In the Standard Model (SM), the coupling of the electroweak gauge bosons to the leptons is lepton flavour universal. Tests of this property constitute sensitive probes for new physics models that violate lepton flavour universality. Recent tests of lepton universality in rare $b\to s\ell\ell$ decays and semileptonic $b\to c\tau\bar{\nu}_\tau$ transitions have shown some tensions with the...
I will present a model able to accommodate the recent experimental hints of lepton-flavor non-universality in B decays while, at the same time, providing an explanation to the Standard Model flavor hierarchies. The model contains a rich spectrum of new states at the TeV scale that can be probed by the high-pT experiments at the LHC, and predicts interesting low-energy signatures that could be...
The b->sll and b->ctaunu processes recently observed by the LHCb collaboration have exhibited a coherent set of deviations from the SM predictions. These anomalies might be well explained by leptoquarks (LQ) at the mass scale of O(1)TeV. In this talk, recent CMS searches for LQ will be reviewed, in light of the B-anomalies, and discuss about future prospect.
The LHCb measurement of the μ/e ratio RK indicates a deficit with respect to the Standard Model prediction, supporting earlier hints of lepton universality violation observed in the RK ratio. We show that the RK and RK() ratios alone constrain the chiralities of the states contributing to these anomalies, and we find deviations from the Standard Model at the 4σ level. This conclusion is...
The BESIII experiment at the Beijing Electron Positron Collider(BepcII) accumulated the world's largest e+ e- collision samples at 3.773 and 4.178 GeV. From analyses of D^{0(+)}-> K l+ nu and Ds+ -> l+ nu decays, we determine the CKM mattrix element |Vcs|, The form factors of D^{0(+)} semi-leptonic decays f_{K^{+(0)}}, the Ds+ decat constants f_{D_{s}^{+}}. The measured |Vcs| is important to...
The decay K+->pi+nunu with a very precisely predicted branching ratio of less than 10^-10 is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the K+->pi+nn with a decay-in-flight technique, novel for this channel. NA62 has taken data firstly in 2016 with the aim to...
The purpose of the J-PARC KOTO experiment is to study the $K_L\rightarrow \pi^0 \nu \bar{\nu}$ decay.
This rare decay is known as a “golden mode” to search for new physics beyond the Standard Model (SM) because it violates the CP symmetry directly, it is strongly suppressed in the SM (BR ~ $3\times10^{-11}$)[1], and its theoretical uncertainty is small (~2%).
The upper limit of the branching...
