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Kevin Black
(Department of Physics-Boston University)
8/9/11, 2:00โฏPM
Beyond the Standard Model
Parallel contribution
Over the last 30 to 40 years the Standard Model has had remarkable agreement with a large variety of experimental tests. With the large accumulated datasets at the Tevatron and the LHC the TeV scale is now being probed in detail. In this talk we will review the state of searches for physics beyond the Standard Model. In particular, we will focus on the recent results from the LHC which...
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Mr
Samuel Meehan
(University of Chicago)
8/9/11, 2:30โฏPM
Beyond the Standard Model
Parallel contribution
We perform a search for vector-like quarks more massive than the top quark coupling to lighter generations using data collected with the ATLAS detector. The W and Z bosons are reconstructed in the $W\rightarrow l^{\pm}\nu$ and $Z\rightarrow l^{+}l^{-}$ where $l=e,\mu$. The vector-like quark is reconstructed from the W or Z and the highest $p_{T}$ jet.
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Michael Luk
(Brown University)
8/9/11, 2:50โฏPM
Beyond the Standard Model
Parallel contribution
The Standard Model with three generations of quarks describes remarkably well all particle phenomena observed to date. Although adding a fourth generation of massive fermions is an obvious extension of the model, it became less popular ever since the limit on light neutrino flavors, and the precise measurements on the electroweak parameters, seem to disfavor such a possibility. However,...
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Dr
Peter Renkel
(postdoc)
8/9/11, 3:10โฏPM
Beyond the Standard Model
Parallel contribution
We present a model independent search for physics beyond the standard model in lepton final states. We examine data in 120 unique final states from 1.07 fb-1 of at ppbar collisions at sqrt(s) = 1.96 TeV collected with the D0 detector. We conclude that all discrepancies seen can be attributed to modeling issues and do not claim evidence of new physics.
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Sudarshan Paramesvaran
(University of California Riverside)
8/9/11, 4:00โฏPM
Beyond the Standard Model
Parallel contribution
We present the results of searches for Supersymmetry in all-hadronic final states with jets and missing transverse energy, including the cases of jets identified as b-jets, the decay products of top quarks and hadronically decaying tau leptons. The searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various...
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Tapas Sarangi
(University of Wisconsin)
8/9/11, 4:20โฏPM
Beyond the Standard Model
Parallel contribution
We report on searches for supersymmetry in events with one, two or multi-lepton final states with the 2011 data from the ATLAS experiment. In case of no excess observed a 95% CL upper limit is set for squark and gluino masses for different signal models. A 95% CL limit on the cross section times branching ratios times efficiency is set for
different final states under study.
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Benjamin Henry Hooberman
(Fermi National Accelerator Lab. (Fermilab))
8/9/11, 4:40โฏPM
Beyond the Standard Model
Parallel contribution
We present the results of searches for Supersymmetry in various topologies that lead to one or more isolated leptons, jets, and missing transverse energy in the final state. The searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various data-driven techniques used to measure the Standard Model backgrounds are...
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Derek Michael Barge
(Physics Department-Univ. of California Santa Barbara)
8/9/11, 5:00โฏPM
Beyond the Standard Model
Parallel contribution
The results of searches for Supersymmetry in events with two opposite-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use pp collisions at 7 TeV collected in 2011 by the CMS experiment.
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Bart Butler
(SLAC)
8/9/11, 5:20โฏPM
Beyond the Standard Model
Parallel contribution
Results are presented of a search for new physics in events with large
missing transverse energy and heavy flavor jet candidates in โs=7 TeV
proton-proton collisions with the ATLAS detector at the Large Hadron
Collider. Several signal regions corresponding to different regions of
phase space are examined. The results are interpreted in the context of
phenomenological simplified new...
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Hideki Okawa
(UC Irvine)
8/9/11, 5:40โฏPM
Beyond the Standard Model
Parallel contribution
We present the status of interpretations of Supersymmetry searches in
ATLAS using simplified models. Such models allow a systematic scan
through the phase space in the sparticle mass plane, and in the
corresponding final state kinematics. Models at various levels of
simplification have been studied in ATLAS. The results can be
extrapolated to more general new physics models which lead
to...
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Dr
Georgios Choudalakis
(University of Chicago, Enrico Fermi Institute)
8/10/11, 2:00โฏPM
Beyond the Standard Model
Parallel contribution
I present the latest result from the ATLAS search for resonant production of new particles decaying in two jets, using data taken in 2011.
