We examine various direct and indirect constraints on the lepton-specific two-Higgs doublet model and discuss its phenomenology at colliders in the allowed parameter space.The constraints we consider come from the pre...We examine various direct and indirect constraints on the lepton-specific two-Higgs doublet model and discuss its phenomenology at colliders in the allowed parameter space.The constraints we consider come from the precision electroweak data,the direct search for Higgs boson,the muon anomalous magnetic moment,as well as some theoretical consistency requirements.We find that in the allowed parameter space the CP-odd Higgs boson A is rather light(m A【30 GeV with 95%possibility),which is composed dominantly by the leptonic Higgs and decays dominantly intoτ+τ;while the SM-like Higgs boson h(responsible largely for electroweak symmetry breaking)decays dominantly in the mode h→AA→4τwith a large decay width,which will make the Higgs discovery more difficult at the LHC.Whereas,this scenario predicts rare Z decays Z→AAA and Z→τ+τA with their branching ratios ranging from 10-8 to 10-and 10-5 to 10-4 respectively,which may be accessible at the GigaZ option of the ILC.展开更多
In 2022,the collider detector at Fermilab(CDF)collaboration reported the W-boson mass(MW=80.4335±0.0094GeV),which deviates from the standard model(SM)prediction(M_(W)^(SM)=80.357±0.006GeV)by~7σ.In contrast,...In 2022,the collider detector at Fermilab(CDF)collaboration reported the W-boson mass(MW=80.4335±0.0094GeV),which deviates from the standard model(SM)prediction(M_(W)^(SM)=80.357±0.006GeV)by~7σ.In contrast,the CMS collaboration obtained MW=80.3602±0.0099GeV,which was very close to the SM global electroweak fit value of∼80.357GeV.Motivated by this situation,we reassess the W-boson mass within the lepton-specific two Higgs doublet model(LS-2HDM).To this end,we perform random scans(generated with SARAH 4.13.0 and evaluated with SPheno 4.0.3)and confront the results with up-to-date theoretical and experimental constraints.The scan enforces vacuum stability,perturbative unitarity,and perturbativity;electroweak precision observables via the oblique parameters(S,T,U);LEP bounds on H^(±);rare B-meson decays;lepton flavor universality(LFU)in Z andτdecays;and 13 TeV LHC searches for additional Higgs bosons.Viable points are further tested with HiggsTools(HiggsSignals+HiggsBounds).In the LS-2HDM,if h_(1)is the SM-like Higgs at m_(h1)≃125 GeV with|cos(β−α)|≲0.06,17≲tanβ≲39,144≲m_(h2)≲414 GeV,and 435≲mA,H±≲685 GeV,the model reproduces the 2024 CMS W-boson mass within 3σ.Solutions near the 2022 CDF value(M_(W)=80.4335±0.0094GeV)survive;however,after applying all constraints,including HiggsTools,they approach it at best within≲2σ.Our findings emphasize that LS-2HDM favors the CMS results consistently with the current experimental results.Although one can theoretically accommodate the CDF results in this model,up-to-date electroweak precision bounds on oblique parameters(S,T,U)with the SM-like Higgs and LFU constraints exclude these solutions.Our results for W-boson mass can only be as close as about 2σ to the CDF results.展开更多
基金supported in part by the National Natural Science Foundation of China(NNSFC)(Grant Nos.10505007,10821504,10725526 and 10635030)HASTIT(Grant No.2009HASTIT004)the Project of Knowledge Innovation Program(PKIP)of Chinese Academy of Sciences(Grant No.KJCX2.YW.W10)
文摘We examine various direct and indirect constraints on the lepton-specific two-Higgs doublet model and discuss its phenomenology at colliders in the allowed parameter space.The constraints we consider come from the precision electroweak data,the direct search for Higgs boson,the muon anomalous magnetic moment,as well as some theoretical consistency requirements.We find that in the allowed parameter space the CP-odd Higgs boson A is rather light(m A【30 GeV with 95%possibility),which is composed dominantly by the leptonic Higgs and decays dominantly intoτ+τ;while the SM-like Higgs boson h(responsible largely for electroweak symmetry breaking)decays dominantly in the mode h→AA→4τwith a large decay width,which will make the Higgs discovery more difficult at the LHC.Whereas,this scenario predicts rare Z decays Z→AAA and Z→τ+τA with their branching ratios ranging from 10-8 to 10-and 10-5 to 10-4 respectively,which may be accessible at the GigaZ option of the ILC.
基金supported in part by the Turkish Energy,Nuclear and Mineral Research Agency under project number 2022TENMAK(CERN)A5.H3.F2-02。
文摘In 2022,the collider detector at Fermilab(CDF)collaboration reported the W-boson mass(MW=80.4335±0.0094GeV),which deviates from the standard model(SM)prediction(M_(W)^(SM)=80.357±0.006GeV)by~7σ.In contrast,the CMS collaboration obtained MW=80.3602±0.0099GeV,which was very close to the SM global electroweak fit value of∼80.357GeV.Motivated by this situation,we reassess the W-boson mass within the lepton-specific two Higgs doublet model(LS-2HDM).To this end,we perform random scans(generated with SARAH 4.13.0 and evaluated with SPheno 4.0.3)and confront the results with up-to-date theoretical and experimental constraints.The scan enforces vacuum stability,perturbative unitarity,and perturbativity;electroweak precision observables via the oblique parameters(S,T,U);LEP bounds on H^(±);rare B-meson decays;lepton flavor universality(LFU)in Z andτdecays;and 13 TeV LHC searches for additional Higgs bosons.Viable points are further tested with HiggsTools(HiggsSignals+HiggsBounds).In the LS-2HDM,if h_(1)is the SM-like Higgs at m_(h1)≃125 GeV with|cos(β−α)|≲0.06,17≲tanβ≲39,144≲m_(h2)≲414 GeV,and 435≲mA,H±≲685 GeV,the model reproduces the 2024 CMS W-boson mass within 3σ.Solutions near the 2022 CDF value(M_(W)=80.4335±0.0094GeV)survive;however,after applying all constraints,including HiggsTools,they approach it at best within≲2σ.Our findings emphasize that LS-2HDM favors the CMS results consistently with the current experimental results.Although one can theoretically accommodate the CDF results in this model,up-to-date electroweak precision bounds on oblique parameters(S,T,U)with the SM-like Higgs and LFU constraints exclude these solutions.Our results for W-boson mass can only be as close as about 2σ to the CDF results.
