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 U13: Elementary Particles |
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Sponsoring Units: DAP Chair: Brian Rauch, Washington University, St. Louis Room: 250F |
Monday, April 18, 2016 3:30PM - 3:42PM |
U13.00001: Dense Axion Stars Abhishek Mohapatra, Eric Braaten, Hong Zhang If the dark matter consists of axions, gravity can cause them to coalesce into axion stars, which are stable gravitationally bound Bose-Einstein condensates of axions. In the previously known axion stars, gravity and the attractive force between pairs of axions are balanced by the kinetic pressure. If the axion mass energy is $mc^2=10^{-4}$ eV, these dilute axion stars have a maximum mass of about $10^{-14} M_\odot$. We point out that there are also dense axion stars in which gravity is balanced by the mean-field pressure of the axion condensate. We study axion stars using the leading term in a systematically improvable approximation to the effective potential of the nonrelativistic effective field theory for axions. Using the Thomas-Fermi approximation in which the kinetic pressure is neglected, we find a sequence of new branches of axion stars in which gravity is balanced by the mean-field interaction energy of the axion condensate. If $mc^2=10^{-4}$4 eV, the first branch of these dense axion stars has mass ranging from about $10^{-11} M_\odot$ toabout $M_\odot$. [Preview Abstract] |
Monday, April 18, 2016 3:42PM - 3:54PM |
U13.00002: Multi-Dimensional Effective Field Theory Analysis for Direct Detection of Dark Matter Hannah Rogers Experiments like the Cryogenic Dark Matter Search (CDMS) attempt to find dark matter (non-luminous matter that makes up approximately 80\% of the matter in the universe) through direct detection of interactions between dark matter and a target material. The Effective Field Theory (EFT) approach increases the number of considered interactions between dark matter and the normal, target matter from two (spin independent and spin dependent interactions) to eleven operators with four possible interference terms. These additional operators allow for a more complete analysis of complimentary direct dark matter searches; however, the higher dimensional likelihoods necessary to span an increase in operators requires a clever computational tool such as MultiNest. I present here analyses of published and projected data from CDMS (Si and Ge targets) and LUX (liquid Xe target) assuming operator parameter spaces ranging from 3 - 5 dimensions and folding in information on energy-dependent backgrounds when possible. [Preview Abstract] |
Monday, April 18, 2016 3:54PM - 4:06PM |
U13.00003: Superfluid vortices in dense quark matter S Kumar Mallavarapu, Mark Alford, Andreas Windisch, Tanmay Vachaspati Superfluid vortices in the color-flavor-locked (CFL) phase of dense quark matter are known to be energetically disfavored as compared to well-separated triplets of “semi-superfluid” color flux tubes. In this talk we will provide results which will identify regions in parameter space where the superfluid vortex spontaneously decays. We will also discuss the nature of the mode that is responsible for the decay of a superfluid vortex in dense quark matter. We will conclude by mentioning the implications of our results to neutron stars. [Preview Abstract] |
Monday, April 18, 2016 4:06PM - 4:18PM |
U13.00004: Study of J/psi Pair Production Grant Riley We study the J/psi pair final state produced in proton-proton collisions at the LHC at 7 and 8 TeV center-of-mass energies with the CMS detector. The J/psi are reconstructed from their decay into muon pairs where the CMS detector provides excellent identification for muons with momenta as low as 2 GeV. In this final state, eventual resonances are predicted such as $\eta_b$, heavy quark tetra-quarks governed by strong interaction or a low-mass Higgs bosons in minimal SUSY extensions of the standard model. An important step in isolating signals is the understanding of the non-resonant J/psi pair production. Only recently based on the coss section measurements in LHCb and complementary measurements in CMS have production models been provided that not only include single-parton scattering but double-parton scattering and consider color singlet and color octet intermediate J/psi states. This measurement and the search for di-quarkonia resonances is presented here. [Preview Abstract] |
Monday, April 18, 2016 4:18PM - 4:30PM |
