| HAL : in2p3-00741297, version 1 |
| arXiv : 1210.2631 |
| DOI : 10.1016/j.nuclphysb.2012.10.021 |
| Fiche détaillée | Récupérer au format |
|
|
| Nuclear Physics B 867 (2013) 547-566 |
|
|
|
|
| Evidence for the decay $B^0\to J/\psi \omega$ and measurement of the relative branching fractions of $B^0_s$ meson decays to $J/\psi\eta$ and $J/\psi\eta^{'}$ |
|
|
|
|
| LHCb Collaboration(s) |
|
|
| (2013) |
|
|
| First evidence of the $B^0\to J/\psi\omega$ decay is found and the $B_{s}^0\to J/\psi\eta$ and $B_{s}^0\to J/\psi\eta^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV. The branching fractions of these decays are measured relative to that of the $\mathrm{B}^0\to J/\psi\rho^0$ decay: $$\frac{Br(B^0\to J/\psi\omega)}{Br(B^0\to J/\psi\rho^0)} = 0.89 \pm0.19(stat)^{+0.07}_{-0.13}(syst)$$ $$\frac{Br(B^0_s\to J/\psi\eta)}{Br(B^0\to J/\psi\rho^0)} = 14.0 \pm 1.2(stat)^{+1.1}_{-1.5}(syst)^{+1.1}_{-1.0}(\frac{f_d}{f_s}),$$ $$\frac{Br(B^0_s\to J/\psi\eta^{\prime})}{Br(B^0\to J/\psi\rho^0)} = 12.7\pm1.1(stat)^{+0.5}_{-1.3}(syst)^{+1.0}_{-0.9}(\frac{f_d}{f_s}),$$ where the last uncertainty is due to the knowledge of $f_d/f_s$, the ratio of b-quark hadronization factors that accounts for the different production rate of $B^0$ and $B^0_s$ mesons. The ratio of the branching fractions of $B^0_s\to J/\psi\eta^{\prime}$ and $B^0_s\to J/\psi\eta$ decays is measured to be $$ \frac{Br(B^0_s\to J/\psi\eta^{\prime})}{Br(B^0_s\to J/\psi\eta)} = 0.90\pm0.09(stat)^{+0.06}_{-0.02}(syst).$$ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Thème(s) | : | Physique/Physique des Hautes Energies - Expérience |
|
|
| Lien vers le texte intégral : |
| in2p3-00741297, version 1 | |
| http://hal.in2p3.fr/in2p3-00741297 | |
| oai:hal.in2p3.fr:in2p3-00741297 | |
| Contributeur : Françoise Marechal | |
| Soumis le : Vendredi 12 Octobre 2012, 11:50:06 | |
| Dernière modification le : Mardi 18 Décembre 2012, 12:01:31 | |