Status of New Physics searches with b→sℓ+ℓ−b \to s \ell^{+}\ell^{-} transitions @ LHCb

Rare decays of heavy-flavoured particles provide an ideal laboratory to look for deviations from the Standard Model, and explore energy regimes beyond the LHC reach. Decays proceeding via electroweak penguin diagrams are excellent probes to search for New Physics, and $b \to s \ell^{+}\ell^{-}$ processes are particularly interesting since they give access to many observables such as branching fractions, asymmetries and angular observables. Recent results from the LHCb experiment are reviewed.Comment: Proceedings for the Fifty-Second Rencontres de Moriond on Electroweak Interactions and Unified Theorie

Electroweak physics at LHCb

Measurements of electroweak boson production provide an important test of the Standard Model at the LHC energies and allow the partonic content of the proton to be constrained. $W$ and $Z$ bosons are reconstructed in several leptonic final states using data samples corresponding to an integrated luminosity of up to about 1 $fb^{-1}$. Inclusive and associated production cross-sections are reported.Comment: Proceedings for the Second Annual Conference on Large Hadron Collider Physics (LHCP

Measurement of prompt D+ and D+s production in pPb collisions at √sNN= 5.02 TeV

The production of prompt D+ and D+s mesons is studied in proton-lead collisions at a centre-of-mass energy of √sNN = 5.02 TeV. The data sample corresponding to an integrated luminosity of (1.58 ± 0.02)nb−1 is collected by the LHCb experiment at the LHC. The differential production cross-sections are measured using D+ and D+s candidates with transverse momentum in the range of 0 < pT < 14 GeV/c and rapidities in the ranges of 1.5 < y∗ < 4.0 and –5.0 < y∗ < –2.5 in the nucleon-nucleon centre-of-mass system. For both particles, the nuclear modification factor and the forward-backward production ratio are determined. These results are compared with theoretical models that include initial-state nuclear effects. In addition, measurements of the cross-section ratios between D+, D+s and D0 mesons are presented, providing a baseline for studying the charm hadronization in lead-lead collisions at LHC energies

Measurement of the CKM angle γ using the B^± → D*h^± channels

A measurement of the CP-violating observables from B±→D∗K± and B±→D∗π± decays is presented, where D∗(D) is an admixture of D∗0 and D¯∗0 (D0 and D¯0) states and is reconstructed through the decay chains D∗→Dπ0/γ and D→K0Sπ+π−/K0SK+K−. The measurement is performed by analysing the signal yield variation across the D decay phase space and is independent of any amplitude model. The data sample used was collected by the LHCb experiment in proton-proton collisions and corresponds to a total integrated luminosity of 9 fb−1 at centre-of-mass energies of 7, 8 and 13 TeV. The CKM angle γ is determined to be (69+13−14)∘ using the measured CP-violating observables. The hadronic parameters rD∗K±B,rD∗π±B,δD∗K±B,δD∗π±B, which are the ratios and strong phase differences between favoured and suppressed B± decays, are also reported