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 X16: Particle Theory 
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Sponsoring Units: DPF Chair: Carleton De Tar, University of Utah Room: 251D 
Tuesday, April 19, 2016 10:45AM  10:57AM 
X16.00001: Fermion Propagators Interpolating between the Instant and Front Forms of Relativistic Dynamics Bailing Ma, ChuengRyong Ji The instant form and the front form of dynamics originally proposed by Dirac in 1949 can be linked by introducing an interpolating angle. In the present work, we discuss the fermion propagator interpolating between the Instant Form Dynamics (IFD) and the Light Front Dynamics (LFD). Using a simple example, which is the scattering of a scalar particle with a fermion, we trace the fates of the timeordered fermion propagators as the form of the dynamics goes from the IFD to the LFD. With our interpolation method, we show that the two timeordered propagators corresponding to the positive and negative energy contributions in IFD change to the onshell and instantaneous contributions in LFD, respectively. We also present the interpolating helicity amplitudes for the scattering of photon and fermion, i.e. the Compton Scattering, as well as for the twophoton production process in the pair annihilation of fermion and antifermion. We discuss the whole landscape of each of these amplitudes and amplitude squares that show the frame dependence as well as the interpolating angle dependence. [Preview Abstract] 
Tuesday, April 19, 2016 10:57AM  11:09AM 
X16.00002: Semiclassical Electrodynamics John Lestone Quantum electrodynamics is complex and its associated mathematics can appear overwhelming for those not trained in this field. We describe semiclassical approaches that can be used to obtain a more intuitive physical feel for several QED processes including electrostatics, Compton scattering, pair annihilation, the anomalous magnetic moment, and the Lamb shift, that could be taught easily to undergraduate students. Any physicist who brings their laptop to the talk will be able to build spread sheets in less than 10 minutes to calculate g/2$=$1.001160 and a Lamb shift of 1057 MHz. [Preview Abstract] 
Tuesday, April 19, 2016 11:09AM  11:21AM 
X16.00003: Lattice Study of Magnetic Catalysis in Graphene Effective Field Theory Christopher Winterowd, Carleton DeTar, Savvas Zafeiropoulos The discovery of graphene ranks as one of the most important developments in condensed matter physics in recent years. As a strongly interacting system whose lowenergy excitations are described by the Dirac equation, graphene has many similarities with other strongly interacting field theories, particularly quantum chromodynamics (QCD). Graphene, along with other relativistic field theories, have been predicted to exhibit spontaneous symmetry breaking (SSB) when an external magnetic field is present. Using nonperturbative methods developed to study QCD, we study the lowenergy effective field theory (EFT) of graphene subject to an external magnetic field. We find strong evidence supporting the existence of SSB at zerotemperature and characterize the dependence of the chiral condensate on the external magnetic field. We also present results for the mass of the NambuGoldstone boson and the dynamically generated quasiparticle mass that result from the SSB. [Preview Abstract] 
Tuesday, April 19, 2016 11:21AM  11:33AM 
X16.00004: Little Conformal Symmetry Rachel Houtz, Kit Colwell, John Terning We explore a new class of natural models which ensure the oneloop divergences in the Higgs mass are cancelled. The toppartners that cancel the top loop are new gauge bosons, and the symmetry relation that ensures the cancellation arises at an infrared fixed point. Such a cancellation mechanism can, a la Little Higgs models, push the scale of the new physics that completely solves the hierarchy problem up to 510 TeV. When embedded in a supersymmetric model, the stop and gravitino masses provide the cutoffs for the loops, and the mechanism ensures a cancellation between the stop and gaugino mass dependence of the Higgs mass parameter. [Preview Abstract] 
Tuesday, April 19, 2016 11:33AM  11:45AM 
