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Allison Renae Mc Carn
(University of Michigan (US))
04/08/2015, 14:00
While the Standard Model has proven very successful in describing particle interactions, several unanswered questions still remain. Alternative models, such as those with an extended Higgs sector, can be consistent with current observations and answer some of these questions. In the class of models with extended Higgs sectors known as Two-Higgs-doublet models, five physical Higgs bosons are...
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Sven Dildick
(Texas A & M University (US))
04/08/2015, 14:15
New light bosons that couple weakly to the standard model (SM) are predicted in various extensions of the standard model (BSM). Examples include supersymmetric (SUSY) theories with extended Higgs sectors (NMSSM) or with a hidden valleys (dark SUSY). In these models the light bosons can be produced directly in the decay of a Higgs boson, or as part of the decay chain of SUSY particles....
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Laser Seymour Kaplan
(University of Wisconsin (US))
04/08/2015, 14:30
This talk presents searches in ATLAS for a heavy Higgs boson decays to ZZ diboson with four different experimental final states: four charged leptons, two charged leptons and missing transverse energy, two charged leptons and two jets, and two jets and missing transverse energy. The analyses use 20.3 fb^-1 of proton-proton collision data at sqrt(s) = 8 TeV. Results are interpreted in a...
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Benjamin Eric Kaplan
(New York University (US))
04/08/2015, 14:45
We present a search for the exotic decay of the SM-like Higgs boson (h), or the production of a second CP-even Higgs boson (H) decaying to a pair of neutral pseudoscalar Higgs bosons (a), in the next-to-minimal supersymmetric standard model (NMSSM), in events with two muons from the decay of one a boson, with the ATLAS detector in 20.3 /fb of √s = 8...
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Allison Renae Mc Carn
(University of Michigan (US))
04/08/2015, 15:00
While the Standard Model has proven very successful in describing particle interactions, several unanswered questions still remain. Alternative models, such as those with an extended Higgs sector, can be consistent with current observations and answer some of these questions. This talk presents a search for a heavy, CP-odd Higgs boson, A, decaying into a Z boson and a 125 GeV Higgs boson, h,...
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Ms
Deepanjali Goswami
(Indian Institute of Technology Guwahati, INDIA)
04/08/2015, 15:15
We investigated the signature of heavy fermionic triplets belonging to Type III seesaw model through their direct production at the International Linear Collider (ILC). In particular we looked into the decay distributions of charged ($\Sigma^{\pm}$) and neutral ($\Sigma^{0}$) triplets in the processes $e^{+} e^{-} \rightarrow \Sigma^{+}\Sigma^{-}, \Sigma^{0} \Sigma^{0}, \Sigma^{0}\nu,...
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Pawandeep S Jandir
(University of California Riverside (US))
04/08/2015, 16:00
We present a method for predicting the Quantum Chromodynamics (QCD) background in a search for Supersymmetry (SUSY) at the Compact Muon Solenoid (CMS) experiment based on events with large missing energy, large hadronic activity and zero or more identified bottom quark jets. This signature arises in so-called natural SUSY models and is expected to be accessible at the center-of-mass energy of...
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Jamie Antonelli
(The Ohio State University (US))
04/08/2015, 16:15
A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at sqrt(8) TeV. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.7 /fb. Events are selected with an electron and muon with opposite charges that both have transverse impact parameter values between 0.02 and 2...
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Carlos Andres Florez Bustos
(Universidad de los Andes (CO))
04/08/2015, 16:30
Vector Boson Fusion (VBF) tagging is an interesting
and promising new avenue to probe difficult models such as the compressed electroweak and
colored spectra scenarios in supersymmetry (SUSY). A search of SUSY using the VBF topology is presented using 19.7 fb-1
of data from pp collisions at 8 TeV collected by the CMS detector. Focus is placed on SUSY models that have significant branching...
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Evelyn Jean Thomson
(University of Pennsylvania (US))
04/08/2015, 16:45
A search is presented for direct scalar top pair production, where the scalar tops decay via an R-parity-violating coupling to a final state with two leptons and two identified b jets. The analysis uses 20.3 fb−1 of sqrt(s)= 8 TeV proton-proton collision data collected with the ATLAS detector at the LHC. No significant excess is observed over the Standard Model background. Assuming a...
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Sadia Khalil
(Kansas State University (US))
04/08/2015, 17:00
Unlike the most traditional SUSY searches, there exist many SUSY models that do not produce large missing transverse momentum (MET), such as compressed spectra, long live particles, stealth SUSY, and R-parity violating (RPV) models. Searches for RPV model via the LQD couplings have been performed at CMS experiment, using LHC Run I data, in event signatures of two opposite sign same flavor...
