Cosmological constraints on the gravitino LSP scenario with a sneutrino NLSP

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.025011· OSTI ID:21010924

Kanzaki, Toru; Kawasaki, Masahiro ^[1]; Kohri, Kazunori ^[2]; Moroi, Takeo ^[3]

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1. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)
3. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

We study the scenario where a sneutrino is the next to lightest supersymmetric particle (NLSP) which decays into a gravitino and standard model particles. The daughter particles such as neutrinos and quarks cause electromagnetic and hadronic showers and affect big-bang nucleosynthesis. It is found that, despite a small branching ratio, four-body processes including quarks in the final state give the most stringent constraint on the sneutrino abundance for gravitino mass of 1-100 GeV. Pion production by high-energy neutrinos is important when the sneutrinos decay at {approx}1 sec. We also discuss the thermal leptogenesis in the sneutrino NLSP scenario.

• OSTI ID: 21010924
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
COSMOLOGY
FOUR-BODY PROBLEM
GEV RANGE
NEUTRINOS
NUCLEOSYNTHESIS
PARTICLE DECAY
PARTICLE PRODUCTION
QUARKS
REST MASS
SPARTICLES
STANDARD MODEL