1,239 research outputs found
Standard Model Higgs Physics at a 4 TeV Upgraded Tevatron
We compute an array of Standard Model Higgs boson (\hsm) signals and
backgrounds for a possible upgrade of the Tevatron to E_{\rm cm}=4\tev.
Taking \mt\geq 140\gev, and assuming a total accumulated luminosity of
L=30\fbi, we find that a Standard Model Higgs boson with \mhsm\lsim 110\gev
could almost certainly be detected using the \wpm\hsm\rta l\nu b\anti b mode.
A Higgs boson with mass between \sim 120\gev and \sim 140\gev or above
\sim 230-250\gev almost certainly would not be seen. A Higgs boson with
\mhsm\sim 150\gev or 200\lsim\mhsm\lsim 230-250\gev has a decent chance of
being detected in the ZZ\rta 4l mode. There would also be some possibility of
discovering the \hsm in the WW\rta l\nu jj mode for 150\lsim\mhsm\lsim
200\gev. Finally, hints of an event excess in the WW\rta ll \nu\nu mode due
to the \hsm might emerge for 140\lsim\mhsm\lsim 180\gev. Given the
difficult nature of the Higgs boson signals for \mhsm values beyond the reach
of LEP-200, and the discontinuous \mhsm range that could potentially be
probed, justification of an upgrade of the Tevatron to 4\tev on the basis of
its potential for Standard Model Higgs boson discovery would seem
inappropriate.Comment: 21 pages; requires phyzzx.tex and tables.tex; full postscript file
including embedded figures available via anonymous ftp at ucdhep.ucdavis.edu
as [anonymous.gunion]4tev.ps, preprint UCD-94-1
QCD and Yukawa corrections to single-top-quark production via q qbar -> t bbar
We calculate the O(alpha_s) and O(alpha_W m_t^2/M_W^2) corrections to the
production of a single top quark via the weak process q qbar -> t bbar at the
Fermilab Tevatron and the CERN Large Hadron Collider. An accurate calculation
of the cross section is necessary in order to extract |V_tb| from experiment.Comment: LaTeX, 13 pages, replaced with version to appear in Phys. Rev.
More Signatures of the Intermediate Mass Higgs Boson
We examine the potential signatures of the Higgs boson when it decays into a
tau-lepton pair. We show that with the proper identification of the tau-jet,
this decay mode can lead to the identification of the Higgs boson over most of
the intermediate mass range (\mW \mH 2 \mW).Comment: 10 pages, LaTeX fil
Associated Production of Higgs and Weak Bosons, with H -> b\bar b, at Hadron Colliders
We consider the search for the Higgs boson at a high-luminosity Fermilab
Tevatron, an upgraded Tevatron of energy 3.5 TeV, and the CERN Large Hadron
Collider, via production followed by H -> bb~ and leptonic decay of the
weak vector bosons. We show that each of these colliders can potentially
observe the standard Higgs boson in the intermediate-mass range, 80 GeV <m_H <
120 GeV. This mode complements the search for and the study of the
intermediate-mass Higgs boson via H -> \gamma\gamma at the LHC. In addition, it
can potentially be used to observe the lightest Higgs scalar of the minimal
supersymmetric model in a region of parameter space not accessible to CERN LEP
II or the LHC (using h -> \gamma\gamma,ZZ^*).Comment: (changed the analysis of ZH production and the figures for susy), 17
pages + 7 figures, ILL-(TH)-94-8, BNL-6034
Anomalous Higgs Couplings
We review the effects of new effective interactions on the Higgs boson
phenomenology. New physics in the electroweak bosonic sector is expected to
induce additional interactions between the Higgs doublet field and the
electroweak gauge bosons leading to anomalous Higgs couplings as well as to
anomalous gauge-boson self-interactions. Using a linearly realized invariant effective Lagrangian to describe the bosonic sector of
the Standard Model, we review the effects of the new effective interactions on
the Higgs boson production rates and decay modes. We summarize the results from
searches for the new Higgs signatures induced by the anomalous interactions in
order to constrain the scale of new physics in particular at CERN LEP and
Fermilab Te vatron colliders.Comment: 35 pages, latex using epsfig.sty psfig.sty and axodraw.sty, 16
postscript figure
A double parton scattering background to Higgs boson production at the LHC
The experimental capability of recognizing the presence of b quarks in
complex hadronic final states has addressed the attention towards final states
with b\bar{b} pairs for observing the production of the Higgs boson at the LHC,
in the intermediate Higgs mass range.We point out that double parton scattering
processes are going to represent a sizeable background to the process.Comment: 9 pages, 2 figure
at Hadron Colliders
We study the observability for a lepton flavor-changing decay of a Higgs
boson at hadron colliders. Flavor-changing couplings of a Higgs
boson exist at tree level in models with multiple Higgs doublets. The
coupling is particularly motivated by the favorable intepretation of
oscillation. We find that at the Tevatron Run II the unique
signature could serve as the Higgs discovery channel, surpassing
expectations for Higgs boson searches in the SM and in a large parameter region
of the MSSM. The sensitivity will be greatly improved at the LHC, beyond the
coverage at a muon collider Higgs factory.Comment: Version to appear in PR
Yukawa Corrections to Top Quark Production at the LHC in Two- Higgs-Doublet Models
The O(alpha m_t^2/m_W^2) corrections to top quark pair production by
gluon-gluon fusion at the LHC are calculated in two-Higgs-doublet models. We
find that the correction to the cross-section can exceed about -10% for certain
parameter values.Comment: 16-page text in LaTex. uuencoded file for Fig.1-6 will be sent
separatel
Shape of a liquid front upon dewetting
We examine the profile of a liquid front of a film that is dewetting a solid
substrate. Since volume is conserved, the material that once covered the
substrate is accumulated in a rim close to the three phase contact line.
Theoretically, such a profile of a Newtonian liquid resembles an exponentially
decaying harmonic oscillation that relaxes into the prepared film thickness.
For the first time, we were able to observe this behavior experimentally. A
non-Newtonian liquid - a polymer melt - however, behaves differently. Here,
viscoelastic properties come into play. We will demonstrate that by analyzing
the shape of the rim profile. On a nm scale, we gain access to the rheology of
a non-Newtonian liquid.Comment: 4 pages, 4 figure
The Reach of CERN LEP2 and Fermilab Tevatron Upgrades for Higgs Bosons in Supersymmetric Models
Luminosity upgrades of the Fermilab Tevatron pbar-p collider have been shown
to allow experimental detection of a Standard Model (SM) Higgs boson up to
GeV via events. This limit
nearly saturates the parameter space for many models of weak scale
supersymmetry (SUSY) with a minimal particle content. It is therefore
interesting to examine the SUSY Higgs reach of future Tevatron experiments.
Contours are presented of Higgs boson reach for CERN LEP2 and Tevatron
luminosity upgrades for three models of weak scale SUSY: the Minimal
Supersymmetric Standard Model (MSSM), the minimal Supergravity model (mSUGRA)
and a simple Gauge Mediated SUSY Breaking Model (GMSB). In each case we find a
substantial gain in reach at the Tevatron with integrated luminosity increasing
from 10 fb^{-1} to 25-30 fb^{-1}. With the larger integrated luminosity, a
Higgs search at the Tevatron should be able to probe essentially the entire
parameter space of these models. While a discovery would be very exciting, a
negative result would severely constrain our ideas about how weak scale
supersymmetry is realized.Comment: 12 pages + 7 figures. Uses REVTEX and epsf macros. Several references
added, stated value of A-parameters corrected, note added reguarding sgn(mu)
dependence in MSSM case. To appear in Physical Review
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