Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session F03: Particle Physics I |
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Chair: Vishvas Pandey, University of Florida Room: Holiday Inn Resort Turtlewatch |
Friday, November 8, 2019 10:30AM - 10:42AM |
F03.00001: Search for a Light Pseudoscalar Higgs Boson in the Two Higgs Doublet Model using Data from the Large Hadron Collider (LHC) Redwan Md Habibullah A search is presented for a light pseudoscalar Higgs boson (a) using data collected by the CMS experiment at LHC, at centre-of-mass of energy of 13 TeV. The study looks into the decay Higgs boson (H) via the H$\to $aa$\to \mu \mu \tau \tau $ channel. The Higgs boson can be both standard-model-like (125 GeV) or heavier. The pseudoscalar mass falls within the range m$_{\mathrm{a\thinspace }}\epsilon $[2m$_{\mathrm{\tau }}$,m$_{\mathrm{H}}$/2]. The large mass difference between the Higgs and the pseudoscalar means that the final tau lepton decay products are highly boosted in the decay direction and collimated. A modified version of tau reconstruction is used to account for the highly overlapping decay products. The modified reconstruction technique gives higher reconstruction efficiency over the standard tau reconstruction and hence better signal significance and background rejection. This technique also becomes useful when looking into various final states, especially the ones where one of the taus decays hadronically while the other decays leptonically ($\mu $/e). The performance of the altered reconstruction technique, as opposed to the standard tau reconstruction, is also presented. The results from the 2016 and 2017 CMS datasets will be shown. [Preview Abstract] |
Friday, November 8, 2019 10:42AM - 10:54AM |
F03.00002: Search for Higgsino inside Large Hadron Collider via Vector Boson Fusion Cheng Tao, Alfredo Gurrola, Andres Florez, Nathalia Cardona, Will Johns, Paul Sheldon Supersymmetry (SUSY) is a theoretical extension of the standard model (SM) of particle physics that could describe the particle nature of Dark Matter (DM). In SUSY models assuming R-parity conservation, the lightest neutralino is neutral, stable, and interacts with SM particles in the early universe to give the DM relic density observed today. A Higgs-like neutralino (Higgsino) is known to be a promising candidate for DM. Current search methods for Higgsinos at the LHC mainly rely on Drell-Yan production mechanisms, however, are experimentally difficult in cases where the mass of the DM candidate is only slightly less than the masses of other neutralinos, making these so-called compressed spectrum Higgsino scenarios important search targets using new techniques. The focus of this talk is on the development of a search methodology for Higgsino DM at LHC using Vector Boson Fusion (VBF) processes, which offers an alternative and complementary search strategy. We combine the VBF topology with a final state of one and two soft leptons and large missing momentum. The requirement of one or two soft leptons combined with jets of large dijet mass can significantly reduce SM backgrounds, resulting in enhanced Higgsino discovery potential at the LHC. [Preview Abstract] |
Friday, November 8, 2019 10:54AM - 11:06AM |
F03.00003: Search for Six-Quark State at BABAR Experiment Romulus Godang Six-quark combination uuddss are allowed by Quantum Chromodynamics (QCD). It could be deeply bound state that has eluded detection. The stable six-Quark state is a potentially Dark Matter candidate. Based on a data sample of 90 million of Upsilon(2S) and 110 million Upsilon(3S) decays collected by the BABAR Experiment. We report the first search for a stable Six-Quark state in the decay of Upsilon to S Lambdabar Lambdabar. These bounds set stringent limits on the existence of such exotic particles. [Preview Abstract] |
Friday, November 8, 2019 11:06AM - 11:18AM |
F03.00004: Unified explanation of $b\rightarrow s\mu\mu$ anomalies, neutrino masses and $B \rightarrow \pi K$ puzzle. John Waite, Alakabha Datta, Divya Sachdeva Anomalies in semileptonic B decays could indicate new physics beyond the standard model (SM). There is an older puzzle in nonleptonic $B \rightarrow \pi K$ decays. The new particles, leptoquarks and diquarks, required to solve the semileptonic and the nonleptonic puzzles can also generate neutrino masses and mixing at loop level. We show that a consistent framework to explain the B anomalies and the neutrino masses is possible and we make predictions for certain rare nonleptonic B decays. [Preview Abstract] |
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