Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session R09: Visible Dark Photon Searches |
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Sponsoring Units: DPF Chair: Gordan Krnjaic, Fermilab Room: A111 |
Monday, April 16, 2018 10:45AM - 11:21AM |
R09.00001: Dark Matter, Dark Forces, and the GeV-Scale Discovery Frontier Philip Schuster The search for sub-GeV dark matter and new forces with very weak coupling to matter is a new and vibrant frontier in fundamental physics. As an introduction to this field, I will present the theoretical and data-driven motivations for sub-GeV dark matter and new forces, important sensitivity milestones and scenarios, and the most promising experimental strategies to discover this physics. [Preview Abstract] |
Monday, April 16, 2018 11:21AM - 11:45AM |
R09.00002: Dark Photons at LHCb Mike Williams Searches at the LHCb experiment for the proposed dark sector analog of the photon will be presented. LHCb has world-leading sensitivity to various hypothetical vector particles over sizable mass regions, including the dark photon. Planned future upgrades and the resulting physics prospects will also be discussed. [Preview Abstract] |
Monday, April 16, 2018 11:45AM - 12:09PM |
R09.00003: Resonance search results from HPS and Future Prospects Mathew Graham The Heavy Photon Search (HPS) experiment at Jefferson Lab is searching for a new U(1) vector boson (``heavy photon'',``dark photon'' or A$^\prime$) in the mass range of 20-200 MeV/c$^2$. An A$^\prime$ in this mass range is theoretically favorable and may mediate dark matter interactions. In these models, the A$^\prime$ couples to the ordinary photon through kinetic mixing, which induces its coupling to electric charge. Since heavy photons couple to electrons, they can be produced through a process analogous to bremsstrahlung, subsequently decaying to an e+eā pair which can be observed as a narrow resonance above the dominant QED trident background. Using the CEBAF electron beam at Jefferson Lab incident on a thin tungsten target along with a compact, large acceptance forward spectrometer consisting of a silicon vertex tracker and lead tungstate electromagnetic calorimeter, HPS is accessing unexplored regions in the mass-coupling parameter space. The HPS engineering run took place in spring of 2015 using a 1.056 GeV, 50 nA beam and collected 1165 nb$^{ā1}$ (7.29 mC) of data. This talk will present the first results of a resonance search for a heavy photon and prospects for future searches and detector upgrades. [Preview Abstract] |
Monday, April 16, 2018 12:09PM - 12:33PM |
R09.00004: Direct Search for Dark Photons and Dark Higgs with the SeaQuest Spectrometer at Fermilab Sho Uemura, Kun Liu, Ming Liu SeaQuest/E1067 is a direct search for dark sector particles using the SeaQuest spectrometer at Fermilab. The SeaQuest experiment studies nuclear dependent Drell-Yan dimuon production using the high intensity 120~GeV proton beam from the Main Injector on thin fixed targets. An iron-filled magnet downstream of the target, 5 meters in length, serves as the focusing magnet and beam dump. Proton-nucleus collisions, mostly in the beam dump, can produce dark photons and dark Higgs through Drell-Yan like $q+\bar{q}$ (or $g+g$) fusion processes. These will decay to pairs of charged particles that can be detected in the SeaQuest spectrometer. A displaced-vertex trigger was built, installed, and commissioned in 2017. This trigger, which operates parasitically with the primary SeaQuest physics program, is sensitive to dark photons or dark Higgs with mass above the dimuon threshold that travel deep inside the beam dump before decaying. It recorded one week of production data during the last run of the E906 experiment, and will continue to take data during the upcoming E1039 experiment. We present the displaced-vertex trigger upgrade and its performance, the current status of the dark photon search from 2017 data, and projected sensitivity from future running. [Preview Abstract] |
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