Diffractive W and Z Production at the Fermilab Tevatron

Details Diffractive W and Z Production at the Fermilab Tevatron Diffractive W and Z Production at the Fermilab Tevatron

2010-07-28

arxiv.org/abs/1007.5048v2

Phys.Rev.D82:112004,2010

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 6 figures

Scientific paper

10.1103/PhysRevD.82.112004

We report on a measurement of the fraction of events with a W or Z boson which are produced diffractively in antiproton-proton collisions at a center of mass energy of 1.96 TeV, using data from 0.6 inverse femtobarns of integrated luminosity collected with the CDF-II detector equipped with a Roman-pot spectrometer that detects the antiproton (pbar) from pbar+p --> pbar+[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 [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+pbar --> p+[X+W/Z]+pbar, and on exclusive Z production, pbar+p --> pbar+Z+p. No signal is seen above background for these processes, and comparisons are made with expectations.

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