B Adeva et al 2004 J. Phys. G: Nucl. Part. Phys. 30 1929 doi:10.1088/0954-3899/30/12/012
B Adeva1, L Afanasyev2, M Benayoun3, A Benelli4, Z Berka5, V Brekhovskikh6, G Caragheorgheopol7, T Cechak5, M Chiba8, S Constantinescu7, S Costantini4, C Detraz9, D Dreossi10, D Drijard9, A Dudarev2, I Evangelou11, M Ferro-Luzzi9, M V Gallas1,9, J Gerndt5, R Giacomich10, P Gianotti12, D Goldin4, F Gómez1, A Gorin6, O Gorchakov2, C Guaraldo12, M Hansroul9, R Hosek5, M Iliescu12,7, N Kalinina13, V Karpukhin2, J Kluson5, M Kobayashi14, P Kokkas11, V Komarov2, V Kruglov2, L Kruglova2, A Kulikov2, A Kuptsov2, I Kurochkin6, K-I Kuroda2, A Lamberto10, A Lanaro9,12, V Lapshin6, R Lednicky15, P Leruste3, P Levi Sandri12, A Lopez Aguera1, V Lucherini12, T Maki16, N Manthos11, I Manuilov6, L Montanet9,19, J-L Narjoux3, L Nemenov9,2, M Nikitin2, T Núñez Pardo1, K Okada17, V Olchevskii2, A Pazos1, M Pentia7, A Penzo10, J-M Perreau9, C Petrascu12,7, M Pló1, T Ponta7, D Pop7, G F Rappazzo10, A Rodriguez Fernandez1, A Romero1, A Ryazantsev6, V Rykalin6, C Santamarina1,18, J Saborido1, J Schacher18, Ch P Schuetz4, A Sidorov6, J Smolik15, F Takeutchi17, A Tarasov2, L Tauscher4, M J Tobar1, S Trusov13, V Utkin2, O Vázquez Doce1, P Vázquez1, S Vlachos4, V Yazkov13, Y Yoshimura14, M Zhabitsky2 and P Zrelov2
Show affiliationsThe goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the π+π− atom (A2π), which is of order 3 × 10−15 s, and thus to determine the s-wave ππ-scattering lengths difference |a0 − a2|. A2π atoms are detected through the characteristic features of π+π− 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.
36.10.Gv Mesonic, hyperonic and antiprotonic atoms and molecules
25.40.Ep Inelastic proton scattering
27.40.+z 39(less-than-or-equal-to)A(less-than-or-equal-to)58
Issue 12 (December 2004)
Received 22 September 2004
Published 2 November 2004
B Adeva et al 2004 J. Phys. G: Nucl. Part. Phys. 30 1929
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