0000000000680301
AUTHOR
Gabriela Alejandra Barenboim Szuchman
Inflation might be caused by the right: Handed neutrino
We show that the scalar field that drives inflation can have a dynamical origin, being a strongly coupled right handed neutrino condensate. The resulting model is phenomenologically tightly constrained, and can be experimentally (dis)probed in the near future. The mass of the right handed neutrino obtained this way (a crucial ingredient to obtain the right light neutrino spectrum within the see-saw mechanism in a complete three generation framework) is related to that of the inflaton and both completely determine the inflation features that can be tested by current and planned experiments.
Constraints on the W-R mass and CP violation in left-right models
We update the constraints on the right-handed WR gauge boson mass, mixing angle ζ with the left-handed WL gauge boson, and other parameters in general left-right symmetric models with different mechanisms of CP violation. Constraints mostly independent of any assumption on the quark sector are obtained from a re-analysis of muon decay data. Estimates of the left-right hadronic matrix elements in the neutral kaon system and their uncertainties are revised using large Nc and Chiral Perturbation Theory arguments. With explicitly given assumptions on the long-distance (ΔS=1)2 contributions to the KL−KS mass difference, lower bounds on MWR are obtained. With the same assumptions, one also gets s…
Constraining new physics with the Fermilab measurement of CP violation in B ->psi K-s
Recently, the CDF Collaboration has reported a measurement of the CP asymmetry in the B --> psi K-s decay: a(psi K), = 0.74(-0.44)(+0.44). We analyze the constraints that follow from this measurement on the size and the phase of contributions from new physics to B-B mixing. Defining the relative phase between the full Mt:! amplitude and the standard model contribution to be 2 theta(d), we find a new bound: sin2 theta(d) greater than or similar to -0.6 (-0.87) at 1 sigma (95% C.L.). Further implications for the CP asymmetry in semileptonic B decays are discussed.