Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session E11: Beyond-Standard-Model Searches I |
Hide Abstracts |
Sponsoring Units: DPF Chair: JoAnne Hewett, SLAC Room: Roosevelt 3 |
Saturday, January 28, 2017 3:30PM - 3:42PM |
E11.00001: Study of Vector-Like Quarks Using Dilepton and Trilepton + b-Jets Events in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector Sarah Jones A search for physics beyond the Standard Model is presented using dilepton and trilepton events with at least one $b$ jet and large missing transverse energy. Some models looking for beyond the Standard Model physics predict Vector-Like Quarks (VLQ), which can potentially produce these types of events. VLQ are theorized to be non-supersymmetric massive quarks that can couple to top and bottom quarks. The analysis is presented with emphasis on the VLQ search, even though multiple signals are studied in this analysis. [Preview Abstract] |
Saturday, January 28, 2017 3:42PM - 3:54PM |
E11.00002: Duration of classicality in highly degenerate interacting Bosonic system Elisa Todarello, Pierre Sikivie We study sets of oscillators that have high quantum occupancy and that interact by exchanging quanta. It is shown by analytical arguments and numerical simulations that such systems obey classical equations of motion only on timescales of order their relaxation time $\tau$ and not longer than that. The results are relevant to the cosmology of axions and axion-like particles. [Preview Abstract] |
Saturday, January 28, 2017 3:54PM - 4:06PM |
E11.00003: Search for Light Higgs and Low Mass Dark Matter at Belle Ilsoo Seong We report a search for a light CP-odd Higgs boson $A^{0}$, which can be produced in $\Upsilon$ transitions and decay to low mass Dark Matter (DM). We search for evidence of on-shell and off-shell production of the light Higgs in $\Upsilon$(1S) decays via tagged dipion transitions from $\Upsilon$(2S) to $\Upsilon$(1S). We present the first Belle search for final states with a single high energy photon and missing energy in the mass range M$_{A^{0}}\leq$ 9.2 GeV and M$_{\text{DM}}\leq$ 4.5 GeV with a data sample of 157.3 $\times$ 10$^{6}$ $\Upsilon$(2S) decays. We also discuss the implications of our results for direct dark matter searches. [Preview Abstract] |
Saturday, January 28, 2017 4:06PM - 4:18PM |
E11.00004: Background estimation methods and exclusion limits for scalar top-quark production with top quark tagging in the all-hadronic channel at 13 TeV with the CMS detector Hua Wei Discussed will be estimations of the Z to NuNu and QCD backgrounds with in the search for supersymmetry in all-hadronic events with missing transverse momentum using top quark tagging. This will be done for the 2016 proton-proton running period at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The exclusion limits are set on the masses of potential new particles in the context of three simplified models, T1tttt, T2tt and T5ttcc. [Preview Abstract] |
Saturday, January 28, 2017 4:18PM - 4:30PM |
E11.00005: Search for new resonances in the $ ZV \rightarrow \nu\nu qq $ final state in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector Yicheng Guo I will report a search for heavy resonances beyond the standard model decaying into a ZV (V = Z, W) diboson pair with a final state of dijet (decay from V) plus missing transverse energy ($E_T^{miss}$) due to $Z\rightarrow \nu \nu$. Data used in this analysis is from proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=$ 13 TeV from the Large Hadron Collider, and recorded by the ATLAS detector. The mass range in the search is from 500 to 5000 GeV. In this mass range the hadronically-decaying vector boson is reconstructed using boosted-jet techniques. No resonance is observed in data. In the absence of a deviation from the Standard Model expectation, upper bounds on the new resonance production cross sections times their decay branching ratios to ZV pairs are derived within the context of Standard Model extensions with an extended Higgs sector, a heavy vector triplet and warped extra dimensions. [Preview Abstract] |
Saturday, January 28, 2017 4:30PM - 4:42PM |
E11.00006: Distinguishing Standard Model Extensions using MonoTop Chirality at the LHC Ryan Mueller, Rouzbeh Allahverdi, Mykhailo Dalchenko, Bhaskar Dutta, Andrés Flórez, Yu Gao, Teruki Kamon, Nikolay Kolev, Manuel Segura Spectral analysis of the top quark final states is a promising method to distinguish physics beyond the standard model (BSM) from the SM. Many BSM physics with top quark final states feature top quarks with right or left handed polarized helicity. The energy spectrum of the top quark decay products can be used to distinguish the top quark helicity. A Delphes simulation of a minimal standard model extension featuring a color scalar triplet that decays into a left handed top and a dark matter (DM) candidate is compared with a right handed model to demonstrate how such an energy spectrum varies and differentiates models. Both the hadronic and leptonic decay channels of the top quark are considered in the analysis. In the hadronic channel the right and left handed models are separated at 95\% CL with a production cross section of 20 fb and 100 fb$^{-1}$ integrated luminosity of 13 TeV proton-proton collisions at the LHC. [Preview Abstract] |
Saturday, January 28, 2017 4:42PM - 4:54PM |
E11.00007: Search for Contact Interactions in Dilepton Final State in the CMS Experiment: Generator-Level Studies Shawn Zaleski A set of contact interaction (CI) Monte Carlo events, for which Standard Model Drell-Yan events are background, are generated using a leading-order parton-shower generator, Pythia8. We consider three isoscalar models with three different helicity structures, left-left (LL), left-right/right-left (LR), and rightright (RR), each with destructive and constructive interference. . For each of these models, 150,000 events are generated for analysis of CI interactions in the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) with a centre of mass energy of 13 TeV. This study is a generator level study, and detector effects are accounted for by application of kinematic cuts on the generator-level quantities rather than application of a detailed detector simulation package (e.g. GEANT). Distributions of dilepton invariant mass, Collins-Soper angle, and the forward-backward asymmetry are compared with those arising from pure Drell-Yan events. [Preview Abstract] |
Saturday, January 28, 2017 4:54PM - 5:06PM |
E11.00008: Search for light pseudoscalar Higgs bosons in 2HDM using 13 TeV LHC Data Kyle Tos A search for a light pseudoscalar higgs boson (a1) is performed within the framework of two higgs doublet model extensions of the standard model. Using the 2016 LHC data collected at sqrt{s} = 13 TeV by the CMS experiment, this search looks for gg -> H -> a1a1 -> µµττ , where H can be the 125 GeV state or a heavier state. Due to the large mass difference between the H and the a1, the two τ's will be highly boosted and collimated, failing the standard CMS tau reconstruction algorithm. Therefore, we devise a dedicated di-tau technique to increase reconstruction efficiencies, particularly at ΔR{ττ} < 0.5. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700