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Stefania Gori
04/08/2015, 17:15
Although the LHC experiments have put strong limits on coloured supersymmetric states, it is still possible that electroweakly interacting supersymmetric particles have masses in the range 100-200 GeV. Even outside of supersymmetry, candidates for the particle of dark matter may have masses in this range unconstrained by LHC data. In e+e- annihilation, the low backgrounds, precise knowledge of...
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Mr
Bob Zheng
(University of Michigan)
04/08/2015, 17:30
If Supersymmetry is realized in nature, there are both theoretical and phenomenological reasons to believe that the masses of scalar superpartners to the quarks (squarks) lie in the tens of TeV range. This renders squark pair production kinematically out of reach for both LHC-14 and 100 TeV future hadron colliders. In this talk, I will instead discuss the associated production of a heavy...
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Yanlin Liu
(Univ. of Michigan (US) / Univ. of Sci. & Tech. of China (CN))
04/08/2015, 17:45
I will report the physics potential for a search for a new, non-Standard Model gauge boson, Z’, in its decay to the dimuon final state in Run 2 of the Large Hadron Collider, using the ATLAS detector. Detection of high transverse momentum muons is crucial for the search. A first look at the performance of high transverse momentum muons using early Run 2 data at 13 TeV center-of-mass energy...
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Daniel Hayden
(Michigan State University (US))
04/08/2015, 18:00
With the increase of centre of mass energy from 8 to 13 TeV, Run-2 at the LHC is a very exciting time for searches beyond the standard model. The search for resonant and non-resonant new phenomena in the dilepton channel has the potential to make a discovery very quickly during this period. This talk presents a very first look at 13 TeV data, using the Run-2 event selection for this search,...
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David Norvil Brown
(University of Louisville (US))
05/08/2015, 14:00
We present a search for a dark photon (A'), a new light gauge boson introduced by dark sector models, using data collected by the BABAR experiment. The dark photon is identified through its decay into a lepton pair in the reaction e+e- -> gamma A', A' -> l+l- (l=e,mu). We observe no statistically significant signal, and we set 90% confidence level upper limits on the mixing strength between...
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Alexandre Beaulieu
(University of Victoria)
05/08/2015, 14:15
We report on a search for a new pi0-like particle produced in association with a tau-lepton pair at BABAR.
These objects, with similar masses and decay modes to neutral pions, could provide an explanation
for the apparent non-asymptotic behavior of the pion-photon transition form factor observed by BABAR.
No significant signal is observed, and limits on the production cross sections are...
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Richard Kass
(Ohio State University (US))
05/08/2015, 14:30
We present a search for a light CP-odd Higgs boson (A0) in Upsilon(1S) -> gamma A0, A0 -> ccbar decays. The Upsilon(1S) mesons are selected via the dipion transition Upsilon(2S) -> pi+pi- Upsilon(1S), and the A0 -> ccbar final state is tagged through the reconstruction of various D(*) mesons. No significant signal is observed, and limits on the product branching fraction B(Upsilon(1S) -> gamma...
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Richard Kass
(Ohio State University (US))
05/08/2015, 14:45
We present a search for neutral, long-lived particles produced in e+e- collisions or neutral B meson decays with the BABAR experiment. These particles are identified through their displaced decays into various flavor combinations of two oppositely charged tracks. No significant excesses in the two-track mass distributions are observed, and limits on the product of the production cross-section,...
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Dr
James Mott
(Boston University)
05/08/2015, 15:00
The anomalous magnetic dipole moment of the muon can be both measured and computed to very high precision, making it a powerful probe to test the standard model and search for new physics such as SUSY. The previous measurement by the Brookhaven E821 experiment found a discrepancy from the predicted value with over a 3 standard deviation significance. The new g-2 experiment at Fermilab will...
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Joseph Grange
(Argonne National Laboratory)
05/08/2015, 15:15
The muon g-2 experiment will test one of the strongest existing hints for new physics by measuring the anomalous magnetic moment of the muon with a precision of 140 parts per billion. In order to reach this challenging goal the magnetic field permeating the storage volume must be shimmed and measured with great detail. The magnetic field has very recently been excited for the first time in...
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Mr
Prajwal Mohanmurthy
(MIT)
05/08/2015, 16:00
In the recent times, test of Lorentz Invariance has been used as a means to probe theories of physics Beyond the Standard Model, especially those such as extensions to String Theory and Quantum Gravity. The announcement of the discovery of primordial gravitational waves by the BICEP2 collaboration, points to a possibility of gravity being quantized. Therefore tests of Lorentz invariance could...
