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arxiv: 0805.0497 · v2 · submitted 2008-05-05 · ✦ hep-ex

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Measurement of the Mass Difference m(B0) - m(B+)

the BABAR Collaboration: B. Aubert , et al
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classification ✦ hep-ex
keywords differencemassapproximatelyb-momentumbabarbbardecaysdetector
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Using 230 million B Bbar events recorded with the BABAR detector at the e+ e- storage rings PEP-II, we reconstruct approximately 4100 B0 to J/psi K+ pi- and 9930 B+ to J/psi K+ decays with J/psi to mu+ mu- and e+ e-. From the measured B-momentum distributions in the e+ e- rest frame, we determine the mass difference m(B0) - m(B+) = (+0.33 +- 0.05 +- 0.03) MeV/c^2.

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