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1. apeNEXT: a Multi-TFlops Computer for Elementary Particle Physics.

Author

François Bodin, Philippe Boucaud, Nicola Cabibbo, F. Di Carlo, Roberto De Pietri, F. Di Renzo, H. Kaldass, Alessandro Lonardo, Maxim Lukyanov, Sergio de Luca, Jacques Micheli, Vincent Morenas, Norbert Paschedag, Olivier Pène, Dirk Pleiter, Federico Rapuano, L. Sartori, Sebastiano Fabio Schifano, Hubert Simma, Raffaele Tripiccione, and Piero Vicini

Published
2003

2. Computing for LQCD: apeNEXT.

Author

Francesco Belletti, Sebastiano Fabio Schifano, Raffaele Tripiccione, François Bodin, Philippe Boucaud, Jacques Micheli, Olivier Pène, Nicola Cabibbo, Sergio de Luca, Alessandro Lonardo, Davide Rossetti, Piero Vicini, Maxim Lukyanov, Laurent Morin, Norbert Paschedag, Hubert Simma, Vincent Morenas, Dirk Pleiter, and Federico Rapuano

Published
2006
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3. The Teraflop Parallel Computer APEmille.

Author

F. Aglietti, A. Bartolini, Claudia Battista, Simone Cabasino, M. Cosimi, A. Michelotti, A. Monello, Emanuele Panizzi, Pier Stanislao Paolucci, W. Rinaldi, Davide Rossetti, Hubert Simma, Mario Torelli, Piero Vicini, Nicola Cabibbo, E. Centurioni, W. Errico, F. Laico, Guido Magazzù, and Raffaele Tripiccione

Published
1997
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4. The APE-100 Computer: (I) the Architecture.

Author

Claudia Battista, Simone Cabasino, Francesco Marzano, Pier Stanislao Paolucci, Jarda Pech, Federico Rapuano, Renata Sarno, Gian Marco Todesco, Mario Torelli, Walter Tross, Piero Vicini, Nicola Cabibbo, Enzo Marinari, Giorgio Parisi, Gaetano Salina, Filippo del Prete, Adriano Lai, Maria Paola Lombardo, Raffaele Tripiccione, and Adolfo Fucci

Published
1993
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5. Latest results on rare kaon decays from the NA48/2 experiment at CERN

Author

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

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

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

Published
2021

7. Unitary Symmetry and Leptonic Decays

Author

Nicola Cabibbo

Subjects
Physics, Particle physics, Cabibbo–Kobayashi–Maskawa matrix, Branching fraction, Eightfold Way, General Physics and Astronomy, Electron, Lambda, XX, Quark–lepton complementarity, Nuclear physics, High Energy Physics::Experiment, Neutron, Lepton
Abstract

An analysis of leptonic decays based on unitary symmetry for strong interactions (eightfold way) and the V-A theory for weak interactions is presented. An explanation for the observed predominance of the LAMBDA yields + e/sup -/ + nu decay over the LAMBDA /sup -/ yields n + e/sup -/ + nu decay is obtained. Branching ratios predicted for electron modes with DELTA S, 1 are presented; the ratios for the above decays agree well with experimental results. (D.C.W.)

Published
2018
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9. An Introduction to Gauge Theories

Author

Nicola Cabibbo, Luciano Maiani, Omar Benhar, Nicola Cabibbo, Luciano Maiani, and Omar Benhar

