Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top qua...Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).展开更多
The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)...The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.展开更多
During the past few years,signs of lepton flavor universality(LFU)violation have been observed in b→cτ■ and b→sl+l-transitions.Recently,the D* and τ polarization fractions P_L^D* and P_L~τ in B→D*τ■decay were...During the past few years,signs of lepton flavor universality(LFU)violation have been observed in b→cτ■ and b→sl+l-transitions.Recently,the D* and τ polarization fractions P_L^D* and P_L~τ in B→D*τ■decay were likewise measured by the Belle collaboration.Motivated by these intriguing results,we revisit the RD(*)and RK(*) anomalies in a scalar leptoquark(LQ)model,where two scalar LQs,one of which is a S U(2)L singlet and the other a S U(2)L triplet,are introduced simultaneously.We consider five b→ cτ■ mediated decays,B→D(*)τ■,B^c→ηcτ■,Bc→J/ψt■,and ∧_b→∧_cτ■,and focus on the LQ effects on the q^2 distributions of the branching fractions,LFU ratios,and various angular observables in these decays.Under the combined constraints of the available data on RD(*),RJ/ψ,P_L~τ(D*),and pLD*,we perform scans for the LQ couplings and make predictions for a number of observables.Numerically it is found that both the differential branching fractions and LFU ratios are largely enhanced by the LQ effects,with the latter expected to provide testable signatures at the SuperKEKB and High-Luminosity LHC experiments.展开更多
基金Supported by an appointment to the Young Scientist Training Program at the APCTP through the Science and Technology Promotion Fund and Lottery Fund of the Korean Governmentsupported by the Korean Local Governments-Gyeongsangbuk-do Province and Pohang City
文摘Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).
基金Supported by an appointment to the Young Scientist Training Program at the APCTP through the Science and Technology Promotion FundLottery Fund of the Korean Governmentsupported by the Korean Local Governments-Gyeongsangbuk-do Province and Pohang City。
文摘The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.
基金Supported by the National Natural Science Foundation of China(11775092,11521064,11435003,11805077)supported in part by the startup research funding from CCNU
文摘During the past few years,signs of lepton flavor universality(LFU)violation have been observed in b→cτ■ and b→sl+l-transitions.Recently,the D* and τ polarization fractions P_L^D* and P_L~τ in B→D*τ■decay were likewise measured by the Belle collaboration.Motivated by these intriguing results,we revisit the RD(*)and RK(*) anomalies in a scalar leptoquark(LQ)model,where two scalar LQs,one of which is a S U(2)L singlet and the other a S U(2)L triplet,are introduced simultaneously.We consider five b→ cτ■ mediated decays,B→D(*)τ■,B^c→ηcτ■,Bc→J/ψt■,and ∧_b→∧_cτ■,and focus on the LQ effects on the q^2 distributions of the branching fractions,LFU ratios,and various angular observables in these decays.Under the combined constraints of the available data on RD(*),RJ/ψ,P_L~τ(D*),and pLD*,we perform scans for the LQ couplings and make predictions for a number of observables.Numerically it is found that both the differential branching fractions and LFU ratios are largely enhanced by the LQ effects,with the latter expected to provide testable signatures at the SuperKEKB and High-Luminosity LHC experiments.
