RT Journal Article T1 Measurement of the B0s→J/ψη lifetime A1 LHCb Collaboration, A1 Adeva Andany, Bernardo A1 Borsato, Martino A1 Chobanova, Veronika A1 Cid Vidal, Xabier A1 Dosil Suárez, Álvaro A1 Fernández Albor, Víctor Manuel A1 Gallas Torreira, Abraham Antonio A1 García Pardiñas, Julián A1 Hernando Morata, José Ángel A1 Lemos Cid, Edgar A1 Lucio Martínez, Miriam A1 Martínez Santos, Diego A1 Plo Casasus, Máximo A1 Prisciandaro, Jessica A1 Ramos Pernas, Miguel A1 Romero Vidal, Antonio A1 Saborido Silva, Juan José A1 Sanmartín Sedes, Brais A1 Santamarina Ríos, Cibrán A1 Vázquez Regueiro, Pablo A1 Vieites Díaz, María A1 Vázquez Sierra, Carlos AB Using a data set corresponding to an integrated luminosity of 3fb−1, collected by the LHCb experiment in ppcollisions at centre-of-mass energies of 7 and 8TeV, the effective lifetime in the B0s→J/ψηdecay mode, τeff, is measured to beτeff = 1.479±0.034 (stat)±0.011 (syst)ps.Assuming CPconservation, τeffcorresponds to the lifetime of the light B0smass eigenstate. This is the first measurement of the effective lifetime in this decay mode. PB Elsevier SN 0370-2693 YR 2016 FD 2016 LK http://hdl.handle.net/10347/22434 UL http://hdl.handle.net/10347/22434 LA eng NO LHCb Collaboration et al. (2016). Measurement of the B0s→J/ψη lifetime. Physics Letters B, 762, 484-492 DS Minerva RD 24 abr 2026