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arxiv: 1109.0569 · v2 · pith:2YXKIIEL · submitted 2011-09-02 · hep-ex · hep-ph

Determination of ππ scattering lengths from measurement of π^+π^- atom lifetime

B. Adeva , L. Afanasyev , M. Benayoun , A. Benelli , Z. Berka , V. Brekhovskikh , G. Caragheorgheopol , T. Cechak
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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. Fungueiri\~no 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. V\'azquez Doce S. Vlachos O. Voskresenskaya T. Vrba C. Willmott V. Yazkov Y. Yoshimura M. Zhabitsky P. Zrelov
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classification hep-ex hep-ph
keywords determinationlifetimemathrmmeasurementscatteringachievedatomatomic
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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.

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