, Alan W. Walker, P. Lopes da Silva, L. Masetti, Sandro Palestini, A. Gonidec, A. I. Zinchenko, Lydia Iconomidou-Fayard, M. Holder, P. Marouelli, M. Cirilli, G. Collazuol, F. Petrucci, A. Gianoli, M. Savrie, C. Lazzeroni, R. Granier de Cassagnac, Roberto Guida, R. Casali, G. Tatishvili, G. Bocquet, Yu. Potrebenikov, G. Kalmus, R. J. Batley, H.G. Becker, Cristina Biino, Ivan Mikulec, J.B. Cheze, P. Lubrano, S.A. Schmidt, Victoria Jane Martin, E. Imbergamo, Mayda Velasco, H. Taureg, Andrea Bizzeti, Michael Ziolkowski, G.D. Barr, M. Martini, J. Ocariz, I. Wingerter, Alexi Mestvirishvili, Adrian John Bevan, and E. Menichetti
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Detector, Limit (mathematics), 010306 general physics, 01 natural sciences, Beam (structure)
Abstract: A search for the decay K S → π 0 γγ has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity K S beam, an upper limit for the branching ratio BR ( K S → π 0 γγ , z ⩾0.2) −7 has been obtained at 90% confidence level, where z = m γγ 2 / m K 0 2 .
Published: 2016

7. Precise measurement of the decay KL → π0γγ

Author: A. Lai, D. Marras, A. Bevan, R.S. Dosanjh, T.J. Gershon, B. Hay, G.E. Kalmus, C. Lazzeroni, D.J. Munday, M.D. Needham, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, M. Lenti, S. Luitz, I. Mikulec, A. Norton, S. Palestini, B. Panzer-Steindel, G. Tatishvili, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, P. Hristov, V. Kekelidze, D. Madigojine, N. Molokanova, Yu. Potrebenikov, A. Zinchenko, I. Knowles, V. Martin, R. Sacco, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Veltri, H.G. Becker, M. Eppard, H. Fox, K. Holtz, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Maruelli, I. Pellmann, A. Peters, B. Renk, S.A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J.C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Carosi, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, J.B. Cheze, J. Cogan, M. De Beer, P. Debu, A. Formica, R. Granier de Cassagnac, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, M. Clemencic, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, G. Fischer, M. Jeitler, M. Markytan, G. Neuhofer, M. Pernicka, A. Taurok, and L. Widhalm
Subjects: mesoni K, decadimenti rari, Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Gamma gamma, Pi, High Energy Physics::Experiment, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract: The decay rate of $\klpgg$ has been measured with the NA48 detector at the CERN SPS. A total of 2558 $\klpgg$ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be $(1.36 \pm0.03_{(stat)} \pm0.03_{(syst)}\pm 0.03_{(norm)})\times10^{-6}$ and the vector coupling constant $a_v = -0.46 \pm0.03_{(stat)} \pm0.04_{(syst)}$. This result suggests that the CP-violation effects are dominating in the $\klpee$ decay. An upper limit for the $\klpgg$ decay rate in the two photon mass region $m_{\gamma\gamma}
Published: 2016

8. Measurement of K-e3(0) form factors

Author: S.A. Schmidt, G. Bocquet, Yu. Potrebenikov, I. Mannelli, D. Marras, E. Imbergamo, G.M. Pierazzini, Rainer Wanke, P. Debu, Michael Andrew Parker, M. Sozzi, H. Taureg, M. Ziolkowski, V. Schönharting, M. Pepe, P. Lubrano, Nadia Pastrone, G. D'Agostini, S. A. Wotton, M. Cirilli, A. Nappi, J. C. Chollet, B. Panzer-Steindel, J. Ocariz, B. Renk, P. Lopes da Silva, L. Gatignon, M. Martini, P. F. Dalpiaz, H.G. Becker, I.G. Knowles, Fabrizio Petrucci, G. Neuhofer, N. Doble, T.J. Gershon, I. Wingerter-Seez, A. Ceccucci, Ivan Mikulec, M. Pernicka, S. Giudici, Michal Szleper, S. Wronka, Andrea Bizzeti, D.C. Cundy, F. Martelli, A. Peters, Louis Fayard, Lydia Iconomidou-Fayard, P. Marouelli, F. Marchetto, Y. Schué, G. Graziani, Adrian John Bevan, H. Fox, M. Wittgen, G.D. Barr, J. Cogan, T.O. White, E. Iacopini, G. Unal, L. Widhalm, Benedetto Gorini, M. Eppard, V. Falaleev, L. Bertanza, A. Lacourt, S. Stoynev, Manfred Jeitler, Leander Litov, P. Grafström, Cristina Biino, M. Savrie, Alexi Mestvirishvili, I. Pellmann, R. Sacco, J. Duclos, G. Anzivino, Wojciech Wislicki, J.B. Cheze, Vladimir Kekelidze, G.E. Kalmus, A. Gonidec, Rodolfo Carosi, H. D. Wahl, R. Fantechi, P.L. Frabetti, G. Govi, C. Cerri, G. Collazuol, B. Peyaud, Milene Calvetti, R. Turlay, B. Hay, B. Vallage, W. Kubischta, Cristina Lazzeroni, M. Veltri, U. Koch, A. Winhart, G. Fischer, M. Markytan, M. Lenti, H. Dibon, Anton Taurok, Mauro Piccini, A. Norton, E. Menichetti, M. De Beer, Konrad Kleinknecht, Alan W. Walker, N. A. Molokanova, K. Eppard, D.J. Munday, J. Nassalski, Nicolo Cartiglia, Sandro Palestini, E. Olaiya, E. Mazzucato, A. I. Zinchenko, A. Gianoli, R. Granier de Cassagnac, Victoria Jane Martin, Mayda Velasco, E. Rondio, T. Cuhadar-Dönszelmann, R.S. Dosanjh, D. Madigojine, A. Lai, Andrea Formica, C. Cheshkov, P. Cenci, A. Kalter, Roberta Arcidiacono, R. Casali, M. Contalbrigo, F. Costantini, A. Maier, P. Hristov, L. Köpke, and M. Holder
Subjects: Physics, Semileptonic decay, Nuclear and High Energy Physics, Meson, Scalar (mathematics), Hadron, SEMI-LEPTONIC DECAYS, RADIATIVE-CORRECTIONS, TENSOR INTERACTIONS, MONTE-CARLO, KAONS, Form factor (quantum field theory), Zero (complex analysis), Dalitz plot, Weak interaction, NO, Atomic physics, Particle Physics - Experiment
Abstract: The semi-leptonic decay of the neutral K meson $K^{0}_{L} \to \pi^{\pm}e^{\mp}\nu (K_{e3})$, was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector $(f_{+}(q^{2}))$, scalar $(f_{S})$ and tensor $(f_{T})$ interactions were measured. The linear slope of the vector form factor $\lambda_{+} = 0.0284 \pm 0.0007 \pm 0.0013$ and values for the ratios $|f_{S}/f_{+}(0)|=0.015^{+0.007}_{-0.010} \pm 0.012$ and $|f_{T}/f_{+}(0)|=0.05^{+0.03}_{-0.04} \pm 0.03$ were obtained. The values for $f_{S}$ and for $f_{T}$ are consistent with zero. Assuming only vector-axial vector couplings, $\lambda_{+} = 0.02888 \pm 0.0004 \pm 0.0011$ and a good fit consistent with pure V-A couplings were obtained. Alternatively a fit to a dipole form factor yields a pole mass of $M = 859 \pm 18$ MeV, consistent with the $K^{*}(892)$ mass. The semileptonic decay of the neutral K meson, KL0→π±e∓ν ( Ke3 ), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f+(q2)) , scalar ( fS ) and tensor ( fT ) interactions were measured. The linear slope of the vector form factor λ+=0.0284±0.0007±0.0013 and values for the ratios |fS/f+(0)|=0.015−0.010+0.007±0.012 and |fT/f+(0)|=0.05−0.04+0.03±0.03 were obtained. The values for fS and fT are consistent with zero. Assuming only vector–axial-vector couplings, λ+=0.0288±0.0004±0.0011 and a good fit consistent with pure V–A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M=859±18 MeV , consistent with the K*(892) mass. The semileptonic decay of the neutral K meson, KL -> pi e nu (Ke3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f_+(q^2)), scalar (f_S) and tensor (f_T) interactions were measured. The linear slope of the vector form factor lambda_+ = 0.0284+-0.0007+-0.0013 and values for the ratios |f_S/f_+(0)| = 0.015^{+0.007}_{-0.010}+-0.012 and |f_T/f_+(0)| = 0.05^{+0.03}_{-0.04}+-0.03 were obtained. The values for f_S and f_T are consistent with zero. Assuming only Vector-Axial vector couplings, lambda_+ = 0.0288+-0.0004+-0.0011 and a good fit consistent with pure V-A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M = 859+-18 MeV, consistent with the K^*(892) mass.
Published: 2016

