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Your search keyword '"P. L. Frabetti"' showing total 2 results
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2 results on '"P. L. Frabetti"'

1. 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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2. 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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