Dirac experiment

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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 th...

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Detalles Bibliográficos
Autores principales: Gómez, F, Adeva, B, Afanasev, L, Benayoun, M, Brekhovskikh, V, Caragheorgheopol, G, Cechák, T, Chiba, M, Constantinescu, S, Doudarev, A, Dreossi, D, Drijard, Daniel, Ferro-Luzzi, M, Gallas, M V, Gerndt, J, Giacomich, R, Gianotti, P, Goldin, D, Gorin, A, Gortchakov, O, Guaraldo, C, Hansroul, M, 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, Narjoux, J L, Nemenov, L, Nikitin, M, Nunez Pardo, T, Okada, K, Olchevskii, V, Pazos, A, Pentia, M, Penzo, Aldo L, Perreau, J M, 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
Lenguaje:eng
Publicado: 2001
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1016/S0920-5632(01)01139-2
http://cds.cern.ch/record/615753
Descripción
Sumario: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).

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