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Mr
Dominick Olivito
(University of Pennsylvania)
8/10/11, 2:20โฏPM
Beyond the Standard Model
Parallel contribution
The ATLAS detector has been used to search for high mass e e or mu mu
resonances, such as new heavy neutral gauge bosons. This talk will
present the latest search results for a high mass state decaying to
dilepton pairs, in proton-proton collisions at a center of mass energy
of 7 TeV at the Large Hadron Collider using data recorded by the ATLAS
experiment in 2011.
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Mr
Evan Wulf
(Columbia University)
8/10/11, 2:40โฏPM
Beyond the Standard Model
Parallel contribution
With a substantial increase in luminosity at the LHC, 2011 is an exciting
time for searches for new physics. The Randall-Sundrum model, in which a
warped extra dimension is introduced to resolve the hierarchy problem, predicts a spectrum of massive excited gravitons. There is significant
potential for discovery of the lightest of these gravitons. The latest
results from the ATLAS...
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Alexey Ferapontov
(Department of Physics-Brown University)
8/10/11, 3:00โฏPM
Beyond the Standard Model
Parallel contribution
Results of searches for Large Extra Dimensions (LED) in pp collisions at the center-of-mass energy of 7 TeV with the CMS detector are presented. Having analyzed the full 2011 dataset, we found no excess of events above the standard model (SM)
expectations. We set stringent limits on the multi dimensional Planck scale as well as masses of exotic objects that are consequences of the LED.
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Yunhe Xie
(Fermilab)
8/10/11, 3:20โฏPM
Beyond the Standard Model
Parallel contribution
We report the result of two searches for final states with either two photons and large missing transverse energy or with a Z boson, a photon and large missing transverse energy, using data collected with the D0 detector at the Fermilab Tevatron collider and corresponding to integrated luminosities of up to 6.3 fb-1. The result of these searches are interpreted in the framework of gauge...
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Duong Hai Nguyen
(Department of Physics-Brown University)
8/10/11, 3:40โฏPM
Beyond the Standard Model
Parallel contribution
We present the results of searches for Supersymmetry in various topologies that lead to final states with jets, missing transverse momentum and one or two photons or a photon and a lepton. These searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various data-driven techniques used to measure the Standard Model...
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Marc Gabriel Weinberg
(Department of Physics-University of Wisconsin)
8/10/11, 4:30โฏPM
Beyond the Standard Model
Parallel contribution
The results of searches for Supersymmetry in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use pp collisions at 7 TeV collected in 2011 by the CMS experiment.
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Mr
Robert Forrest
(UC Davis)
8/10/11, 4:50โฏPM
Beyond the Standard Model
Parallel contribution
We present a search for chargino and neutralino supersymmetric particles yielding same signed dilepton final states including one hadronically decaying tau lepton using 6.0 fb^-1 of data collected by the the CDF II detector. This signature is important in SUSY models where, at high \tan{\beta}, the branching ratio of charginos and neutralinos to tau leptons becomes dominant. We study event...
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Mr
Benjamin Cerio
(Physics Department-Duke University)
8/10/11, 5:10โฏPM
Beyond the Standard Model
Parallel contribution
We present an inclusive search for events with two isolated leptons ($e$ or $\mu$) of the same electric charge in $pp$ collisions at $\sqrt{s}=7$ TeV. The data are selected from events recorded in the ATLAS detector in 2011. With a small Standard Model background, the same sign dilepton signature is a powerful testing ground for new physics. The distributions of kinematical variables are...
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Jason Mansour
(University of Gรถttingen)
8/10/11, 5:30โฏPM
Beyond the Standard Model
Parallel contribution
We present a search for universal extra dimensions (UED) and supersymmetry (SUSY) in the two like-sign muons final state. The data set corresponds to an integrated luminosity of 7.3 fb-1 collected by the D0 detector at a $p\bar{p}$ center of mass energy of 1.96 TeV at the Fermilab Tevatron Collider. No evidence for physics beyond the standard model is observed and limits are set on the size of...
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Sho Maruyama
(Department of Physics-University of California Davis (UCD))
8/10/11, 5:50โฏPM
Beyond the Standard Model
Parallel contribution
A search for physics beyond the Standard Model (SM) is performed using events with at least three leptons and any number of jets. The search is performed in data collected in 2011 by the CMS experiment at the LHC in pp-collisions at a center of mass energy of 7 TeV. Numerous leptonic channels have been investigated in an exclusive manner and data-driven techniques are used to quantify the SM...
