Study of η−η′ mixing from measurement of B0(s)→J/ψη(′)~decay rates

A study of $B^0$~and $B^0_s$ meson decays into $J/\psi\eta$~and $J/\psi\eta^{\prime}$ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8TeV, collected by the LHCb experiment and corresponding to 3.0fb$^{-1}$ of integrated luminosity. The deca...

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Bibliographic Details
Published in:The journal of high energy physics 2015, Vol.2015 (1)
Main Authors: Aaij, R., Beaucourt, L., Chefdeville, M., Decamp, D., Déléage, N., Ghez, Ph, Lees, J.-P., Marchand, J.F., Minard, M.-N., Pietrzyk, B., Qian, W., t'Jampens, S., Tisserand, V., Tournefier, E., Amhis, Y., Barsuk, S., Borsato, M., Kochebina, O., Lefrançois, J., Machefert, F., Sanchez, A. Martin, Nicol, M., Robbe, P., Schune, M.-H., Teklishyn, M., Vallier, A., Viaud, B., Akar, S., Aslanides, E., Cogan, J., Kanso, W., Legac, R., Leroy, O., Mancinelli, G., Mordà, A., Perrin-Terrin, M., Serrano, J., Tsaregorodtsev, A., Ajaltouni, Ziad Zj, Baalouch, M., Cogneras, E., Deschamps, O., El Rifai, I., Gazzoni, G., Grabalosa Gándara, M., Henrard, Pierre, Hoballah, M., Lefèvre, R., Maratas, J., Monteil, S., Niess, V., Perret, P.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:A study of $B^0$~and $B^0_s$ meson decays into $J/\psi\eta$~and $J/\psi\eta^{\prime}$ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8TeV, collected by the LHCb experiment and corresponding to 3.0fb$^{-1}$ of integrated luminosity. The decay $B^0 \rightarrow J/\psi \eta^{\prime}$ is observed for thefirst time. The following ratios of branching fractions are measured: $$ \frac{\mathcal{B}(B^0 \rightarrow J/\psi \eta^{\prime})}{\mathcal{B}(B^0_s \rightarrow J/\psi \eta^{\prime})} = (2.28\pm0.65\,(stat)\,\pm0.10\,(syst)\,\pm0.13\,(f_{s}/f_{d}))\times10^{-2},$$ $$ \frac{\mathcal{B}(B^0 \rightarrow J/\psi \eta)}{\mathcal{B}(B^0_s \rightarrow J/\psi \eta)} = (1.85\pm0.61\,(stat)\,\pm0.09\,(syst)\,\pm0.11\,(f_{s}/f_{d}))\times10^{-2},$$ where the third uncertainty is related to the present knowledge of $f_{s}/f_{d}$, the ratio between the probabilities for a $b$ quark to form a $B^0_s$ or $B^0$ meson. The branching fraction ratios are used to determine the parameters of $\eta-\eta^{\prime}$ meson mixing. In addition, the first evidence for the decay $B^0_s \rightarrow \psi(2S) \eta^{\prime}$ is reported, and the relative branching fraction is measured,$$\frac{\mathcal{B}(B^0_s \rightarrow \psi(2S) \eta^{\prime})}{\mathcal{B}(B^0_s \rightarrow J/\psi \eta^{\prime})} = (38.7\pm9.0\,(stat)\,\pm1.3\,(syst)\,\pm0.9(\mathcal{B}))\times10^{-2},$$where the third uncertainty is due to the limited knowledge of the branching fractions of $J/\psi$ and $\psi(2S)$~mesons.
ISSN:1126-6708
1029-8479
DOI:10.1007/JHEP01(2015)024