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10 papers
Constraints on from A Three-Flavor Oscillation Analysis of Reactor Antineutrinos at KamLAND
The KamLAND Collaboration
We present new constraints on the neutrino oscillation parameters , , and from a three-flavor analysis of sola…
Breit-Wigner Enhancement of Dark Matter Annihilation
Masahiro Ibe, Hitoshi Murayama, T. T. Yanagida
We point out that annihilation of dark matter in the galactic halo can be enhanced relative to that in the early universe due to a Breit-Wigner tail, if the dark matter annihilates…
Preheating in Supersymmetric Theories
Z. Chacko, H. Murayama, M. Perelstein
We examine the particle production via preheating at the end of inflation in supersymmetric theories. The inflaton and matter scalars are now necessarily complex fields, and their…
First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
KamLAND Collaboration
KamLAND has been used to measure the flux of 's from distant nuclear reactors. In an exposure of 162 tonyr (145.1 days) the ratio of the number of observed inverse…
Leptogenesis from -dominated early universe
K. Hamaguchi, Hitoshi Murayama, T. Yanagida
We investigate in detail the leptogenesis by the decay of coherent right-handed sneutrino having dominated the energy density of the early universe, which was origi…
LSND, SN1987A, and CPT Violation
Hitoshi Murayama, T. Yanagida
We point out that neutrino events observed at Kamiokande and IMB from SN1987A disfavor the neutrino oscillation parameters preferred by the LSND experiment. For (the lig…