9. First measurement of the rate K0L → πμνγ

Author: C Siman, J.P. Matheys, R. Wilhelm, G.D. Barr, Julien Cogan, B. Panzer-Steindel, Sandro Palestini, R. Turlay, Michael Ziolkowski, J.B. Cheze, P. Lubrano, V. Fanti, U. Koch, W. Kubischta, A. Michetti, M. Calvetti, C. Cerri, D. J. Munday, J. Scheidt, R. Fantechi, P. F. Dalpiaz, B. Vallage, M. Bender, J. C. Chollet, Cinzia Talamonti, Augusto Ceccucci, P.L. Frabetti, P Maas, S. Schanne, Paolo Calafiura, H.G. Becker, S. Giudici, H. Dibon, O. Boyle, A. Gianoli, R. Casali, P. Hristov, T. O. White, H. Parsons, R. Carosi, A. Lai, M. Martini, Alan W. Walker, Andrea Formica, S. Crépé, M. Pepe, Cristina Biino, Ivan Mikulec, L. Bertolotto, F Rossi, B. Peyaud, Benedetto Gorini, D. Schinzel, L. Köpke, H. Blümer, G. Pierazzini, P. Buchholz, M. Savrie, M. Sozzi, E. Menichetti, I Schwarze, Lau Gatignon, Mayda Velasco, G. Tatichvili, H. Taureg, Manfred Jeitler, M.G Setzu, M. De Beer, G Fischer, A. Tkatchev, G Oakland, D. Coward, F. Costantini, T Beier, Louis Fayard, F. Marchetto, Niels Doble, I Kojevnikov, A. Norton, Konrad Kleinknecht, P. Cenci, L. Musa, J. Duclos, Fabrizio Petrucci, G. Anzivino, Aniello Nappi, J. Schmidt, A. Kalter, P. Grafström, G. Unal, I. Potrebenikov, Vladimir Kekelidze, G. Govi, J. Bremer, Anton Taurok, Andrea Bizzeti, P. Debu, Lydia Iconomidou-Fayard, E. Mazzucato, M. Porcu, Roberta Arcidiacono, I. Augustin, V. Marzulli, S.F Takach, A. Gonidec, M. Holder, M. Pernicka, C. Ebersberger, R.W. Moore, Ken Peach, B Hay, M. Markytan, M. Lenti, O. Zeitnitz, F. Leber, O. Steinkamp, G. Kesseler, N.E Mc Kay, G. Neuhofer, Wolfgang Funk, D.C. Cundy, J. Ocariz, B. Renk, O. Vossnack, I. Mannelli, S. Luitz, G. Bocquet, Michael Andrew Parker, and V. Schönharting
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Large Hadron Collider, Branching fraction, Photon detector, NA48 experiment, Calorimeter
Abstract: In a preliminary version of the NA48 experiment at the CERN SPS, in which an iron-scintillator sandwich calorimeter was used as a photon detector, the ratio of K L → πμνγ and K L → πμν decays was measured. The branching ratio BR(K L →πμνγ, E γ ∗ ≥30 MeV )/(K L → πμν ) is found to be (2.08±0.17 +0.16 −0.21 )×10 −3 , where the first error is statistical and the second systematic. The result is in agreement with theoretical predictions.
Published: 2016

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. Measurement of Kμ30 form factors

Author: M. Sozzi, P. Debu, M. Cirilli, G. Fischer, S. A. Wotton, Konrad Kleinknecht, H. D. Wahl, E. Iacopini, H.G. Becker, P. Grafström, P. Lubrano, B. Peyaud, Anton Taurok, M. Eppard, A. Winhart, Nadia Pastrone, Benedetto Gorini, Cristina Biino, Ivan Mikulec, J. C. Chollet, V. Kekelidze, S.A. Schmidt, I.G. Knowles, B. Vallage, Milene Calvetti, Manfred Jeitler, I. Wingerter-Seez, H. Taureg, S. Wronka, H. Fox, R. Turlay, M. Wittgen, A. Lacourt, J. Cogan, A. Kalter, A. Gonidec, M. Markytan, H. Dibon, T.O. White, G. Unal, G. Collazuol, J. Duclos, G. Anzivino, A. Peters, Adrian John Bevan, E. Rondio, J. Ocariz, G. Graziani, G.D. Barr, C. Cheshkov, R. Fantechi, I. Mannelli, L. Gatignon, T.J. Gershon, Roberta Arcidiacono, Andrea Bizzeti, M. Lenti, B. Renk, G. Bocquet, Wojciech Wislicki, B. Panzer-Steindel, D. Madigozhin, R. Casali, M. De Beer, J.B. Cheze, U. Koch, A. Nappi, V. Falaleev, M. Piccini, Michael Ziolkowski, M. Contalbrigo, A. Zinchenko, Alexi Mestvirishvili, Louis Fayard, T. Cuhadar-Dönszelmann, R. Wanke, R.S. Dosanjh, R. Bernhard, N. Doble, L. Widhalm, Cristina Lazzeroni, A. Ceccucci, S. Stoynev, M. Martini, B. Hay, A. Maier, P. Hristov, A. Lai, I. Pellmann, S. Giudici, Andrea Formica, Giuseppe Ruggiero, D.J. Munday, Michal Szleper, A. Norton, J. Nassalski, L. Köpke, C. Cerri, E. Imbergamo, M. Pernicka, M. Savrie, E. Menichetti, F. Costantini, M. Pepe, G.E. Kalmus, G. D'Agostini, G. Govi, Nicolo Cartiglia, P. Cenci, Michael Andrew Parker, W. Kubischta, P. F. Dalpiaz, V. Schönharting, M. Holder, M. Veltri, G.M. Pierazzini, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, L. Bertanza, G. Neuhofer, R. Carosi, D.C. Cundy, Y. Schué, R. Sacco, A. Gianoli, R. Granier de Cassagnac, E. Olaiya, Yu. Potrebenikov, E. Mazzucato, F. Petrucci, Victoria Jane Martin, Mayda Velasco, Sandro Palestini, F. Marchetto, N. A. Molokanova, K. Eppard, Leander Litov, P.L. Frabetti, Alan W. Walker, and D. Marras
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Form factor (quantum field theory), Dalitz plot, NA48 experiment, 010306 general physics, 01 natural sciences
Abstract: This Letter reports on a new high precision measurement of the form factors of the K L → π ± μ ∓ ν μ decay. The data sample of about 2.3 × 10 6 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, λ + ′ = ( 20.5 ± 2.2 stat ± 2.4 syst ) × 10 −3 , and a quadratic, λ + ″ = ( 2.6 ± 0.9 stat ± 1.0 syst ) × 10 −3 term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ 0 = ( 9.5 ± 1.1 stat ± 0.8 syst ) × 10 −3 . Using a linear fit our results were: λ + = ( 26.7 ± 0.6 stat ± 0.8 syst ) × 10 −3 and λ 0 = ( 11.7 ± 0.7 stat ± 1.0 syst ) × 10 −3 . A pole fit of the form factors yields: m V = ( 905 ± 9 stat ± 17 syst ) MeV / c 2 and m S = ( 1400 ± 46 stat ± 53 syst ) MeV / c 2 .
Published: 2007

