Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 60, Number 11
Friday–Saturday, October 16–17, 2015; Tempe, Arizona
Session E7: Particle Physics III |
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Chair: Richard Lebed, Arizona State University Room: MU207 |
Friday, October 16, 2015 3:17PM - 3:41PM |
E7.00001: Supersymmetry and Dark Matter - Status and Outlook Invited Speaker: Pearl Sandick The question of the identity of dark matter is one of the most exciting outstanding puzzles in modern physics. Supersymmetry, which remains an extremely compelling theory of physics beyond the Standard Model, may hold the answer. In this talk, I’ll discuss supersymmetry and supersymmetric dark matter, emphasizing the spectrum of theoretical and phenomenological approaches to evaluating the vast parameter space. I’ll also discuss some different tactics we can use to further our understanding and evaluate the prospects for discovery of supersymmetry and/or dark matter via direct dark matter searches, indirect dark matter searches, and collider experiments. [Preview Abstract] |
Friday, October 16, 2015 3:41PM - 3:53PM |
E7.00002: Gamma-ray signal from SUSY Dark Matter Takahiro Yamamoto, Pearl Sandick, Fei Teng Supersymmetric Standard Model dark matter which consists of weakly interacting massive particles with the mass of $\mathcal{O}$(100) GeV has commonly been thought to be overdense in the current epoch of our Universe due to the chirality suppression of annihilation rate. Recently, however, new bulk region has been suggested to explain the correct dark matter relic density where the relatively light sleptons with the large chiral mixing and $CP$-violating phase can boost the dark matter annihilation into lepton pair. Such models are also severely tested by the precise measurements of magnetic and electric dipole moment of SM leptons. In this talk I will presented the possible signatures from the dark matter annihilation into Standard Model particles at the Galactic Center and constraints imposed on such models using gamma-ray spectrum data released by a various telescopes thus far. [Preview Abstract] |
Friday, October 16, 2015 3:53PM - 4:05PM |
E7.00003: Distinguishing dark matter interactions with direct dark matter detection experiments Jayden Newstead, Lawrence Krauss, Subir Sabharwal, James Dent The nature of the observed dark matter is almost entirely unknown, only indirect observations have been made via its gravitational effects. Working under the assumption that the dark matter is made up of microscopic particles, experiments have been devised to confirm their existence. While there has yet to be any convincing evidence for particle dark matter, it is interesting to ask the question: ``what can we learn about the nature of dark matter particles through experiment?''. In this talk I will present work aimed at answering this question for direct dark matter detection experiments. Our approach maps out a general model space for weakly interacting massive particles (WIMPs) and analyzes the experimental signatures of the various models. Recently we found that direct detection experiments may have a greater discriminating power than previously thought. [Preview Abstract] |
Friday, October 16, 2015 4:05PM - 4:17PM |
E7.00004: Monochromatic Gamma-ray signal from Dark Matter Annihilation Fei Teng Current experimental limits from LHC and Planck have ruled out a large portion of the CMSSM parameter space, while the major tension is between the null result of sub-TeV squark and the low dark matter relic density. However, if we free ourselves from the CMSSM, we still have a large parameter space in which a sub-TeV dark matter may comply to all the current experimental constraints. In this so-called incredible bulk region, sleptons have a nonzero mixing while the dominant dark matter annihilation product is lepton-anti-lepton pair. We have explored this alternative and studied the resultant monochromatic gamma-ray signal produced by the $\gamma\gamma$ and $\gamma Z$ final state. This signal will give some indications to the mixing angle and CP-violation phase of the slepton sector. Future ground-based and satellite-based experiments will reach the sensitivity $10^{-29}\text{cm}^{3}/\text{s}$ for dark matter annihilation cross section and thus are possible to discern this line signal from the continuous background. [Preview Abstract] |
Friday, October 16, 2015 4:17PM - 4:29PM |
E7.00005: Dynamical Dark Matter from Strongly-Coupled Dark Sectors FEI HUANG, Keith Dienes, Shufang Su, Brooks Thomas Dynamical Dark Matter (DDM) is a new frame work for dark-matter physics that relies on a balancing between decay widths and abundances across a vast ensemble of particle species which collectively constitute the dark-matter candidate. Such a balancing can be achieved in broad variety of ways; however, only a small number of these possibilities have thus far been explored in the literature. Indeed, previous studies have focused on a particular class of DDM ensembles--motivated primarily by Kaluza-Klein towers in theories with extra dimensions--for which the density of states behaves roughly as a polynomial of the mass of the state. By contrast, in this paper, we study the properties of a different class of DDM ensembles for which the density of states grows exponentially with the mass of the state. The canonical example of such an ensemble is a collection of ?hadronic? resonances associated with the confining phase of a strongly-coupled dark sector. We demonstrate how an appropriate balancing between decay widths and abundances can naturally arise for such ensembles, despite this exponential rise in the density of states, and investigate how their properties are constrained by observational data. [Preview Abstract] |
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