Published in:
Physical Review Letters 96,20 (2006) 202001;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevLett.96.202001
Abstract
We measure the masses of b hadrons in exclusively reconstructed final states containing a J/psi ->mu(-)mu(+) 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/c(2), m(B-0)=5279.63 +/- 0.53((stat.))+/- 0.33((sys.)) MeV/c(2), m(B-s(0))=5366.01 +/- 0.73((stat.))+/- 0.33((sys.)) MeV/c(2), m(Lambda(0)(b))=5619.7 +/- 1.2((stat.))+/- 1.2((sys.)) MeV/c(2). m(B+)-m(B-0)=-0.53 +/- 0.67((stat.))+/- 0.14((sys.)) MeV/c(2), m(B-s(0))-m(B-0)=86.38 +/- 0.90((stat.))+/- 0.06((sys.)) MeV/c(2), m(Lambda(0)(b))-m(B-0)=339.2 +/- 1.4((stat.))+/- 0.1((sys.)) MeV/c(2). The measurements of the B-s(0), Lambda(0)(b) mass, m(B-s(0))-m(B-0) and m(Lambda(0)(b))-m(B-0) mass difference are of better precision than the current world averages.
Keywords
lambda(b) baryon;; particle physics
Date of this Version
January 2006