Detection of π+π− atoms with the DIRAC spectrometer at CERN

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

doi:10.1088/0954-3899/30/12/012

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Journal of Physics G: Nuclear and Particle Physics

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B Adeva et al 2004 J. Phys. G: Nucl. Part. Phys. 30 1929 doi:10.1088/0954-3899/30/12/012

Detection of π⁺π⁻ atoms with the DIRAC spectrometer at CERN

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 Gallas^1,9, J Gerndt⁵, R Giacomich¹⁰, P Gianotti¹², D Goldin⁴, F Gómez¹, A Gorin⁶, O Gorchakov², C Guaraldo¹², M Hansroul⁹, R Hosek⁵, M Iliescu^12,7, 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 Lanaro^9,12, V Lapshin⁶, R Lednicky¹⁵, P Leruste³, P Levi Sandri¹², A Lopez Aguera¹, V Lucherini¹², T Maki¹⁶, N Manthos¹¹, I Manuilov⁶, L Montanet^9,19, J-L Narjoux³, L Nemenov^9,2, M Nikitin², T Núñez Pardo¹, K Okada¹⁷, V Olchevskii², A Pazos¹, M Pentia⁷, A Penzo¹⁰, J-M Perreau⁹, C Petrascu^12,7, M Pló¹, T Ponta⁷, D Pop⁷, G F Rappazzo¹⁰, A Rodriguez Fernandez¹, A Romero¹, A Ryazantsev⁶, V Rykalin⁶, C Santamarina^1,18, 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

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Leonid.Afanasev@cern.ch

¹ Santiago de Compostela University, Spain
² JINR Dubna, Russia
³ LPNHE des Universites Paris VI/VII, IN2P3-CNRS, France
⁴ Basel University, Switzerland
⁵ Czech Technical University, Prague, Czech Republic
⁶ IHEP Protvino, Russia
⁷ IFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, Romania
⁸ Tokyo Metropolitan University, Japan
⁹ CERN, Geneva, Switzerland
¹⁰ INFN, Trieste and Trieste University, Trieste, Italy
¹¹ Ioannina University, Ioannina, Greece
¹² INFN, Laboratori Nazionali di Frascati, Frascati, Italy
¹³ Skobeltsin Institute for Nuclear Physics, Moscow State University, Moscow, Russia
¹⁴ KEK, Tsukuba, Japan
¹⁵ Institute of Physics ACSR, Prague, Czech Republic
¹⁶ UOEH-Kyushu, Japan
¹⁷ Kyoto Sangyo University, Kyoto, Japan
¹⁸ Bern University, Switzerland
¹⁹ Deceased

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Abstract References Cited By

The goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the π⁺π⁻ atom (A_2π), which is of order 3 × 10⁻¹⁵ s, and thus to determine the s-wave ππ-scattering lengths difference |a₀ − a₂|. A_2π 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.

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Detection of π+π− atoms with the DIRAC spectrometer at CERN

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Detection of π⁺π⁻ atoms with the DIRAC spectrometer at CERN