12,250 research outputs found
H-->WW as the discovery mode for a light Higgs boson
The production cross section for a m_H=115 GeV, SM Higgs boson in weak boson
fusion at the LHC is sizable. However, the branching fraction for H-->WW is
expected to be relatively small. The signal, with its two forward jets, is
sufficiently different from the main backgrounds that a signal to background
ratio of better than 1:1 can nevertheless be obtained, with large enough rate
to allow for a 5 sigma signal with 35 fb^{-1} of data. The H-->WW signal in
weak boson fusion may thus prove to be the discovery mode for the Higgs boson
at the LHC.Comment: 10 pages, 4 figures, uses revte
Finding the Leptonic Decay Mode of a Heavy Higgs Boson
We reanalyze the extraction of the heavy Higgs boson signal from the
Standard Model background at hadron supercolliders, taking into account revised
estimates of the top quark background. With new acceptance criteria the
detection of the signal remains viable. Requiring a forward jet-tag, a central
jet-veto, and a large relative transverse momentum of the two charged leptons
yields for one year of running at the SSC or LHC.Comment: LaTex(Revtex), 9 pages, 6 figures (available upon request),
MAD/PH/75
Supersymmetry Phenomenology at Hadron Colliders
The phenomenology of a low-energy supersymmetry at hadron colliders is
discussed with consideration of the minimal supergravity model, with a large
top quark Yukawa coupling at the grand unification mass scale, and gauge
mediated symmetry breaking models. Possible supersymmetry interpretations of
some unexplained events are mentioned.Comment: 11 pages, Latex2.09, uses sprocl.sty (included) and epsf.sty. 5
postscript figures. Talk presented at COSMO 97: International Workshop on
Particle Physics and the Early Universe, Lancaster, UK, Sept. 1997.
Postscript file of complete paper also available at
http://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1034.ps.Z or at
ftp://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1034.ps.
Testing the LMA solution with solar neutrinos independently of solar models
We perform a comparative study of two methods of determining the survival
probabilities of low, intermediate, and high energy solar neutrinos that
emphasizes the general agreement between the Large Mixing Angle (LMA) solution
and extant solar neutrino data. The first analysis is oscillation
parameter-independent and the second analysis involves an approximate
calculation of the survival probabilities in the three energy ranges that
depends only on oscillation parameters. We show that future experiments like
BOREXino, CLEAN, Heron, LENS and MOON, that measure and Be neutrinos,
will facilitate a stringent test of the LMA solution independently of the
Standard Solar Model (SSM), without recourse to earth-matter effects.
Throughout, we describe the role of SSM assumptions on our results. If the LMA
solution passes the test without needing to be modified, it may be possible to
establish that is nonzero at more than assuming the SSM
prediction for the flux is correct.Comment: Final SNO salt-phase data included in analysis. Version to appear in
PL
Higgs Physics and Supersymmetry
The quest for the physics underlying the breaking of the electroweak symmetry
and the generation of mass is surveyed.Comment: 14 pages, Latex2.09, uses sprocl.sty and epsf.sty, 13 postscript
files included. Talk presented at the Richard Arnowitt Fest: A Symposium on
Supersymmetry and Gravitation, College Station, Texas, April 1998. Local-no:
MADPH-98-106
Neutrino Masses and Mixing at the Millennium
Recent evidence for neutrino oscillations has revolutionized the study of
neutrino masses and mixing. This report gives an overview of what we are
learning from the neutrino oscillation experiments, the prospects for the near
term, and the bright future of neutrino mass studies.Comment: References added. Latex2.09, uses epsf.sty and aipproc.sty, 16 pages,
14 figures. Talk presented at the 5th International Conference on Physics
Potential and Development of mu^+ mu^- Colliders, San Francisco, December
199
Supersymmetry vis-a-vis Muon Colliders
The potential of muon colliders to study a low-energy supersymmetry is
addressed in the framework of the minimal supergravity model, whose predictions
are first briefly surveyed. Foremost among the unique features of a muon
collider is s-channel production of Higgs bosons, by which Higgs boson masses,
widths, and couplings can be precisely measured to test the predictions of
supersymmetry. Measurements of the threshold region cross sections of W^+ W^-,
t t-bar, Zh, chargino pairs, slepton and sneutrino pairs will precisely
determine the corresponding masses and test supersymmetric radiative
corrections. At the high-energy frontier a 3 to 4 TeV muon collider is ideally
suited to study heavy scalar supersymmetric particles.Comment: 14 pages, Latex2.09, uses aipproc.sty and espf.sty. 10 postscript
figures. Invited talk presented at the Workshop on Physics at the First Muon
Collider and at the Front End of a Muon Collider, Fermilab, November 1997.
Postscript file of complete paper also available from the UW-Madison
Phenomenology preprint archives at
ftp://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1038.ps.Z o
Heavy quark production via supersymmetric interaction at a neutrino factory
We investigate b-quark production in both charged and neutral current
channels through neutrino-nucleon scattering at a neutrino factory, mediated by
the lepton flavour violating interactions present in a supersymmetric theory
with broken R-parity. Using values of the effctive interaction strengths well
below the current and projected experimental bounds, we are still able to
predict markedly enhanced event rates, especially for the neutral current
events which are not allowed at the lowest order in the standard model (SM).
Data from neutrino factories can therefore be used to probe strengths of such
interactions to considerably higher precision than what can be envisioned in
other experiments.Comment: Few typos are corrected in this versio
Lepton Flavor Violating Era of Neutrino Physics
The physics agenda for future long-baseline neutrino oscillation experiments
is outlined and the prospects for accomplishing those goals at future neutrino
facilities are considered. Neutrino factories can deliver better reach in the
mixing and mass-squared parameters but conventional super-beams with large
water or liquid argon detectors can probe regions of the parameter space that
could prove to be interesting.Comment: 12 pages, Latex, uses sprocl.sty and epsf.sty. 5 postscript figures.
Talk presented at Joint U.S./Japan Workshop On New Initiatives In Lepton
Flavor Violation and Neutrino Oscillation With High Intense Muon and Neutrino
Sources, Honolulu, Hawaii, October 200
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