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Jeremiah Jet Goodson
(Department of Physics - State University of New York (SUNY))
8/10/11, 6:10โฏPM
Beyond the Standard Model
Parallel contribution
The results of a search for supersymmetry in multilepton final states using the ATLAS detector is presented. Such signals require three or more leptons, jets, and missing transverse energy. This channel provides the advantage that the contribution due to standard model backgrounds is expected to be very low. Results from the 2011 data-taking will be reported.
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Sanjay Ravi Ratan Arora
(Dept. of Physics and Astronomy-Rutgers, State Univ. of New Jers)
8/10/11, 6:30โฏPM
Beyond the Standard Model
Parallel contribution
Anticipating a data sample of the order of hundreds $pb^{-1}$ at a collision energy of 7 TeV by the CMS experiment at LHC in 2011, we probe new physics such as matter symmetry violation in the leptonic sector in theories with partner articles with a signature of three or more leptons in the final state. The search is organized to minimize reliance on specific kinematic variables to reduce SM...
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Sherwin Love
(purdue university)
8/11/11, 10:30โฏAM
Beyond the Standard Model
Parallel contribution
The minimal supersymmetric standard model (MSSM) is extended by the inclusion of an addition pair of constrained Higgs doublet superfields through which the electroweak symmetry breaking is nonlinearly realized. The superpotential coupling to the MSSM Higgs doublet then generates its vacuum expectation value. The resultant Higgs scalars and Higgsino-gaugino mass spectrum is presented for...
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Roman Nevzorov
(University of Hawaii)
8/11/11, 10:50โฏAM
Beyond the Standard Model
Parallel contribution
We consider collider signatures of the exceptional supersymmetric standard model (E6SSM). This model is based on the SM gauge group together with an extra U(1)_{N} gauge symmetry under which
right--handed neutrinos have zero charge. To ensure anomaly cancellation and gauge coupling unification the low energy matter
content of the E6SSM involve three 27 representations of E_6 and a pair of...
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Dr
David Atwood
(Iowa State University)
8/11/11, 11:10โฏAM
Beyond the Standard Model
Parallel contribution
In this talk, I will discuss the production of fourth generation quarks at the LHC. In particular, if such a quark has a mass in the phenomenologically interesting range of 400GeV-600 GeV and decays to a light quark and a W-boson, I will consider a number of possible signals through which it might be detected.
In general, the signals I consider include missing momentum together with jets...
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Ms
Saptaparna Bhattacharya
(Brown University)
8/11/11, 11:30โฏAM
Beyond the Standard Model
Parallel contribution
We explore LHC signatures of vectorlike quarks, which are hypothetical fermions whose left- and right-handed components have the same electroweak quantum numbers. We consider interactions of such a quark, top-prime, with the top quark via a Yukawa coupling and with a bottom quark through a $W$ boson. We look at Higgs production through the decay of the top-prime in a top-prime pair production...
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Mr
Matthew Bishara
(University of Rochester)
8/11/11, 11:50โฏAM
Beyond the Standard Model
Parallel contribution
The Simplest Higgs model is one of several Little Higgs extensions that attempt to address the hierchy problem through expansion of the Standard Model weak sector.
New charged and neutral weak gauge bosons can cancel out the quadratic Higgs divergences in the Higgโs potential through loop diagrams. Production of charged X gauge bosons is studied through gauge boson fusion in pp collisions at...
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Mahsana Ahsan
(Department of Physics-University of Texas at Dallas-Unknown)
8/12/11, 8:00โฏAM
Beyond the Standard Model
Parallel contribution
We will present a search on dark matter particles of nearly GeV scale that decay into highly boosted set of electrons. \ These collimated set of leptons produced in the final state are called lepton-jets. \ The search is motivated by recent observations from astrophysical experiments on the anomalous excess of cosmic ray leptons. \ The analysis is performed using the data collected by the...
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SARAH MALIK
(UNIVERSITY COLLEGE LONDON)
8/12/11, 8:20โฏAM
Beyond the Standard Model
Parallel contribution
A study of events with missing transverse energy plus a single energetic jet using 35 pb$^-1$ of $pp$ collision data at 7 TeV, collected by the CMS detector at LHC is presented. This topolgy is a signature of large extra dimensions in the framework of the ADD model, and the unparticles. The number of observed events is in good agreement with the prediction of the Standard Model. The 95\% CL...
