A measurement of the parity-violating decay asymmetry parameter, ��b, and the helicity amplitudes for the decay ��b0���J/��(��+��-) ��0(p��-) is reported. The analysis is based on 1400 ��b0 and ����b0 baryons selected in 4.6fb-1 of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the ��b0 and ����b0 samples under the assumption of CP conservation, the value of ��b is measured to be 0.30��0.16(stat)��0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory. �� 2014 CERN, for the ATLAS Collaboration.
Measurement of the parity-violating asymmetry parameter ��b and the helicity amplitudes for the decay ��b0 ���J /�� ��0 with the ATLAS detector / Aad, G; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Conventi, Francesco; DELLA PIETRA, Massimo; Giordano, Raffaele; Rossi, Elvira; SANCHEZ PINEDA, ARTURO RODOLFO; Carlino, Gianpaolo; de Asmundis, Riccardo; Di Donato, Camilla; Doria, Alessandra; Iengo, Paolo; Izzo, Vincenzo; Sekhniaidze, Givi; Et, Al. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 89:092009(2014), pp. 1-25. [10.1103/PhysRevD.89.092009]
Measurement of the parity-violating asymmetry parameter ��b and the helicity amplitudes for the decay ��b0 ���J /�� ��0 with the ATLAS detector
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;CONVENTI, FRANCESCO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi, Elvira;SANCHEZ PINEDA, ARTURO RODOLFO;
2014
Abstract
A measurement of the parity-violating decay asymmetry parameter, ��b, and the helicity amplitudes for the decay ��b0���J/��(��+��-) ��0(p��-) is reported. The analysis is based on 1400 ��b0 and ����b0 baryons selected in 4.6fb-1 of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the ��b0 and ����b0 samples under the assumption of CP conservation, the value of ��b is measured to be 0.30��0.16(stat)��0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory. �� 2014 CERN, for the ATLAS Collaboration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
