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New Physics Effects on Rare Decays B_u^+→π^+■^+■^-, ρ^+■^+■-in a Top Quark two-higgs-doublet model

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Communications in Theoretical Physics 2008年第9期50卷 696-702页

作者： SONG Hai-Zhen LU Lin-Xia LU Gong-Ru Department of Physics Nanyang Normal University Nanyang 473061 China Department of Physics Henan Normal University Xinxiang 453007 China

Using the form factors from light-cone sum rules, we study the branching ratios and forward-backward asymmetries （FBAs） of the exclusive decays Bu^＋→π^＋e^＋e^- and Bu^＋ →ρ^＋e^＋e^- （e= e,μ） in the standard model （SM） and the top quark two-higgs-doublet model （T2HDM）. From the numerical results, we find that the new physics contributions cannot provide very large enhancement to the branching ratios and the theoretical predictions are in good agreement with the SM ones. The T2HDM effects on FBAs of these decays are small. Precision measurements of the dilepton invariant mass distributions, especially in the lower dilepton mass region, and the FBAs in the decays Bu^＋ → π^＋（ρ^＋）e^＋ e^- will greatly help in discriminating among the SM and the new physics models.

关键词： new physics effects rare decay two-higgs-doublet model branching ratio forward-backward asymmetry

Radiative leptonic decay B_c^-→τ^-_τγ in the standard model and the two-higgs-doublet model

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Chinese Physics C 2010年第10期34卷 1570-1575页

作者：谢振兴冯冠秋郭新恒 College of Nuclear Science and Technology Beijing Normal University

We analyze the radiative leptonic Bc decay Bc^-→τ^vτ^-γ in the Standard model and the two- higgs-doublet model using the non-relativistic constituent quark model. The results confirm that this channel is experimentally promising in view of the large number of Bc mesons which are expected to be produced at future hadron facilities. We also find that this decay is sensitive to the parameters of the two-higgs-doublet model, and it can be tested in future experiments.

关键词： radiative decay standard model two-higgs-doublet model branching ratio

Rare decays B_(s,d)~0→e+e^- in a top quark two-higgs-doublet model

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Chinese Physics C 2010年第2期34卷 165-170页

作者：吕林霞张国芳宋金璠鲁公儒 Department of Physics Nanyang Normal University Department of Physics He'nan Normal University

In the framework of T2HDM, we calculated the new physics contributions involving neutral higgs bosons to the branching ratios of ^-Bs,d^0→e^＋e^-（e= e,μ） decays. Comparing the theoretical predictions with the experimental upper-limits, we found that （a） The data of Br（^-Bs,d^0→e^＋e^-） give the upper bound on tanβ： tanβ≤22, while Br（^-Bs^0→e^＋e^-） give tanβ≤12 for fixed δ = 0^0, mH＋ = 350 CeV, mH^0 = 160 GeV, mh^0 = 115 GeV and mA^0 = 120 GeV; （b） A light neutral higgs boson mass mho （mA^0） less than 50 GeV （120 GeV） is excluded by the data of branching ratios for ^-Bs,d^0→e^＋e^-（e = μ） decays with tanβ= 10; （c） The bounds on mh^0 and tanβ, or mA^0 and tanβ are strongly correlated： a smaller （larger） tanβ means a lighter （heavier） neutral higgs boson.

关键词： rare decay branching ratio two-higgs-doublet model new physics

Ba（d）^o-Ba（d）^o Mixing and New Physics Effects in a Top Quark two-higgs doublet model

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Communications in Theoretical Physics 2007年第6期47卷 1099-1105页

作者： LU Lin-Xia XIAO Zhen-Jun Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing 210097 China Department of Physics Nanyang Teacher＇s College Nanyang 473061 China

We calculate the new physics contributions to the neutral Bd^o and Ba^o meson mass splitting △Md and △Ma induced by the box diagrams involving the charged-higgs bosons in the top quark two-higgs doublet model （T2HDM）. Using the precision data, we obtain the bounds on the parameter space of the T2HDM：（a） For fixed MH = 400 GeV and 5= [0°, 60°], the upper bound on tan β is tan β≤ 30 after the inclusion of major theoretical uncertainties; （b） For the case of tan β≤ 20, a light charged higgs boson with a mass around 300 GeV is allowed; and （c） The bounds on tan β and MH are strongly correlated： a smaller （larger） tan β means a lighter （heavier） charged higgs boson.

关键词： B meson mixing new physics effects two-higgs-doublet model

Bs（d）0-■s（d）0 Mixing and New Physics Effects in a Top Quark two-higgs doublet model

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Communications in Theoretical Physics 2007年第6期47卷 1099-1105页

作者： Lü Lin-Xia~(1,2,+) XIAO Zhen-Jun~(1,++)1 Department of Physics and Institute of Theoretical Physics,Nanjing Normal University,Nanjing 210097,China2 Department of Physics,Nanyang Teacher's College,Nanyang 473061,China

We calculate the new physics contributions to the neutral Bd0and Bs0meson mass splitting △Mdand △Msinduced by the box diagrams involving the charged-higgs bosons in the top quark two-higgs doublet model（T2HDM）.Using the precision data,we obtain the bounds on the parameter space of the T2HDM:（a）For fixed MH=400 GeVand δ=[0°,60°],the upper bound on tan β is tan β≤30 after the inclusion of major theoretical uncertainties;（b）Forthe case of tan β≤20,a light charged higgs boson with a mass around 300 GeV is allowed;and（c）The bounds ontan β and MHare strongly correlated:a smaller（larger）tan β means a lighter（heavier）charged higgs boson.

关键词： B meson mixing new physics effects two-higgs-doublet model

two-higgs-doublet models in light of current experiments:a brief review

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Communications in Theoretical Physics 2022年第9期74卷 235-256页

作者： Lei Wang Jin Min Yang Yang Zhang Department of Physics Yantai UniversityYantai 264005China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100049China School of Physics and Microelectronics Zhengzhou UniversityZhengZhou 450001China

We briefly survey several typical CP-conserving two-higgs-doublet models(2HDMs)in light of current *** we derive the masses and couplings of the mass eigenstates from the *** we analyze the constraints from theory and oblique electroweak ***,we delineate the status of 2HDM in light of the LHC searches,the dark matter detections and the muon g-2 measurement.

关键词： two-higgs-doublet model LHC dark matter muon anomalous magnetic moment

Scalar-pseudoscalar pair production at the Large Hadron Collider at NLO+NLL accuracy in QCD

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Chinese Physics C 2021年第12期45卷 8-21页

作者： He-Yi Li Ren-You Zhang Yu Zhang Wen-Gan Ma Ming-Ming Long Shu-Xiang Li State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China School of Physics and Materials Science Anhui UniversityHefei 230601China

We thoroughly investigate both transverse momentum and threshold resummation effects on scalar-pseudoscalar pair production via quark-antiquark annihilation at the 13 TeV Large Hadron Collider at QCD NLO+NLL accuracy.A factorization method is introduced to properly supplement the soft-gluon(threshold)resummation contribution from parton distribution functions to the resummed results obtained by the Collins-Soper-Ster-man resummation *** find that the impact of the threshold-resummation improved PDFs is comparable to the resummation effect of the partonic matrix element and can even predominate in high invariant mass ***,the loop-induced gluon-gluon fusion channel in the type-I two-higgs-doublet model is considered in our *** numerical results show that the electroweak production via quark-antiquark annihilation dominates over the gluon-initiated QCD production by 1-2 orders of magnitude.

关键词： scalar-pseudoscalar pair production two-higgs-doublet model resummation