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Aaij, R.; Beaucourt, L.; Chefdeville, M.; Decamp, D.; Déléage, N.; Ghez, P.; Lees, J.-P.; Marchand, J.-F.; Minard, M.-N.; Pietrzyk, B.; t'Jampens, S.; Tisserand, V.; Tournefier, E.; Ajaltouni, Z.J.; Baalouch, M.; Cogneras, E.; Deschamps, O.; Gazzoni, G.; Gándara, M. Grabalosa; Hadjivasiliou, C.; Henrard, P.; Kozeiha, M.; Lefèvre, R.; Maratas, J.; Monteil, S.; Perret, P.; Vernet, M.; Akar, S.; Romeu, J. Arnau; Aslanides, E.; Cogan, J.; Bruyn, K. De; Kanso, W.; Legac, R.; Leroy, O.; Mancinelli, G.; Martin, M.; Mordà, A.; Serrano, J.; Tayduganov, A.; Tsaregorodtsev, A.
Physics letters. B, 11/2016, Letnik: 762Journal Article
Using a data set corresponding to an integrated luminosity of 3fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the B0s→J/ψη decay mode, τeff, is measured to be τeff=1.479±0.034 (stat)±0.011 (syst) ps. Assuming CP conservation, τeff corresponds to the lifetime of the light B0s mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.
