Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session H11: Beyond-Standard-Model Searches II |
Hide Abstracts |
Sponsoring Units: DPF Chair: Tulika Bose, Boston University Room: Roosevelt 3 |
Sunday, January 29, 2017 8:30AM - 8:42AM |
H11.00001: Study of Lepton Flavor Universality in Semileptonic decays with LHCb Brian Hamilton Semileptonic b-hadron decays to tau leptons provide a powerful probe for a class of new physics models that may have Higgs-like non-universal couplings to the charged leptons. Recent improvements in the measured decay rates in these channels hint at an excess relative to the expected rates in Standard Model calculations. A new development in this area is the emergence of hadron collider measurements with different systematics and backgrounds providing complimentary probes of the same or similar processes. We present the latest progress in these measurements using the LHCb 7 and 8 TeV datasets. [Preview Abstract] |
Sunday, January 29, 2017 8:42AM - 8:54AM |
H11.00002: Searches for leptoquarks in CMS and possibilities for reinterpretation at the LHC David Morse Leptoquarks are hypothetical bosons with fractional electric charge which present a new symmetry between quarks and leptons, as predicted in some BSM models. An overview of the theoretical motivation and present searches for leptoquarks at CMS will be presented, in all three lepton generations. Leptoquark searches also have strong reach for reinterpretation in other theoretical frameworks, particularly R-parity violating supersymmetry. These reinterpretations will be motivated and presented in addition to the above searches. [Preview Abstract] |
Sunday, January 29, 2017 8:54AM - 9:06AM |
H11.00003: Search for a heavy resonance decaying into WZ/ZZ final state in proton-proton collisions at 13 TeV using the CMS detector Kamal Lamichhane Beyond the standard model theories like Extra-Dimensions predict heavy resonances corresponding to a graviton (a spin 2 particle) dominantly decaying to a pair of standard model bosons. We present the search for heavy resonances decaying to a pair of vector bosons ZZ or ZW, where Z decays to a pair of neutrinos, and W or Z decays to a merged jet due to the boost. The search has been performed using a data sample collected with the CMS detector in 2016 and the results will be interpreted in the context of Randall-Sundrum Warped Extra Dimensions model. Since the W or Z decays to a merged jet, jet substructure techniques are utilized for W- and Z-tagging, which results in better signal selection. [Preview Abstract] |
Sunday, January 29, 2017 9:06AM - 9:18AM |
H11.00004: Search for New Phenomena in Dijet Events in $pp$ Collisions at $\sqrt{s}=$ 13 TeV with the ATLAS Detector Benjamin Allen A search for new phenomena produced in LHC proton-proton collisions with data collected during 2015 and 2016 at center-of-mass energy of 13 TeV has been performed with the ATLAS detector. The invariant mass distribution of the two highest transverse momentum jets has been studied and compared against Standard Model QCD background, as well as the angular distribution, derived from the rapidities of the two jets. These distributions have been found to be consistent with the predictions of the Standard Model. In the absence of new phenomena, exclusion limits have been set on a selection of benchmark models, including excited quarks, heavy $W$ bosons, and quantum black holes. [Preview Abstract] |
Sunday, January 29, 2017 9:18AM - 9:30AM |
H11.00005: Search for signatures of Littlest Higgs with T-parity dijet final states with the ATLAS detector Marijus Brazickas {\it The Littlest Higgs model with T-parity} (LHT) is an extension of the Standard Model (SM) at TeV scale. LHT model offers a solution to the naturalness problem of the SM by introducing a set of new TeV-scale particles: T-odd heavy gauge bosons and T-odd heavy quarks that can be produced only in pairs. Under the new symmetry of LHT, due to the implemented parity, all SM fermions and gauge bosons are T-even, while their new heavy partners are T-odd. Besides the heavy T-odd fermion sector LHT introduces a T-even heavy top quark, a partner of T-odd heavy quark, which can mix with a SM top quark. In addition, LHT model predicts a colorless, lightest T-odd stable particle (LTP), a heavy photon ($A_H$), which is a potential candidate for cold dark matter.\\ We are performing a search for effects from the LHT in dijet final states. The analysis involves performing simulations of Higgs events within the ATLAS framework. We are generating Littlest Higgs events with p-p collisions at 14 TeV CM energy using a CalcHep event generator. Validations of generated event samples have been done by analyzing the kinematics of jets in the final states. Following simulation and reconstruction of these validated samples with the ATLAS detector, I will present the expected sensitivity. [Preview Abstract] |
Sunday, January 29, 2017 9:30AM - 9:42AM |
H11.00006: Search for long-lived stopped particles at CMS using 13 TeV data Weifeng Ji The search looks for long-lived BSM particles that could have come at rest within the CMS detector after production and decay later between LHC beam crossings. The decay of BSM particles could be directly observed and the search is sensitive to particles with a lifetime from 1 microsecond to 1000s. The results are interpreted with models that predict long-lived gluinos and top squarks. The latest result of this search will be presented using 2015 and 2016 data. [Preview Abstract] |
Sunday, January 29, 2017 9:42AM - 9:54AM |
H11.00007: Search for pair production of vector-like quarks that decay to a Z boson and a third-generation quark in trilepton final states in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector You Zhou, Elliott Cheu A search is outlined for the pair production of vector-like quarks that decay to a Z boson and a third-generation Standard Model quark. In the case of a charge $+2/3$ vector-like quark ($T$), the decay targeted is $T \rightarrow Zt$, while the decay targeted for a charge $ -1/3$ vector-like quark ($B$) is $B \rightarrow Zb$. Selected events contain a high transverse momentum Z boson candidate reconstructed from a pair of oppositely charged same-flavor leptons (electrons or muons), and are analyzed in the final states defined by the presence of a third lepton. Hadronic jets, in particular those with properties consistent with the decay of a b-hadron, are also required to be present in selected events. The agreement between the simulated data and observed data is examined in various control regions defined by the absence of b-tagged jets and Z boson candidates with low transverse momentum. The expected lower limits are derived on the mass of vector-like $T$ and $B$ quarks considering only the statistical uncertainties under various branching ratio hypotheses. [Preview Abstract] |
Sunday, January 29, 2017 9:54AM - 10:06AM |
H11.00008: Search for the production of a long lived neutral particle which decays hadronically in association with a Z boson in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector Michael Werner Despite the increasing luminosity of the LHC, no new particles beyond the standard model have yet been found by conventional searches. This has led to interest in more exotic signatures of potential new particles. One such exotic signature is a jet without tracks and almost all of its energy deposited in the hadronic calorimeter vs the electromagnetic calorimeter (which lies closer to the beam). A long lived neutral particle that traverses the detector into the HCal before decaying hadronically would produce such a signature. In this talk, I will present a search for such a particle recoiling against a standard model Z boson in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector. [Preview Abstract] |
Sunday, January 29, 2017 10:06AM - 10:18AM |
H11.00009: Spontaneous Breaking of Lie Groups to Discrete Symmetries Bradley Rachlin, Thomas Kephart Many models of beyond Standard Model physics connect flavor symmetry with a discrete group. Having this symmetry arise spontaneously from a gauge theory maintains compatibility with quantum gravity and prevents anomalies. We detail ways to set up Higgs potentials to break gauge groups to discrete symmetries of interest. The scalar mass spectra are examined. [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