X16.00005: Compactification on phase space Benjamin Lovelady, James Wheeler A major challenge for string theory is to understand the dimensional reduction required for comparison with the standard model. We propose reducing the dimension of the compactification by interpreting some of the extra dimensions as the energymomentum portion of a phasespace. Such models naturally arise as generalized quotients of the conformal group called biconformal spaces. By combining the standard KaluzaKlein approach with such a conformal gauge theory, we may start from the conformal group of an ndimensional Euclidean space to form a 2ndimensional quotient manifold with symplectic structure. A pair of involutions leads naturally to two ndimensional Lorentzian manifolds. For n = 5, this leaves only two extra dimensions, with a countable family of possible compactifications and an SO(5) YangMills field on the fibers. Starting with n=6 leads to 4dimensional compactification of the phase space. In the latter case, if the two dimensions each from spacetime and momentum space are compactified onto spheres, then there is an SU(2)xSU(2) (leftright symmetric electroweak) field between phase and configuration space and an SO(6) field on the fibers. Such a theory, with minor additional symmetry breaking, could contain all parts of the standard model. [Preview Abstract] 
Tuesday, April 19, 2016 11:45AM  11:57AM 
X16.00006: Reproducing sterile neutrinos and the behavior of flavor oscillations with superconductingmagnetic proximity effects Thomas E. Baker The physics of a superconductor subjected to a magnetic field is known to be equivalent to neutrino oscillations [1]. Examining the properties of singlettriplet oscillations in the magnetic field, a sterile neutrino is suggested to be represented by singlet Cooper pairs and moderates flavor oscillations between three flavor neutrinos (triplet Cooper pairs) [2]. A superconductorexchange spring [3] system's rotating magnetization profile is used to simulate the massflavor oscillations in the neutrino case and the physics of neutrino oscillations are discussed. Connecting the condensed matter system and the particle physics system with this analogy may allow for the properties of the condensed matter system to inform neutrino experiments. [1] Y. Pehlivan, A.B. Balantekin, T. Kajino, and T. Yoshida, {\it Invariants of collective neutrino oscillations}, Physical Review D {\bf 84}, 065008 (2011) [2] T.E. Baker, {\it Reproducing sterile neutrinos and the behavior of flavor oscillations with superconductingmagnetic proximity effects}, (arxiv:1601.00913) [3] T.E. Baker, A. RichieHalford, and A. Bill, {\it Long range triplet Josephson current and 0$\pi$ transitions in tunable domain walls}, New Journal of Physics {\bf 16}, 093048 (2014) [Preview Abstract] 

X16.00007: ABSTRACT WITHDRAWN 
Tuesday, April 19, 2016 12:09PM  12:21PM 
X16.00008: TypeIII seesaw fermionic triplets at high energy $e^{+}e^{}$ collider Deepanjali Goswami, Poulose Poulose We investigate the signature of heavy fermionic triplets belonging to TypeIII seesaw model through their direct production at the high energy $e^{+}e^{}$ collider. Single and pair production of the charged ($\Sigma^{\pm}$) and neutral ($\Sigma^{0}$) triplets through the processes, $e^{+} e^{} \rightarrow \Sigma^{+}\Sigma^{}, \Sigma^{0} \Sigma^{0}, \Sigma^{0}\nu, \Sigma^{\pm}\ell$ are considered for the study. The subsequent decay of the triplets to the detector level final states are studied with the corresponding Standard Model (SM) background processes. The decay distributions are considered in details to identify the significant channels, after devising and employing suitable methods to reduce backgrounds and enhance the signal significance. Advantage of single triplet production in association with the charged SM leptons to investigate the mixing of the triplet with the SM leptons is exploited. Preliminary results show the presence of charged fermionic triplets up to a mass of $\sim$ 950 GeV could be established through the single production at 1 TeV ILC, assuming a fermionic triplet electron mixing of 0.05 and a moderate integrated luminosity of 300 $fb^{1}$. Further, constraints in the massmixing are obtained for different CM energies assuming different luminosities. [Preview Abstract] 
Tuesday, April 19, 2016 12:21PM  12:57PM 
X16.00009: Is a Generalized NJL Model the Effective action of Massless QCD? Invited Speaker: Alejandro Cabo Montes de Oca 
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