| Document(s) |
Phys.Rev.D82:112004,2010
arXiv:1007.5048
fig 1
fig 2
fig 3
fig 4
fig 5
fig 6a
fig 6b
|
| Contact(s) |
M. Convery, K. Goulianos
|
| Abstract |
We report on a measurement of the fraction of events with a W or Z boson which
are produced diffractively in pbar p collisions at sqrt(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 pbar from
pbar+p-> pbar+[X+W/Z]. We find that (1.00+/-0.11)% of W's and (0.88+/-0.22)% of
Z's 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, pbar+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+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.
|
| Comments |
Last Update: Jan 2011 Dataset: 0.6 fb-1
|
|