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Nucleon decay into a dark sector.

Hooman Davoudiasl1

  • 1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.

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|February 21, 2015
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Summary
This summary is machine-generated.

New nucleon decay searches can detect sub-GeV dark sector fermions (X). These particles, interacting via baryon-number violation or a dark force mediator (Z(d)), may have evaded previous neutrino-based searches.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • Sub-GeV dark sector fermions (X) can interact via baryon-number-violating (BNV) processes.
  • These BNV interactions can lead to nucleon decay signatures, mimicking standard neutrino channels but with distinct kinematics.
  • A light vector mediator, the dark force Z(d), can mediate additional interactions for dark sector fermions.

Purpose of the Study:

  • To explore novel nucleon decay channels involving dark sector fermions.
  • To investigate the potential for nucleon decay searches to uncover new dark states.
  • To analyze the detectability of dark sector fermions through their decay products.

Main Methods:

  • Studying baryon-number-violating interactions of sub-GeV dark sector fermions.
  • Analyzing nucleon decay modes such as nucleon -> X + meson and neutron -> X + photon.
  • Considering the impact of a light dark force mediator (Z(d)) on neutron decay (neutron -> X + Z(d)).
  • Examining the decay of Z(d) into lepton pairs (e+e- or mu+mu-).

Main Results:

  • Nucleon decay searches can reveal sub-GeV dark sector fermions (X).
  • BNV interactions and dark force mediation (Z(d)) provide potential detection channels.
  • These channels may have escaped detection in standard neutrino-based searches due to kinematic differences.
  • Z(d) mediators typically decay into electron or muon pairs with high branching fractions.

Conclusions:

  • Nucleon decay experiments offer a unique window into the dark sector.
  • These searches can uncover dark states with negligible couplings to ordinary matter.
  • The study highlights the potential for discovering new particles and forces beyond the Standard Model.