U13.00005: Using the IRC Model to Calculate the Energy of the Flavorless Scalar Mesons Aran Stubbs The IRC model has multiple layers of structure. In it, the Scalar Mesons have a proto-quark and an anti-proto-quark orbiting above a pair of gravitons in s orbits, along with some proto-photons. Flavorless mesons have a proto-quark and an anti-proto-quark of corresponding flavors. The neutral pion has 2 configurations: a proto-up and a anti-proto-up along with 4 proto-photons; or a proto-down and a anti-proto-down along with 2 proto-photons. The total kinetic energy is P* times the 1s energy, where P* is the piece equivalent energy count. The Up form has P*$=$20 with 4 filled s sub-shells, the down form has P*$=$12 with 3 filled s sub-shells. The charged pion has a P* of 18, with the proto-up in 2s and the proto-down in 3s orbits, along with 3 proto-photons. This allows a calculation of the rest energy of the proto-up, proto-down, and neutral pion from the charged pion of 17.95820(4), 37.77024(9), and 134.97659(34) MeV respectively. From the other flavorless scalar mesons, the rest energy of the proto-strange is 268.833(16) MeV and the proto-charm is 540.60(9) MeV. These correspond reasonably well to the bottom up calculation from the constituents of the proto-quarks. [Preview Abstract] |
Monday, April 18, 2016 4:30PM - 4:42PM |
U13.00006: Heavy quarks within electroweak multiplet Jaime Besprosvany, Ricardo Romero Standard-model fields and associated electroweak Lagrangian components are equivalently expressed within a shared basis that maintains the particles' representations. The derived single mass-generating Higgs-field operator, delineated by the vacuum expectation value, simultaneously constrains the vector-scalar couplings, and the parity-conserving fermion Hamiltonian, and thus, the heavy-quark masses, beside the vectors': it fixes the top-quark mass, for maximal hierarchy, or given the bottom-quark mass. An interpretation follows that electroweak bosons and heavy quarks belong in a multiplet. [Preview Abstract] |
Monday, April 18, 2016 4:42PM - 4:54PM |
U13.00007: Direct proof of the Ward-like identities in split field theory Abdulmajeed Abdurrahman, Ibrahim Abdurrahman, Mahmoud Gassem The bosonic representation of the split field theory of the open bosonic string ghost, in the full string basis, is examined. The proof that the split field theory 3- vertex (matter and ghost) in the bosonic representation satisfy the Ward like identities is established thus completing the proof of the Bose Fermi equivalence in the split field theory formalism of the open bosonic string. [Preview Abstract] |
Monday, April 18, 2016 4:54PM - 5:06PM |
U13.00008: On the Matter-Antimatter Asymmetry and Dark Matter Walton Perkins According to the composite photon theory, there is a complete disconnect between matter and antimatter galaxies. Antimatter is transparent to photons and matter is transparent to antiphotons that are identified as ``dark photons.'' Thus, antimatter galaxies would appear to us as dark matter, and our Milky Way would appear as dark matter to a creature in an antimatter galaxy. The evidence against the existence of antimatter galaxies is re-examined in light of this new theory [1]. [1] W. A. Perkins, Modern Physics Letters A, Vol. 30, 1550157 (2015). [Preview Abstract] |
Monday, April 18, 2016 5:06PM - 5:18PM |
U13.00009: A Simple Mathematical Model for Standard Model of Elementary Particles and Extension Thereof. ASHOK SINHA An algebraically (and geometrically) simple model representing the masses of the elementary particles in terms of the interaction (strong, weak, electromagnetic) constants is developed, including the Higgs bosons. The predicted Higgs boson mass is identical to that discovered by LHC experimental programs; while possibility of additional Higgs bosons (and their masses) is indicated. The model can be analyzed to explain and resolve many puzzles of particle physics and cosmology including the neutrino masses and mixing; origin of the proton mass and the mass-difference between the proton and the neutron; the big bang and cosmological Inflation; the Hubble expansion; etc. A novel interpretation of the model in terms of quaternion and rotation in the six-dimensional space of the elementary particle interaction-space -- or, equivalently, in six-dimensional spacetime -- is presented. Interrelations among particle masses are derived theoretically. A new approach for defining the interaction parameters leading to an elegant and symmetrical diagram is delineated. Generalization of the model to include supersymmetry is illustrated without recourse to complex mathematical formulation and free from any ambiguity. [Preview Abstract] |
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