Subjects
QC793.3.G38
Abstract

Written by world-leading experts in particle physics, this new book from Luciano Maiani and Omar Benhar, with contributions from the late Nicola Cabibbo, is based on Feynman's path integrals. Key elements of gauge theories are described—Feynman diagrams, gauge-fixing, Faddeev-Popov ghosts—as well as renormalization in Quantum Electrodynamics. Quarks and QCD interactions are introduced. Renormalization group and high momentum behaviour of the coupling constants is discussed in QED and QCD, with asymptotic freedom derived at one-loop. These concepts are related to the Higgs boson and models of grand unification.'… an excellent introduction to the quantum theory of gauge fields and their applications to particle physics. … It will be an excellent book for the serious student and a good reference for the professional practitioner. Let me add that, scattered through the pages, we can find occasional traces of Nicola Cabibbo's style.'—John Iliopoulos, CNRS-Ecole Normale Supérieure'… The volume ends with an illuminating description of the expectation generated by the recent discovery of the Higgs boson, combined with the lack of evidence for super-symmetric particles in the mass range 0.6-1 TeV.'—Arturo Menchaca-Rocha, FinstP, Professor of Physics, Mexico's National Autonomous University, Former President of the Mexican Academy of Sciences, Presidential Advisor'…The reader is masterfully guided through the subtleties of the quantum field theory and elementary particle physics from simple examples in Quantum Mechanics to salient details of modern theory.'—Mikhail Voloshin, Professor of Physics, University of Minnesota

Published
2017

10. 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
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11. 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

14. Quantum Electrodynamics

Author

Nicola Cabibbo, Omar Benhar, and Luciano Maiani

Subjects
Pure mathematics, symbols.namesake, symbols, Feynman diagram, Mathematical physics, Mathematics, S-matrix
Published
2017
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15. The Electromagnetic Field

Author

Nicola Cabibbo, Luciano Maiani, and Omar Benhar

Subjects
Algebra, Identity (philosophy), media_common.quotation_subject, Homogeneous space, Equations of motion, Mathematics, media_common, Mathematical physics
Published
2017
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24. Towards a Field Theory

Author

Nicola Cabibbo, Luciano Maiani, and Omar Benhar

Subjects
Physics, symbols.namesake, Theoretical physics, symbols, Feynman diagram, Field theory (psychology)
Published
2017
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32. A new measurement of the K±→π±γγ decay at the NA48/2 experiment

Author

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

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

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

Published
2014
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33. Neutral pion form factor measurement by the NA62 experiment

Author

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

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

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

Published
2017

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

Author

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

Subjects
Normalization (statistics), Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Branching fraction, Scattering, Hadron, Form factor (quantum field theory), 01 natural sciences, Nuclear physics, 0103 physical sciences, Pi, Relative precision, 010306 general physics
Abstract

A sample of more than one million K±→π+π−e±ν ( Ke4 ) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003–2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of Ke4γ decays, is measured to be BR(Ke4)=(4.257±0.016exp±0.031ext)×10−5 with a total relative error of 0.8% . This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the ππ scattering lengths conducted on the same data sample. The overall form factor normalization fs=5.705±0.017exp±0.031ext is obtained with a total relative precision of 0.6% .

Published
2012
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36. New measurement of the K±→π±μ+μ− decay

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Antiparticle, Muon, Pion, Meson, Branching fraction, Analytical chemistry, Lepton, Dimensionless quantity
Abstract

A sample of 3120 K ± → π ± μ + μ − decay candidates with ( 3.3 ± 0.7 ) % background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a detailed study of the decay properties. The branching ratio was measured to be BR = ( 9.62 ± 0.25 ) × 10 − 8 . The form factor W ( z ) , where z = ( M μ μ / M K ) 2 , was parameterized according to several models. In particular, the slope of the linear form factor W ( z ) = W 0 ( 1 + δ z ) was measured to be δ = 3.11 ± 0.57 . Upper limits of 2.9 × 10 − 2 and 2.3 × 10 − 2 on possible charge asymmetry and forward–backward asymmetry were established at 90% CL. An upper limit BR ( K ± → π ∓ μ ± μ ± ) 1.1 × 10 − 9 was established at 90% CL for the rate of the lepton number violating decay.

Published
2011
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37. Empirical parameterization of the K±→π±π0π0 decay Dalitz plot

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Monte Carlo method, Dalitz plot, 01 natural sciences, Pion, Isospin, 0103 physical sciences, Quasinormal mode, High Energy Physics::Experiment, Invariant mass, Anomaly (physics), Nuclear Experiment, 010306 general physics
Abstract

As first observed by the NA48/2 experiment at the CERN SPS, the π0π0 invariant mass (M00) distribution from K±→π±π0π0 decay shows a cusp-like anomaly at M00=2m+, where m+ is the charged pion mass. An analysis to extract the ππ scattering lengths in the isospin I=0 and I=2 states, a0 and a2, respectively, has been recently reported. In the present work the Dalitz plot of this decay is fitted to a new empirical parameterization suitable for practical purposes, such as Monte Carlo simulations of K±→π±π0π0 decays.

