7,557 research outputs found
Electroweak Radiative Corrections to Weak Boson Production at Hadron Colliders
We summarize the status of calculations of the electroweak radiative
corrections to W and Z boson production via the Drell-Yan mechanism at hadron
colliders. To fully exploit the precision physics potential of the
high-luminosity environment of the Fermilab Tevatron pbar p (Run II) and the
CERN LHC pp colliders, it is crucial that the theoretical predictions are well
under control. The envisioned precision physics program includes a precise
measurement of the W boson mass and width, and the (leptonic) weak mixing
angle, as well as probing the Standard Model (SM) of electroweak interactions
at the highest accessible center-of-mass energies. Some numerical results are
presented.Comment: Latex, 5 pages, 4 figures, talk given by UB at RADCOR2002/Loops and
Legs, Kloster Banz, Germany, Sep. 2002, to appear in the Proceeding
Electroweak Radiative Corrections to W and Z Boson Production at Hadron Colliders
For the envisioned high precision measurement of the W boson mass at the
Tevatron and LHC it is crucial that the theoretical predictions for the W and Z
production processes are under control. We briefly summarize the status of the
electroweak radiative corrections to p p(pbar) -> W -> l nu and p p(pbar) ->
Z,gamma -> l+ l- (l=e,mu), and present some numerical results.Comment: 3 pages, 1 figure, talk given at the DPF2000 meeting, Columbus, OH,
August 9-12, 200
Probing Neutral Gauge Boson Self-interactions in ZZ Production at Hadron Colliders
A detailed analysis of ZZ production at the upgraded Fermilab Tevatron and
the CERN Large Hadron Collider is presented for general ZZZ and ZZ\gamma
couplings. Deviations from the Standard Model gauge theory structure for each
of these can be parameterized in terms of two form factors which are severely
restricted by unitarity at high energy. Achievable limits on these couplings
are shown to be a dramatic improvement over the limits currently obtained by
e^+e^- experiments.Comment: 36 pages, 15 figures, revte
Photon-Photon and Photon-Hadron Interactions at Relativistic Heavy Ion Colliders
In central collisions at relativistic heavy ion colliders like the
Relativistic Heavy Ion Collider RHIC/Brookhaven and the Large Hadron Collider
LHC (in its heavy ion mode) at CERN/Geneva, one aims at detecting a new form of
hadronic matter --- the Quark Gluon Plasma. We discuss here a complementary
aspect of these collisions, the very peripheral ones. Due to coherence, there
are strong electromagnetic fields of short duration in such collisions. They
give rise to photon-photon and photon-nucleus collisions with high flux up to
an invariant mass region hitherto unexplored experimentally. After a general
survey photon-photon luminosities in relativistic heavy ion collisions are
discussed. Then photon-photon physics at various gamma-gamma-invariant mass
scales is discussed. The region of several GeV, relevant for RHIC is dominated
by QCD phenomena (meson and vector meson pair production). Invariant masses of
up to about 100 GeV can be reached at LHC, and the potential for new physics is
discussed. Lepton-pair production, especially electron-positron pair production
is copious. Due to the strong fields there will be new phenomena, especially
multiple e+e- pair production.Comment: 10 pages, Proceedings of the Erice Summer School on Heavy Ion Physics
199
Quark resonances and high E_t jets
Possible spin-3/2 quark resonances would have a significant effect on high
E_{\mbox{\rm t}} jet production through their contribution to the subprocess
. Such enhancements are compared to a, recently
reported, anomaly in inclusive jet production at the CDF detector.Comment: 7 pages set in RevTex with four postscript figures appended- all
uuencode
Probing the Higgs self-coupling at hadron colliders using rare decays
We investigate Higgs boson pair production at hadron colliders for Higgs
boson masses m_H\leq 140 GeV and rare decay of one of the two Higgs bosons.
While in the Standard Model the number of events is quite low at the LHC, a
first, albeit not very precise, measurement of the Higgs self-coupling is
possible in the gg -> HH -> b\bar{b}\gamma\gamma channel. A luminosity-upgraded
LHC could improve this measurement considerably. A 200 TeV VLHC could make a
measurement of the Higgs self-coupling competitive with a next-generation
linear collider. In the MSSM we find a significant region with observable Higgs
pair production in the small \tan\beta regime, where resonant production of two
light Higgs bosons might be the only hint at the LHC of an MSSM Higgs sector.Comment: Revtex, 23 pages, 4 tables, 7 figure
Finite Width Effects and Gauge Invariance in Radiative Production and Decay
The naive implementation of finite width effects in processes involving
unstable particles can violate gauge invariance. For the example of radiative
production and decay, , at tree level, it is
demonstrated how gauge invariance is restored by including the imaginary part
of triangle graphs in addition to resumming the imaginary contributions to the
vacuum polarization. Monte Carlo results are presented for the Fermilab
Tevatron.Comment: 10 pages, Revtex, 3 figures submitted separately as uuencoded tarred
postscript files, the complete paper is available at
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-878.ps.Z or
http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-878.ps.
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