Determination of ππ scattering lengths from measurement of π+π− atom lifetime

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URI: https://hdl.handle.net/10347/45014
E-ISSN: 1873-2445
DOI: 10.1016/j.physletb.2011.08.074

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2011-09-03

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Elsevier
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Abstract

The DIRAC experiment at CERN has achieved a sizeable production of π π atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave ππ scattering length difference |a0−a2| = (0.2533+0.0080−0.0078|stat+0.0078−0.0073|syst)M_pi−^{1} has been attained, providing an important test of Chiral Perturbation Theory

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DIRAC experiment| Elementary atom| Pionium atom| Pion scattering

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B. Adeva, L. Afanasyev, M. Benayoun, A. Benelli, Z. Berka, V. Brekhovskikh, G. Caragheorgheopol, T. Cechak, M. Chiba, P.V. Chliapnikov, C. Ciocarlan, S. Constantinescu, S. Costantini, C. Curceanu (Petrascu), P. Doskarova, D. Dreossi, D. Drijard, A. Dudarev, M. Ferro-Luzzi, J.L. Fungueiriño Pazos, M. Gallas Torreira, J. Gerndt, P. Gianotti, D. Goldin, F. Gomez, A. Gorin, O. Gorchakov, C. Guaraldo, M. Gugiu, M. Hansroul, Z. Hons, R. Hosek, M. Iliescu, V. Karpukhin, J. Kluson, M. Kobayashi, P. Kokkas, V. Komarov, V. Kruglov, L. Kruglova, A. Kulikov, A. Kuptsov, K.I. Kuroda, A. Lamberto, A. Lanaro, V. Lapshin, R. Lednicky, P. Leruste, P. Levi Sandri, A. Lopez Aguera, V. Lucherini, T. Maki, I. Manuilov, J. Marin, J.L. Narjoux, L. Nemenov, M. Nikitin, T. Nunez Pardo, K. Okada, V. Olchevskii, A. Pazos, M. Pentia, A. Penzo, J.M. Perreau, M. Plo, T. Ponta, G.F. Rappazzo, A. Riazantsev, J.M. Rodriguez, A. Rodriguez Fernandez, A. Romero Vidal, V.M. Ronjin, V. Rykalin, J. Saborido, C. Santamarina, J. Schacher, C. Schuetz, A. Sidorov, J. Smolik, F. Takeutchi, A. Tarasov, L. Tauscher, M.J. Tobar, T. Trojek, S. Trusov, V. Utkin, O. Vázquez Doce, S. Vlachos, O. Voskresenskaya, T. Vrba, C. Willmott, V. Yazkov, Y. Yoshimura, M. Zhabitsky, P. Zrelov, Determination of ππ scattering lengths from measurement of π+π− atom lifetime, Physics Letters B, Volume 704, Issues 1–2, 2011, Pages 24-29, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2011.08.074

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We are indebted to CERN for continuous support and the PS team for the excellent performance of the accelerator. We acknowledge the computing help from CESGA (Spain). This work was funded by CERN, INFN (Italy), INCITE and MICINN (Spain), IFIN-HH (Romania), the Ministry of Education and Science and RFBR grant 01-02-17756-a (Russia), the Grant-in-Aid from JSPS and Sentanken-grant from Kyoto Sangyo University (Japan)

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© 2011 Elsevier B.V. This is an open access article distributed under the terms of the Creative Commons CC-BY license
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Física de Partículas
Cirurxía e Especialidades Médico-Cirúrxicas
Instituto Galego de Física de Altas Enerxías (IGFAE)