135 research outputs found
Pair production of W bosons at the photon linear collider: a window to the electroweak symmetry breaking?
Recent progress in calculating O(alpha) electroweak corrections to W+W- pair
production in photon-photon collisions is reviewed. The potential of the Photon
Linear Collider to study anomalous W couplings is discussed.Comment: Talk given at 5th International conference on physics Beyond the
Standard Model, Balholm, Norway, April 29 - May 4, 1997, 6 pages, 2
Postscript figures, uses epsf.st
Light Higgs production at the Compton Collider
We have studied the production of a light Higgs boson with a mass of 120 GeV
in photon-photon collisions at a Compton collider. The event generator for the
backgrounds to a Higgs signal due to bbbar and ccbar heavy quark pair
production in polarized gamma-gamma collisions is based on a complete
next-to-leading order (NLO) perturbative QCD calculation. For J_z=0 the large
double-logarithmic corrections up to four loops are also included. It is shown
that the two-photon width of the Higgs boson can be measured with high
statistical accuracy of about 2 % for integrated gamma-gamma luminosity in the
hard part of the spectrum of 40 fb**-1. As a result the total Higgs boson width
can be calculated in a model independent way to an accuracy of about 14 %Comment: submitted to the proceedings of the International Workshop on Linear
Colliders (LCWS99) at Sitges, Spain, 28 April - 5 May 199
Using Charge Asymmetries to Measure Single Top Quark Production at the LHC
Electroweak production of single top quarks is an as-yet-unverified
prediction of the Standard model, potentially sensitive to new physics. Two of
the single top quark productions channels have significant charge asymmetries
at the LHC, while the much larger background from is nearly
charge-symmetric. This can be used to reduce systematic uncertainties and make
precision measurements of single top quark production.Comment: 4 pages, 1 figur
Pair Production at the Photon Linear Collider
scattering at the Photon Linear Collider is
considered. Explicit formulas for helicity amplitudes due to boson loops
are presented. It is shown that the pair production will be easily
observable at PLC and separation of the loop contribution will be possible
at c.m. energy of 300~GeV or higher.Comment: 9 pages of standard LaTeX + 3 PostScript figures (uuencoded and
compressed
LHC Charge Asymmetry as Constraint on Models for the Tevatron Top Anomaly
The forward-backward asymmetry in top quark production at
the Tevatron has been observed to be anomalously large by both CDF and D0. It
has been suggested that a model with a coupling to and might
explain this anomaly, and other anomalies in mesons. Single-top-quark
production in this model is large, and arguably in conflict with Tevatron
measurements. However the model might still be viable if is
somewhat smaller than its current measured central value. We show that even
with smaller couplings, the model can be discovered (or strongly excluded) at
the LHC using the 2010 data sets. We find that a suitable charge-asymmetry
measurement is a powerful tool that can be used to constrain this and other
sources of anomalous single-top production, and perhaps other new high-energy
charge-asymmetric processes.Comment: 25 pages, 4 figures, note adde
Photon-Photon Scattering at the Photon Linear Collider
Photon-photon scattering at the Photon Linear Collider is considered.
Explicit formulas for helicity amplitudes due to boson loops are presented.
It is shown that photon-photon scattering should be easily observable at PLC
and separation of the loop contribution (which dominates at high energies)
will be possible at c.m. energy of 500~GeV or higher.Comment: Standard LaTeX. 8 pages+5 figures (available by regular mail). IHEP
93-8
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