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

Author: P. Debu, T. Cuhadar-Dönszelmann, Sandro Palestini, R.S. Dosanjh, S. A. Wotton, M. Wittgen, Benedetto Gorini, J. Cogan, Rainer Wanke, Manfred Jeitler, P. F. Dalpiaz, H. D. Wahl, T.J. Gershon, A. Gaponenko, J. Duclos, M. Veltri, G. Anzivino, B. Peyaud, Michal Szleper, G.D. Barr, G. Fischer, Anton Taurok, Nadia Pastrone, Vladimir Kekelidze, A. Norton, G.M. Pierazzini, C. Cheshkov, B. Vallage, R. Fantechi, Fabrizio Petrucci, M. Savrie, A. I. Zinchenko, A. Kalter, Konrad Kleinknecht, Nicolo Cartiglia, Michael Andrew Parker, J. C. Chollet, Leander Litov, P.L. Frabetti, E. Menichetti, G.E. Kalmus, A. Peters, V. Schönharting, Milene Calvetti, A. Nappi, J. Ocariz, H. Taureg, I.G. Knowles, H.G. Becker, A. Gianoli, B. Renk, R. Granier de Cassagnac, R. Turlay, M. Pepe, Cristina Biino, Ivan Mikulec, Roberto Guida, Alan W. Walker, D.J. Munday, J. Nassalski, G. D'Agostini, F. Martelli, Augusto Ceccucci, Roberta Arcidiacono, S. Giudici, G. Govi, M. De Beer, P. Lopes da Silva, M. Pernicka, H. Dibon, B. Hay, Andrea Bizzeti, S. Wronka, W. Kubischta, N. A. Molokanova, Lydia Iconomidou-Fayard, P. Marouelli, Louis Fayard, F. Marchetto, G. Graziani, Michael Ziolkowski, K. Eppard, M. Holder, Victoria Jane Martin, U. Koch, D. Marras, A. Winhart, L. Widhalm, I. Mannelli, Mayda Velasco, Alexi Mestvirishvili, M. Eppard, Mauro Piccini, Wojciech Wislicki, P. Lubrano, V. Falaleev, M. Sozzi, S. Stoynev, G. Tatishvili, L. Bertanza, E. Rondio, E. Olaiya, A. Gonidec, D. T. Madigozhin, Lau Gatignon, S.A. Schmidt, M. Cirilli, Cristina Lazzeroni, Niels Doble, G. Collazuol, C. Cerri, A. Tkatchev, I. Pellmann, E. Mazzucato, T.O. White, G. Unal, M. Martini, R. Sacco, M. Markytan, M. Lenti, G. Bocquet, Yu. Potrebenikov, E. Iacopini, P. Cenci, E. Imbergamo, G. Neuhofer, M. Contalbrigo, P. Grafström, I. Wingerter-Seez, A. Maier, P. Hristov, R. Carosi, D.C. Cundy, L. Köpke, A. Lai, Andrea Formica, Adrian John Bevan, Y. Schué, F. Costantini, J.B. Cheze, B. Panzer-Steindel, H. Fox, and A. Lacourt
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Photon emission, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Extraction (chemistry), Analytical chemistry, NA48 experiment, CP violation, 010306 general physics, 01 natural sciences
Abstract: We present a measurement of the ratio of the decay rates Γ ( K L → π + π − ) / Γ ( K L → π ± e ∓ ν ) , denoted as Γ K 2 π / Γ K e 3 . The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K 2 π and five million K e 3 decays, we find Γ K 2 π / Γ K e 3 = ( 4.835 ± 0.022 stat . ± 0.016 syst . ) × 10 −3 . From this we derive the branching ratio of the CP violating decay K L → π + π − and the CP violation parameter | η + − | . Excluding the CP conserving direct photon emission component K L → π + π − γ , we obtain the results BR ( K L → π + π − ) = ( 1.941 ± 0.019 ) × 10 −3 and | η + − | = ( 2.223 ± 0.012 ) × 10 −3 .
Published: 2007

20. 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

21. 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

22. 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

23. Measurement of the KL→e+e−e+e− decay rate

Author: M. Wittgen, Rainer Wanke, J. Cogan, T. Çuhadar, J. C. Chollet, U. Koch, M. Markytan, M. Lenti, I.G. Knowles, A. Winhart, G. Tatishvili, Mauro Piccini, S. Giudici, R. Fantechi, S. Wronka, I. Wingerter-Seez, Milene Calvetti, Nicolo Cartiglia, R.S. Dosanjh, Michael Andrew Parker, G.M. Pierazzini, G. Govi, N. A. Molokanova, A. Kalter, M. Eppard, H. D. Wahl, P. Lubrano, Adrian John Bevan, T.O. White, W. Kubischta, B. Hay, G. Unal, Vladimir Kekelidze, K. Eppard, H. Dibon, I. Mannelli, S.A. Schmidt, E. Rondio, B. Peyaud, V. Schönharting, Roberta Arcidiacono, E. Imbergamo, G. Graziani, P. F. Dalpiaz, Fabrizio Petrucci, Nadia Pastrone, R. Casali, H. Taureg, R. Turlay, D. Marras, Augusto Ceccucci, P.L. Frabetti, B. Vallage, M. Contalbrigo, I. Melzer-Pellmann, Alexi Mestvirishvili, J. Ocariz, T.J. Gershon, M. Sozzi, Benedetto Gorini, C. Cheshkov, A. I. Zinchenko, Louis Fayard, J.B. Cheze, F. Marchetto, B. Renk, V. Falaleev, Manfred Jeitler, H.G. Becker, Alan W. Walker, A. Gianoli, Sandro Palestini, E. Iacopini, A. Maier, P. Hristov, J. Duclos, G. Anzivino, M. Cirilli, Niels Doble, Andrea Bizzeti, Cristina Biino, Ivan Mikulec, A. Peters, Konrad Kleinknecht, Luca Fiorini, R. Granier de Cassagnac, G. Neuhofer, P. Grafström, G. Bocquet, Yu. Potrebenikov, Michael Ziolkowski, G.D. Barr, D.C. Cundy, G. Lamanna, D. Madigojine, M. Holder, C. Cerri, L. Widhalm, M. Pernicka, L. Köpke, Victoria Jane Martin, Y. Schué, A. Lai, Andrea Formica, Mayda Velasco, P. Debu, E. Olaiya, Lau Gatignon, F. Costantini, G. Ruggiero, A. Nappi, E. Mazzucato, S. A. Wotton, R. Sacco, Michal Szleper, Wojciech Wislicki, A. Gonidec, Cristina Lazzeroni, M. Savrie, P. Cenci, G. Collazuol, G. Fischer, E. Menichetti, Anton Taurok, G.E. Kalmus, M. De Beer, M. Martini, M. Pepe, G. D'Agostini, M.D. Needham, A. Norton, D.J. Munday, J. Nassalski, H. Fox, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, A. Lacourt, and B. Panzer-Steindel
Subjects: Physics, Nuclear and High Energy Physics, Meson, Branching fraction, Analytical chemistry, Atomic physics, Positron annihilation
Abstract: The decay rate of the long-lived neutral K meson into the e + e − e + e − final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br ( K L → e + e − e + e − ) = ( 3.30 ± 0.24 stat ± 0.23 syst ± 0.10 norm ) × 10 −8 .
Published: 2005

24. Search for CP violation in K0→3π0 decays

Author: Konrad Kleinknecht, M. Holder, G. Graziani, W. Wislicki, A. Gonidec, M. Wittgen, E. Rondio, Andrea Bizzeti, J. C. Chollet, G. Collazuol, J. Nassalski, P. F. Dalpiaz, V. Falaleev, D. Madigojine, P. Lopes da Silva, Nadia Pastrone, R. Fantechi, I. Pellmann, Benedetto Gorini, G. Bocquet, Yu. Potrebenikov, T.J. Gershon, S. Giudici, T. Cuhadar-Dönszelmann, Milene Calvetti, Augusto Ceccucci, Vladimir Kekelidze, Manfred Jeitler, F. Martelli, A. Lai, Andrea Formica, R.S. Dosanjh, F. Derue, M. Martini, G.D. Barr, B. Vallage, G. Neuhofer, M. Markytan, J. Duclos, G. Anzivino, H. D. Wahl, Lydia Iconomidou-Fayard, M. Lenti, N. A. Molokanova, K. Eppard, P. Marouelli, C. Cerri, D.C. Cundy, G. Gouge, R. Turlay, H. Dibon, G. Marel, B. Peyaud, F. Costantini, Rainer Wanke, U. Koch, A. Peters, Y. Schué, M. Pepe, P. Debu, A. Winhart, C. Cheshkov, Fabrizio Petrucci, Mauro Piccini, G.M. Pierazzini, T.O. White, G. Unal, S. A. Wotton, P. Lubrano, W. Kubischta, B. Panzer-Steindel, P. Rubin, S.A. Schmidt, S. Wronka, Alexi Mestvirishvili, P.L. Frabetti, Nicolo Cartiglia, Michael Ziolkowski, E. Imbergamo, J.B. Cheze, Michael Andrew Parker, Luca Fiorini, Louis Fayard, F. Marchetto, D. Marras, L. Widhalm, E. Iacopini, Alan W. Walker, V. Schönharting, Cristina Biino, Ivan Mikulec, I. Wingerter-Seez, P. Grafström, M. Sozzi, G. Tatishvili, A. Nappi, M. Eppard, J. R. Batley, Massimiliano Fiorini, M. Cirilli, Niels Doble, Michal Szleper, R. Sacco, A. Lacourt, M. Savrie, E. Menichetti, G.E. Kalmus, M. De Beer, Roberta Arcidiacono, R. Casali, M. Veltri, Lau Gatignon, A. Norton, P. Cenci, M. Contalbrigo, A. Maier, P. Hristov, L. Köpke, D.J. Munday, Victoria Jane Martin, E. Olaiya, Cristina Lazzeroni, E. Mazzucato, A. I. Zinchenko, M. Pernicka, A. Gianoli, R. Granier de Cassagnac, A. Hirstius, Anton Taurok, I. Mestvirishvili, and I. Mannelli
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Pi, CP violation, 010306 general physics, Lifetime distribution, 01 natural sciences
Abstract: Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K S → 3 π 0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K 0 / K ¯ 0 → 3 π 0 decays, the CP violating amplitude η 000 = A ( K S → 3 π 0 ) / A ( K L → 3 π 0 ) has been found to be Re ( η 000 ) = − 0.002 ± 0.011 ± 0.015 and Im ( η 000 ) = − 0.003 ± 0.013 ± 0.017 . This corresponds to an upper limit on the branching fraction of Br ( K S → 3 π 0 ) 7.4 × 10 −7 at 90% confidence level. The result is used to improve knowledge of Re ( e ) and the CPT violating quantity Im ( δ ) via the Bell–Steinberger relation.
Published: 2005

