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| Article | |
| Report number | DIRAC-CONF-2000-04 |
| Title | Dirac experiment |
| Author(s) |
Gómez, F ; Adeva, B ; Afanasev, L ; Benayoun, M ; Brekhovskikh, V ; Caragheorgheopol, G ; Cechák, T ; Chiba, M ; Constantinescu, S ; Doudarev, A ; Dreossi, D ; Drijard, Daniel (CERN) ; Ferro-Luzzi, M (CERN) ; Gallas, M V (CERN) ; Gerndt, J ; Giacomich, R ; Gianotti, P ; Goldin, D ; Gorin, A ; Gortchakov, O ; Guaraldo, C ; Hansroul, M (CERN) ; Hosek, R ; Iliescu, M ; Jabitski, M ; Kalinina, N ; Karpoukhine, V ; Kluson, J ; Kobayshi, M ; Kokkas, P ; Komarov, V ; Koulikov, A ; Kouptsov, A ; Krouglov, V ; Krouglova, L ; Kuroda, K I ; Lanaro, A ; Lapshine, B ; Lednicky, R ; Leruste, P ; Levisandri, P ; López-Aguera, A ; Lucherini, V ; Mäki, T ; Manuilov, I ; Montanet, L (CERN) ; Narjoux, J L ; Nemenov, L (CERN) ; Nikitin, M ; Nunez Pardo, T ; Okada, K ; Olchevskii, V ; Pazos, A ; Pentia, M ; Penzo, Aldo L ; Perreau, J M (CERN) ; Petrascu, C ; Pló, M ; Ponta, T ; Pop, D ; Riazantsev, A ; Rodríguez, J M ; Rodriguez Fernandez, A ; Rykaline, V ; Santamarina, C ; Saborido, J ; Schacher, J ; Sidorov, A ; Smolik, J ; Takeutchi, F ; Tarasov, A ; Tauscher, L ; Tobar, M J ; Trusov, S ; Vasquez, P ; Vlachos, S ; Yazkov, V ; Yoshimura, Y ; Zrelov, P |
| Publication | 2001 |
| Imprint | 2001 |
| In: | Nucl. Phys. B, Proc. Suppl. 96 (2001) 259-266 |
| In: | 8th International Euroconference on Quantum Chromodynamics, Montpellier, France, 6 - 13 Jul 2000, pp.259-266 |
| DOI | 10.1016/S0920-5632(01)01139-2 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN PS ; DIRAC PS212 |
| Abstract | The main objective of DIRAC experiment is the measurement of the lifetime tau of the exotic hadronic atom consisting of pi /sup +/ and pi /sup -/ mesons. The lifetime of this atom is determined by the decay mode pi /sup +/ pi /sup -/ to pi /sup 0/ pi /sup 0/ due to the strong interaction. Through the precise relationship between the lifetime and the S-wave pion-pion scattering length difference a/sub 0/-a/sub 2/ for isospin 0 and 2 (respectively), a measurement of tau with an accuracy of 10% will allow a determination of a/sub 0/-a/sub 2/at a 5% precision level. Pion-pion scattering lengths have been calculated in the framework of chiral perturbation theory with an accuracy below 5%. In this way DIRAC experiment will provide a crucial test of the chiral symmetry breaking scheme in QCD effective theories at low energies. (19 refs). |