Bulletin of the American Physical Society
2013 Fall Meeting of the APS Division of Nuclear Physics
Volume 58, Number 13
Wednesday–Saturday, October 23–26, 2013; Newport News, Virginia
Session DF: qgp/ Scattering/ Lattice/ Monopole |
Hide Abstracts |
Chair: James Vary, Iowa State University Room: Blue Point II |
Thursday, October 24, 2013 10:30AM - 10:42AM |
DF.00001: QCD Factorization and large pT J/psi production Hong Zhang, Yan-Qing Ma, Jianwei Qiu Suppression of $J/\psi$ production in quark gluon plasma (QGP) formed in Au-Au collisions at RHIC has been considered potentially as a good probe of QGP. At the LHC, with larger center-of-mass energy, CMS collaboration has already observed $J/\psi$ with transverse momentum ($p_T$) as large as 30 GeV in Pb-Pb collisions, which is expected to be a good probe of QGP properties complimentary to $J/\psi$ total cross section. Unlike the total cross section, at large $p_T$, the scales for the production of the heavy quark pair and the pair's subsequent interaction with the medium are clearly separated and could provide more and cleaner information on QGP or in general the medium created during the collisions. All previous models for heavy quarkonium production at large $p_T$ in p-p collisions are, one way or another, unfortunately, proven to be inconsistent with experimental data. A new QCD factorization approach for evaluating heavy quarkonia production was proposed recently and proved perturbatively valid to both leading and next-to-leading power in $1/p^2$ expansion and all orders in powers of $\alpha_s$. In this talk, I will introduce this new QCD factorization formula and discuss its application to $J/\psi$ production in p-p and A-A collisions. [Preview Abstract] |
Thursday, October 24, 2013 10:42AM - 10:54AM |
DF.00002: Anomalous soft photon production from the induced currents in Dirac sea Frasher Loshaj, Dmitri Kharzeev The propagation of a high energy quark distrurbs the confining vacuum inducing the currents in Dirac sea. Since quarks possess electric charge, these induced vacuum currents act as a source of soft photon radiation. This can lead to the enhancement of the soft photon production above the expectations based on the charged hadron yields and the Low theorem. We illustrate the phenomenon by using the exactly soluble $1+1$ dimensional massless Abelian gauge model that shares with QCD all of the ingredients involved in this mechanism: confinement, chiral symmetry breaking, axial anomaly, and the periodic $\theta$-vacuum. We show that the propagating quark throughout the process of hadronization induces in the vacuum charged transition currents that lead to a strong resonant enhancement of the soft photon yield; the Low theorem however remains accurate in the limit of very soft momenta. We then construct on the basis of our result a simple phenomenological model and apply it to the soft photon production in the fragmentation of jets produced in $Z^0$ decays. We find a qualitative agreement with the recent result from the DELPHI Collaboration. [Preview Abstract] |
Thursday, October 24, 2013 10:54AM - 11:06AM |
DF.00003: The Vacuum in Light Front Quantum Field Theories Marc Herrmann, Wayne Polyzou We study the light-front vacuum by comparing free fields with different masses. It is well known that the physical and Fock vacuum differ in the canonical filed theories; however, for field theories quantized on a light-front the physical and Fock vacuum are identified. We use solvable free field theories to investigate the relation between the vacua and different representations of the free field theories in these different cases. [Preview Abstract] |
Thursday, October 24, 2013 11:06AM - 11:18AM |
DF.00004: Scattering in the Euclidean formulation of relativistic quantum mechanics Wayne Polyzou Euclidean relativistic quantum mechanics is a formulation of relativistic quantum mechanics based on the Osterwalder-Schrader reconstruction theorem that exploits the logical independence of locality from the rest of the axioms of Euclidean field theory. I discuss the properties of Euclidean Green functions necessary for the existence of M{\o}ller wave operators and the construction of these wave operators in this formalism. [Preview Abstract] |
Thursday, October 24, 2013 11:18AM - 11:30AM |
DF.00005: Interpolating Spinors and Scattering Amplitudes between Instant and Front Forms of Relativistic Dynamics Ziyue Li, Murat An, Chueng-Ryong Ji Among the three forms of relativistic Hamiltonian dynamics proposed by Dirac in 1949, the instant form and the front form can be interpolated by introducing an interpolation angle between the ordinary time t and the light-front time $(t+z/c)/\sqrt{2}$. In this presentation, a general helicity spinor that interpolates between the instant form and the front form is derived from the general poincare algebra developed for any interpolation angle. Using the general helicity spinors for any interpolation angle, we calculated the $e^{+}e^{-}\rightarrow\mu^{+}\mu^{-}$ scattering amplitude and analyzed both the frame dependence and the interpolation angle dependence of each helicity amplitude. We also showed that the disappearance of the connected contributions to the current from the vacuum in the light-front dynamics is independent of the reference frame and should be distinguished from the usual result in the infinite momentum frame. [Preview Abstract] |
