Upgraded DIRAC Spectrometer at CERN PS for the Investigation of Ππ and Πk Atoms

B. Adeva,L. Afanasyev,Y. Allkofer, C. Amsler,A. Anania,S. Aogaki,A. Benelli,V. Brekhovskikh,Gh. Caragheorgheopol,T. Cechak,M. Chiba,P. Chliapnikov,C. Ciocarlan, S. Constantinescu,C. Detraz,P. Doskarova,D. Drijard,A. Dudarev,M. Duma,D. Dumitriu, D. Fluerasu, A. Gorin, O. Gorchakov, K. Gritsay, C. Guaraldo, M. Gugiu, M. Hansroul, Z. Hons, S. Horikawa, Y. Iwashita, V. Karpukhin, J. Kluson, M. Kobayashi, V. Kruglov, L. Kruglova, A. Kulikov, E. Kulish, A. Kuptsov, A. Lamberto, A. Lanaro, R. Lednicky, C. Marinas, J. Martincik, L. Nemenov, M. Nikitin, K. Okada, V. Olchevskii, M. Pentia, A. Penzo, M. Plo, P. Prusa, G. F. Rappazzo, A. Romero Vidal, A. Ryazantsev, V. Rykalin, J. Saborido, J. Schacher, A. Sidorov, J. Smolik, F. Takeutchi, L. Tauscher, T. Trojek, S. Trusov, O. Ullaland, T. Urban, T. Vrba, V. Yazkov, Y. Yoshimura, M. Zhabitsky, P. Zrelov

Nuclear instruments and methods in physics research Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research Section A, Accelerators, spectrometers, detectors and associated equipment（2016）

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摘要

The DIRAC spectrometer installed at CERN PS was upgraded in order to study simultaneously A(2 pi) and A(pi K) atoms, namely the bound states of two pi mesons, and of pi and K mesons, respectively. The detector system can now accept a high intensity beam of 2-6 x 10(11) primary protons per second. The electronics and the data-acquisition system can handle a very large amount of data to identify pi, K, p, e and mu, allowing the selection of pi pi and pi K pairs in the offline analysis. The resolution of the longitudinal and transverse components of the relative momentum Q of each meson pair in their center-of-mass system with respect to the direction of the pair was substantially improved. The analysis of their distributions allowed an reliable separation between the meson pairs originating from hadronic atoms and the backgrounds permitting the measurement of the lifetimes of hadronic atoms in the ground state and pi-pi, pi-K s-wave scattering lengths. The upgraded setup also allowed the study of the long-lived excited states of pi pi atoms. (C) 2016 Elsevier B.V. All rights reserved.

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关键词

Upgraded DIRAC spectrometer,CERN PS,pi pi and pi K atoms,Life-time measurement,Long-lived excited states of pi pi atoms

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