The decays W --> ev and Z --> e+e- are studied in ppBAR collisions at square-root s = 630 GeV. The products of production cross section and branching ratio are measured as sigma(W)e = 682 +/- 12 +/- 40 pb and sigma(Z)e = 65.6 +/- 4.0 +/- 3.8 pb. The results are in good agreement with O (alpha(s)2) calculations of the production cross sections. Many systematic effects cancel in the ratio, R = 10.4 +/- 0.6(0.7) +/- 0.3, which can be used to give an indirect measurement of the total width of the W boson: GAMMA(W) = 2.10 +/- 0.13 +/- 0.09 GeV. The width gives a limit on the top quark mass, m(top) > 53 GeV (95% CL), which is independent of the top decay mode.
A MEASUREMENT OF THE W AND Z PRODUCTION CROSS-SECTIONS AND A DETERMINATION OF GAMMA-W AT THE CERN PBARP COLLIDER
CAVASINNI, VINCENZO;COSTANTINI, FLAVIO;
1992-01-01
Abstract
The decays W --> ev and Z --> e+e- are studied in ppBAR collisions at square-root s = 630 GeV. The products of production cross section and branching ratio are measured as sigma(W)e = 682 +/- 12 +/- 40 pb and sigma(Z)e = 65.6 +/- 4.0 +/- 3.8 pb. The results are in good agreement with O (alpha(s)2) calculations of the production cross sections. Many systematic effects cancel in the ratio, R = 10.4 +/- 0.6(0.7) +/- 0.3, which can be used to give an indirect measurement of the total width of the W boson: GAMMA(W) = 2.10 +/- 0.13 +/- 0.09 GeV. The width gives a limit on the top quark mass, m(top) > 53 GeV (95% CL), which is independent of the top decay mode.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
