2026-04-17T16:15:29Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1315192025-12-05T16:51:08Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Garra Ticó, Jordi author Graugés Pous, Eugeni author BABAR Collaboration author 2019-04-05T10:23:21Z 2019-04-05T10:23:21Z 2008-07-15 2019-04-05T10:23:21Z Using 230 × 10 6 B ¯¯¯ B events recorded with the BABAR detector at the e + e − storage rings PEP-II, we reconstruct approximately 4100 B 0 → J / ψ K + π − and 9930 B + → J / ψ K + decays with J / ψ → μ + μ − and e + e − . From the measured B -momentum distributions in the e + e − rest frame, we determine the mass difference m ( B 0 ) − m ( B + ) = ( + 0.33 ± 0.05 ± 0.03 )     MeV / c 2 . Física de partícules Experiments Particle physics Experiments Measurement of the Mass Difference m(B0) - m(B+)