Using the form factors from light-cone sum rules,we study the branching ratios and forward-backwardasymmetries (FBAs) of the exclusive decays B_u^+→π^+■^+■^-, ρ^+■^+■-(= e,μ) in the standard model (SM) andthe ...Using the form factors from light-cone sum rules,we study the branching ratios and forward-backwardasymmetries (FBAs) of the exclusive decays B_u^+→π^+■^+■^-, ρ^+■^+■-(= e,μ) in the standard model (SM) andthe top quark two-Higgs-doublet model (T2HDM).From the numerical results,we find that the new physics contributionscannot provide very large enhancement to the branching ratios and the theoretical predictions are in good agreementwith the SM ones.The T2HDM effects on FBAs of these decays are small.Precision measurements of the dileptoninvariant mass distributions,especially in the lower dilepton mass region,and the FBAs in the decays B_u^+→π^++(ρ^+)■^+■^-will greatly help in discriminating among the SM and the new physics models.展开更多
We calculate the contributions to the rare B-decays,B→Xs,d vv and Bs,d→l+l-from the unit-charged technipions.Within the considered parameter space we find that:(a)the enhancements to the branching ratios in question...We calculate the contributions to the rare B-decays,B→Xs,d vv and Bs,d→l+l-from the unit-charged technipions.Within the considered parameter space we find that:(a)the enhancements to the branching ratios in question can be as large as three orders of magnitude;(b)the ALEPH data of B→Xsvv lead to strong mass bounds on mpl and mp8:mp8≥620,475 GeV for FQ=40 GeV and mpl=100,400 GeV,respectively;(c)the CDF data of Bs→μμlead to a relatively weak limit:mp8≥320 GeV for FQ=40 GeV and mpl=200 GeV.展开更多
基金The project partly supported by National Natural Science Foundation of China under Grant No. 10575052 and the Specialized Research Fund for the Doctoral Program of Higher Education （SRFDP） under Grant No. 20050319008.Acknowledgments 0ne of the authors Lin-Xia Lü would like to thank Prof. C.S. Huang for his valuable help.
基金National Natural Science Foundation of China under Grant No.10575052the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) under Grant No.20050319008the Special Study Foundation of Nanyang Normal University under Grant No.nynu200750
文摘Using the form factors from light-cone sum rules,we study the branching ratios and forward-backwardasymmetries (FBAs) of the exclusive decays B_u^+→π^+■^+■^-, ρ^+■^+■-(= e,μ) in the standard model (SM) andthe top quark two-Higgs-doublet model (T2HDM).From the numerical results,we find that the new physics contributionscannot provide very large enhancement to the branching ratios and the theoretical predictions are in good agreementwith the SM ones.The T2HDM effects on FBAs of these decays are small.Precision measurements of the dileptoninvariant mass distributions,especially in the lower dilepton mass region,and the FBAs in the decays B_u^+→π^++(ρ^+)■^+■^-will greatly help in discriminating among the SM and the new physics models.
基金Supported by the National Natural Science Foundation of China under Grant No.19575015the Sino-British Friendship Scholarship Scheme。
文摘We calculate the contributions to the rare B-decays,B→Xs,d vv and Bs,d→l+l-from the unit-charged technipions.Within the considered parameter space we find that:(a)the enhancements to the branching ratios in question can be as large as three orders of magnitude;(b)the ALEPH data of B→Xsvv lead to strong mass bounds on mpl and mp8:mp8≥620,475 GeV for FQ=40 GeV and mpl=100,400 GeV,respectively;(c)the CDF data of Bs→μμlead to a relatively weak limit:mp8≥320 GeV for FQ=40 GeV and mpl=200 GeV.
