4 research outputs found
Triple-Product Correlations in B -> V1 V2$ Decays and New Physics
In this paper we examine T-violating triple-product correlations (TP's) in B
-> V1 V2 decays. TP's are excellent probes of physics beyond the standard model
(SM) for two reasons: (i) within the SM, most TP's are expected to be tiny, and
(ii) unlike direct CP asymmetries, TP's are not suppressed by the small strong
phases which are expected in B decays. TP's are obtained via the angular
analysis of B -> V1 V2. In a general analysis based on factorization, we
demonstrate that the most promising decays for measuring TP's in the SM involve
excited final-state vector mesons, and we provide estimates of such TP's. We
find that there are only a handful of decays in which large TP's are possible,
and the size of these TP's depends strongly on the size of nonfactorizable
effects. We show that TP's which vanish in the SM can be very large in models
with new physics. The measurement of a nonzero TP asymmetry in a decay where
none is expected would specifically point to new physics involving large
couplings to the right-handed b-quark.Comment: 42 pages, LaTeX, no figures. Title changed, several explanatory
paragraphs added, references added, analysis and conclusions unchange
Heavy Flavour Physics at HERA - a Survey
At the HERA collider at DESY, high energy electron and positron beams
interact with proton beams. A review is presented of the variety of ways in
which these collisions produce final states containing charm and beauty quarks.Comment: 45 pages including 30 figures. Submitted to International Journal of
Modern Physics
Chiral 2pi exchange at order four and peripheral NN scattering
We calculate the impact of the complete set of two-pion exchange
contributions at chiral order four (also known as
next-to-next-to-next-to-leading order, N3LO) on peripheral partial waves of
nucleon-nucleon scattering. Our calculations are based upon the analytical
studies by Kaiser. It turns out that the contribution of order four is
substantially smaller than the one of order three, indicating convergence of
the chiral expansion. We compare the prediction from chiral pion-exchange with
the corresponding one from conventional meson-theory as represented by the Bonn
Full Model and find, in general, good agreement. Our calculations provide a
sound basis for investigating the issue whether the low-energy constants
determined from pi-N lead to reasonable predictions for NN.Comment: 22 pages RevTex including 11 figure