Research Papers in Physics and Astronomy

 

Date of this Version

5-26-2006

Comments

Published by American Physical Society. Phys. Rev. Lett. 96, 202001 (2006). http://prl.aps.org. Copyright © 2006 American Physical Society. Permission to use.

Abstract

We measure the masses of b hadrons in exclusively reconstructed final states containing a J/ ψ →μ-μ+ decay using 220 pb-1 of data collected by the CDF II experiment. We find: m(B+) = 5279.10 ± 0.41(stat.) ± 0.36(sys.) MeV/c2, m(B0) ± 5279.63 ± 0.53(stat.) ± 0.33(sys.) MeV/c2, m(Bs0) = 5366.01 ± 0.73(stat.) ± 0.33(sys.) MeV/c2, mb0) = 5619.7 ± 1.2(stat.) ± 1.2(sys.) MeV/c2, m( B+)-m( B0) =-0.53 ± 0.67(stat.) ±0.14(sys.) MeV/c2, m(Bs0)- m(B0) = 86.38 ± 0.90(stat.) ± 0.06(sys.) MeV/c2, mb0) - m(B0) = 339.2 ± 1.4(stat.)± 0.1(sys.) MeV/c2. The measurements of the Bs0, Λb0 mass, m(Bs0)- m(B0) and mb0) - m(B0) mass difference are of better precision than the current world averages.

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