25. Measurement of the branching ratio of the decay and extraction of the CKM parameter

Author: A. Lai, D. Marras, A. Bevan, R.S. Dosanjh, T.J. Gershon, B. Hay, G.E. Kalmus, C. Lazzeroni, D.J. Munday, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, A. Norton, S. Palestini, B. Panzer-Steindel, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, A. Gaponenko, P. Hristov, V. Kekelidze, L. Litov, D. Madigojine, N. Molokanova, Yu. Potrebenikov, S. Stoynev, G. Tatishvili, A. Tkatchev, A. Zinchenko, I. Knowles, V. Martin, R. Sacco, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Lenti, F. Martelli, M. Veltri, H.G. Becker, K. Eppard, M. Eppard, H. Fox, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Marouelli, I. Pellmann, A. Peters, B. Renk, S.A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J.C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, G. Lamanna, I. Mannelli, G. Pierazzini, M. Sozzi, J.B. Cheze, J. Cogan, M. De Beer, P. Debu, A. Formica, R. Granier de Cassagnac, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, R. Guida, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, G. Fischer, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, M. Pernicka, A. Taurok, and L. Widhalm
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Cabibbo–Kobayashi–Maskawa matrix, Branching fraction, Coupling parameter, Extraction (chemistry), Form factor (quantum field theory), Measure (mathematics)
Abstract: We present a new measurement of the branching ratio R of the decay K L → π ± e ∓ ν , denoted as K e 3 , relative to all charged K L decays with two tracks, based on data taken with the NA48 detector at the CERN SPS. We measure R = 0.4978 ± 0.0035 . From this we derive the K e 3 branching fraction and the weak coupling parameter | V u s | in the CKM matrix. We obtain | V u s | f + ( 0 ) = 0.2146 ± 0.0016 , where f + ( 0 ) is the vector form factor in the K e 3 decay.
Published: 2004

26. 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

27. Measurement of the Ξ0→Λγ decay asymmetry and branching fraction

Author: G. Tatishvili, Lau Gatignon, D. Marras, A. Tkatchev, M. Sozzi, Benedetto Gorini, P. Cenci, M. Cirilli, Niels Doble, G. Govi, M. De Beer, Manfred Jeitler, M. Holder, A. Kalter, Roberta Arcidiacono, R. Casali, W. Kubischta, M. Contalbrigo, E. Olaiya, J. Duclos, A. Winhart, P. Debu, A. Maier, G. Anzivino, P. Hristov, Mauro Piccini, L. Köpke, P. F. Dalpiaz, I. Wingerter-Seez, T.O. White, G. Unal, S. A. Wotton, Rainer Wanke, Nadia Pastrone, C. Cheshkov, E. Mazzucato, T.J. Gershon, Adrian John Bevan, A. Gaponenko, G.D. Barr, H. Fox, R. Turlay, B. Vallage, M. Markytan, M. Lenti, M. Pepe, G. D'Agostini, Nicolo Cartiglia, A. I. Zinchenko, A. Lacourt, Michael Andrew Parker, F. Martelli, E. Rondio, J. C. Chollet, M. Martini, I.G. Knowles, Alexi Mestvirishvili, Augusto Ceccucci, E. Iacopini, J.B. Cheze, A. Peters, D. Madigojine, S. Giudici, A. Gianoli, N. A. Molokanova, T. Cuhadar-Dönszelmann, K. Eppard, P. Grafström, A. Nappi, A. Gonidec, R. Granier de Cassagnac, Roberto Guida, G.M. Pierazzini, R.S. Dosanjh, G. Collazuol, Konrad Kleinknecht, H.G. Becker, Cristina Biino, Ivan Mikulec, S. Wronka, V. Schönharting, G. Graziani, R. Fantechi, M. Wittgen, Michal Szleper, B. Hay, J. Cogan, V. Falaleev, I. Pellmann, Milene Calvetti, M. Savrie, H. Dibon, P. Lubrano, B. Panzer-Steindel, S.A. Schmidt, E. Menichetti, G. Neuhofer, Sandro Palestini, G.E. Kalmus, Louis Fayard, R. Carosi, F. Marchetto, D.C. Cundy, Vladimir Kekelidze, L. Widhalm, A. Lai, Andrea Formica, Y. Schué, E. Imbergamo, F. Costantini, Victoria Jane Martin, M. Eppard, R. Sacco, G. Bocquet, Yu. Potrebenikov, U. Koch, Mayda Velasco, M. Veltri, A. Norton, G. Fischer, Anton Taurok, D.J. Munday, J. Nassalski, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, L. Bertanza, M. Pernicka, Wojciech Wislicki, J. Ocariz, B. Renk, Cristina Lazzeroni, H. D. Wahl, B. Peyaud, I. Mannelli, Michael Ziolkowski, H. Taureg, Andrea Bizzeti, C. Cerri, Fabrizio Petrucci, P.L. Frabetti, and Alan W. Walker
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Large Hadron Collider, Branching fraction, media_common.quotation_subject, iperoni Xi0, Hyperon, Radiative decay, NA48 experiment, Asymmetry, Nuclear physics, decadimenti radiativi, Radiative transfer, media_common
Abstract: In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Ξ0→Λγ have been found with an estimated background of 58±8 events. From these events the Ξ0→Λγ decay asymmetry has been determined to α(Ξ0→Λγ)=-0.78±0.18stat±0.06 syst, which is the first evidence of a decay asymmetry in Ξ 0→Λγ. The branching fraction of the decay has been measured to be Br(Ξ0→Λγ)=(1.16±0.05 stat±0.06syst)×10-3. © 2004 Elsevier B.V. All rights reserved.
Published: 2004
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28. Investigation of $K_\mathrm{L,S} \rightarrow \pi^+ \pi^{-} e^+ e^{-}$ decays

