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.
Measurement of bottom-quark hadron masses in exclusive J/psi decays with the CDF detector
CIOCCI, MARIA AGNESE;DONATI, SIMONE;
2006-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.