We report on a measurement of the fraction of events with a W or Z boson produced diffractively in p anti-p collisions at s**(1/2) 1.96 TeV, using data from 0.6 fb-1 of integrated luminosity collected with the CDF II detector equipped with a Roman-pot spectrometer that detects the p-bar from p-bar + p --> p-bar + [X + W/Z]. We find that (0.97 +/- 0.11)% of Ws and (0.85 +/- 0.22)% of Zs are produced diffractively in a region of (anti)proton fractional momentum loss xi of 0.03 < xi < 0.10 and 4-momentum transferred squared t of -1 < t < 0 (GeV/c)2. We also report on searches for W and Z production in double Pomeron exchange, p + p-bar --> p+[X + W/Z] + p-bar, and on exclusive Z production, p-bar + p --> p-bar + Z + p. No signal is seen above background for these processes, and comparisons are made with expectations.
Diffractive W and Z Production at the Fermilab Tevatron
CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MARGAROLI, FABRIZIO;MAZZANTI, PAOLO;MOGGI, NICCOLO';MUSSINI, MANUEL;RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2010
Abstract
We report on a measurement of the fraction of events with a W or Z boson produced diffractively in p anti-p collisions at s**(1/2) 1.96 TeV, using data from 0.6 fb-1 of integrated luminosity collected with the CDF II detector equipped with a Roman-pot spectrometer that detects the p-bar from p-bar + p --> p-bar + [X + W/Z]. We find that (0.97 +/- 0.11)% of Ws and (0.85 +/- 0.22)% of Zs are produced diffractively in a region of (anti)proton fractional momentum loss xi of 0.03 < xi < 0.10 and 4-momentum transferred squared t of -1 < t < 0 (GeV/c)2. We also report on searches for W and Z production in double Pomeron exchange, p + p-bar --> p+[X + W/Z] + p-bar, and on exclusive Z production, p-bar + p --> p-bar + Z + p. No signal is seen above background for these processes, and comparisons are made with expectations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.