Author: Benedetto Gorini, J.P. Matheys, Manfred Jeitler, Victoria Jane Martin, M. De Beer, J. Duclos, G. Anzivino, Michael Ziolkowski, T. Cuhadar-Dönszelmann, G. Kalmus, H.G. Becker, Mayda Velasco, Cristina Biino, Ivan Mikulec, M. Wittgen, I. Augustin, Vladimir Kekelidze, G. Neuhofer, E. Iacopini, M. Pernicka, M. Veltri, M. Contalbrigo, A. Winhart, P. Grafström, M. Cirilli, O. Vossnack, Wolfgang Funk, Mauro Piccini, R. Carosi, T.J. Gershon, D.C. Cundy, A. Gaponenko, A. Hirstius, Paolo Calafiura, A. Norton, A. I. Zinchenko, S. Luitz, A. Lai, Nadia Pastrone, M. Sozzi, Augusto Ceccucci, A. Gianoli, K. Holtz, I. Mannelli, J.B. Cheze, R. Granier de Cassagnac, Michal Szleper, Roberto Guida, Y. Schué, R. Casali, R. Fantechi, B. Hay, L. Köpke, Frederic Derue, D. Coward, D. Marras, M. Savrie, Cristina Lazzeroni, G. Fischer, A. Peters, Milene Calvetti, H. D. Wahl, E. Menichetti, D. Schinzel, C. Cheshkov, G.D. Barr, G. Unal, Michael Bender, A. Kalter, M. Martini, J. Nassalski, U. Koch, A. Nappi, Anton Taurok, H. Bluemer, Louis Fayard, F. Marchetto, S. A. Wotton, R.S. Dosanjh, Roberta Arcidiacono, P. Lopes da Silva, H. Taureg, Lydia Iconomidou-Fayard, A L Tkachev, P. Marouelli, H. Dibon, L. Bertanza, R. Turlay, L. Widhalm, G. Tatishvili, M. Markytan, Niels Doble, Adrian John Bevan, M. Lenti, E. Rondio, A. Bigi, B. Peyaud, Lau Gatignon, G. Graziani, R. Sacco, J.-C. Chollet, Andrea Bizzeti, I. Wingerter-Seez, G. Pierazzini, V. Falaleev, P Z Khristov, I.G. Knowles, W. Wislicki, E. Mazzucato, G. Govi, P. Cenci, S. Giudici, W. Kubischta, S. Wronka, P. Lubrano, P. Debu, S.A. Schmidt, M. Scarpa, D. J. Munday, E. Imbergamo, Alexi Mestvirishvili, J. Ocariz, J. G. Cogan, F. Martelli, M. Holder, M. Pepe, G. D'Agostini, D. Madigojine, Konrad Kleinknecht, I. Pellmann, F. Costantini, G. Bocquet, Yu. Potrebenikov, A. Gonidec, G. Collazuol, A. Maier, Matthew Needham, M. Eppard, Nicolo Cartiglia, Michael Andrew Parker, Rainer Wanke, P. F. Dalpiaz, V. Schönharting, B. Vallage, Jacqueline Batley, C. Cerri, E. Olaiya, H. Fox, A. Lacourt, B. Panzer-Steindel, Fabrizio Petrucci, P.L. Frabetti, T. O. White, H. Parsons, Alan W. Walker, Sandro Palestini, A. Formica, and N. A. Molokanova
Subjects: Nuclear physics, Physics, Particle physics, Angular distribution, Large Hadron Collider, Physics and Astronomy (miscellaneous), Angular correlation, Charge radius, Pi, NA48 experiment, Engineering (miscellaneous)
Published: 2003

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

Author: C. Cheshkov, U. Koch, G. Govi, W. Kubischta, E. Iacopini, P. Grafström, G. Bocquet, Yu. Potrebenikov, Nadia Pastrone, A. Winhart, A. Lai, Mauro Piccini, B. Vallage, P. Debu, R. Fantechi, Andrea Formica, Lydia Iconomidou-Fayard, Milene Calvetti, J. C. Chollet, I. Mannelli, A. Nappi, M. Eppard, I.G. Knowles, Michal Szleper, M. Savrie, E. Menichetti, R.S. Dosanjh, F. Costantini, G.E. Kalmus, Sandro Palestini, M. De Beer, P. Lubrano, H. Dibon, S. Giudici, Giacomo Graziani, A. Peters, S. Wronka, M. Wittgen, M. Holder, Benedetto Gorini, S.A. Schmidt, D. Marras, R. Turlay, S. A. Wotton, M. Contalbrigo, K. Holtz, J. Cogan, Manfred Jeitler, M. Sozzi, M. Bender, G.D. Barr, Wojciech Wislicki, E. Imbergamo, H. D. Wahl, E. Olaiya, J. Duclos, D.J. Munday, G. Anzivino, J. Nassalski, Michael Andrew Parker, M. Cirilli, N. A. Molokanova, J. Ocariz, Niels Doble, B. Renk, P. F. Dalpiaz, P. Hristov, E. Rondio, I. Pellmann, E. Mazzucato, I. Augustin, G. Fischer, M. Pepe, G. D'Agostini, T.O. White, G. Unal, T.J. Gershon, M.D. Needham, B. Peyaud, Anton Taurok, B. Hay, R. Sacco, Fabrizio Petrucci, L. Köpke, A. Gonidec, Augusto Ceccucci, V. Schönharting, M. Markytan, M. Lenti, P.L. Frabetti, G. Collazuol, J.B. Cheze, Vladimir Kekelidze, Victoria Jane Martin, G.M. Pierazzini, G. Tatishvili, Lau Gatignon, Mayda Velasco, Michael Ziolkowski, A. Mestvirishvili, A. Tkatchev, M. Martini, H. Parsons, Louis Fayard, F. Marchetto, Alan W. Walker, A. I. Zinchenko, Konrad Kleinknecht, P. Cenci, H. Taureg, H.G. Becker, H. Blümer, A. Gianoli, C. Lazzeroni, A. Kalter, R. Granier de Cassagnac, Cristina Biino, Ivan Mikulec, G. Neuhofer, S. Crépé, V. Falaleev, R. Carosi, D. Madigojine, Luciano Musa, M. Pernicka, Roberta Arcidiacono, D.C. Cundy, Andrea Bizzeti, R. Casali, A. Norton, Y. Schué, B. Panzer-Steindel, H. Fox, A. Lacourt, C. Cerri, I. Wingerter-Seez, and Adrian John Bevan
Subjects: mesoni K, decadimenti rari, Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Bremsstrahlung, NA48 experiment
Abstract: We present the first observation of the decay KS→π+π−e+e− based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL→π+π−π0D decays as normalization sample, the branching ratio is measured to be BR(KS→π+π−e+e−)=[4.5±0.7(stat)±0.4(syst)]×10−5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung.
Published: 2000

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

Author: H.G. Becker, Cristina Biino, Ivan Mikulec, Vladimir Kekelidze, R. Turlay, M. Holder, D. Marras, G. Fischer, A. Gonidec, A. I. Zinchenko, Michael Ziolkowski, S. Luitz, I. Potrebenikov, Anton Taurok, G. Collazuol, M. Sozzi, S. A. Wotton, E. Iacopini, G. Govi, Konrad Kleinknecht, S. Schanne, A. Gianoli, Paolo Calafiura, Matthew Needham, B. Vallage, P. Grafström, R.W. Moore, I. Mannelli, J. Nassalski, R. Granier de Cassagnac, A. Lai, Andrea Formica, G. Kesseler, J.B. Cheze, M. Cirilli, Niels Doble, W. Kubischta, Michal Szleper, O. Boyle, P. F. Dalpiaz, A. Nappi, P. Hristov, P. Lubrano, P. Debu, R. Fantechi, H. D. Wahl, Giacomo Graziani, A. Mestvirishvili, M. Savrie, U. Koch, A. Winhart, Louis Fayard, G. Neuhofer, F. Marchetto, J. C. Chollet, F. Costantini, D. J. Munday, Milene Calvetti, H. Blümer, L. Köpke, M. Bender, I.G. Knowles, P. Buchholz, E. Menichetti, A. Kalter, B. Peyaud, M. Martini, Lydia Iconomidou-Fayard, D. Schinzel, J. Scheidt, B. Hay, Victoria Jane Martin, W. Wislicki, Michael Andrew Parker, S. Giudici, M. De Beer, E. Rondio, H. Dibon, J. Ocariz, Roberta Arcidiacono, G.D. Barr, H. Taureg, B. Renk, Augusto Ceccucci, S. Wronka, Mayda Velasco, V. Fanti, I. Wingerter, V. Schönharting, G. Tatishvili, O. Vossnack, Lau Gatignon, Benedetto Gorini, G. Unal, M. Porcu, A. Tkatchev, M. Pepe, D. Coward, Manfred Jeitler, J.P. Matheys, C. Cerri, J. Schmidt, Luciano Musa, G. Bocquet, I. Augustin, K.N. Moore, J. Duclos, Andrea Bizzeti, P. Cenci, J. Bremer, G. Anzivino, A. Norton, M. Pernicka, C. Ebersberger, G. Wirrer, D. Vattolo, S. Crépé, E. Mazzucato, M. Markytan, M. Lenti, H. Fox, A. Lacourt, R. Wilhelm, B. Panzer-Steindel, Fabrizio Petrucci, P.L. Frabetti, T. O. White, H. Parsons, Sandro Palestini, A. Michetti, Wolfgang Funk, R. Carosi, D.C. Cundy, Y. Schué, G.M. Pierazzini, M. Wittgen, and J. Cogan
Subjects: Pseudoscalar, Physics, Nuclear physics, Nuclear and High Energy Physics, Amplitude, Meson, Branching fraction, Form factor (quantum field theory), Alpha (ethology), Relative strength
Abstract: The decay rate of the neutral K meson KL→e+e−γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL→e+e−γ)/Γ(KL→all) = (1.06±0.02stat±0.02sys±0.04calc)×10−5. The parameter α K ∗ describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be α K ∗ =−0.36±0.06stat±0.02sys.
Published: 1999

