23 research outputs found
A FABRY-PEROT CAVITY FOR COMPTON POLARIMETRY
A new kind of Compton polarimeter using a resonant Fabry—Pe« rot cavity as a power buildup for the photon beam is proposed. A prototype of such a cavity is described, along with the results obtained in terms of source to be used in a Compton scattering polarimeter. ( 1998 Elsevier Science B.V. All rights reserved
Second Generation Leptoquark Search in p\bar{p} Collisions at = 1.8 TeV
We report on a search for second generation leptoquarks with the D\O\
detector at the Fermilab Tevatron collider at = 1.8 TeV.
This search is based on 12.7 pb of data. Second generation leptoquarks
are assumed to be produced in pairs and to decay into a muon and quark with
branching ratio or to neutrino and quark with branching ratio
. We obtain cross section times branching ratio limits as a function
of leptoquark mass and set a lower limit on the leptoquark mass of 111
GeV/c for and 89 GeV/c for at the 95%\
confidence level.Comment: 18 pages, FERMILAB-PUB-95/185-
Jet Production via Strongly-Interacting Color-Singlet Exchange in Collisions
A study of the particle multiplicity between jets with large rapidity
separation has been performed using the D{\O}detector at the Fermilab Tevatron
Collider operating at TeV. A significant excess of
low-multiplicity events is observed above the expectation for color-exchange
processes. The measured fractional excess is , which is consistent with a strongly-interacting
color-singlet (colorless) exchange process and cannot be explained by
electroweak exchange alone. A lower limit of 0.80% (95% C.L.) is obtained on
the fraction of dijet events with color-singlet exchange, independent of the
rapidity gap survival probability.Comment: 15 pages (REVTeX), 3 PS figs (uuencoded/tar compressed, epsf.sty)
Complete postscript available at http://d0sgi0.fnal.gov/d0pubs/journals.html
Submitted to Physical Review Letter
Measurement of the gauge boson couplings in Collisions at TeV
The gauge boson couplings were measured using () events at TeV observed with the
{D\O} detector at the Fermilab Tevatron Collider. The signal, obtained from the
data corresponding to an integrated luminosity of , agrees
well with the Standard Model prediction. A fit to the photon transverse energy
spectrum yields limits at the 95% confidence level on the CP--conserving
anomalous coupling parameters of ( = 0) and
( = 0).Comment: 16pages (14pages + 2figure pages) Uses ReVTEX Two postscript files
for figures will follow immediatel
Measurement of the and Couplings in Collisions at TeV
We have directly measured the ZZ-gamma and Z-gamma-gamma couplings by
studying p pbar --> l+ l- gamma + X, (l = e, mu) events at the CM energy of
1.813.3 pb^-1)
for the electron (muon) channel, yields the following 95% confidence level
limits on the anomalous CP-conserving ZZ-gamma couplings: -1.9 < h^Z_30 < 1.8
(h^Z_40 = 0), and -0.5 < h^Z_40 < 0.5 (h^Z_30 = 0), for a form-factor scale
Lambda = 500 GeV. Limits for the Z-gamma-gamma$ couplings and CP-violating
couplings are also discussed.Comment: 11 pages, 1 table, and 3 figure
W and Z Boson Production in PbarP Collisions at Sqrt(s)=1.8 TeV
The inclusive cross sections times leptonic branching ratios for W and Z
boson production in PbarP collisions at Sqrt(s)=1.8 TeV were measured using the
D0 detector at the Fermilab Tevatron collider:
Sigma_W*B(W->e, nu) = 2.36 +/- 0.07 +/- 0.13 nb,
Sigma_W*B(W->mu,nu) = 2.09 +/- 0.23 +/- 0.11 nb,
Sigma_Z*B(Z-> e, e) = 0.218 +/- 0.011 +/- 0.012 nb,
Sigma_Z*B(Z->mu,mu) = 0.178 +/- 0.030 +/- 0.009 nb.
The first error is the combined statistical and systematic uncertainty, and
the second reflects the uncertainty in the luminosity. For the combined
electron and muon analyses we find:
[Sigma_W*B(W->l,nu)]/[Sigma_Z*B(Z->l,l)] = 10.90 +/- 0.49.
Assuming Standard Model couplings, this result is used to determine the width
of the W boson:
Gamma(W) = 2.044 +/- 0.093 GeV.Comment: 11 pages (including 2 figure pages), in REVTEX. Two PostScript
figures are appended in a UUencoded fil