학술논문
Determination of $\pi\pi$ scattering lengths from measurement of $\pi^+\pi^-$ atom lifetime
Document Type
Working Paper
Author
Adeva, B.; Afanasyev, L.; Benayoun, M.; Benelli, A.; Berka, Z.; Brekhovskikh, V.; Caragheorgheopol, G.; Cechak, T.; Chiba, M.; Chliapnikov, P. V.; Ciocarlan, C.; Constantinescu, S.; Costantini, S.; Curceanu, C.; Doskarova, P.; Dreossi, D.; Drijard, D.; Dudarev, A.; Ferro-Luzzi, M.; Pazos, J. L. Fungueiriño; Torreira, M. Gallas; Gerndt, J.; Gianotti, P.; Goldin, D.; Gomez, F.; Gorin, A.; Gorchakov, O.; Guaraldo, C.; Gugiu, M.; Hansroul, M.; Hons, Z.; Hosek, R.; Iliescu, M.; Karpukhin, V.; Kluson, J.; Kobayashi, M.; Kokkas, P.; Komarov, V.; Kruglov, V.; Kruglova, L.; Kulikov, A.; Kuptsov, A.; Kuroda, K. I.; Lamberto, A.; Lanaro, A.; Lapshin, V.; Lednicky, R.; Leruste, P.; Sandri, P. Levi; Aguera, A. Lopez; Lucherini, V.; Maki, T.; Manuilov, I.; Marin, J.; Narjoux, J. L.; Nemenov, L.; Nikitin, M.; Pardo, T. Nunez; Okada, K.; Olchevskii, V.; Pazos, A.; Pentia, M.; Penzo, A.; Perreau, J. M.; Plo, M.; Ponta, T.; Rappazzo, G. F.; Riazantsev, A.; Rodriguez, J. M.; Fernandez, A. Rodriguez; Vidal, A. Romero; Ronjin, V. M.; Rykalin, V.; Saborido, J.; Santamarina, C.; Schacher, J.; Schuetz, C.; Sidorov, A.; Smolik, J.; Takeutchi, F.; Tarasov, A.; Tauscher, L.; Tobar, M. J.; Trojek, T.; Trusov, S.; Utkin, V.; Doce, O. Vázquez; Vlachos, S.; Voskresenskaya, O.; Vrba, T.; Willmott, C.; Yazkov, V.; Yoshimura, Y.; Zhabitsky, M.; Zrelov, P.
Source
Physics Letters B 704 (2011) 24
Subject
Language
Abstract
The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ 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 $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory.
Comment: 6 pages, 6 figures
Comment: 6 pages, 6 figures