/ Experiment-HEP hep-ex/0409053


Detection of pi+ pi- atoms with the DIRAC spectrometer at CERN


Adeva, B. ; Afanasyev, L. ; Benayoun, M. ; Benelli, A. ; Berka, Z. ; Brekhovskikh, V. ; Caragheorgheopol, G. ; Cechak, T. ; Chiba, M. ; Constantinescu, S. ; Costantini, S. ; Detraz, C. ; Dreossi, D. ; Drijard, D. ; Dudarev, A. ; Evangelou, I. ; Ferro-Luzzi, M. ; Gallas, M.V. ; Gerndt, J. ; Giacomich, R. ; Gianotti, P. ; Goldin, D. ; Gomez, F. ; Gorin, A. ; Gorchakov, O. ; Guaraldo, C. ; Hansroul, M. ; Hosek, R. ; Iliescu, M. ; Kalinina, N. ; Karpukhin, V. ; Kluson, J. ; Kobayashi, M. ; Kokkas, P. ; Komarov, V. ; Kruglov, V. ; Kruglova, L. ; Kulikov, A. ; Kuptsov, A. ; Kurochkin, I. ; Kuroda, K.-I. ; Lamberto, A. ; Lanaro, A. ; Lapshin, V. ; Lednicky, R. ; Leruste, P. ; Levi Sandri, P. ; Lopez Aguera, A. ; Lucherini, V. ; Maki, T. ; Manthos, N. ; Manuilov, I. ; Montanet, L. ; Narjoux, J.-L. ; Nemenov, L. ; Nikitin, M. ; Nunez Pardo, T. ; Okada, K. ; Olchevskii, V. ; Pazos, A. ; Pentia, M. ; Penzo, A. ; Perreau, J.-M. ; Petrascu, C. ; Plo, M. ; Ponta, T. ; Pop, D. ; Rappazzo, G.F. ; Rodriguez Fernandez, A. ; Romero, A. ; Ryazantsev, A. ; Rykalin, V. ; Santamarina, C. ; Saborido, J. ; Schacher, J. ; Schuetz, Ch.P. ; Sidorov, A. ; Smolik, J. ; Takeutchi, F. ; Tarasov, A. ; Tauscher, L. ; Tobar, M.J. ; Trusov, Sergey V. ; Utkin, V. ; Vazquez Doce, O. ; Vazquez, P. ; Vlachos, S. ; Yazkov, V. ; Yoshimura, Y. ; Zhabitsky, M. ; Zrelo, P.

Published in: J.Phys.G
Year: 2004
Vol.: G30
Page No: 1929-1946
Pages: 19

Abstract: The goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the $\pi^+\pi^-$ atom ($A_{2\pi}$), which is of order $3\times10^{-15}$ s, and thus to determine the s-wave $\pi\pi$-scattering lengths difference $|a_{0}-a_{2}|$. $A_{2\pi}$ atoms are detected through the characteristic features of $\pi^+\pi^-$ pairs from the atom break-up (ionization) in the target. We report on a first high statistics atomic data sample obtained from p Ni interactions at 24 GeV/$c$ proton momentum and present the methods to separate the signal from the background.

Web-Page: http://dx.doi.org/10.1088/0954-3899/30/12/012; http://www.iop.org/EJ/select?submit=1&cf_issn=0954-3899&cf_volume=30&cf_spage=1929

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