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Aaij, R.; Amhis, Y.; Barsuk, S.; Fleuret, F.; Kochebina, O.; Lefrançois, J.; Li, Y.; Machefert, F.; Manca, G.; Massacrier, L.M.; Quagliani, R.; Renaudin, V.; Robbe, P.; Schune, M.-H.; Vallier, A.; Viaud, B.; Wormser, G.; Beaucourt, L.; Chefdeville, M.; Decamp, D.; Déléage, N.; Ghez, P.; Lees, J.P.; Marchand, J.F.; Minard, M.N.; Pietrzyk, B.; Qian, W.; t'Jampens, S.; Tisserand, V.; Tournefier, E.; Akar, S.; Aslanides, E.; Cogan, J.; Kanso, W.; Legac, R.; Leroy, O.; Mancinelli, G.; Martin, M.; Mordà, A.; Serrano, J.; Tayduganov, A.; Tsaregorodtsev, A.; Ajaltouni, Z.J.; Baalouch, M.; Cogneras, E.; Deschamps, O.; El Rifai, I.; Gazzoni, G.; Grabalosa Gándara, M.; Henrard, Pierre; Hoballah, M.; Kozeiha, M.; Lefèvre, R.; Maratas, J.; Monteil, S.; Niess, V.; Perret, P.
The journal of high energy physics, 03/2016, Letnik: 3Journal Article
The $B_s^0 \rightarrow J/\psi \phi \phi$ decay is observed in $pp$ collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ recorded by the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. The mass of the $B_s^0$ meson is measured to be $5367.08\,\pm \,0.38\,\pm\, 0.15$ MeV/c$^2$. The branching fraction ratio $\mathcal{B}(B_s^0 \rightarrow J/\psi \phi \phi)/\mathcal{B}(B_s^0 \rightarrow J/\psi \phi)$ is measured to be $0.0115\,\pm\, 0.0012\, ^{+0.0005}_{-0.0009}$. In both cases, the first uncertainty is statistical and the second is systematic. No evidence for non-resonant $B_s^0 \rightarrow J/\psi \phi K^+ K^-$ or $B_s^0 \rightarrow J/\psi K^+ K^- K^+ K^-$ decays is found.
