Guy Raz
Weizmann Institute of Science
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Featured researches published by Guy Raz.
Physical Review Letters | 2006
Yuval Grossman; Yosef Nir; Guy Raz
New physics contributions to Bs-Bs mixing can be parametrized by the size (rs2) and the phase (2thetas) of the total mixing amplitude relative to the standard model amplitude. The phase has so far been unconstrained. We first use the D0 measurement of the semileptonic CP asymmetry ASL to obtain the first constraint on the semileptonic CP asymmetry in Bs decays, ASLs=-0.008+/-0.011. Then we combine recent measurements by the CDF and D0 Collaborations--the mass difference (DeltaMs), the width difference (DeltaGammas), and ASL;s--to constrain 2thetas. The errors on DeltaGammas and ASL;s should still be reduced to have a sensitive probe of the phase, yet the central values are such that the regions around 2thetas approximately 3pi/2 and, in particular, 2thetas approximately pi/2, are disfavored.
Physical Review D | 2002
Yosef Nir; Guy Raz
We re-examine the possibility that the solution to the supersymmetric flavor problem is related to small mixing angles in gaugino couplings induced by approximate horizontal Abelian symmetries. We prove that, for a large class of models, there is a single viable structure for the down quark mass matrix with four holomorphic zeros. Consequently, we are able to obtain both lower and upper bounds on the supersymmetric mixing angles and predict the contributions to various flavor changing neutral current processes. We find that the most likely signals for alignment are
Physical Review Letters | 2006
Yuval Grossman; Yosef Nir; Guy Raz
\Delta m_D
Physical Review D | 2003
Michael Dine; Guy Raz; Yosef Nir; Tomer Volansky
close to the present bound, significant CP violation in
Physical Review D | 2002
Guy Raz
D^0-\bar{D^0}
Physics Letters B | 2006
Michael Gronau; Yuval Grossman; Guy Raz; Jonathan L. Rosner
mixing, and shifts of order a few percent in various CP asymmetries in
Physical Review D | 2002
Guy Raz
B^0
Physical Review D | 2005
Guy Engelhard; Guy Raz
and
Physical Review D | 2005
Guy Engelhard; Guy Raz; Yosef Nir
B_s
Physical Review D | 2005
Guy Engelhard; Yosef Nir; Guy Raz
decays. In contrast, the modifications to radiative B decays, to