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Title: A new probe of relic neutrino clustering using cosmogenic neutrinos

Journal Article · · Physics Letters. B
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Northwestern University, Evanston, IL (United States)
  2. Washington University, St. Louis, MO (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. University of Kentucky, Lexington, KY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)

We propose a new probe of cosmic relic neutrinos (CνB) using their resonant scattering against cosmogenic neutrinos. Depending on the lightest neutrino mass and the energy spectrum of the cosmogenic neutrino flux, a Standard Model vector meson (such as a hadronic ρ) resonance can be produced via $$v\bar{v}$$ annihilation. This leads to a distinct absorption feature in the cosmogenic neutrino flux at an energy solely determined by the meson mass and the neutrino mass, apart from redshift. By numerical coincidence, the position of the ρ-resonance overlaps with the originally predicted peak of the Greisen-Zatsepin-Kuzmin (GZK) neutrino flux, which offers an enhanced effect at higher redshifts. We show that this absorption feature in the GZK neutrino flux may be observable in future radio-based neutrino observatories, such as IceCube-Gen2 radio, provided there exists a large overdensity in the CνB distribution. This therefore provides a new probe of CνB clustering at large redshifts, complementary to the laboratory probes (such as KATRIN) at zero redshift.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359; SC0012704; SC0017987; SC0019095
OSTI ID:
1877627
Report Number(s):
FERMILAB-PUB-22-498-T; NUHEP-TH/22-06; arXiv:2207.02860; oai:inspirehep.net:2107177
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 833; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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