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Measurement of the Mass Difference m(B0) - m(B+) Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Particle physics Experiments 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 . 2019-04-05T10:23:21Z 2019-04-05T10:23:21Z 2008-07-15 2019-04-05T10:23:21Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/131519 577680 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.78.011103 Physical Review D, 2008, vol. 78, num. 1, p. 011103 https://doi.org/10.1103/PhysRevD.78.011103 (c) American Physical Society, 2008 info:eu-repo/semantics/openAccess 8 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)