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, A., Alviggi, M., Canale, V., Chiefari, G., DELLA VOLPE, D., Merola, L., Conventi, F., DELLA PIETRA, M., Giordano, R., Rossi, E., SANCHEZ PINEDA, A.R., Carlino, G., de Asmundis, R., Di Donato, C., Doria, A., Iengo, P., Izzo, V., Sekhniaidze, G., Et, A.l.. - 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.
