We report the first observation of diffractive J/psi(--> mu (+)mu (-)) production in <(p)power bar> collisions at roots = 1.8 TeV. Diffractive events are identified by their rapidity gap signature. In a sample of events with two muons of transverse momentum p(T)(mu) > 2 GeV/c within the pseudorapidity region \ eta \ < 1.0, the ratio of diffractive to total J/<psi> production rates is found to be R-J/psi = [1.45 +/- 0.25]%. ne ratio R-J/psi(X) is presented as a function of x-Bjorken. By combining it with our previously measured corresponding ratio R-jj(x) for diffractive dijet production, we extract a value of 0.59 +/- 0.15 for the gluon fraction of the diffractive structure function of the proton. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; Ruiz, Alberto/E-4473-2011; St.Denis, Richard/C-8997-2012; Prokoshin, Fedor/E-2795-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012
Observation of diffractive J/psi production at the Fermilab Tevatron
PIACENTINO, Giovanni Maria;
2001-01-01
Abstract
We report the first observation of diffractive J/psi(--> mu (+)mu (-)) production in <(p)power bar> collisions at roots = 1.8 TeV. Diffractive events are identified by their rapidity gap signature. In a sample of events with two muons of transverse momentum p(T)(mu) > 2 GeV/c within the pseudorapidity region \ eta \ < 1.0, the ratio of diffractive to total J/I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.