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Start Over Author "C. Cerri" Journal the european physical journal c
5 results on '"C. Cerri"'

1. 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

2. 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

3. Search for the lepton flavour violating decay $$\mu ^+ \rightarrow \mathrm {e}^+ \gamma $$ µ + ? e + ? with the full dataset of the MEG experimentMEG Collaboration

Author

Toshinori Mori, M. Hildebrandt, Donato Nicolo, N. V. Khomutov, T. I. Kang, Francesco Grancagnolo, Z. Hodge, G. Boca, Marco Grassi, A. Mtchedilishvili, A. Pepino, Akira Yamamoto, A. Popov, Roberto Di Nardo, E. Baracchini, A. Corvaglia, D. Mzavia, G. Tassielli, Flavio Gatti, M. De Gerone, S. Ogawa, J. Egger, Fabio Morsani, A. Maki, Michele Biasotti, Yasunori Fujii, Satoshi Mihara, F. Berg, S. Nakaura, C. Voena, G. Rutar, E. Ripiccini, N. Kravchuk, G. M. A. Lim, Angela Papa, Wataru Ootani, C. Chiri, A. S. Korenchenko, G. Pizzigoni, D. Zanello, F. Ignatov, B.I. Khazin, C. Bemporad, Yury V. Yudin, S. Orito, Yusuke Uchiyama, S. Dussoni, A. D’Onofrio, T. Iwamoto, F. Renga, F. Sergiampietri, A. Graziosi, P.R. Kettle, G. Chiarello, Hajime Nishiguchi, M. Venturini, D. N. Grigoriev, Ryu Sawada, M. Nishimura, G. Signorelli, Fabrizio Cei, F. Tenchini, G. Cavoto, G. Piredda, Yu Bao, W. R. Molzon, Z. You, Michele Cascella, Roberto Pazzi, Tadayoshi Doke, P. W. Cattaneo, A. M. Baldini, M. Panareo, L. Galli, F. Raffaelli, Kayo Yoshida, Stefan Ritt, C. Cerri, K. Ieki, M. Simonetta, A. de Bari, Tomiyoshi Haruyama, D. Kaneko, and M. Rossella

Subjects
Physics, Particle physics, Antiparticle, Muon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Elementary particle, 01 natural sciences, Lepton number, Nuclear physics, Particle decay, Antimatter, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Lepton
Abstract

The final results of the search for the lepton flavour violating decay $$\mathrm {\mu }^+ \rightarrow \mathrm {e}^+ \mathrm {\gamma }$$ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013 and totalling $$7.5\times 10^{14}$$ stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected background and a new upper limit on the branching ratio of this decay of $$ \mathcal{B} (\mu ^+ \rightarrow \mathrm{e}^+ \gamma ) < 4.2 \times 10^{-13}$$ (90 % confidence level) is established, which represents the most stringent limit on the existence of this decay to date.

Published
2016

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

Author

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

Subjects
Phase difference, Physics, Quantum chromodynamics, Chiral symmetry, Particle physics, Chiral perturbation theory, Physics and Astronomy (miscellaneous), Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Lattice QCD, Low energy, High Energy Physics::Experiment, Engineering (miscellaneous), Energy (signal processing)
Abstract

We report results from the analysis of the \(\mbox {$\mathrm {K}^{\pm}$}\rightarrow \pi^{+} \pi^{-} \mathrm{e}^{\pm} \nu\) (\(\mbox {$\mathrm {K}_{\mathrm {e}4}$}\)) decay by the NA48/2 collaboration at the CERN SPS, based on the total statistics of 1.13 million decays collected in 2003–2004. The hadronic form factors in the S- and P-wave and their variation with energy are obtained. The phase difference between the S- and P-wave states of the ππ system is accurately measured and allows a precise determination of \(\mbox {$a_{0}^{0}$}\) and \(\mbox {$a_{0}^{2}$}\), the I = 0 and I = 2 S-wave ππ scattering lengths: \(\mbox {$a_{0}^{0}$}= 0.2220 \pm 0.0128 \mbox {$\mathrm {_{stat}}$}\pm 0.0050 \mbox {$\mathrm {_{syst}}$}\pm 0.0037\mbox {$\mathrm {_{th}}$},\mbox {$a_{0}^{2}$}= -0.0432 \pm 0.0086 \mbox {$\mathrm {_{stat}}$}\pm 0.0034 \mbox {$\mathrm {_{syst}}$}\pm 0.0028\mbox {$\mathrm {_{th}}$}\). Combination of this result with the other NA48/2 measurement obtained in the study of \(\mbox {$\mbox {$\mathrm {K}^{\pm}$}\rightarrow \mbox {$\pi ^{0}$}\mbox {$\pi ^{0}$}\mbox {$\scriptstyle \pi ^{\pm }$}$}\) decays brings an improved determination of \(\mbox {$a_{0}^{0}$}\) and the first precise experimental measurement of \(\mbox {$a_{0}^{2}$}\), providing a stringent test of Chiral Perturbation Theory predictions and lattice QCD calculations. Using constraints based on analyticity and chiral symmetry, even more precise values are obtained: \(\mbox {$a_{0}^{0}$}=0.2196 \pm 0.0028\mbox {$\mathrm {_{stat}}$}\pm 0.0020 \mbox {$\mathrm {_{syst}}$}\) and \(\mbox {$a_{0}^{2}$}= -0.0444 \pm 0.0007 \mbox {$\mathrm {_{stat}}$}\pm 0.0005 \mbox {$\mathrm {_{syst}}$}\pm 0.0008 \mbox {$\mathrm {_{ChPT}}$}\).

