1,312 research outputs found
CDF Searches for New Phenomena
We present results of recent searches for new physics using the CDF detector
at the Fermilab Tevatron. Presented are searches for Higgs -> gammagamma, as
well as more general searches in gammagamma + X where X is missing Et, jets,
charged leptons, b-quarks or extra photons. The CDF eegammagamma-mett candidate
event is discussed along with estimates of the expected rates in the Standard
Model. Other searches for SUSY, Higgs and Technicolor look for particles which
decay to vector bosons and b-quarks.Comment: 14 Page
Prospects of a Search for Neutral, Long-Lived Particles using Photon Timing at CDF
We present the prospects of searches for neutral, long-lived particles which
decay to photons using their time of arrival measured with a newly installed
EMTiming system at CDF. Using GMSB
models we estimate the expected 95% confidence level exclusion regions as a
function of the neutralino mass and lifetime. We find that a combination of
single photon and diphoton analyses should allow the Tevatron in run II to
easily extend the exclusion regions from ALEPH at LEP II, and cover parts of
the theoretically favored < few keV/c^2 GMSB parameter space.Comment: 3 pages, 3 figures; Proceedings for the DPF2004 Conferenc
Cosmo-Particle Searches for Supersymmetry at the Collider Detector at Fermilab
Some theories of particle physics are so compelling that it is worth doing a
comprehensive and systematic set of experimental searches to see if they are
realized in nature. Supersymmetry is one such theory. This review focuses on
the motivation for a broad set of cosmology-inspired search strategies at the
Tevatron and on their implementation and results at the Collider Detector at
Fermilab (CDF) with the first few fb of integrated luminosity of data.Comment: 15 Pages, 23 figure
Run II Searches for Supersymmetry
In these proceedings, we present all of the Run II results in the search for
Supersymmetry from the Tevatron. At the time of presentation ~200 pb-1 of Run
II data had been analyzed for the presence of new physics. We summarize
searches for CHAMPS, Squarks and Gluinos in the jets+Missing Transverse Energy
(MET) final state, multiple dilepton final state analyses including B_s=>mumu,
RPV Sneutrinos and Chargino/Neutralino production, and conclude with GMSB
searches in the two photon + Met final state. While there is no evidence of new
physics, we do note some interesting events and modest excesses for future
reference as more data comes in. In many cases, the limits presented are the
worlds first or most stringent.Comment: 10 Pages. Proceedings of Hadron Collider Physics 2004 (HCP 2004
On the Forward-Backward Asymmetry of Leptonic Decays of at the Fermilab Tevatron
We report on a study of the measurement techniques used to determine the
leptonic forward-backward asymmetry of top anti-top quark pairs in Tevatron
experiments with a proton anti-proton initial state. Recently it was shown that
a fit of the differential asymmetry as a function of (where
is the charge of the lepton from the cascade decay of the top quarks
and is the final pseudorapidity of the lepton in the detector frame)
to a hyperbolic tangent function can be used to extrapolate to the full
leptonic asymmetry. We find this empirical method to well reproduce the results
from current experiments, and present arguments as to why this is the case. We
also introduce two more models, based on Gaussian functions, that better model
the distribution. With our better understanding, we find that
the asymmetry is mainly determined by the shift of the mean of the
distribution, the main contribution to the inclusive asymmetry
comes from the region around , and the extrapolation from
the detector-covered region to the inclusive asymmetry is stable via a
multiplicative scale factor, giving us confidence in the previously reported
experimental results.Comment: 26 pages, 12 figure
Cosmology and Dark Matter at the LHC
We examine the question of whether neutralinos produced at the LHC can be
shown to be the particles making up the astronomically observed dark matter. If
the WIMP alllowed region lies in the SUGRA coannihilation region, then a strong
signal for this would be the unexpected near degeneracy of the stau and
neutralino i.e., a mass difference \Delta M\simeq (5-15) GeV. For the mSUGRA
model we show such a small mass difference can be measured at the LHC using the
signal 3\tau+jet+E_T^{\rm miss}. Two observables, opposite sign minus like sign
pairs and the peak of the \tau\tau mass distribution allows the simultaneous
determination of \Delta M to 15% and the gluino mass M_{\tilde g} to be 6% at
the benchmark point of M_{\tilde g}=850 GeV, A_0=0, \mu>0 with 30 fb^{-1}. With
10 fb^{-1}, \Delta M can be determined to 22% and one can probe the parameter
space up to m_{1/2}=700 GeV with 100 fb^{-1}.Comment: 11 pages, 7 figures, Talk at IDM 2006, 11th September to 16th
September, Greec
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