Conveners
Day 2: Morning 1
- Thomas Mannel (TP1)
Day 2: Morning 2
- Ulrich Nierste (KIT)
Day 2: Afternoon 1
- Ilija Milutin (University of Siegen)
Day 2: Afternoon 2
- Martin Novoa-Brunet (IFIC, U. Valencia, CSIC)
Exclusive $B$-decays provide valuable insights into physics beyond the Standard Model and measurements of Standard Model parameters. At large hadronic recoil Soft-Collinear Effective Theory is the appropriate theory to describe the QCD dynamics of heavy-to-light transitions and to resum logarithmic corrections to all orders in perturbation theory. However, since the relevant hadronic matrix...
Semileptonic $B_{(s)}$ decays are of great phenomenological interest and allow to extract the CKM matrix elements or test lepton flavor universality.
We explore $B_{(s)}$ decays with vector final states by studying $B_s\to D_s^*$ using the narrow width approximation. Taking advantage of existing data we present first results for the form factors using our setup based on RBC-UKQCD's 2+1 flavor...
We consider the combined measurements of CP-averaged decay rates and direct CP asymmetries of B±→K±ℓ+ℓ− and B±→π±ℓ+ℓ− to probe (non-local) four-quark operator matrix element contributions to rare semileptonic B meson decays. We also explore how their effects could be in principle disentangled from possible local new physics effects. We construct a ratio of CP-odd decay rate differences which...
We reinvestigate contributions of scalar leptoquarks in
anomalies and in
decays. Then, we update the constraints on parameter space and find which scalar leptoquarks remain viable and consistent with low-energy and high-energy flavour physics constraints. We comment on the implications of such selection.
Our ability to trace new physics in the $c\to u\ell^+\ell^-$ transitions
by measuring the $D\to\pi\ell^+\ell^-$ decay width
critically depends on the accurate knowledge of this decay amplitude,
dominated by an overlap of a singly Cabibbo suppressed weak decay and
electromagnetic lepton pair emission.
We calculate this amplitude, combining LCSRs with
hadronic dispersion relation, and...
Neutral charm meson mixing has first been observed in 2007 by Belle and Babar and soon after confirmed by LHCb and CDF. A longstanding discrepancy, of multiple orders of magnitude, is present between the leading order theoretical calculation of the so-called box diagram and the world average experimental value. The leading order theoretical value is extremely small due to the GIM mechanism...
The available data on exclusive $c\to s \ell \nu$ decays is analysed for three main purposes. First, a study of the relevant hadronic matrix elements is performed using dispersive bounds, resulting in theoretical predictions of observables which can be confronted with experimental results. Then, a combined Bayesian analysis of the experimental data is done for the extraction of the CKM element...
The study of charm-quark-related phenomena is a cornerstone of the flavour physics programme, as it offers unique opportunities to test the Standard Model and to explore different new physics scenarios. The observation of the CP asymmetries in the decays of neutral charm mesons to two light pseudoscalars by LHCb imposes up to date a question without a definite answer. In previous work we...
The calculation of local form factors involved in the SM predictions of semileptonic $B$-meson decays at low-$q^2$ is a crucial ingredient in the assessment of the $B$-anomalies.
We revisit their calculation in QCD Light-Cone Sum Rule with $B$-meson Light-Cone Distribution Amplitudes. In our strategy, we bypass the quark-hadron duality (QHD) approximation which usually contributes an unknown...
