1,767 research outputs found
The Daya Bay Reactor Neutrino Experiment
The Daya Bay reactor neutrino experiment is designed to study the disappearance of antineutrinos from the Daya Bay nuclear power plant in China. The goal of this experiment is to measure the remaining unknown neutrino mixing parameter theta13 with high precision: sin^2(2Θ_(13))<0.01. The experiment is presently under construction and it is anticipated that data acquisition will begin in 2011
Aspects of SU(3) baryon extrapolation
We report on a recent chiral extrapolation, based on an SU(3) framework, of
octet baryon masses calculated in 2+1-flavour lattice QCD. Here we further
clarify the form of the extrapolation, the estimation of the infinite-volume
limit, the extracted low-energy constants and the corrections in the
strange-quark mass.Comment: 4 pages, 3 figures, pdftex, prepared for the proceedings of CIPANP
09, San Diego, USA, March 26-31, 200
Dark Matter in B-L Extended MSSM Models
We analyze the dark matter problem in the context of supersymmetric
U(1)_{B-L} model. In this model, the lightest neutalino can be the B-L gaugino
widetilde {Z}_{B-L} or the extra Higgsinos widetilde{chi}_{1,2} dominated. We
compute the thermal relic abundance of these particles and show that, unlike
the LSP in MSSM, they can account for the observed relic abundance with no
conflict with other phenomenological constraints. The prospects for their
direct detection, if they are part of our galactic halo, are also discussed.Comment: 11 pages, 9 figures. Published versio
QCD Effects in Cosmology
The cosmological evolution in the radiation dominated regimen is usually
computed by assuming an ideal relativistic thermal bath. In this note, we
discuss the deviation from the non-interaction assumption. In either the
standard model (SM) and the minimal supersymmetric standard model (MSSM), the
main contribution comes from the strong interaction. An understanding of these
effects are important for precision measurements and for the evolution of
scalar modes, where the commented corrections constitute the main source of the
dynamics.Comment: 4 pages, 2 figures. Contributed to CIPANP 2009: Tenth Conference on
the Intersections of Particle and Nuclear Physics, May 26-31, 2009, San
Diego, Californi
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