First measurement of the pi+pi- atom lifetime
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ISSN: 0370-2693
E-ISSN: 1873-2445
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Abstract
The goal of the DIRAC experiment at CERN (PS212) is to measure the π+π− atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the S-wave ππ scattering lengths combination |a0 − a2|. Based on part of the collected data we present a first result on the lifetime, τ = [2.91+0.49 −0.62] × 10−15 s, and discuss the major systematic errors. This lifetime corresponds to |a0 − a2| = 0.264+0.033 −0.020m−1 π .
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B. Adeva, L. Afanasyev, M. Benayoun, A. Benelli, Z. Berka, V. Brekhovskikh, G. Caragheorgheopol, T. Cechak, M. Chiba, S. Constantinescu, C. Detraz, D. Dreossi, D. Drijard, A. Dudarev, I. Evangelou, M. Ferro-Luzzi, M.V. Gallas, J. Gerndt, R. Giacomich, P. Gianotti, D. Goldin, F. Gómez, A. Gorin, O. Gorchakov, C. Guaraldo, M. Hansroul, R. Hosek, M. Iliescu, V. Karpukhin, J. Kluson, M. Kobayashi, P. Kokkas, V. Komarov, V. Kruglov, L. Kruglova, A. Kulikov, A. Kuptsov, I. Kurochkin, K.-I. Kuroda, A. Lamberto, A. Lanaro, V. Lapshin, R. Lednicky, P. Leruste, P. Levi Sandri, A. Lopez Aguera, V. Lucherini, T. Maki, N. Manthos, I. Manuilov, L. Montanet, J.-L. Narjoux, L. Nemenov, M. Nikitin, T. Núñez Pardo, K. Okada, V. Olchevskii, A. Pazos, M. Pentia, A. Penzo, J.-M. Perreau, C. Petrascu, M. Pló, T. Ponta, D. Pop, G.F. Rappazzo, A. Rodriguez Fernandez, A. Romero, A. Ryazantsev, V. Rykalin, C. Santamarina, J. Saborido, J. Schacher, Ch.P. Schuetz, A. Sidorov, J. Smolik, F. Takeutchi, A. Tarasov, L. Tauscher, M.J. Tobar, S. Trusov, V. Utkin, O. Vázquez Doce, P. Vázquez, S. Vlachos, V. Yazkov, Y. Yoshimura, M. Zhabitsky, P. Zrelov, First measurement of the π+π− atom lifetime, Physics Letters B, Volume 619, Issues 1–2, 2005, Pages 50-60, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2005.05.045.
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