Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session J17: Exotic Particle Searches |
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Sponsoring Units: DPF Chair: Jesse Thaler, Massachusetts Institute of Technology Room: 251E |
Sunday, April 17, 2016 10:45AM - 10:57AM |
J17.00001: Search for heavy top quark partners with charge 5e/3 in the single lepton final state Sinan Sagir A search is presented for a very heavy fermionic partner of the top quark with charge 5e/3 ($X_{5/3}$), which is expected to decay into a top quark and a W boson. Events consistent with pair production of $X_{5/3}$, where one of the four W bosons from the decays of $X_{5/3}$ and top quarks decays leptonically, and all the other W bosons decay hadronically, are analyzed. The results from this semi-leptonic final state are then combined with same-sign dileptons signature to enhance the sensitivity. No excess of data above SM expectations is observed and 95$\%$ CL upper limits on the $X_{5/3}$ production cross section are set using the data corresponding to an integrated luminosity of 2.2 $fb^{-1}$ collected by the CMS detector at center-of-mass energy of 13 TeV. [Preview Abstract] |
Sunday, April 17, 2016 10:57AM - 11:09AM |
J17.00002: Seesaw Search with Multilepton Final States using $2.1\,\textrm{fb}^{-1}$ of 13 TeV LHC Data Peter Thomassen Results of a search for Seesaw Type-III heavy fermions in final states with at least three charged leptons are presented. The data sample corresponds to $2.1\,\textrm{fb}^{-1}$ of integrated luminosity in proton--proton collisions at $\sqrt{s} = 13\,\textrm{TeV}$ collected by the CMS experiment at the LHC. Data is binned in exclusive channels by categorizing in various quantities like the number of leptons, missing transverse energy, or whether the event properties are consistent with the production of a Z boson. [Preview Abstract] |
Sunday, April 17, 2016 11:09AM - 11:21AM |
J17.00003: Search for new phenomena in dijet angular distributions in proton-proton collisions at sqrt(s) $=$ 13~TeV measured with the ATLAS Detector. Meghan Frate A search for new non-resonant phenomena produced in LHC proton-proton collisions with the first 3.6 fb-1 of data collected at center-of-mass energy 13 TeV has been performed with the ATLAS detector. The angular distribution of the two highest transverse momentum jets, derived from the rapidity of the two jets, has been studied and compared against Standard Model QCD background. This distribution has been found to be consistent with the predictions of the Standard Model. In the presence of no new phenomena, we have been able to set limits on both quantum black hole (QBH) and contact interaction models. At 95{\%} CL, we exclude quantum black holes with threshold masses below 8.1 TeV and 7.9 TeV in two different modeling scenarios, and we exclude contact interactions with a compositeness scale below 12.0 TeV and 17.5 TeV respectively for destructive and constructive interference between the new interactions and QCD processes. These results greatly surpass the current limits on both QBH scenarios and contact interactions, with previous limits on quantum black hole masses in the same models found to be 5.6 TeV and 5.7 TeV, and limits on contact interaction compositeness scale below 8.1 TeV and 12.0 TeV for destructive and constructive interference. [Preview Abstract] |
Sunday, April 17, 2016 11:21AM - 11:33AM |
J17.00004: Search for new, long-lived, charged particles using ionization in the ATLAS Pixel Detector Bradley Axen Several extensions of the Standard Model predict the existence of charged, very massive, and long-lived particles. Because of their high masses these particles would propagate non-relativistically through the ATLAS pixel detector and are therefore be identifiable through a measurement of large specific energy loss. Measuring heavy, long-lived particles through their track parameters in the pixel detector allows sensitivity to particles with lifetimes in the nanosecond range and above. This search presents an inner detector driven method for identifying such particles in proton-proton collisions at 13 TeV with the 2015 dataset corresponding to an integrated luminosity of 3.5 pb$^{-1}$. [Preview Abstract] |
Sunday, April 17, 2016 11:33AM - 11:45AM |
J17.00005: Search for New Physics in Dielectron Final States Using the ATLAS Detector in Run 2 of the Large Hadron Collider Christopher Willis A search for Physics beyond the Standard Model is described for new resonant phenomena in Dielectron final states. The dataset used comes from the first exposure of the LHC to 2015 Run 2 data of $3.2$ fb$^{-1}$ at $\sqrt{s} = 13$ TeV, as recorded by the ATLAS detector. The Dielectron invariant mass spectrum is the discriminating search variable. The current results will be presented along with prospects for the rest of Run 2. [Preview Abstract] |
Sunday, April 17, 2016 11:45AM - 11:57AM |
J17.00006: Search for $t \bar{t}$ Resonaces in Run 2 of ATLAS Hannah Carson, Ken Johns, Ruchika Nayyar, Jason Veatch The status of the search for $t \bar{t}$resonances in Run 2 of ATLAS is presented. The analysis uses data selected using the lepton plus jets decay channel. Hadronically decaying top quarks are selected either by using three small-radius jets (resolved reconstruction) or one large-radius jet (boosted reconstruction). We also investigate the use of semi-boosted reconstruction to increase statistics in the search. In this case, two of the three quarks from the hadronically decaying top quark are contained in a large-radius jet while the third is identified by a small-radius jet. [Preview Abstract] |
Sunday, April 17, 2016 11:57AM - 12:09PM |
J17.00007: Searching for heavy resonances at ATLAS using b tagged jets Soo Ryu Several models beyond the Standard Model predict heavy particles preferentially decaying to bb or bg. This talk presents the searches for narrow resonances in invariant mass spectra of single and double-b tagged jets, using pp collision data corresponding to an integrated luminosity of 3.3 fb-1 at sqrt(s) $=$ 13 TeV. The upper limit at 95{\%} confidence level limits have been set for the Z' and b*. [Preview Abstract] |
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