3 research outputs found
Minimal Flavour Violation and Beyond
Starting from the effective-theory framework for Minimal Flavour Violation,
we give a systematic definition of next-to-minimal (quark) flavour violation in
terms of a set of spurion fields exhibiting a particular hierarchy with respect
to a small (Wolfenstein-like) parameter. A few illustrative examples and their
consequences for charged and neutral decays with different quark chiralities
are worked out in some detail. Our framework can be used as a model-independent
classification scheme for the parameterization of flavour structure from
physics beyond the Standard Model.Comment: 17 pages, no figures, phenomenological discussion extended,
references adde
Subleading Jet Functions in Inclusive B Decays
The contribution of subleading jet functions to inclusive decay distributions
of mesons are derived from a systematic two-step matching of QCD current
correlators onto soft collinear and heavy quark effective theory. Focusing on
the tree level matching of QCD onto soft collinear effective theory, the
subleading jet functions are defined to all orders in (with
) and are calculated explicitly at first
order in . We present explicit expressions for the decay rates
of and the contribution to , where the subleading jet functions are multiplied by a tree level
hard function and appear in a convolution with the leading order shape
function. Together with the recent two loop calculation of the leading order
hard function for , this paper will allow for a more
precise description of inclusive B decays in the end point region.Comment: Minor changes: reference added, typos corrected, journal versio
Effect of FCNC mediated Z boson on lepton flavor violating decays
We study the three body lepton flavor violating (LFV) decays , and the semileptonic decay in the flavor changing neutral current (FCNC) mediated boson
model. We also calculate the branching ratios for LFV leptonic B decays,
, , and the
conversion of muon to electron in Ti nucleus. The new physics parameter space
is constrained by using the experimental limits on and
. We find that the branching ratios for and processes could be as large as and . For other LFV B decays the branching ratios are found to be too
small to be observed in the near future.Comment: 15 pages, 8 figures, typos corrected, one more section added, version
to appear in EPJ