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Tulika Bose
(Boston University)
8/12/11, 8:40โฏAM
Beyond the Standard Model
Parallel contribution
We present the latest results of searches for W' bosons using data collected by the CMS experiment.
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Juliette Alimena
(Department of Physics-Brown University)
8/12/11, 10:30โฏAM
Beyond the Standard Model
Parallel contribution
We report on a search for charged massive long-lived particles (CMLLPs), based on 5.2 fb$^{-1}$ of data collected
with the D0 detector at the Fermilab Tevatron $p\bar{p}$ collider. CMLLPs are predicted in many theories of physics
beyond the Standard Model. We look for events in which one or more particles are reconstructed as muons
but have speed and ionization energy loss $dE/dx$...
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Steve Alkire
(Department of Physics-University of Washington)
8/12/11, 10:50โฏAM
Beyond the Standard Model
Parallel contribution
A number of extensions of the Standard Model result in neutral and weakly-coupled particles that decay to multi hadrons or multi leptons with macroscopic decay lengths. These particles with decay lengths that can be comparable with ATLAS detector dimensions represent, from an experimental point of view, a challenge both for the trigger and for the reconstruction capabilities of the ATLAS...
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Vivek Jain
(Indiana University)
8/12/11, 11:10โฏAM
Beyond the Standard Model
Parallel contribution
The discovery of a new type of a heavy long-lived particle (LLP) would be of fundamental significance, since no such particles exist in the Standard Model. LLPs are anticipated in a wide range of physics models which extend the Standard Model, such as supersymmetry (SUSY) and universal extra dimensions. Since LLPs produced in the 7 TeV pp collisions at the CERN LHC can be slow (beta<<1) and...
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Josh Cogan
(SLAC National Accelerator Laboratory)
8/12/11, 11:30โฏAM
Beyond the Standard Model
Parallel contribution
Massive, long-lived particles (LLP) are predicted in several supersymmetry and beyond the Standard Model scenarios. In some cases these heavy objects, if
produced in 7 TeV pp collisions at the CERN LHC, may lose all of their energy and come to rest within the detector volume. We describe the search for gluino
R-hadrons which have been captured within the ATLAS detector volume, particularly...
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Emanuela Barberis
(Department of Physics-Northeastern University)
8/12/11, 11:50โฏAM
Beyond the Standard Model
Parallel contribution
Leptoquarks are hypothetical particles carrying both lepton and quark flavor. They are predicted by Grand Unified Theories, technicolor and composite models among others. Results from the searches for pair production of first and second generation leptoquarks at the CMS experiment with 7 TeV data are presented.
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Lidija Zivkovic
(Brown University)
8/12/11, 12:10โฏPM
Beyond the Standard Model
Parallel contribution
We present the results of three searches for new physics in ppbar collisions at sqrt(s)=1.96 TeV using up to 5.4 fb-1 of data collected with the D0 detector at the Fermilab Tevatron collider. We search for hypothetical vector-like quarks which decay into a W or a Z boson and one additional jet, for first generation leptoquarks using the final state with two jets, one electron and missing...
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Nathaniel Joseph Pastika
(School of Physics and Astronomy-University of Minnesota)
8/12/11, 4:00โฏPM
Beyond the Standard Model
Parallel contribution
The left-right (LR) symmetric model explains the origin of the parity violation in weak interactions and predicts the existence of additional heavy right-handed W and Z' gauge bosons. In addition, heavy right-handed neutrino states arise naturally within the LR symmetric model. These neutrinos can be partners of light neutrino states, related to their non-zero masses through the see-saw...
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James David Degenhardt
(Department of Physics and Astronomy - University of Pennsylvania)
8/12/11, 4:20โฏPM
Beyond the Standard Model
Parallel contribution
The ATLAS detector has been used to search for high-mass states decaying into a single high momentum lepton and missing energy, such as new heavy charged gauge bosons. Based on proton-proton collisions at a center of mass energy of 7 TeV produced at the Large Hadron Collider, the latest search results for a W' decaying to lepton plus neutrino are presented.
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Gennadiy Kukartsev
(Department of Physics-Brown University)
8/12/11, 4:40โฏPM
Beyond the Standard Model
Parallel contribution
