Specialized data-taking and data-processing techniques were introduced by the CMS
experiment in Run 1 of the CERN LHC to enhance the sensitivity of searches for new …

We review the current status and implications of the anomalies (ie deviations from the
Standard Model predictions) in semi-leptonic B meson decays, both in the charged and in …

A bstract Rare b hadron decays are considered excellent probes of new semileptonic four-
fermion interactions of microscopic origin. However, the same interactions also correct the …

The LHCb Collaboration has recently released a new study of B+→ K+ ℓ+ ℓ-and B→ K* 0 ℓ+
ℓ-(ℓ= e, μ) decays, testing lepton universality with unprecedented accuracy using the whole …

We discuss the impact of the recent LHCb update on the two lepton-flavour universality
ratios RK and RK∗, and the CMS update of B (B s→ μ+ μ-) regarding the possibility of New …

Recently, Belle II reported on the first measurement of B (B±→ K±ν ν¯) which appears to be
almost 3σ larger than predicted in the Standard Model. We point out the important …

The standard model (SM) of particle physics is the mathematical description of the
fundamental constituents and interactions of matter. Its last missing particle, the Higgs …

We discuss the status of b→ s ℓ+ ℓ-decays in the post-RK (*) era. The recent LHCb update of
RK and RK* measurements, which are now compatible with the Standard Model, constrain …

A bstract We propose a tri-hypercharge (TH) extension of the Standard Model (SM) in which
a separate gauged weak hypercharge is associated with each fermion family. In this way …

A bstract Measurements of b→ sμ+ μ− transitions indicate that there may be a new physics
field coupling to di-muon pairs associated with the b to s flavour transition. Including the …