On new physics in non-leptonic tree level b-quark decays and hadron-quark duality violations.
We review the validity of the assumption of having no new physics in tree level b quark transitions and
(
). In particular we test for possible deviations on the Wilson coefficients of the corresponding effective current-current operators with respect to their Standard Model values. The allowed new physics regions are determined using a global fit. We take into account constraints from different flavour observables calculated from the hadronic decays
,
,
,
and
. We also include observables from neutral B meson mixing such as
and the semileptonic asymmetries
. We show that deviations in the tree level Wilson coefficients of the order
are consistent with state of the art experimental measurements. We study the implications of these deviations over the decay width
of
meson mixing, not measured yet by experiments, and over the precision of the CKM phase
. Our results show that enhancements on
by up to a factor of 3.6 with respect to the Standard Model value are allowed by data. Moreover the effects on
can compete with the corresponding experimental precision
. Finally we explore for possible hadron-quark duality violations in the neutral
and
meson sectors. This analysis includes constraints from mixing observables and from the lifetimes of
and
mesons. We find that duality violations of
can provide an explanation to the tension of several orders of magnitude between the Heavy Quark Expansion and experimental data in the observable
of neutral
meson mixing.
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picture_as_pdf - Tetlalmatzi-Xolocotzi-thesis.pdf