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Title: Pion production via proton synchrotron radiation in strong magnetic fields in relativistic field theory: Scaling relations and angular distributions

We study pion production by proton synchrotron radiation in the presence of a strong magnetic field when the Landau numbers of the initial and final protons are n(i, f) similar to 10(4)-10(5). We find in our relativistic field theory calculations that the pion decay width depends only on the field strength parameter which previously was only conjectured based upon semi-classical arguments. Moreover, we also find new results that the decay width satisfies a robust scaling relation, and that the polar angular distribution of emitted pion momenta is very narrow and can be easily obtained. This scaling implies that one can infer the decay width in more realistic magnetic fields of 10(15) G, where n(i, f) similar to 10(12)-10(13), from the results for n(i, f) similar to 10(4)-10(5). The resultant pion intensity and angular distributions for realistic magnetic field strengths are presented and their physical implications discussed. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP(3).
ORCiD logo [1] ;  [2] ;  [3] ;  [4]
  1. Nihon Univ., Fujisawa (Japan). College of Bioresource Sciences; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai (Japan); National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo (Japan)
  2. Soongsil Univ., Seoul (Korea Republic of ) Dept. of Physics; Univ. of Tokyo, Tokyo (Japan). Dept. of Astronomy, Graduate School of Science
  3. National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo (Japan); Univ. of Tokyo, Tokyo (Japan). Dept. of Astronomy, Graduate School of Science
  4. Univ. of Notre Dame, Notre Dame, IN (United States). Dept. of Physics, Center of Astrophysics
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 757; Journal Issue: C; Journal ID: ISSN 0370-2693
Research Org:
Univ. of Notre Dame, IN (United States)
Sponsoring Org:
USDOE; National Research Foundation of Korea (NRF); JSPS of the Ministry of Education, Culture, Sports, Science and Technology of Japan
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; gamma-ray bursts; tev emission; energy; constraints; collapsars; galaxy