Narrow Results

In this paper, on a talk given at Lawrence Berkeley Laboratory, we discuss higher-order non-perturbative corrections in inclusive semileptonic decays of B mesons. First the generic calculation is reviewed and then we identify the relevant hadronic matrix-elements up to . For a quantitative analysis of these effects, the value of these new matrix-elements is estimated within an approximation scheme. We investigate the role of so-called "intrinsic-charm" operators in this decay, appearing first at order in the heavy-quark expansion. These operators induce an expansion infrared sensitive to the charm quark . Parametrically the power corrections complement the estimate of the potential impact of contributions, which we will explore. In this context, we draw semiquantitative conclusions for the expected scale of valence weak annihilation contribution in semileptonic B decays. Furthermore the effects on the integrated rate and on kinematic moments are then estimated up to .

Leptonic decays of B-mesons are theoretically very clean probes for testing the Standard Model (SM) and possible physics beyond it. Amongst the various leptonic decays of the B-meson, the pure dileptonic decay B → ℓ⁺ ℓ^- is very important, as this mode is helicity suppressed in the SM but can be substantially enhanced in some of the models beyond the SM, such as supersymmetric (SUSY) theories and the two Higgs doublet model (2HDM). Although the purely dileptonic decay mode is helicity suppressed in the SM its associated mode B → ℓ⁺ ℓ^-γ does not have the same suppression, due to the presence of γ in the final state. In this paper we will also analyze the effects of enhanced Z-penguins on these two decay modes.

Motivated by the measured large branching ratio of (the so-called ππ puzzle), we investigate the effects of a family nonuniversal Z′ model on the tree-dominated B → ππ decays. We find that the Z′ coupling parameter with a nontrivial new weak phase , which is relevant to the Z′ contributions to the QCD penguin sector △C₅, is needed to reconcile the observed discrepancy. Combined with the recent fitting results from B → πK, πK* and ρK decays, the Z′ parameter spaces are severely reduced but still not excluded entirely, implying that both the "ππ" and "πK" puzzles could be accommodated simultaneously within such a family nonuniversal Z′ model.

This review summarizes the most important results in B-physics obtained at the Tevatron. They include the discovery of the new B-hadrons, the measurement of their masses and lifetimes, the measurement of the oscillation frequency of meson, the search for its rare decay and the study of the CP asymmetry in decays and mixing of B mesons.

In this paper, recent results in the B-physics field achieved using proton–proton collision data at $\sqrt{s}=8$ and $13$ TeV collected by CMS are presented. They include the angular analysis of the decay $B^{+}\to K^{\ast +}{\mu }^{+}{\mu }^{-}$ with Run 1 data, new measurements of D and B meson production cross-sections and CP violation studies using $B_s^0$ decays with Run 2 data. The results are compared with the Standard Model predictions. A measurement of the CP-violating phase ${\varphi }_s$ achieved by combining results from both Run 1 and Run 2 data is also presented.

An overview of the latest ATLAS studies in B-physics is presented. The potential of this general-purpose LHC detector is compared with the current status of measurements of CP violating effects, mass differences in the meson system and rare B-decay channels. The sensitivity of ATLAS to new physics is also discussed.

The LHCb Experiment is going to search for the contribution of New Physics by studying large statistics samples of b-hadron decays. The key components of the experimental setup are discussed, followed by the overall status of the detector construction. The expected sensitivity is given for a few key channels.