1,619 research outputs found
Radion and Higgs Signals in Peripheral Heavy Ion Collisions at the LHC
We investigate the sensitivity of the heavy ion mode of the LHC to Higgs
boson and Radion production via photon-photon fusion through the analysis of
the processes photon to photon photon, photon photon to b anti-b, and photon
photon to g g in peripheral heavy ion collisions. We suggest cuts to improve
the Higgs and Radion signal over standard model background ratio and determine
the capability of LHC to detect these particles production.Comment: 16 pages, 8 eps figures. admin note: text overlap with
arXiv:hep-ph/0009232 by different autho
String theory duals of Wilson loops from Higgsing
For three-dimensional ABJ(M) theories and Chern-Simons-matter
quiver theories, we construct two sets of 1/2 BPS Wilson loop operators by
applying the Higgsing procedure along independent directions of the moduli
space, and choosing different massive modes. For theories whose dual M-theory
description is known, we also determine the corresponding spectrum of 1/2 BPS
M2-brane solutions. We identify the supercharges in M-theory and field theory,
as well as the supercharges preserved by M2-/anti-M2-branes and 1/2 BPS Wilson
loops. In particular, in orbifold ABJM theory we find pairs of
different 1/2 BPS Wilson loops that preserve exactly the same set of
supercharges. In field theory they arise by Higgsing with the choice of either
particles or antiparticles, whereas in the dual description they correspond to
a pair of M2-/anti-M2-branes localized at different positions in the compact
space. This result enlightens the origin of classical Wilson loop degeneracy in
these theories, already discussed in arXiv:1506.07614. A discussion on possible
scenarios that emerge by comparison with localization results is included.Comment: 52 pages, 4 figures; V2, 61 pages, 4 figures, supercharges in gravity
and field theory identified, conclusion unchanged, published versio
New Higgs Interactions in ZZ\gamma and Z\gamma\gamma Production
The effect of new operators that only modify the bosonic couplings of the
Higgs boson, without altering the WW\gamma or WWZ three-point functions, are
examined in the e+e- -> ZZ\gamma and Z\gamma\gamma processes. We analyse the
constraints on these interactions that can be imposed by the LEP II collider at
CERN and at the Next Linear Collider.Comment: 7 pages, RevTeX, 3 postscript figure
Steering efficiency of a ultrarelativistic proton beam in a thin bent crystal
Crystals with small thickness along the beam exhibit top performance for
steering particle beams through planar channeling. For such crystals, the
effect of nuclear dechanneling plays an important role because it affects their
efficiency. We addressed the problem through experimental work carried out with
400 GeV/c protons at fixed-target facilities of CERN-SPS. The dependence of
efficiency vs. curvature radius has been investigated and compared favourably
to the results of modeling. A realistic estimate of the performance of a
crystal designed for LHC energy including nuclear dechanneling has been
achieved.Comment: 16 pages, 6 figure
Probing Intermediate Mass Higgs Interactions at the CERN Large Hadron Collider
We analyze the potentiality of the CERN Large Hadron Collider to probe the
Higgs boson couplings to the electroweak gauge bosons. We parametrize the
possible deviations of these couplings due to new physics in a model
independent way, using the most general dimension--six effective lagrangian
where the SU(2)_L x U(1)_Y is realized linearly. For intermediate Higgs masses,
the decay channel into two photons is the most important one for Higgs searches
at the LHC. We study the effects of these new interactions on the Higgs
production mechanism and its subsequent decay into two photons. We show that
the LHC will be sensitive to new physics scales beyond the present limits
extracted from the LEP and Tevatron physics.Comment: 13 pages, 1 figure included using epsfig, RevTe
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