32. Measurements of inclusive A production with large χF at the collider

Author: P.E. Schlein, Samim Erhan, J.B. Cheze, J. Zweizig, Achi Brandt, N. Ozdes, M.T. Zeyrek, Mike Medinnis, A. Kuzucu, and J. Zsembery
Subjects: Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Spectrometer, Intersecting Storage Rings, Monte Carlo method, Fragmentation function, Roman pot, Polarization (waves)
Abstract: We report results of inclusive measurements of A, produced in the forward direction at the with √s = 630 GeV, using the UA8 small angle Roman Pot spectrometers. These measurements cover the range in Feynman-χF and transverse momentum, 0.6 < χF < 1.0 and 0.4 < pt < 0.7 GeV, respectively. Within a systematic uncertainty of ±20% on the absolute cross section measurements, the results are indistinguishable from those made by some of us in two earliar experiments at the CERN Intersecting Storage Rings, with energies, √s = 53 and 62 GeV. In the χF-range, 0.6−0.9, the absolute cross sections are lower by a factor of 2 to 3 than the predictions of the Lund model as embodied in the PYTHIA 5.6 and JETSET 7.3 Monte Carlo programs, indicating inadequacies in knowledge of the baryon fragmentation function. For the largest χF-range, 0.9−1.0, the measurements agree with the Monte Carlo predictions. We have measured the average A polarization for our events and find (6±12%), consistent with previous measurements at the ISR in the present region of χF−pt.
Published: 1998

33. 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

34. High resolution drift chambers for the NA48 experiment at CERN

Author: G. Tarte, Stéphane Schanne, B. Vallage, F. Louis, J.B. Cheze, R. Turlay, D. Bederede, E. Mazzucato, S. Edard, O. Steinkamp, M. De Beer, B. Peyaud, L. Gosset, A. Migliori, J. Heitzmann, Dominique Durand, and P. Debu
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, CP violation, High resolution, NA48 experiment, High Energy Physics::Experiment, Instrumentation
Abstract: We discuss construction details of large drift chambers for the NA48 experiment at CERN. Preliminary measurements on their performance are also presented.
Published: 1995

35. The small angle spectrometer of experiment UA8 at the

Author: N. Ozdes, J.B. Cheze, A. Kuzucu, J. Zsembery, P.E. Schlein, S. Erhan, Mehmet Zeyrek, J. Ellett, P. Oillataguerre, A. Brandt, J. Zweizig, R. Jackson, and M. Medinnis
Subjects: Physics, Nuclear and High Energy Physics, Wire chamber, Spectrometer, Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Roman pot, law.invention, Optics, Data acquisition, law, Antiproton, Physics::Accelerator Physics, Collider, business, Instrumentation, Beam (structure)
Abstract: Experiment UA8 at the Sp p S-collider studied the production of hadronic jets in p p interactions which also contained final state protons or antiprotons with more than 90% of the full beam momentum of 315 GeV. Four Roman pot spectrometers were installed in interaction region LSS4 and interfaced to the data acquisition system of the UA2 calorimeter experiment, such that UA8 data could be logged on UA2 raw data tapes. In order to minimally perturb normal UA2 data acquisition and allow concurrent operation for the life of the experiment, an efficient high speed data-driven trigger processor was employed. The processor calculated the momentum of a track in a Roman pot spectrometer with 1.4% accuracy in 450 ns, thereby allowing a trigger decision to be made within 1.3 μs. We describe the integration of this processor into the high bandwidth readout of the UA8 wire chamber TDC system, and the on-line software package which monitored the hardware operation. The suppression of backgrounds from beam halo and multiple interactions in a bunch crossing is also discussed.
Published: 1993

36. 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

37. 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

38. 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

39. 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

40. First observation of the KS → π0γ γ decay

Author: Augusto Ceccucci, E. Olaiya, M. Markytan, M. Lenti, T. Cuhadar-Dönszelmann, E. Iacopini, P. Lubrano, P. Grafström, Rainer Wanke, S.A. Schmidt, E. Mazzucato, R.S. Dosanjh, E. Imbergamo, A. Gonidec, A. Lacourt, D. Madigojine, Nadia Pastrone, P. Debu, D. Marras, M. De Beer, G. Tatishvili, R. Fantechi, B. Vallage, G. Collazuol, M. Holder, G.M. Pierazzini, K. Holtz, Milene Calvetti, J. R. Batley, I. Mannelli, Victoria Jane Martin, M. Pernicka, M. Eppard, C. Cheshkov, H. Dibon, B. Panzer-Steindel, P. Rubin, M. Sozzi, S. A. Wotton, A. Peters, J. Nassalski, A. Hirstius, Michal Szleper, J.B. Cheze, Cristina Biino, Ivan Mikulec, Roberta Arcidiacono, C. Cerri, Luca Fiorini, A. Winhart, G. Bocquet, Yu. Potrebenikov, Mauro Piccini, M. Savrie, A. I. Zinchenko, E. Menichetti, G. Marel, A. Lai, G.E. Kalmus, R. Casali, A. Gianoli, R. Granier de Cassagnac, M. Wittgen, Benedetto Gorini, Andrea Formica, I. Pellmann, Cristina Lazzeroni, N. A. Molokanova, F. Derue, Konrad Kleinknecht, Anton Taurok, M. Cirilli, Niels Doble, T.O. White, G. Graziani, V. Falaleev, Louis Fayard, F. Marchetto, R. Sacco, G. Neuhofer, Lau Gatignon, I. Wingerter-Seez, Manfred Jeitler, J. Duclos, G. Unal, Andrea Bizzeti, G. Anzivino, W. Kubischta, I. Mestvirishvili, G. Gouge, F. Costantini, H. D. Wahl, F. Martelli, D.C. Cundy, B. Peyaud, S. Wronka, Alexi Mestvirishvili, Vladimir Kekelidze, L. Widhalm, P. Cenci, Y. Schué, Fabrizio Petrucci, J. C. Chollet, A. Nappi, M. Contalbrigo, M. Martini, Michael Ziolkowski, P.L. Frabetti, U. Koch, S. Giudici, A. Maier, P. Hristov, Nicolo Cartiglia, Michael Andrew Parker, G.D. Barr, Alan W. Walker, L. Köpke, W. Wislicki, V. Schönharting, E. Rondio, P. F. Dalpiaz, M. Pepe, T.J. Gershon, D.J. Munday, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, M. Veltri, A. Norton, and R. Turlay
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, Large Hadron Collider, decadimenti, 010308 nuclear & particles physics, Branching fraction, Detector, 01 natural sciences, mesoni K, Nuclear physics, 0103 physical sciences, 010306 general physics
Abstract: Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory predictions. © 2003 Elsevier B.V. All rights reserved.
Published: 2004

41. Precise measurements of the KS → γγ and KL → γγ decay rates

Author: A Lai, D Marras, J.R Batley, R.S Dosanjh, T.J Gershon, G.E Kalmus, C Lazzeroni, D.J Munday, E Olaiya, M.A Parker, T.O White, S.A Wotton, R Arcidiacono, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Dönszelmann, D Cundy, N Doble, V Falaleev, L Gatignon, A Gonidec, B Gorini, P Grafström, W Kubischta, A Lacourt, I Mikulec, A Norton, B Panzer-Steindel, G Tatishvili, H Wahl, C Cheshkov, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Yu Potrebenikov, A Zinchenko, V Martin, P Rubin, R Sacco, A Walker, M Contalbrigo, P Dalpiaz, J Duclos, P.L Frabetti, A Gianoli, M Martini, F Petrucci, M Savrié, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, M Lenti, F Martelli, M Veltri, M Eppard, A Hirstius, K Holtz, K Kleinknecht, U Koch, L Köpke, P Lopes da Silva, P Marouelli, I Mestvirishvili, I Pellmann, A Peters, S.A Schmidt, V Schönharting, Y Schué, R Wanke, A Winhart, M Wittgen, J.C Chollet, L Fayard, L Iconomidou-Fayard, G Unal, I Wingerter-Seez, G Anzivino, P Cenci, E Imbergamo, P Lubrano, A Mestvirishvili, A Nappi, M Pepe, M Piccini, R Casali, C Cerri, M Cirilli, F Costantini, R Fantechi, L Fiorini, S Giudici, I Mannelli, G Pierazzini, M Sozzi, J.B Cheze, M De Beer, P Debu, F Derue, A Formica, R Granier de Cassagnac, G Gouge, G Marel, E Mazzucato, B Peyaud, R Turlay, B Vallage, M Holder, A Maier, M Ziolkowski, C Biino, N Cartiglia, F Marchetto, E Menichetti, N Pastrone, J Nassalski, E Rondio, M Szleper, W Wislicki, S Wronka, H Dibon, M Jeitler, M Markytan, G Neuhofer, M Pernicka, A Taurok, and L Widhalm
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Chiral perturbation theory, Large Hadron Collider, Branching fraction, decadimenti, Astrophysics::High Energy Astrophysical Phenomena, Detector, Intensity (physics), Gamma gamma, Nuclear physics, mesoni K, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract: The KS → γγ decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(KS → γγ) = (2.78 ± 0.06stat ± 0.04syst) x 10-6, obtained from 7461 ± 172 KS → γγ events, is significantly higher than the O(p4) prediction of chiral perturbation theory. Using a KL beam the ratio Γ(KL → γγ)/Γ(KL → π0π0π0) = (2.81 ± 0.02syst) ×10-3 has been measured. © 2002 Elsevier Science B.V. All rights reserved.
Published: 2003

