Conveners
Quark Flavour
- Chair: Ulrich Nierste (Institut fuer Theoretische Teilchenphysik, KIT CS)
Quark Flavour
- Chair: Syuhei Iguro (KIT)
Quark Flavour
- Session Chair: Marco Fedele (KIT, TTP)
The first results from the Belle II collaboration related to the determination of CP violation in $B$ decays presented. Both time-dependent and direct CP violation measurements are possible at this next generation $e^+e^-$ $B$ factory. The first determinations of and constraints on all three CKM unitarity triangle angles are presented. Results using data sets equivalent to an integrated...
The study of lepton flavor universality violation (LFUV) plays an important role in search for new physics beyond standard model and has recently provided some anomalous results. Benefiting from the large datasets available at LHCb, many such measurements have been performed. Some of these measurements have very good precision and play a leading role in their respective world average values....
The vector leptoquark $U_{1}(3,1,2/3)$ is the only single mediator which can simultaneously address the anomalies in $B$-physics. Remarkably, such explanation of the $B$-anomalies requires a hierarchy in the $U_{1}$ couplings which may be connected with the well-known hierarchies in the masses of the SM fermions. In this direction, a twin Pati-Salam model was recently proposed, in which the...
This talk presents recent Belle II results on lepton flavor universality and flavour violation tests using B meson and tau decay.
The low-background collision environment along with the possibility of partially or fully reconstructing one of the two B mesons in the event offer high precision measurements of B decays or rare decays with missing energy. Results from semileptonic and electroweak...
In the context of a class of two Higgs doublet models where CP violation only arises spontaneously, a possible connection between CP violations in the quark and lepton sectors (described by the CKM and PMNS matrices) is analysed. The important role of scalar flavour changing couplings (SFCNC) in this type of scenario is also discussed in detail.
B0– ̄B0 entanglement offers a conceptual alternative to the single charged B-decay asymmetry for the measurement of the direct CP-violating γ=φ3 phase. With f=J/ΨK_L ; J/ΨK_S and g=(ππ)0; (ρ_Lρ_L)0, the 16 time-ordered double-decay rate intensities to (f,g) depend on the relative phase between the f- and g-decay amplitudes given by γ at tree level. Several constraining consistencies appear....
A well known technique to determine the decay amplitudes
of non-leptonic B meson processes is QCD factorization. One of the main issues
faced by this procedure is the analytical determination of power suppressed terms,
for instance of annihilation topologies. In this talk we describe the extraction of the
annihilation contributions from data. Our method is based on establishing a set of
rules...
The parameter ᵱᵃ is an important measure of the
imbalance between matter and antimatter in the neutral kaon (ᵃ0 and ᵃ¯0)
system. In particular, ᵱᵃ provides a highly sensitive probe of new physics and
plays a critical role in the global fit of the Cabibbo-Kobayashi-Maskawa matrix. As
one of the first discovered sources of ᵃᵄ violation, it has been extensively
measured in experiment to per-mil...
Scalar leptoquarks are popular mediators in new physics explanations of the experimental anomalies in $ b \to s \mu^+ \mu^-$ decays and the muon $g-2$; however, the non-observation of charged lepton flavor violation and proton decay impose severe constraints on their interactions. We present a novel protection mechanism in the form of a gauged, lepton-flavored U(1) symmetry, which is broken by...
We discuss anomalies associated with outer automorphisms in gauge theories based on classical groups, namely charge conjugations for SU(N) and parities for SO(2r). We emphasize the inequivalence between two versions of charge conjugation for SU(N) symmetries, and also two versions of parity for SO(2r) symmetries. The subgroups that commute with the outer automorphisms are identified. Some...
The lepton sector of the Standard Model is at present haunted by several intriguing anomalies, including an emerging pattern of deviations in $b \to s \ell \ell$ processes, with hints of lepton flavor universality violation, and a discrepancy in the muon anomalous magnetic moment. More importantly, it cannot explain neutrino oscillation data, which necessarily imply the existence of non-zero...
The phenomenon of $B^0_q-\bar{B}^0_q$ mixing $(q=d,s)$ provides a sensitive probe for physics beyond the Standard Model. We have a careful look at the analyses of the determination of the Unitarity Triangle apex, which is needed for the Standard Model predictions of the $B_q$ mixing parameters, and we explore how much space for New Physics is left through the current data. We study the impact...
The heavy quark expansion (HQE) provides a well established framework to compute inclusive decay widths of heavy hadrons in terms of a systematic expansion in inverse powers of the constituent heavy quark mass. By including for the first time the contribution of the Darwin operator, SU(3)$_F$ breaking corrections to the matrix element of dimension-six four-quark operators and the so-called...
