Centre de Physique Théorique


Vendredi 3 novembre 2017

Collisionless Boltzmann (Vlasov) Equation and Modeling of Self-Gravitating Systems and Plasmas

Conférence internationale co-organisée par R. Triay (CPT)

The modelling of the matter interactions at long range is a fertile problem for Mathematics, a major issue in Physics and a challenge for Analysis and Numerical Simulations. The aim of this meeting is to conjugate all these aspects, with a special attention to the simulations, and try to infuse a stimulating working atmosphere, such as in a workshop, with few key lectures (part of these will be chosen when finalizing the program).

14h00 – 15h00, Amphi 5 du CPT

Patterns of New Physics in b→sℓ+ℓ− transitions in the light of recent data

Bernat Capdevilla (IFES, Barcellona)

In the Standard Model (SM), the rare transitions where a bottom quark decays into a strange quark and a pair of light leptons exhibit a potential sensitivity to physics beyond the SM. In addition, the SM embeds Lepton Flavour Universality (LFU), leading to almost identical probabilities for muon and electron modes. The LHCb collaboration discovered a set of deviations from the SM expectations in decays to muons and also in ratios assessing LFU. Other experiments (Belle, ATLAS, CMS) found consistent measurements, albeit with large error bars. To assess the extend of potential New Physics effects, we perform a global fit to all available b→sℓ+ℓ− data (l = e,μ) in a model-independent way. In this seminar, I will introduce to you the techniques used for the computation of the relevant observables in b→sℓ+ℓ− transitions, paying special attention to the treatment of hadronic uncertainties, present the latest results of our global analysis and discuss the opportunities that new observables testing LFU violation can provide.