Determination of $\pi\pi$ scattering lengths from measurement of $\pi^+\pi^-$ atom lifetime

Determination of $\pi\pi$ scattering lengths from measurement of $\pi^+\pi^-$ atom lifetime

Physics Letters B 704 (2011) 24 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...

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Hauptverfasser: 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
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Sprache:eng
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Physics - High Energy Physics - Experiment
Physics - High Energy Physics - Phenomenology
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Zusammenfassung:Physics Letters B 704 (2011) 24 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.
DOI:10.48550/arxiv.1109.0569