Many of the models seeking to explain the flavor anomalies seen by LHCb predict new particles that couple preferentially to tau's and b-quarks. Agreement with the SM is less than perfect. LHCb flavour anomalies continue to intrigue Two papers published today in Nature review recent flavour measurements from the LHCb experiment that are at odds with theoretical predictions 7 June, 2017 | By Matthew Chalmers Measurements of R (D*) from LHCb (green region), BaBar and Belle compared to the Standard Model prediction (red). LHCb will continue to improve the precision on its anomalous flavour measurements, whilst also investigating related observables that could provide complementary information. CNP 9 can't have q2 dependence. New results on avor anomalies at LHCb Paula Alvarez Cartelle on behalf of the LHCb collaboration Dark Matter @ LHC Heidelberg, April 2018 The indirect approach Study processes that are suppressed or even forbidden in the SM - possible NP e ects relatively large Precision measurement of observables that are very well predicted in the SM Verification from other experiments, such as Belle II, is expected in the near future, so exciting times lay ahead of the particle physics community! RK = BR(B+→K+μμ) [1,6] BR(B+→K+ee) [1,6] = 0.745⋅(1±13%) muons are among the most reliable objects within LHCb the electron channel would be an obvious culprit (brems + low stats). Deviations The decay of a B 0 meson into a K *0 and an e + e - pair, used to test lepton universality in the Standard Model, recorded by LHCb. The LHCb Run 1 results (red), those from the additional 2016 dataset only (blue), and those from both datasets (black) are shown along with the SM predictions (orange). 1) [1709.03921] Assume h h (q2) same for e= cases. The observation of flavour anomalies in b hadron decays repre-sents an important part of the program of indirect detection of BSM physics. The observation of flavour anomalies in hadron decays represents an important part of the program of indirect detection of BSM physics. Federal University of Rio de Janeiro. Credit: LHCb Further Reading Recently several studies of b→sll (l=e, μ, or τ leptons) rare decays exhibit tensions between experimentalresults and the Standard Model predictions of branching fractions, angulardistributions and lepton universality. The latest results from LHCb on the flavour anomalies will be presented and their interpretation will be discussed. The presence - or not - of flavour anomalies is part of the general flavour problem of the standard model of particle physics. Introduction: EFT for avor physics h (q2): data-driven approaches at LHCb - I Unbinned ML ts to data w/ external inputs as Gaussian constraints. A possible violation of lepton flavour universality (LFUV) is also called a flavour anomaly, which, if confirmed, would be a sign of "New Physics" (NP) beyond the standard model. This had led some to speculate that both effects could be caused by a single new particle. Abstract: The LHCb experiment is devoted to searches for new types ofinteractions in loop decays of heavy quarks. Credit: OPEN-PHO-EXP-2018-004-1. The U(1) ′ charges are assigned to quarks and leptons in a flavor-dependent manner, and flavored Higgs doublets are also introduced in order to detail the Yukawa couplings at the . The LHCb collaboration has released a much anticipated update on its measurement of R K - a ratio that describes how often a B + meson decays to a charged kaon and either a μ + μ - or an e + e - pair, and . The LHCb experiment is ideally suited for the study of the these flavour anomalies, due to its large acceptance, precise vertexing and powerful particle iden-tification capabilities. We study an extended Standard Model with a gauged U(1) ′ flavor symmetry, motivated not only by the fermion mass hierarchy but also by the excesses in B→ K (∗) ll reported by the LHCb collaborations. Recap of flavor anomalies: b → s LHCb and B factories measured several key b → s and b → c modes. Several benchmarkanalyses involving leptonic or semileptonic decays are presented, with an emphasis on intriguingpatterns which are systematic in their trend, though not individually significant yet. This latest result is even more interesting given that LHCb has seen an anomaly in another measurement (the R_k anomaly) involving the same b → s transition. Biplab Dey Flavor anomalies at LHCb May 14th, 2018 8 / 23. These two separate CMS analyses look for particles that decay specifically to tau leptons. Flavour anomalies in B decays at LHCb. Several benchmark analyses involving leptonic or semileptonic decays are presented, with an emphasis on intriguing patterns which are systematic in their trend, though not individually significant yet. E-mail: On behalf of the LHCb collaboration - also at U.Constantine. The most popular idea is a so-called 'leptoquark' that only interacts with some of the flavors. tensions with the SM predictions. LHCb anomalies from a natural perspective Isabel García García Journal of High Energy Physics 2017, Article number: 40 ( 2017 ) Cite this article 227 Accesses 47 Citations Metrics A preprint version of the article is available at arXiv. Anomalies persist in flavour-changing B decays 11 March 2020 The distribution of the angular variable P5' as a function of the mass squared of the muon pair, q2. A bstract Tension between the Standard Model (SM) and data concerning b → s processes has become apparent.