Publicação
Time-dependent angular analysis of the decay $B_{s}^{0} \to J/{\psi\phi}$ and extraction of $\Delta\Gamma_{s}$ and the CP-violating weak phase $\phi_s$ by ATLAS
| dc.contributor.author | ATLAS collaboration (2889 authors) | |
| dc.contributor.author | Aguilar-Saavedra, Juan Antonio | |
| dc.contributor.author | Anjos, Nuno | |
| dc.contributor.author | Cantrill, Robert | |
| dc.contributor.author | Carvalho, João | |
| dc.contributor.author | Castro, Nuno Filipe | |
| dc.contributor.author | Conde Muiño, Patricia | |
| dc.contributor.author | Da Cunha Sargedas De Sousa, Mario Jose | |
| dc.contributor.author | Do Valle Wemans, André | |
| dc.contributor.author | Fiolhais, Miguel | |
| dc.contributor.author | Gomes, Agostinho | |
| dc.contributor.author | Gonçalo, Ricardo | |
| dc.contributor.author | Jorge, Pedro | |
| dc.contributor.author | Lopes, Lourenco | |
| dc.contributor.author | Machado Miguens, Joana | |
| dc.contributor.author | Maio, Amélia | |
| dc.contributor.author | Maneira, José | |
| dc.contributor.author | Oliveira, Miguel Alfonso | |
| dc.contributor.author | Onofre, António | |
| dc.contributor.author | Palma, Alberto | |
| dc.contributor.author | Pina, João Antonio | |
| dc.contributor.author | Pinto, Belmiro | |
| dc.contributor.author | Santos, Helena | |
| dc.contributor.author | Saraiva, João | |
| dc.contributor.author | Silva, José | |
| dc.contributor.author | Veloso, Filipe | |
| dc.contributor.author | Wolters, Helmut | |
| dc.date.accessioned | 2019-02-03T20:40:28Z | |
| dc.date.available | 2019-02-03T20:40:28Z | |
| dc.date.issued | 2012-08 | |
| dc.date.updated | 2019-02-03T20:40:28Z | |
| dc.description.abstract | A measurement of Bs J/psi phi decay parameters, including the CP-violating weak phase phi_s and the decay width difference Delta Gamma_s is reported, using 4.9 fb-1 of integrated luminosity collected in 2011 by the ATLAS detector from LHC pp collisions at a centre- of-mass energy sqrt(s) = 7 TeV. The mean decay width Gamma_s and the transversity amplitudes |A0(0)|^2 and |A||(0)|^2 are also measured. The values reported for these parameters are: phi_s = 0.22 \pm 0.41 (stat.) \pm 0.10 (syst.) rad Delta Gamma_s = 0.053 \pm 0.021 (stat.) \pm 0.010 (syst.) ps-1 Gamma_s = 0.677 \pm 0.007 (stat.) \pm 0.004 (syst.) ps-1 |A0(0)|^2 = 0.528 \pm 0.006 (stat.) \pm 0.009 (syst.) |A||(0)|^2 = 0.220 \pm 0.008 (stat.) \pm 0.007 (syst.) where the values quoted for phi_s and Delta Gamma_s correspond to the solution compatible with the external measurements to which the strong phase delta perpendicular is constrained and where Delta Gamma_s is constrained to be positive. The fraction of S-wave KK or f0 contamination through the decays Bs -> J/psi K+K-(f0) is measured as well and is found to be consistent with zero. Results for phi_s and Delta Gamma_s are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | JHEP 1212 (2012) 072; DOI 10.1007/JHEP12(2012)072 | |
| dc.identifier.uri | http://dx.doi.org/10.1007/JHEP12(2012)072 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26237 | |
| dc.language.iso | eng | |
| dc.title | Time-dependent angular analysis of the decay $B_{s}^{0} \to J/{\psi\phi}$ and extraction of $\Delta\Gamma_{s}$ and the CP-violating weak phase $\phi_s$ by ATLAS | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |