We report on a measurement of the fraction of events with a W or Z boson which are produced diffractively in (p) over bar p collisions at root s = 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) over bar from (p) over bar + p -> (p) over bar + [X + W/Z]. We find that (1.00 +/- 0.11)% of Ws and (0.88 +/- 0.22)% of Zs are produced diffractively in a region of antiproton or proton fractional momentum loss xi of 0.03 < xi < 0.10 and 4-momentum transferred squared t of -1 < t < 0 (GeV/c)(2), where we account for the events in which the proton scatters diffractively while the antiproton dissociates, (p) over bar + p -> [X + W/Z] + p, by doubling the measured proton dissociation fraction. We also report on searches for W and Z production in double Pomeron exchange, (p) over bar + p -> [X + W/Z] + p, and on exclusive Z production, (p) over bar + p -> (p) over bar + Z + p. No signal is seen above background for these processes, and comparisons are made with expectations.
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|Titolo:||Diffractive W and Z production at the Fermilab Tevatron|
|Citazione:||T., A., B. A., G., S., A., D., A., A., A., A., A., et al. (2010). Diffractive W and Z production at the Fermilab Tevatron. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82, 112004-1-112004-10.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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