42. 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

43. A precision measurement of direct CP violation in the decay of neutral kaons into two pions

Author: J.R Batley, R.S Dosanjh, T.J Gershon, G.E Kalmus, C Lazzeroni, D.J Munday, E Olaiya, M Patel, M.A Parker, T.O White, S.A Wotton, R Arcidiacono, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Dönszelmann, D Cundy, N Doble, V Falaleev, L Gatignon, A Gonidec, B Gorini, P Grafström, W Kubischta, I Mikulec, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, H Wahl, C Cheshkov, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Yu Potrebenikov, A Zinchenko, P Rubin, R Sacco, A Walker, D Bettoni, R Calabrese, P Dalpiaz, J Duclos, P.L Frabetti, A Gianoli, M Martini, L Masetti, F Petrucci, M Savrié, M Scarpa, A Bizzeti, M Calvetti, G Collazuol, E Iacopini, M Lenti, F Martelli, G Ruggiero, M Veltri, D Coward, M Eppard, A Hirstius, K Holtz, K Kleinknecht, U Koch, L Köpke, P Lopes da Silva, P Marouelli, I Mestvirishvili, C Morales, I Pellmann, A Peters, B Renk, S.A Schmidt, V Schönharting, R Wanke, A Winhart, J.C Chollet, L Fayard, G Graziani, L Iconomidou-Fayard, G Unal, I Wingerter-Seez, G Anzivino, P Cenci, E Imbergamo, G Lamanna, P Lubrano, A Mestvirishvili, A Nappi, M Pepe, M Piccini, M Valdata-Nappi, R Casali, C Cerri, M Cirilli, F Costantini, R Fantechi, L Fiorini, S Giudici, I Mannelli, G Pierazzini, M Sozzi, J.B Cheze, M De Beer, P Debu, F Derue, A Formica, G Gouge, G Marel, E Mazzucato, B Peyaud, R Turlay, B Vallage, M Holder, A Maier, M Ziolkowski, C Biino, N Cartiglia, M Clemencic, F Marchetto, E Menichetti, N Pastrone, J Nassalski, E Rondio, W Wislicki, S Wronka, H Dibon, M Jeitler, M Markytan, G Neuhofer, M Pernicka, A Taurok, L Widhalm, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA48, and Kerec, Hélène
Subjects: neutral kaon, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], PREDICTION, direct CP violation, STANDARD MODEL, FOS: Physical sciences, neutral kaons, CP violation, epsilon'/epsilon parameter, mesoni K, decadimenti, violazione dretta dii CP, K meson, decay, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, EPSILON'/EPSILON, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], MESON SYSTEM, CRYSTAL, 010306 general physics, Physics, kaon decay, Large Hadron Collider, 010308 nuclear & particles physics, NA48 experiment, Yield (chemistry), High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: The direct CP violation parameter Re(epsilon'/epsilon) has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. The 2001 running period was devoted to collecting additional data under varied conditions compared to earlier years (1997-99). The new data yield the result: Re(epsilon'/epsilon) = (13.7 +/- 3.1) times 10^{-4}. Combining this result with that published from the 1997, 98 and 99 data, an overall value of Re(epsilon'/epsilon) = (14.7 +/- 2.2) times 10^{-4} is obtained from the NA48 experiment., Comment: 19 pages, 5 figures, to be published in Physics Letters B
Published: 2002

44. New measurements of the η and K0 masses

Author: A. Lai, D. Marras, J.R. Batley, A.J. Bevan, R.S. Dosanjh, T.J. Gershon, G.E. Kalmus, C. Lazzeroni, D.J. Munday, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, V. Falaleev, W. Funk, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, M. Lenti, I. Mikulec, A. Norton, S. Palestini, B. Panzer-Steindel, D. Schinzel, G. Tatishvili, H. Taureg, M. Velasco, H. Wahl, C. Cheskov, P. Hristov, V. Kekelidze, D. Madigojine, N. Molokanova, Yu. Potrebenikov, A. Zinchenko, V.J. Martin, P. Rubin, R. Sacco, A. Walker, D. Bettoni, R. Calabrese, M. Contalbrigo, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, E. Luppi, M. Martini, L. Masetti, F. Petrucci, M. Savrié, M. Scarpa, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, F. Martelli, M. Veltri, H.G. Becker, M. Eppard, H. Fox, A. Hirstius, K. Holtz, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Marouelli, I. Mestvirishvili, I. Pellmann, A. Peters, S.A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J.C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, G. Lamanna, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, J.B. Cheze, J. Cogan, M. De Beer, P. Debu, F. Derue, A. Formica, G. Gouge, R. Granier de Cassagnac, G. Marel, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, R. Guida, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, M. Pernicka, A. Taurok, and L. Widhalm
Subjects: mass measurement, Physics, eta meson, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, NA48 EXPERIMENT, Physics::Instrumentation and Detectors, Detector, MESON, CERN, mesoni K, mesoni eta, massa mesoni, K meson, High Energy Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: New measurements of the $\eta$ and $K^0$ masses have been performed using decays to 3$\pi^0$ with the NA48 detector at the CERN SPS. Using symmetric decays to reduce systematic effects, the results $M(\eta) = 547.843\pm0.051$ MeV/c$^2$ and $M(K^0) = 497.625\pm0.031$ MeV/c$^2$ were obtained., Comment: 17 pages, 4 figures to be published in Physics Letters B
Published: 2002

