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

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

2008-05-05

arxiv.org/abs/0805.0497v2

Phys.Rev.D78:011103,2008

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 2 postscript figures, sumbmitted to Phys. Rev. D, Rapid Communications

Scientific paper

10.1103/PhysRevD.78.011103

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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