Portoroz 2015: Particle Phenomenology From the Early Universe to High Energy Colliders

Session

Flavour

7 Apr 2015, 11:05

James Cook (Portoroz, Slovenia)

12. Recent news in heavy flavor semileptonic decays

Thomas Mannel (Siegen University)

07/04/2015, 11:05

Planary Talk

I will review a few recent result in the field of semileptonic decays of bottom and charm hadrons, including both exclusive as well as inclusive decays.

15. A Precision Determination of the CKM Element Vcb

Dr Kristopher Healey (Università di Torino)

07/04/2015, 11:28

Planary Talk

Including the recently computed O(α ΛQCD^2}/mb^2) corrections, we perform an extraction of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb and the most relevant parameters of the heavy quark expansion from the data of inclusive semileptonic B decays. Using a recent determination of the charm quark mass, we obtain |Vcb|=(42.21±0.78)×10^{-3} and the bottom quark mass in the...

0. Factorization properties of three-body non-leptonic B decays

Javier Virto (Universitat Siegen)

07/04/2015, 11:51

Planary Talk

Three body non-leptonic decays of B mesons have been studied at B factories and at the LHC, and will become a benchmark for flavor and CP studies at Belle II. I will discuss the QCD properties of three body hadronic B decays in the different regions of phase space and their interconnection, matching the different factorization descriptions in each regime, in an attempt to reconstrunct the...

27. News on Penguin Effects in CP Violation Benchmark Decays

Robert Fleischer (CERN)

07/04/2015, 12:14

Planary Talk

Measurements of CP violation in $B^0_d\to J/\psi K_{\rm S}^0$ and $B^0_s\to J/\psi \phi$ decays play key roles in testing the quark-flavour sector of the Standard Model. The theoretical interpretation of the corresponding observables is limited by uncertainties from doubly Cabibbo-suppressed penguin topologies. With continuously increasing experimental precision, it is mandatory to get a...

46. Searching for New Physics in Heavy Flavor Decays: Recent Results from the B Factories and LHCb, and Future Prospects

Alan Schwartz (University of Cincinnati)

08/04/2015, 16:30

Planary Talk

We review recent results in heavy flavor decays from the Belle , BaBar, and LHCb experiments. These measurements range from mixing parameters to CKM phases to various observables in electroweak penguin decays. The results are sensitive to new physics and thus constrain exte nsions to the Stan- dard Model. Several inconsistencies between measured valu es and Standard Model...

24. "Hadronic Effects and Observables in $B\to \pi\ell^+\ell^- $ decay"

Alexander Khodjamirian (University of Siegen)

08/04/2015, 16:58

Planary Talk

I will present new results on the theory of the rare flavour-changing neutral-current decay $B\to \pi\ell^+\ell^-$ in the region of large recoil of the pion. Nonlocal hadronic effects in this decay are treated in a systematic way, combining QCD calculation with hadronic dispersion relation including the vector meson contributions. The effective addition to the Wilson coefficient $C_9$...

65. Some hadronic contributions to B-Vll

Roman Zwicky (edinburgh university)

08/04/2015, 17:21

Planary Talk

I will discuss recent progress on B->V form factors. This will for instance include the use of the equation of motion in reducing the uncertainty of tensor-to-vector form factors. The latter is of primary importance for the zero crossing of helicity amplitudes which has major impacts on angular observables. I will discuss the impact of cc-resonances on determination of angular observables.

54. SM challenges and BSM opportunities in rare B decays in the light of recent data.

Sebastian Jaeger (University of Sussex (GB))

08/04/2015, 17:44

Planary Talk

I will discuss the problems and opportunities in disentangling SM and BSM effects in rare semileptonic and radiative decays, including electronic final states and lepton universality-violating observables. I will contrast SM and BSM effects in the context of (i) the LHCb anomaly, (ii) the search for right-handed currents, and (iii) lepton-universality violation.

39. The State of New Physics in Rare B Decays

Wolfgang Altmannshofer (Perimeter Institute)

09/04/2015, 14:30

Planary Talk

I will present results of global fits of all relevant experimental data on rare b-->s decays. Significant tensions between the Standard Model predictions and the data are observed that could be explained by unexpectedly large hadronic effects or by new physics. Assuming hadronic uncertainties are estimated in a sufficiently conservative way, I will discuss the implications of the experimental...

4. Lepton-nonuniversality and flavor in rare decays

Gudrun Hiller (Technische Universitaet Dortmund (DE))

09/04/2015, 14:53

Planary Talk

Lepton-nonuniversality in rare b decays provides opportunities to diagnose BSM physics at the weak scale. We discuss correlations and give directions for flavor patterns in model-specific realizations with leptoquarks.

29. Composite leptoquarks and anomalies in B-meson decays

Marco Nardecchia

09/04/2015, 15:16

Planary Talk

I will discuss the possibility to explain recent anomalies in semileptonic B decays at LHCb via a composite Higgs model, in which both the Higgs and a triplet leptoquark arise as pseudo-Goldstone bosons of the strong dynamics. Fermion masses are assumed to be generated via the mechanism of partial compositeness, which largely determines the leptoquark couplings and implies non-universal lepton...

41. Explaining the $b \to s$ anomalies with a dark sector

Avelino Vicente (Université de Liège)

09/04/2015, 15:39

Planary Talk

The LHCb collaboration has recently reported on some anomalies in $b \to s$ transitions. In addition to discrepancies with the Standard Model (SM) predictions in some angular observables and branching ratios, an intriguing hint for lepton universality violation was found. Here we propose a simple model that extends the SM with a dark sector charged under an additional $U(1)$ gauge...

18. Tree-level constraints on 2HDMs

Martin Jung (TU Dortmund)

10/04/2015, 09:00

Planary Talk

We investigate the constraints on Two-Higgs-Doublet Models stemming from precision measurements of tree-level decays. We focus on leptonic and semileptonic meson decays, but also consider bounds from recent searches at ATLAS and CMS.

36. Discerning new physics in charm meson leptonic and semileptonic decays

Ivan Nisandzic (TU Dortumd)

10/04/2015, 09:23

Planary Talk

Current experimental information on the charm meson decay observables in which the $c\to s\ell\nu_\ell$ transitions occur is well compatible with the Standard Model (SM) predictions. Recent precise lattice calculations of the $D_s$ meson decay constant and form factors in $D \to K \ell\nu$ decays offer a possibility to search for the small deviations from the SM predictions in the next...

48. Flavor violation in tau decays

Alexey Petrov (Wayne State University)

10/04/2015, 09:46

Planary Talk

Lepton flavor-violating processes offer interesting possibilities to probe new physics at multi-TeV scale. We discuss those in the framework of effective field theory, emphasizing the role of gluonic operators. Those operators are obtained by integrating out heavy quarks that are kinematically inaccessible at the scale where low-energy experiments take place and make those experiments...

53. CP asymmetries in bottom and charm decays

Ulrich Nierste (Karlsruhe Institute of Technology (KIT))

10/04/2015, 10:09

Planary Talk

The standard way to measure the CP phases $2\beta$ and $2\beta_s$ uses $B_{d,s}$ decays into charmonium. The theoretical precision is limited by the unknown penguin contribution to the decay amplitude. I show that this contribution can be expressed in terms of the same matrix elements which constitute to the dominant tree amplitude. The second part of my talk addresses a global analysis of D...