45. Measurement of the quadratic slope parameter in the K-L -> 3 pi(0) decay Dalitz plot

Author: G. Fischer, Milene Calvetti, G. Govi, W. Kubischta, P. Lubrano, H. Dibon, Nadia Pastrone, D. J. Munday, S.A. Schmidt, M. Markytan, M. Eppard, B. Vallage, P.L. Frabetti, E. Imbergamo, M. Lenti, J. Ocariz, G. Pierazzini, I.G. Knowles, T. O. White, D. Madigojine, H. Parsons, Alan W. Walker, C. Cerri, H. Blümer, Giacomo Graziani, A. Peters, P. F. Dalpiaz, M. Pepe, S. Giudici, M. Wittgen, I. Wingerter, S. Wronka, G. D'Agostini, E. Olaiya, H. Fox, Victoria Jane Martin, J. Cogan, R.S. Dosanjh, N. A. Molokanova, K. Holtz, Peter Zahariev Hristov, E. Iacopini, U. Koch, R. Sacco, Louis Fayard, F. Marchetto, A. Lacourt, G.D. Barr, P. Debu, Mayda Velasco, Rainer Wanke, P. Grafström, J.P. Matheys, Sandro Palestini, W. Wislicki, M. Martini, I. Pellmann, J. Nassalski, Vladimir Kekelidze, G. Tatishvili, A. Nappi, A. I. Zinchenko, C. Cheshkov, M. Sozzi, A. Gianoli, F. Costantini, C. Lazzeroni, A. Gonidec, D. Marras, Konrad Kleinknecht, R. Granier de Cassagnac, R. Casali, B. Hay, Augusto Ceccucci, G. Collazuol, Matthew Needham, B. Panzer-Steindel, A. Winhart, S. A. Wotton, G. Kalmus, H.G. Becker, Benedetto Gorini, Mauro Piccini, Lydia Iconomidou-Fayard, Niels Doble, J.-C. Chollet, Cristina Biino, Ivan Mikulec, H. Taureg, V. Falaleev, Manfred Jeitler, E. Mazzucato, M. Bender, J. Duclos, G. Anzivino, G. Neuhofer, S. Luitz, R. Carosi, A. Lai, D.C. Cundy, Andrea Formica, Luciano Musa, Y. Schué, A. Norton, Andrea Bizzeti, H. D. Wahl, B. Peyaud, Michael Andrew Parker, Michael Ziolkowski, G. Unal, E. Rondio, V. Schönharting, I. Augustin, Anton Taurok, M. Holder, M. Cirilli, A. Mestvirishvili, M. Savrie, G. Bocquet, Yu. Potrebenikov, M. Pernicka, S. Crépé, Adrian John Bevan, R. Turlay, M. De Beer, Michal Szleper, E. Menichetti, T.J. Gershon, B. Renk, I. Mannelli, J.B. Cheze, F. Petrucci, M. Contalbrigo, L. Köpke, Lau Gatignon, P. Cenci, A. Kalter, Roberta Arcidiacono, and R. Fantechi
Subjects: Physics, neutral kaon, Particle physics, Nuclear and High Energy Physics, Large Hadron Collider, mesoni K, decadimenti, Dalitz plot, kaon decay, dalitz plot, slope parameters, NA48 experiment, Value (computer science), Kaons, High Energy Physics - Experiment, Classical mechanics, Quadratic equation, 3-PI%22">K->3-PI
Abstract: A value of (-6.1 +- 0.9_{stat} +- 0.5_{syst})*10^{-3} is obtained for the quadratic slope parameter h in the K_L -> 3\pi^0 decay Dalitz plot at the NA48 experiment at the CERN SPS. The result is based on 14.7*10^6 fully reconstructed K_L -> 3\pi^0 -> 6\gamma decays. This is the most precise measurement of any of the Dalitz plot slope parameters in the charged and neutral kaon decays so far., Comment: 13 pages, 3 figures, 2 tables
Published: 2001

46. A new measurement of the branching ratio of K(S) → γ γ

Author: M. Wittgen, N. A. Molokanova, J. Cogan, M. De Beer, I. Pellmann, T.O. White, G. Unal, H. Fox, G. Neuhofer, A. Nappi, E. Rondio, A. Lacourt, H. D. Wahl, C. Cheshkov, Vladimir Kekelidze, R. Carosi, D.C. Cundy, R. Turlay, M. Contalbrigo, B. Peyaud, B. Hay, Benedetto Gorini, Manfred Jeitler, A. Winhart, P. F. Dalpiaz, J. Duclos, G. Anzivino, Y. Schué, Nadia Pastrone, A. Maier, B. Vallage, Michal Szleper, P. Hristov, Mauro Piccini, G.M. Pierazzini, T.J. Gershon, Louis Fayard, F. Marchetto, B. Panzer-Steindel, G. Bocquet, Yu. Potrebenikov, R. Fantechi, Sandro Palestini, J. C. Chollet, Milene Calvetti, I.G. Knowles, M. Savrie, E. Menichetti, Michael Ziolkowski, L. Köpke, R.S. Dosanjh, G.D. Barr, Giacomo Graziani, L. Widhalm, G.E. Kalmus, M. Markytan, M. Lenti, S. Giudici, Lau Gatignon, H. Dibon, A. Peters, M. Veltri, H.G. Becker, A. Lai, Andrea Formica, S. Wronka, K. Holtz, Fabrizio Petrucci, A. Tkatchev, H. Taureg, Konrad Kleinknecht, D. Madigojine, Nicolo Cartiglia, Augusto Ceccucci, P.L. Frabetti, A. Norton, Cristina Biino, Ivan Mikulec, Michael Andrew Parker, D. Marras, J.B. Cheze, P. Cenci, P. Lubrano, S.A. Schmidt, M. Sozzi, F. Costantini, P. Lopes da Silva, A. Kalter, G. Govi, R. Sacco, M. Holder, E. Imbergamo, Alan W. Walker, A. Gonidec, Andrea Bizzeti, Lydia Iconomidou-Fayard, P. Marouelli, V. Schönharting, I. Wingerter-Seez, W. Kubischta, G. Tatishvili, G. Collazuol, L. Bertanza, M. Cirilli, Roberta Arcidiacono, R. Casali, Adrian John Bevan, E. Iacopini, Niels Doble, P. Grafström, V. Falaleev, T. Cuhadar-Dö, C. Cerri, D.J. Munday, J. Nassalski, M. Pepe, G. D'Agostini, U. Koch, M. Martini, P. Debu, S. A. Wotton, A. Gaponenko, Rainer Wanke, M. Eppard, G. Fischer, Anton Taurok, A. Mestvirishvili, M. Pernicka, F. Martelli, Wojciech Wislicki, A. I. Zinchenko, A. Gianoli, Cristina Lazzeroni, R. Granier de Cassagnac, Roberto Guida, E. Olaiya, E. Mazzucato, Victoria Jane Martin, Mayda Velasco, I. Mannelli, J. Ocariz, and B. Renk
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, mesoni K, decadimenti, Large Hadron Collider, Branching fraction, Detector
Abstract: The decay rate of KS → γγ has been measured with the NA48 detector at the CERN SPS. A total of 149 KS → γγ events have been observed. The branching ratio is determined to be (2.58±0.36(stat)±0.22(sys))×10−6.
Published: 2000

47. 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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48. Evidence for a super-hard Pomeron structure

Author: S. Erhan, J. Zweizig, J. Zsembery, P.E. Schlein, J.B. Cheze, Andrew Brandt, A. Kuzucu, M. Medinnis, N. Ozdes, and Mehmet Zeyrek
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Parton, Elementary particle, Jet (particle physics), law.invention, Gluon, Nuclear physics, Pomeron, law, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider, Particle Physics - Experiment
Abstract: Results are presented from a study of jet production in p p interactions with √s=630 GeV at the CERN S p p S- Collider, which are tagged by a proton or antiproton which possesses more than 90% of the incident beam momentum. The hard scattering which occurs between a parton in a beam particle and another in the soft residual component (pomeron-dominated) of the tagged proton allows the pomeron's partonic structure to be investigated. The observed jet distributions are in good agreement with expectations for hard parton-parton cattering in QCD. The pomeron exhibits a hard structure like 1 − x. However, there is an additionalsignificant (30%) δ-function-like component, in which the entire momentum of the pomeron seems to participate in the hard scattering.
Published: 1992

49. Further evidence for pomeron-quark interactions: observation of large $\Lambda^{0}$ polarization in pp --> ($\Lambda^{0}$K$^{+}$)p

Author: J.B. Cheze, B. Povh, T. Henkes, A. M. Smith, J. Alitti, P.E. Schlein, J. Zweizig, J. Zsembery, P. Sherwood, S. Erhan, M. Medinnis, and R. Bonino
Subjects: Physics, Nuclear physics, Quark, Nuclear and High Energy Physics, Pomeron, Particle physics, Large Hadron Collider, Spectrometer, Direct evidence, Intersecting Storage Rings, Rest frame, Polarization (waves), Particle Physics - Experiment
Abstract: We report an analysis of the diffractive reaction pp→( Λ 0 K + )p, measured at r√ s =63 GeV in an open geometry forw spectrometer experiment at the CERN Intersecting Storage Rings. In the rest frame of the (Λ 0 K + ) system, which has nearly the beam momentum of 31.4 GeV, the Λ 0 is observed to be sharply peaked forward, similar to earlier observations in the reaction pp→( Λ 0 φ 0 K + )p, which were interpreted as the first direct evidence for pomeron-quark interactions. A smaller backward peak is also observed which may be evidence for pomeron-diquark interactions. The polarization of the Λ 0 increases to more than 60% when the diffractive mass reaches ≈2.8 GeV.
Published: 1992

50. Comparison of and pp elastic scattering with 0.6<t<2.1 GeV2 at the CERN-ISR

Author: A. Montag, M. Reyrolle, S. Vernetto, B. Bloch-Devaux, A. M. Smith, L. Meritet, P.E. Schlein, S. Erhan, J. Mallet, R. Bonino, A. Castellina, F. Vazeille, J. Alitti, P. Sherwood, M. Medinnis, J. Zweizig, L. Zawiejski, J.B. Cheze, and J. Zsembery
Subjects: Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Antiproton, Intersecting Storage Rings, Scattering, Antimatter, Momentum transfer, Hadron, Nucleon
Abstract: pp and pp elastic scattering differential cross sections are presented for momentum transfer 0.6
Published: 1985

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