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Zhirui Xu
(Ecole Polytechnique Federale de Lausanne (CH))
05/08/2015, 16:15
The LHCb experiment has performed during Run-I of the LHC several studies sensitive to physics that may affect, among other observables, the polarisation of the emitted photon and the branching fractions of several decay modes.
In this talk, the latest results on radiative decays are presented, which access different sources of physics BSM: on one side, the branching fraction of the $B_s^0\to...
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Lashkar Kashif
(University of Wisconsin)
06/08/2015, 14:00
Mono-objects produced in association with large missing transverse momentum (MET) enable fairly model-independent searches for dark matter candidates. Following the discovery of a Higgs boson near 125 GeV, mono-Higgs channels provide very interesting final states for dark matter search. This talk presents an analysis in the H -> two photons + MET final state in ATLAS using 20 fb-1 of 8 TeV...
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Yangyang Cheng
(University of Chicago (US))
06/08/2015, 14:15
This talk will present a search for dark matter pairs produced in association with a Higgs boson decaying into two bottom quarks at the LHC, based on 20 fb−1 of pp collision data collected by the ATLAS experiment at 8 TeV. Events with large missing transverse momentum are selected when produced in association with high momentum jets, of which at least two are identified as jets containing...
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Mr
Andrea Mauri
(University of Zurich)
06/08/2015, 14:30
There is strong evidence that the Standard Model of particle physics is
incomplete. The lack of evidence for any new particles had renewed
interest in theories postulating the existence of a Dark Sector. The
precise manifestation of these particles is entirely unknown, but at low
masses a dominant decay channel would be into a dimuon pair. To that
end, a search for a dark sector...
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Preema Rennee Pais
(University of Massachusetts (US))
06/08/2015, 14:45
Many new physics models predict the existence of neutral, weakly interacting, long-lived particles that could decay within the detector volume, producing a distinctive experimental signature. Results are presented for a search for these particles, using techniques for reconstructing displaced decays to hadronic jets in the inner tracking detector and muon spectrometer. The search is performed...
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Toyoko Orimoto
(Northeastern University (US))
06/08/2015, 15:00
With the recent discovery of the Higgs boson at the Large Hadron Collider, the goals of the Compact Muon Solenoid (CMS) Experiment are now focused on probing for new physics beyond the standard model. The final state consisting of a low transverse energy photon and low missing transverse energy (MET), also called the “monophoton” final state, can be used to constrain a variety of extensions of...
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Justin Pilot
(University of California Davis (US))
06/08/2015, 15:15
We present the legacy search for resonant top quark pair production, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 TeV. The search is performed by measuring the invariant mass distribution of the top-quark pair and testing for deviations from the expected Standard Model background. Final states with zero, one or two leptons...
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Wells Wulsin
(Ohio State University (US))
06/08/2015, 16:00
Many scenarios of physics beyond the Standard Model predict exotic phenomena, such as leptoquarks, magnetic monopoles, extra dimensions, and heavy neutrinos. Such phenomena may be identified by various signatures, including a momentum imbalance in the event; a decay displaced from the interaction point; or a resonance of leptons, jets, or photons. This talk presents the results of recent...
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Sarah Louise Jones
(University of Arizona (US))
06/08/2015, 16:15
Vector-like quarks are predicted in several beyond the Standard
Model theories. In some models, there is strong coupling to third
generation quarks and the vector-like heavy quarks, T and B, can decay into
several different channels involving third generation quarks. We search for
vector-like quarks using events that have two leptons
of the same charge and $\ge$ 1 b-jet. The prospects...
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Robert Stringer
(University of Kansas (US))
06/08/2015, 16:30
Vector-Like Quarks (VLQs) appear in many models of new physics. Unlike SM chiral quarks, which only have left-handed charged currents, VLQs have both right and left-handed charged currents while still transforming the same way under SM gauge groups. Searches were performed during the LHC Run I for the VLQ partners of the top and bottom quarks, the T’ and B’. The T’ and B’ are pair-produced and...
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K.C. Kong
(University of Kansas)
06/08/2015, 16:45
We investigate the collider phenomenology of a color-singlet vector resonance, which couples to the heaviest quarks, the top quarks, but very weakly to the rest of the fermions in the Standard Model. We find that the dominant production of such a resonance does not appear at the tree level -- it rather occurs at the one-loop level in association with an extra jet. Signatures like t anti-t plus...
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Nathan Rogers Bernard
(University of Massachusetts (US))
06/08/2015, 17:00
Models postulating extra spatial dimensions, in which only the gravitational field propagates, address the long-standing hierarchy between the electroweak scale and the gravitational (Planck) scale. Most of these models allow the production of non-perturbative gravitational states, such as micro black holes and string balls, at Large Hadron Collider collision energies. Searches for such states...
