17 research outputs found
Quark-Loop Amplitudes for W^+- H^-+ Associated Hadroproduction
In this addendum to our paper entitled "W^+- H^-+ Associated Production at
the Large Hadron Collider" [Phys. Rev. D 59, 015009 (1999)], we list analytic
results for the helicity amplitudes of the partonic subprocess gg -> W^-H^+
induced by virtual quarks.Comment: 6 pages (Latex
H^+H^- Pair Production at the Large Hadron Collider
We study the pair production of charged Higgs bosons at the CERN Large Hadron
Collider in the context of the minimal supersymmetric extension of the standard
model. We compare the contributions due to qq-bar annihilation at the tree
level and gg fusion, which proceeds at one loop. At small or large values of
tan(beta), H^+H^- production proceeds dominantly via bb-bar annihilation, due
to Feynman diagrams involving neutral CP-even Higgs bosons and top quarks,
which come in addition to the usually considered Drell-Yan diagrams. In the
case of gg fusion, the squark loop contributions may considerably enhance the
well-known quark loop contributions.Comment: 15 pages (Latex), 4 figures (Postscript
Virtual Sfermion Effects on Vector-Boson Pair Production at e^+e^- Colliders
We study the quantum effects on vector-boson pair production in e^+e^-
annihilation induced by the sleptons and squarks of the minimal supersymmetric
extension of the standard model (MSSM) in the one-loop approximation. We list
full analytic results, and quantitatively analyze the resulting deviation from
the standard-model prediction of e^+e^- -> W^+W^- for the supergravity-inspired
MSSM. The latter can be rendered small throughout the whole parameter space by
an appropriate choice of renormalization scheme.Comment: 11 pages (Latex), 3 figures (Postscript); MSSM parameter space
restricted by imposing experimental search limits, references added; accepted
for publication in Phys. Lett.
Squark Loop Correction to W^{+-} H^{-+} Associated Hadroproduction
We study the squark loop correction to W^{+-} H^{-+} associated
hadroproduction via gluon-gluon fusion within the minimal supersymmetric
extension of the standard model. We list full analytic results and
quantitatively analyze the resulting shift in the cross section at the CERN
Large Hadron Collider assuming a supergravity-inspired scenario.Comment: 13 pages (Latex), 5 figures (Postscript
Pair production of neutral Higgs bosons at the CERN Large Hadron Collider
We study the hadroproduction of two neutral Higgs bosons in the minimal
supersymmetric extension of the standard model, which provides a handle on the
trilinear Higgs couplings. We include the contributions from quark-antiquark
annihilation at the tree level and those from gluon-gluon fusion, which
proceeds via quark and squark loops. We list compact results for the tree-level
partonic cross sections and the squark loop amplitudes, and we confirm previous
results for the quark loop amplitudes. We quantitatively analyze the hadronic
cross sections at the CERN Large Hadron Collider assuming a favorable
supergravity-inspired scenario.Comment: 22 pages (Latex), 16 figures (Postscript). Discussion of theoretical
uncertainties and background processes added. Accepted for publication in
Phys. Rev.
Electroweak Corrections to the Charged Higgs Boson Decay into Chargino and Neutralino
The electroweak corrections to the partial widths of the decays including one-loop
diagrams of the third generation quarks and squarks, are investigated within
the Supersymmetric Standard Model. The relative corrections can reach the
values about 10%, therefore they should be taken into account for the precise
experimental measurement at future colliders.Comment: 21 pages, 6 eps figures, 1 Latex fil
Associated H W Production in High Energy Collisions
We study the associated production of charged Higgs bosons with gauge
bosons in high energy collisions at the one loop level. We present
the analytical results and give a detailed discussion for the total cross
section predicted in the context of a general Two Higgs Doublet Model (THDM).Comment: Latex, 31 pages, 6 figures, cosmetically improved and one reference
adde
Charged Higgs Boson Production in Bottom-Gluon Fusion
We compute the complete next-to-leading order SUSY-QCD corrections for the
associated production of a charged Higgs boson with a top quark via
bottom-gluon fusion. We investigate the applicability of the bottom parton
description in detail. The higher order corrections can be split into real and
virtual corrections for a general two Higgs doublet model and into additional
massive supersymmetric loop contributions. We find that the perturbative
behavior is well under control. The supersymmetric contributions consist of the
universal bottom Yukawa coupling corrections and non-factorizable diagrams.
Over most of the relevant supersymmetric parameter space the Yukawa coupling
corrections are sizeable, while the remaining supersymmetric loop contributions
are negligible.Comment: 18 pages, v2: some discussions added, v3: published versio
Higgs Boson Theory and Phenomenology
Precision electroweak data presently favors a weakly-coupled Higgs sector as
the mechanism responsible for electroweak symmetry breaking. Low-energy
supersymmetry provides a natural framework for weakly-coupled elementary
scalars. In this review, we summarize the theoretical properties of the
Standard Model (SM) Higgs boson and the Higgs sector of the minimal
supersymmetric extension of the Standard Model (MSSM). We then survey the
phenomenology of the SM and MSSM Higgs bosons at the Tevatron, LHC and a future
e+e- linear collider. We focus on the Higgs discovery potential of present and
future colliders and stress the importance of precision measurements of Higgs
boson properties.Comment: 90 pages, 31 figures. Revised version. To be published in Progress in
Particle and Nuclear Physics. This paper with higher resolution figures can
be found at http://scipp.ucsc.edu/~haber/higgsreview/higgsrev.p
Searching for Heavy Charged Higgs Boson with Jet Substructure at the LHC
We study the heavy charged Higgs boson (from 800 GeV to 1500 GeV in this
study) in production associated with a top quark at the LHC with the collision
energy TeV. Such a heavy charged Higgs boson can dominantly decay
into a top quark and a bottom quark due to its large Yukawa couplings, like in
MSSM. To suppress background events and to confirm the signal, we reconstruct
the mass bumps of the heavy charged Higgs boson and the associated top quark.
For this purpose, we propose a hybrid-R reconstruction method which utilizes
the top tagging technique, a jet substructure technique developed for highly
boosted massive particles. By using the full hadronic mode of as a test field, we find that this method can greatly reduce the
combinatorics in the full reconstruction and can successfully reduce background
events down to a controlled level. The sensitivity of LHC to the heavy charged
Higgs boson with two taggings is studied and a significance can
be achieved when .Comment: 27 pages, 10 figures, 7 tables; v2: some typos corrected and
references added; v3: discussion added, Fig.10 and Table7 updated, version
published in JHE