Published
2010
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38. First observation and measurement of the decay K±→π±e+e−γ

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Chiral perturbation theory, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Analytical chemistry, 01 natural sciences, Nuclear physics, Particle decay, Pion, 0103 physical sciences, 010306 general physics, Dimensionless quantity
Abstract

Using the full data set of the NA48/2 experiment, the decay K ± → π ± e + e − γ is observed for the first time, selecting 120 candidates with 7.3 ± 1.7 estimated background events. With K ± → π ± π D 0 as normalisation channel, the branching ratio is determined in a model-independent way to be Br ( K ± → π ± e + e − γ , m e e γ > 260 MeV / c 2 ) = ( 1.19 ± 0.12 stat ± 0.04 syst ) × 10 −8 . This measured value and the spectrum of the e + e − γ invariant mass allow a comparison with predictions of chiral perturbation theory.

Published
2008
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39. 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

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

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Dalitz plot, Particle Data Group, Atomic physics, Order of magnitude
Abstract

The distribution of the K ± → π ± π + π − decays in the Dalitz plot has been measured by the NA48/2 experiment at the CERN SPS with a sample of 4.71 × 10 8 fully reconstructed events. With the standard Particle Data Group parameterization the following values of the slope parameters were obtained: g = ( − 21.134 ± 0.017 ) % , h = ( 1.848 ± 0.040 ) % , k = ( − 0.463 ± 0.014 ) % . The quality and statistical accuracy of the data have allowed an improvement in precision by more than an order of magnitude, and are such as to warrant a more elaborate theoretical treatment, including pion–pion rescattering, which is in preparation.

Published
2007
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41. Measurements of charged kaon semileptonic decay branching fractions K±→π0μ±ν and K±→π0e±ν and their ratio

Author

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

Subjects
semileptonic kaon decays, CKM matrix, Semileptonic decay, Particle physics, Physics and Astronomy (miscellaneous), kaon decay, BRANCHING FRACTION, Branching (polymer chemistry), NO, High Energy Physics - Experiment, mesoni K, Nuclear physics, decadimenti, MONTE-CARLO, RADIATIVE-CORRECTIONS, PHOTOS, Pi, Kaon decays, Engineering (miscellaneous), Physics, Science & Technology, Unitarity, Cabibbo–Kobayashi–Maskawa matrix, PHYSICS, PARTICLES & FIELDS, semileptonic decay, semileptonic kaon decays, CKM matrix, Physical Sciences
Abstract

Measured ratios of decay rates for Ke3/K2\pi, K\mu3/K2\pi and K\mu3/Ke3 are presented. These measurements are based on K^+- decays collected in a dedicated run in 2003 by the NA48/2 experiment at CERN. The results obtained are Ke3/K2\pi = 0.2470 +/- 0.0009 (stat) +/- 0.0004 (syst) and K\mu3/K2\pi = 0.1637 +/- 0.0006 (stat) +/- 0.0003 (syst). Using the PDG average for the K^+- -> \pi^+-\pi^0 normalisation mode, both values are found to be larger than the current values given by the Particle Data Book and lead to a larger magnitude of the |V_{us}| CKM element than previously accepted. When combined with the latest Particle Data Book value of |V_{ud}|, the result is in agreement with unitarity of the CKM matrix. In addition, a new measured value of K\mu3/Ke3 = 0.663 +/- 0.003(stat) +/- 0.001(syst) is compared to the semi-empirical predictions based on the latest form factor measurements., Comment: 20 pages, 5 tables, 10 figures. Published in European Physical Journal C 50 2 (2007), contains erratum submitted to European Physical Journal C

Published
2007
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42. 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

43. S<scp>EMILEPTONIC</scp> H<scp>YPERON</scp> D<scp>ECAYS</scp>

Author

E. C. Swallow, Roland Winston, and Nicola Cabibbo

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Unitarity, Cabibbo–Kobayashi–Maskawa matrix, Hyperon, Degrees of freedom (physics and chemistry), Form factor (quantum field theory), FOS: Physical sciences, High Energy Physics - Experiment, Baryon, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Beta (velocity)
Abstract

