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Title: Structure of virtual photon polarization in ultrarelativistic heavy-ion collisions

Abstract

Anisotropy in heavy-ion collisions leads to polarization of both direct and virtual photons, the latter detected via internal conversion to dileptons pairs. Thus measurement of photon polarization probes the anisotropy at all stages of collisions. In order to characterize the polarization of virtual photons, we derive here the general structure of the photon polarization operator, ρ μ ν , in an anisotropic medium, in terms of the four spectral functions, two transverse and one longitudinal, as usual, plus a new spectral function that reflects anisotropy in asymmetric collisions; and derive the local production rate of dilepton pairs in terms of these four functions.

Authors:
 [1];  [2];  [3]
  1. Univ. of Illinois, Urbana, IL (United States). Dept. of Physics; RIKEN, Wako (Japan). iTHES Research Group. iTHEMS Program
  2. RIKEN, Wako (Japan). iTHES Research Group. iTHEMS Program. Nishina Center
  3. Kent State Univ., Kent, OH (United States). Dept. of Physics
Publication Date:
Research Org.:
Kent State Univ., Kent, OH (United States); RIKEN, Wako (Japan)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1502352
Grant/Contract Number:  
[SC0013470; PHY1305891; PHY1066292; 25287066]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
[ Journal Volume: 967]; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ultrarelativistic heavy-ion collisions; anisotropy; photon polarization; dilepton pairs

Citation Formats

Baym, Gordon, Hatsuda, Tetsuo, and Strickland, Michael. Structure of virtual photon polarization in ultrarelativistic heavy-ion collisions. United States: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.05.068.
Baym, Gordon, Hatsuda, Tetsuo, & Strickland, Michael. Structure of virtual photon polarization in ultrarelativistic heavy-ion collisions. United States. doi:10.1016/j.nuclphysa.2017.05.068.
Baym, Gordon, Hatsuda, Tetsuo, and Strickland, Michael. Mon . "Structure of virtual photon polarization in ultrarelativistic heavy-ion collisions". United States. doi:10.1016/j.nuclphysa.2017.05.068. https://www.osti.gov/servlets/purl/1502352.
@article{osti_1502352,
title = {Structure of virtual photon polarization in ultrarelativistic heavy-ion collisions},
author = {Baym, Gordon and Hatsuda, Tetsuo and Strickland, Michael},
abstractNote = {Anisotropy in heavy-ion collisions leads to polarization of both direct and virtual photons, the latter detected via internal conversion to dileptons pairs. Thus measurement of photon polarization probes the anisotropy at all stages of collisions. In order to characterize the polarization of virtual photons, we derive here the general structure of the photon polarization operator, ρμν, in an anisotropic medium, in terms of the four spectral functions, two transverse and one longitudinal, as usual, plus a new spectral function that reflects anisotropy in asymmetric collisions; and derive the local production rate of dilepton pairs in terms of these four functions.},
doi = {10.1016/j.nuclphysa.2017.05.068},
journal = {Nuclear Physics. A},
number = ,
volume = [967],
place = {United States},
year = {2017},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 1 work
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Figures / Tables:

Fig. 1 Fig. 1: (a) Compton scattering of a gluon against a quark or anti-quark producing a photon; (b) production of a photon and gluon by quark-antiquark annihilation.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.