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Wells Wulsin
(Ohio State University (US))
06/08/2015, 17:15
We present a search for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. Disappearing tracks are identified as those with little or no associated calorimeter energy deposits and with missing hits in the outer layers of the tracker. The search uses proton-proton collision data recorded at sqrt(s) = 8TeV that corresponds to an...
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Andrew Mc Rae Chegwidden
(Michigan State University (US))
06/08/2015, 17:30
This beyond the Standard Model search looks for events where single top quarks are produced in association with missing transverse energy. This missing transverse energy can be attributed to a neutral, long lived or stable, non-interacting particle which could be considered a dark matter candidate. The final state topology can either be created via baryon number violating or flavor changing...
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Christopher Willis
(Michigan State University (US))
06/08/2015, 17:45
Many beyond the Standard Model Physics scenarios searched for at the LHC predict the existence of new force mediating Gauge Bosons, often termed resonances, such as the Z' and W' Traditionally searches for resonances have relied on the Invariant Mass and Transverse Mass as the discriminating search variables; however, the inclusive lepton pT spectrum offers a unique way to search for both...
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Jared Evans
06/08/2015, 18:00
I will discuss several important gaps in LHC coverage for signatures of new physics beyond the standard model. While many of these signatures involve exotic objects, others with be composed entirely of prompt standard detector objects. Special focus will be given for signatures that emerge generically in broad classes of models. This talk will cover both opportunities for existing coverage...
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Dr
Florian Lyonnet
(LPSC)
07/08/2015, 14:00
In light of the conspicuous absence of SUSY in the energy range explored by the LHC during run I, non-supersymmetric BSM scenarios are becoming more and more attractive. One key ingredient in exploring such BSM physics are the renormalization group equations (RGEs) that are essential for extrapolating the theory to higher energy scales. Although the 2-loop RGEs for a general quantum field...
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Zhen Liu
07/08/2015, 14:20
Supersymmetry searches at the LHC are both highly varied and highly constraining, but the vast majority are focused on cases where the final-stage visible decays are prompt. Scenarios featuring superparticles with detector-scale lifetimes have therefore remained a tantalizing possibility for sub-TeV SUSY, since explicit limits are relatively sparse. Nonetheless, the extremely low backgrounds...
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Dr
Nausheen Shah
(University of Michigan)
07/08/2015, 14:40
The close to SM-like nature of the observed 125 GeV Higgs leads very naturally to a light extended Higgs sector in the Z3 NMSSM. I will explore the very rich phenomenology of this model and highlight specific search channels of interest for the 14 TeV LHC.
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Satyanarayan Nandi
(Oklahoma State University)
07/08/2015, 15:00
Non-minimal universal extra dimensions (nmUED) involve the choice of boundary localized kinetic terms (BLKT) for the 5 dimensional gauge bosons and fermions. We find that with suitable choice of these parameters needed to explain the current Higgs data, the BLK terms removes the approximate degeneracy of the KK mass spectrum, and the pair productions of the level-1 quarks and gluons give rise...
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Pawin Ittisamai
(Michigan State University)
07/08/2015, 16:00
A vector resonance decaying to dijets could be discovered at the 14 TeV run of the LHC. To quickly identify its color structure in a model-independent manner, we introduce a method based on the color discriminant variable, determined from the measurements of the resonance's dijet cross section, mass and width. This talk illustrates how the cross section measurements of the resonance's...
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Prof.
Aaron Pierce
(University of Michigan)
07/08/2015, 16:20
We present a simplified dark matter model where a Majorana fermion χ coannihilates with a colored scalar top partner t˜. We explore the cosmological history, with particular emphasis on the most relevant low-energy parameters: the mass splitting between the dark matter and the coannihilator, and the Yukawa coupling that connects these fields to the Standard Model top quarks. We also allow a...
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Zhen Liu
07/08/2015, 16:40
New physics beyond the Standard Model could give rise to modifications of the Higgs couplings properly described in an effective field theory approach. With respect to the SM gauge symmetry, such effects are expressed by dimension-six or higher operators after integrating out heavy particles or loop functions. The operators modifying Higgs to ZZ couplings are naturally of particular interest....
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Bibhushan Shakya
(MCTP)
07/08/2015, 17:00
The Higgs boson mass of 125 GeV is suggestive of superpartners at the PeV scale. This talk discusses how new physics at this scale can also produce active neutrino masses via a modified, low energy seesaw mechanism and provide a sterile neutrino dark matter candidate with keV-GeV scale mass. Possible connections to the 3.5 keV X-ray line and the PeV neutrino events at IceCube will also be discussed.
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