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Title: Lepton-number-charged scalars and neutrino beamstrahlung

Experimentally, baryon number minus lepton number, $B-L$, appears to be a good global symmetry of nature. We explore the consequences of the existence of gauge-singlet scalar fields charged under $B-L$ $-$dubbed lepton-number-charged scalars, LeNCS $-$and postulate that these couple to the standard model degrees of freedom in such a way that $B-L$ is conserved even at the non-renormalizable level. In this framework, neutrinos are Dirac fermions. Including only the lowest mass-dimension effective operators, some of the LeNCS couple predominantly to neutrinos and may be produced in terrestrial neutrino experiments. We examine several existing constraints from particle physics, astrophysics, and cosmology to the existence of a LeNCS carrying $B-L$ charge equal to two, and discuss the emission of LeNCS's via "neutrino beamstrahlung," which occurs every once in a while when neutrinos scatter off of ordinary matter. In conclusion, we identify regions of the parameter space where existing and future neutrino experiments, including the Deep Underground Neutrino Experiment, are at the frontier of searches for such new phenomena.
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Center for Neutrino Physics, Dept. of Physics
  2. Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy; Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
Publication Date:
Report Number(s):
NUHEP-TH-18-03; FERMILAB-PUB-18-020-T; arXiv:1802.00009
Journal ID: ISSN 2470-0010; PRVDAQ; 1651767
Grant/Contract Number:
AC02-07CH11359; SC0018327; SC0010143
Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1434229
Alternate Identifier(s):
OSTI ID: 1434941