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5. New high statistics measurement of Ke4 decay form factors and ππ scattering phase shifts

Author

P. L. Frabetti, P. Marouelli, A. Michetti, P. Rubin, E. Iacopini, G. Marel, W. Baldini, B. Renk, Andrea Bizzeti, M. Holder, F. Marchetto, R. Fantechi, Milene Calvetti, Simone Bifani, H. Dibon, S. Balev, M. Martini, Mauro Raggi, Michael Ziolkowski, L. Widhalm, U. Moosbrugger, S. Stoynev, E. Marinova, J.B. Cheze, M. Veltri, Luca Fiorini, E. Monnier, G. Neuhofer, A. Maier, A. Norton, Roland Winston, Maulik R. Patel, P. F. Dalpiaz, Massimiliano Fiorini, H. D. Wahl, C. Morales Morales, D.C. Cundy, M. Fidecaro, Rainer Wanke, M. Pepe, G. Kalmus, A. Peters, Manfred Jeitler, S. Goy Lopez, B. Peyaud, G.M. Pierazzini, G. Ruggiero, V. Falaleev, Konrad Kleinknecht, I. Mannelli, N. A. Molokanova, G. Anzivino, M. Szleper, A. Gonidec, Cristina Biino, Ivan Mikulec, M. Scarpa, K. Eppard, D. Coward, Augusto Ceccucci, C. Cheshkov, A. J. Culling, E. C. Swallow, G. Collazuol, M. Valdata-Nappi, A. Cotta Ramusino, W. Kubischta, Evgueni Goudzovski, S. Giudici, D. J. Munday, A. Nappi, E. Imbergamo, B. Vallage, Peter Zahariev Hristov, Mayda Velasco, M. Sozzi, G. Lamanna, Fabrizio Petrucci, Lucia Masetti, S. A. Wotton, Vladimir Kekelidze, M. Slater, L. DiLella, Leander Litov, Enrico Celeghini, M. Wache, D. T. Madigozhin, A. Dabrowski, M. C. Petrucci, E. Mazzucato, Alan W. Walker, M. Markytan, M. Lenti, A. I. Zinchenko, A. Gianoli, Nicola Cabibbo, V. Kozhuharov, M. Savrie, B. Bloch-Devaux, M. De Beer, M. Behler, N. Doble, C. Damiani, Jacqueline Batley, I. Polenkevich, C. Cerri, M. D. Wood, G. Bocquet, Yu. Potrebenikov, F. Martelli, Nicolo Cartiglia, Cristina Lazzeroni, F. Costantini, M. Shieh, A. Winhart, T. Fonseca Martin, Mauro Piccini, Marco Clemencic, Lau Gatignon, P. Cenci, J. Derre, Roberta Arcidiacono, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and NA48

Subjects
DIRECT CP-VIOLATION, Particle physics, Chiral perturbation theory, Meson, Physics and Astronomy (miscellaneous), BEAM, 01 natural sciences, Nuclear physics, Particle decay, Effective mass (solid-state physics), Pion, teoria perturbativa chirale, SEARCH, 0103 physical sciences, EQUATION, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], decadimenti mesoni K, scattering lengths, Engineering (miscellaneous), 010306 general physics, mesons, Elastic scattering, Physics, mesoni K, decadimento Ke4, fattori di forma, pion pion scattering, PHOTOS MONTE-CARLO, KE4 DECAYS, Kaon decay, pions, 010308 nuclear & particles physics, 13.20.Eb, 13.75.Lb, Form factor (quantum field theory), Isospin, NA48, Particle Physics - Experiment
Abstract

We report results from a new measurement of the $K_{e4}$ decay $K^{\pm} \rightarrow \pi^{+}\pi^{-}e^{\pm}\nu$ by the NA48/2 collaboration at the CERN SPS, based on a partial sample of more than 670000 $K_{e4}$ decays in both charged modes collected in 2003. The form factors of the hadronic current (F, G, H) and $\pi\pi$ phase difference ($\delta=\delta_{s}-\delta_{p}$) have been measured in ten independent bins of the $\pi\pi$ mass spectrum to investigate the variation. A sizeable acceptance at large $\pi\pi$ mass, a low background and a very good resolution contribute to an improved experimental accuracy, a factor two better than in the previous measurement, when extracting the $\pi\pi$ scattering lengths $a^{0}_{0}$ and $a^{2}_{0}$. Under the assumption of isospin symmetry and using numerical solutions of the Roy equations, the following values are obtained in the plane ($a^{0}_{0}, a^{2}_{0}): a^{0}_{0}=0.233 \pm 0.016_{stat} \pm 0.007_{syst}, a^{2}_{0}=-0.0471 \pm 0.011_{stat} \pm 0.004_{syst}$. The presence of potentially large isospin effects is also considered and will allow comparison with precise predictions from Chiral Perturbation Theory.

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