Thursday, October 24, 2013 11:30AM - 11:42AM |
DF.00006: Electron GPDs from Basis Light Front Quantization Approach Xingbo Zhao, Dipankar Chakrabarti, Heli Honkanen, Ravi Manohar, Pieter Maris, James Vary The Basis Light Front Quantization (BLFQ) approach is a first-principles nonperturbative numerical framework for solving quantum field theory. Based on the light front Hamiltonian formalism, it yields the lightfront wavefunctions for mass eigenstates of the chosen system. Therefore, it provides an ideal framework for evaluating observables defined on the lightcone, such as the generalized parton distributions (GPDs). Being experimentally accessible through exclusive processes like deeply virtual Compton scattering or deeply virtual vector meson production, the GPDs encode nonperturbative information about the spatial, as well as the spin and angular momentum structure of the system. In this work, we apply this method to Quantum Electrodynamics (QED) and specifically study a physical electron dressed by the virtual photon cloud. Based on the resulting lightfront wavefunction, we compute the electron GPDs and make comparison with results from perturbation theory. [Preview Abstract] |
Thursday, October 24, 2013 11:42AM - 11:54AM |
DF.00007: Two-Nucleon Systems in a Finite Volume Raul Briceno, Zohreh Davoudi, Thomas Luu, Martin Savage With Lattice QCD calculations in mind, I will motivate the study of two-nucleon systems in a finite volume and review issues regarding partial wave mixing. I will outline the derivation of the the quantization condition for two nucleons in a finite volume with periodic boundary conditions. The result holds for arbitrary isospin, parity, and momenta below inelastic thresholds. I will pay close attention to the positive parity sector and consider the implication of the quantization condition for the two-nucleon spectrum at the physical point. [Preview Abstract] |
Thursday, October 24, 2013 11:54AM - 12:06PM |
DF.00008: On the extraction of tensor force from lattice QCD Zohreh Davoudi, Raul Briceno, Thomas Luu, Martin Savage The finite volume spectrum of the two-nucleon system in 3S1-3D1 channel not only gives access to the nucleon-nucleon scattering phase shifts but also to the S-D mixing parameter of this channel. By studying the finite volume energy quantization condition of the two-nucleon system with non-zero center of mass momenta, I will introduce a spectral quantity that is sensitive to the S-D mixing in the deuteron channel. I will discuss the implication of the results presented for the extraction of the tensor force in future lattice QCD calculations. [Preview Abstract] |
Thursday, October 24, 2013 12:06PM - 12:18PM |
DF.00009: Chiral Magnetic Wave Ho-Ung Yee Chiral Magnetic Wave is a new gapless collective transport of chiral charges in the presence of magnetic field, which originates from the triangle anomaly of the underlying chiral symmetry. We discuss several theoretical and phenomenological aspects of Chiral Magnetic Wave, both at weak coupling using kinetic theory and at strong coupling in the framework of AdS/CFT correspondence. We also discuss possible study of Chiral Magnetic Wave in out-of-equilibrium conditions. [Preview Abstract] |
Thursday, October 24, 2013 12:18PM - 12:30PM |
DF.00010: Why baryons are Yang-Mills magnetic monopoles, validated by nuclear binding energies and proton and neutron masses Jay R. Yablon Evidence is summarized from four recent papers that baryons including protons and neutrons are magnetic monopoles of non-commuting Yang-Mills gauge theories: 1) Protons and neutrons are ``resonant cavities'' with binding energies determined strictly by the masses of the quarks they contain. This is proven true at parts-per million accuracy for each of the $^{2}$H, $^{3}$H,$^{3}$He, $^{4}$He binding energies and the neutron minus proton mass difference. 2) Respectively, each free proton and neutron contains 7.64 MeV and 9.81 MeV of mass/energy used to confine its quarks. When these nucleons bind, some, never all, of this energy is released and the mass deficit goes into binding. The balance continues to confine quarks. $^{56}$Fe releases 99.8429{\%} of this energy for binding, more than any other nuclide. 3) Once we consider the Fermi vev one also finds an entirely theoretical explanation of proton and neutron masses, which also connects within experimental errors to the CKM quark mixing angles. 4) A related GUT explains fermion generation replication based on generator loss during symmetry breaking, and answers Rabi's question ``who ordered this?'' 5) Nuclear physics is governed by combining Maxwell's two classical equations into \textit{one} equation using non-commuting gauge fields in view of Dirac theory and Fermi-Dirac-Pauli Exclusion. 6) Atoms themselves are core \textit{magnetic} charges (nucleons) paired with orbital \textit{electric} charges (electrons and elusive neutrinos), with the periodic table itself revealing an electric/magnetic symmetry of Maxwell's equations often pondered but heretofore unrecognized for a century and a half. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2021 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
1 Research Road, Ridge, NY 11961-2701
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700