We review the status of hyperon semileptonic decays. The central issue is the $V_{us}$ element of the CKM matrix, where we obtain $V_{us}=0.2250 (27)$. This value is of similar precision, but higher, than the one derived from $K_{l3}$, and in better agreement with the unitarity requirement, $|V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2=1$. We find that the Cabibbo model gives an excellent fit of the existing form factor data on baryon beta decays ($\chi^{2} = 2.96$ for 3 degrees of freedom) with $F + D = 1.2670 \pm 0.0030$, $F - D = -0.341 \pm 0.016$, and no indication of flavour-SU(3)-breaking effects. We indicate the need of more experimental and theoretical work, both on hyperon beta decays and on $K_{l3}$ decays., Comment: 37 pages, 8 figures, 4 tables, Final version of this material is scheduled to appear in the Annual Review of Nuclear and Particle Science Vol. 53

Published
2003
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44. CONCLUDING REMARKS

Author

Nicola Cabibbo

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Physics::Instrumentation and Detectors, CP violation, High Energy Physics::Experiment, Astronomy and Astrophysics, Neutrino oscillation, Atomic and Molecular Physics, and Optics, Lepton
Abstract

Important new results have been presented at this conference. The direct violation of CP in K0 → π + π has been firmly established in two independent experiments, NA48 at CERN and KTeV at Fermilab. Both Babar at SLAC and Belle at Kek have determined the CP violation in [Formula: see text] oscillations through the study of the golden KS + Ψ decay mode. The observed CP violation agrees with the expectations of the Standard model, based on the quark-mixing phenomenon. The first results of the Sudbury Neutrino Observatory, SNO, suggest that the long-lasting solar neutrino puzzle has been finally solved in terms of neutrino oscillations. Results appeared after the conference which modify the theoretical prediction of the muon anomaly. This new result, if confirmed, would drastically reduce the significance of the discrepancy between the theoretically expected value for the muon anomaly and the recent results of the Brookhaven experiment.

Published
2002
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45. 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

46. 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

47. Whatever happened to Europe's high-performance computing?

Author

Agostino Mathis and Nicola Cabibbo

Subjects
business.industry, Computer science, Electrical engineering, General Physics and Astronomy, Contrast (music), Current (fluid), business, Plateau (mathematics), Supercomputer, Power (physics)
Abstract

Nowadays high-performance computing is synonymous with parallel computing. We appear to have reached a plateau in terms of the maximum computing power that can be obtained with a single processor based on current silicon technology. In contrast, parallel computers – computers which are based on more than one processor and sometimes contain as many as several thousand processors – continue to grow.

Published
1995
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48. INFN: an Italian role-model

Author

Nicola Cabibbo

Subjects
Role model, Agency (sociology), General Physics and Astronomy, Commission, Public administration
Abstract

With a 1993 budget of about L445bn (£209m), the Istituto Nazionale di Fisica Nucleare (INFN) plays a very significant role in the Italian physics community. Responsible for research in subnuclear and nuclear physics and related technological developments, the agency's budget ranks fourth behind those of the Consiglio Nazionale delle Ricerche (L1090bn), the Italian Space Agency (L800bn), and the Commission for Nuclear and Alternative Energy Sources, ENEA (L600bn), but greatly exceeds the funds spent by any of those agencies in physics. It is the only source of funds within Italy for nuclear and subnuclear physics.

Published
1993
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49. 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
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50. Relativistic theory of particles with arbitrary intrinsic angular momentum

Author

Ettore Majorana and Nicola Cabibbo

Subjects
Physics, Angular momentum, Classical mechanics, Total angular momentum quantum number, Angular momentum of light, Angular momentum coupling, Orbital angular momentum of light, Angular momentum operator, Invariant (physics), Wave equation
Abstract

The author establishes wave equations for particles having arbitrary given intrinsic angular momentum. Such equations are linear in the energy and relativistically invariant.

Published
2007
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