The vector leptoquark representation, Uμ ¼ ð3; 1; 2=3Þ, was recently identified as an exceptional single mediator model to address experimental hints on lepton flavor universality violation in semileptonic B-meson decays, both in neutral (b → sμμ) and charged (b → cτν) current processes. Nonetheless, it is well known that massive vectors crave an ultraviolet (UV) completion. We present the first full-fledged UV complete and calculable gauge model which incorporates this scenario while remaining in agreement with all other indirect flavor and electroweak precision measurements, as well as, direct searches at high-pT . The model is based on a new non-Abelian gauge group spontaneously broken at the TeV scale, and a specific flavor structure suppressing flavour violation in ΔF ¼ 2 processes while inducing sizeable semileptonic transitions

Given many possible forms that physics Beyond the Standard Model (BSM) could take, it is important to pursue a bottom-up approach in which as few assumptions as possible about the BSM sector are made. In this talk, we present a combined analysis of LHC Run-1 Higgs data (signal strengths) together with LEP-2 WW production measurements, in the framework of an Effective Field Theory (EFT) where the SM is extended by higher-dimensional operators suppressed by the mass scale of new physics Λ. Working under this hypothesis, important relations among Higgs and electroweak precision observables occur. We perform the first consistent analysis at the order Λ−2 in the EFT expansion keeping all the relevant operators. While the two data sets suffer from flat directions, together they impose stringent model-independent constraints on the anomalous couplings, thus showing the importance of a global analysis in the EFT framework. We also discuss challenges faced when interpreting diboson production at the LHC in the EFT context.

— I discuss the implications of the long-standing anomaly in semitauonic B meson decays for new physics (NP) searches at high-pT with ATLAS and CMS detectors. Effective field theory is used to identify potential signatures at high energies correlated with the anomaly. Several representative models put forward to explain the anomaly are examined in details: color-neutral vector triplet, 2HDM, scalar and vector leptoquark model. We find that in general τ+τ− searches impose serious challenge to NP explanations of the anomaly. After recasting present 8 and 13 TeV analyses stringent limits are set on all the models.

We investigate the impact of flavor-conserving, non-universal quark-lepton contact interactions on the dilepton invariant mass distribution in p p → (cid:2) + (cid:2) − processes at the LHC. After recasting the recent ATLAS search performed at13TeVwith36 . 1fb − 1 ofdata,wederivethebestup-to-date limits on the full set of 36 chirality-conserving four-fermion operators contributing to the processes and estimate the sensitivity achievable at the HL-LHC. We discuss how these high- p T measurements can provide complementary infor-mation to the low- p T rare meson decays. In particular, we find that the recent hints on lepton-flavor universality violation in b → s μ + μ − transitions are already in mild tension with the dimuon spectrum at high- p T if the flavor structure follows minimal flavor violation. Even if the mass scale of new physics is well beyond the kinematical reach for on-shell production, the signal in the high- p T dilepton tail might still be observed, a fact that has been often overlooked in the present literature. In scenarios where new physics couples predominantly to third generation quarks, instead, the HL-LHC phase is necessary in order to provide valuable infor-mation.

I revisit a set of pseudo-observables (PO) in Higgs decays that parameterise, in great generality, possible beyond the Standard Model effects. PO are defined from the decomposition of onshell decay amplitudes around the physical poles. On the one hand, PO can be determined from experimental data, providing a systematic generalisation of the ”κ-framework” so far adopted by the LHC experiments. On the other hand, PO can be computed in large set of new physics (NP) models and, in particular, in any Effective Field Theory (EFT) approach to Higgs physics. The PO framework allows for a systematic inclusion of higher-order QED/QCD corrections. These features single out PO as a correct formalism for general interpretation of the upcoming precision measurements in Higgs physics.

This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. The second part discusses the recent progress in Higgs effective field theory predictions, followed by the third part on pseudo-observables, simplified template cross section and fiducial cross section measurements, which give the baseline framework for Higgs boson property measurements. The fourth part deals with the beyond the Standard Model predictions of various benchmark scenarios of Minimal Supersymmetric Standard Model, extended scalar sector, Next-to-Minimal Supersymmetric Standard Model and exotic Higgs boson decays. This report follows three previous working-group reports: Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002), Handbook of LHC Higgs Cross Sections: 2. Differential Distributions (CERN-2012-002), and Handbook of LHC Higgs Cross Sections: 3. Higgs properties (CERN-2013-004). The current report serves as the baseline reference for Higgs physics in LHC Run 2 and beyond.

This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. The second part discusses the recent progress in Higgs effective field theory predictions, followed by the third part on pseudo-observables, simplified template cross section and fiducial cross section measurements, which give the baseline framework for Higgs boson property measurements. The fourth part deals with the beyond the Standard Model predictions of various benchmark scenarios of Minimal Supersymmetric Standard Model, extended scalar sector, Next-to-Minimal Supersymmetric Standard Model and exotic Higgs boson decays. This report follows three previous working-group reports: Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002), Handbook of LHC Higgs Cross Sections: 2. Differential Distributions (CERN-2012-002), and Handbook of LHC Higgs Cross Sections: 3. Higgs properties (CERN-2013-004). The current report serves as the baseline reference for Higgs physics in LHC Run 2 and beyond.