Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms
| Autor: | K. Gritsay, A.V. Kuptsov, Carlos Marinas, V. Kruglov, A. Ryazantsev, Masaaki Kobayashi, Y. Yoshimura, A. Sidorov, V.I. Rykalin, P. Chliapnikov, Bernardo Adeva, Tomáš Trojek, D. Fluerasu, Claude Amsler, P. Prusa, A. Anania, A. I. Kulikov, J. Smolik, Yoshihisa Iwashita, M. Plo, M. Nikitin, P. Doskarova, S. Constantinescu, M. Gugiu, J. Saborido, J. Martincik, M. Hansroul, L. Afanasyev, G. Caragheorgheopol, M. Pentia, R. Lednicky, L. Nemenov, Armando Lanaro, J. Schacher, O.E. Gorchakov, A. Penzo, L. Kruglova, Z. Hons, Y. Allkofer, A. Romero Vidal, O. Ullaland, C. Ciocarlan, L. Tauscher, V. Karpukhin, T. Vrba, Masami Chiba, D. Dumitriu, M. Duma, M. Zhabitsky, V. Brekhovskikh, C. Guaraldo, T. Urban, A. Lamberto, V. Olchevskii, S.V. Trusov, S. Horikawa, Tomáš Čechák, S. Aogaki, A. Benelli, C. Detraz, E. Kulish, D. Drijard, A. Gorin, Fujio Takeutchi, V. Yazkov, J. Kluson, P. Zrelov, K. Okada, A. Dudarev, G.F. Rappazzo |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear and High Energy Physics Spectrometer Meson 010308 nuclear & particles physics Hadron Dirac (software) 01 natural sciences Particle identification Nuclear physics Excited state 0103 physical sciences Atom High Energy Physics::Experiment Atomic physics Nuclear Experiment 010306 general physics Ground state Instrumentation Particle Physics - Experiment |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 839:52-85 |
| ISSN: | 0168-9002 |
| Popis: | The DIRAC spectrometer installed at CERN PS was upgraded in order to study simultaneously A2π and AπK atoms, namely the bound states of two π mesons, and of π and K mesons, respectively. The detector system can now accept a high intensity beam of 2–6×1011 primary protons per second. The electronics and the data-acquisition system can handle a very large amount of data to identify π, K, p, e and µ, allowing the selection of ππ and πK 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 π–π, π–K s-wave scattering lengths. The upgraded setup also allowed the study of the long-lived excited states of ππ atoms. |
| Databáze: | OpenAIRE |
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