DOI： 10.1103/PhysRevD.111.035023

DOI： 10.22323/1.476.0414

Publisher：Journal of High Energy Physics  

We perform a global statistical analysis of the two-Higgs-doublet model with generic sources of flavour violation using GAMBIT. This is particularly interesting in light of deviations from the Standard Model predictions observed in b→cτν¯ and b → sℓ+ℓ− transitions as well as the indications for a charged Higgs with a mass of 130 GeV in top quark decays. Including all relevant constraints from precision, flavour and collider observables, we find that it is possible to simultaneously explain both the charged and neutral current B anomalies. We study the impact of using different values for the W mass and the Standard Model prediction for the anomalous magnetic moment of the muon and provide predictions for observables that can probe our model in the future such as lepton flavour violation searches at Belle II and Higgs coupling strength measurements at the high-luminosity LHC.

DOI： 10.1007/JHEP11(2024)133

Web of Science

Scopus

Publisher：Physical Review D  

The measurements of the lepton flavor universality (LFU) in B(B¯→D(∗)lν¯) indicate a significant deviation from the standard model prediction at a 3-4σ level, revealing a violation of the LFU (RD(∗) anomaly). It is known that the RD(∗) anomaly can be easily accommodated by an SU(2)L-singlet vector leptoquark (LQ) coupled primarily to third-generation fermions, whose existence is further motivated by a partial gauge unification. In general, such a LQ naturally leads to additional CP-violating phases in the LQ interactions. In this paper, we point out that the current RD(∗) anomaly prefers the CP-violating interaction although B(B¯→D(∗)lν¯) are CP-conserving observables. The CP-violating LQ predicts a substantial size of the bottom-quark electric dipole moment (EDM), the chromo-EDM, and also the tau-lepton EDM. Eventually at low energy, the nucleon and electron EDMs are radiatively induced. Therefore, we conclude that the RD(∗) anomaly with the SU(2)L-singlet vector LQ provides unique predictions: neutron and proton EDMs with opposite signs and a magnitude of O(10-27) e cm, and suppressed electron EDM. Furthermore, we show that a similar EDM pattern is predicted in an SU(2)L-doublet scalar LQ scenario that can accommodate the RD(∗) anomaly as well. These EDM signals could serve as crucial indicators in future experiments.

DOI： 10.1103/PhysRevD.110.075008

Web of Science

Scopus

Publisher：Physical Review D  

Recently, several new experimental results of the test of lepton flavor universality (LFU) in B → D(∗) semileptonic decays were announced: the first result of RD from the LHCb run 1 data, the first results of RD and RD∗ from the LHCb run 2 data, and the first result of RD∗ from the Belle II collaboration. Including these new data, a global analysis still prefers the violation of the LFU between the tau and light leptons. A new world average of the data from the BABAR, LHCb, Belle, and Belle II collaborations is RD = 0.342 ± 0.026 and RD∗ = 0.287 ± 0.012. Including this new data, we update a circumstance of the b → cτν̄ measurements and their implications for new physics (NP). Incorporating recent developments for the B → D(∗) form factors in the Standard Model, we observe a 4.4σ deviation from the Standard Model prediction. Our updates also include model-independent NP formulas for the related observables and the global fittings of parameters for leptoquark scenarios as well as single NP operator scenarios. Furthermore, we show future potential to indirectly distinguish different NP scenarios with the use of the precise measurements of the polarization observables in B → D(∗)τν̄ at the Belle II and the high-pT flavored-tail searches at the LHC. We also discuss an impact on the LFU violation in ϒ → l+l−

DOI： 10.1103/PhysRevD.110.075005

Web of Science

Scopus

Total pages：10