Portorož 2021: Physics of the Flavourful Universe

Session

Flavor

22 Sept 2021, 11:00

54. Review of flavour physics experimental results

Vladimir Gligorov (Centre National de la Recherche Scientifique (FR))

22/09/2021, 11:00

Flavor

The past two decades have seen a remarkable advance in our understanding in our understanding of quark transitions, and in particular the production and decay of heavy flavour hadrons. In this talk I will review the present status of heavy flavour measurements constraining the CKM matrix which governs quark transitions in the Standard Model, as well as measurements probing rare and forbidden...

28. Anomalies in rare B decays after Moriond 2021

Peter Stangl (University of Bern)

22/09/2021, 11:35

Flavor

Several observables in B-meson decays show discrepancies between
experimental data and Standard Model (SM) predictions. Recently, LHCb
has updated their measurement of the lepton flavor universality (LFU)
observable R_K and, finding a 3.1 σ deviation from the SM, reports
evidence for violation of LFU. This talk will give an overview of the
anomalies in rare B decays and...

64. Semileptonic B(s) decays

Oliver Witzel (Universität Siegen)

22/09/2021, 14:30

Flavor

Form factors describing exclusive semileptonic $B_{(s)}$ decays allow e.g. to extract the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ or obtain predictions for R-ratios testing lepton flavor universality. Using the framework of lattice quantum chromodynamics, we present our results for the semileptonic $B_s \to D_s \ell \nu$, $B_s \to K \ell \nu$, and $B \to \pi \ell \nu$ decays.

First...

3. Exclusive Vub determination from QCD - solution to Vub puzzle?

Blazenka Melic (Rudjer Boskovic Institute)

22/09/2021, 14:55

Flavor

We revisit light-cone sum rule predictions for the full set of local B → π form factors, with focus on the systematic uncertainties that affect this method and carry out a combined fit with the precise lattice QCD results for all form factors simultaneously, in order to provide the most up-to-date exclusive determination of |Vub|. From the world average of the semileptonic B0 → π l ν decay we...

42. The story of Vcb, continued

Kimberley Vos (Universiteit Maastricht (NL))

22/09/2021, 15:20

Flavor

The determination of the CKM element Vcb from inclusive semileptonic
b → c semileptonic decays has reached a high precision thanks to a combination of theoretical and experimental efforts. Moreover, the long standing Vcb puzzle, a discrepancy between inclusive and exclusive determinations seems to be disappearing. In this talk, I will discuss the story of Vcb and how to continue towards even...

61. The Cabibbo angle anomalies: indication of new physics at the TeV scale?

Benedetta Belfatto (Gran Sasso Science Institute & INFN)

22/09/2021, 15:45

Flavor

Recent high precision determinations of $V_{us}$ and $V_{ud}$ indicate towards anomalies in the first row of the CKM matrix. Namely, determination of $V_{ud}$ from beta decays and of $V_{us}$ from kaon decays imply a violation of first row unitarity at about $3\sigma$ level. Moreover, there is tension between determinations of $V_{us}$ obtained from leptonic $K\mu2$ and semileptonic $K\ell3$...

1. (g-2)𝜇, B anomalies and DM: a loop model tale

Marco Fedele (KIT)

23/09/2021, 16:30

Flavor

In this talk I will review how the anomalous magnetic moment of the muon and the B anomalies can be addressed by a combined explaination, by means of loop models characterized by minimal field content. Moreover, I will show how some of these model can also provide a viable DM candidate, accounting for the measured relic density while evading direct and indirect DM constraints.

29. Flavorful leptoquarks at the LHC and beyond: Spin 1

Ivan Nišandžić (Ruđer Bošković Institute)

23/09/2021, 16:55

Flavor

Evidence for electron-muon universality violation that has been revealed in b→sℓℓ transitions in the observables $R_{K,K^\ast}$ by the LHCb Collaboration can be explained with spin-1 leptoquarks in $SU(2)_L$ singlet $V_1$ or triplet $V_3$ representations in the $\mathcal{O}(1−10)$ TeV range. We explore the sensitivity of the high luminosity LHC (HL-LHC) and future proton-proton colliders to...

33. $K \to \pi \nu \bar{\nu}$ and $\epsilon_K$ in the Standard Model and beyond

Martin Gorbahn (Liverpool University)

23/09/2021, 17:20

Flavor

In this talk I will present the updated Standard Model prediction of
the golden rare Kaon decay modes and the CP violating parameter
epsilon_K. I will focus on the recent theoretical improvements which
result in an increased sensitivity to physics beyond the Standard
Model. I will also present a computer program that provides the
results of the relevant perturbative calculations in a wide...

25. From B anomalies to Kaon physics with scalar leptoquarks

David Marzocca (INFN Trieste)

23/09/2021, 17:45

Flavor

After reviewing combined solutions of flavor anomalies with the singlet and triplet scalar leptoquarks $S_1$ and $S_3$, I will present possible connections to Kaon physics observables. By assuming a flavor structure for the leptoquark couplings dictated by a minimally broken $U(2)^5$, we find that bound on $Br(K^+ \to \pi^+ \nu\nu)$ from NA62 puts already some tension in the model, while the...

51. Lepton Flavor Violation and Dilepton Tails at the LHC

Dr Olcyr Sumensari (University of Zurich)

24/09/2021, 11:00

Flavor

Charged Lepton Flavor Violation (LFV) is a very clean probe of New Physics since it is forbidden in the Standard Model (SM). The observation of neutrino oscillation implies nonzero LFV rates, which however are highly suppressed by the smallness of neutrino masses. This makes LFV an appealing target of experimental searches, as its observation would unambiguously point to New Physics.

In...

65. Leptoquarks and LFUV in B-decays

Damir Becirevic (CNRS et Universite Paris Sud)

24/09/2021, 11:25

BSM

We discuss the single LQ solutions to the problem of accommodating the observed hints of LFUV in B-decays. We then focus on the combination of two scalar leptoquarks R2 and S3 and formulate the model which can describe all of the anomalies. We update the previous results with a particular emphasis on the bounds arising from the high-pT tail of pp --> tau nu. We then consider several new...

17. Muonic force behind flavor anomalies

Admir Greljo (Universitaet Bern (CH))

24/09/2021, 11:50

Flavor

I will review our recent work on lepton flavor non-universal and anomaly-free U(1) gauge extensions of the SM. The phenomenological discussion will be centered around flavor anomalies in rare B-meson decays and muon g-2. This talk is based on 2103.13991 (AG, Stangl, and Thomsen) and 2107.07518 (AG, Soreq, Stangl, Thomsen, and Zupan).

56. Hadronic light-by-light contribution to the muon magnetic moment

Dr Gerardin Antoine (CPT)

Flavor

After the publication of the new measurement of the muon $g-2$ by the Fermilab experiment, a tension of about 4 sigma is observed with the Standard Model estimate published by the Muon g-2 theory initiative.
The theory error is completely dominated by hadronic uncertainties, namely the hadronic vacuum polarization (HVP) and the hadronic light-by-light (HLbL) contributions and the published...