Measurement of Bottom-Quark Hadron Masses in Exclusive J/ψ Decays with the CDF Detector

Authors

Darin Acosta, University of FloridaFollow
Kenneth A. Bloom, University of Nebraska-LincolnFollow
CDF Collaboration

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(B_s⁰) = 5366.01 ± 0.73_(stat.) ± 0.33_(sys.) MeV/c², m(Λ_b⁰) = 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(B_s⁰)- m(B⁰) = 86.38 ± 0.90_(stat.) ± 0.06_(sys.) MeV/c², m(Λ_b⁰) - m(B⁰) = 339.2 ± 1.4_(stat.)± 0.1_(sys.) MeV/c². The measurements of the B_s⁰, Λ_b⁰ mass, m(B_s⁰)- m(B⁰) and m(Λ_b⁰) - m(B⁰) mass difference are of better precision than the current world averages.