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7 papers · 2 filters
Semileptonic transition in three--point QCD sum rules and HQET with gluon condensate corrections
N. Ghahramany, R. Khosravi, K. Azizi
Taking into account the gluon condensate contributions, the form factors of the semileptonic transition with are calculated in the framework of the…
Semileptonic and nonleptonic decays in three--point QCD sum rules and factorization approach
R. Khosravi, K. Azizi, N. Ghahramany
We analyze the semileptonic transition with , in the framework of the three--point QCD sum rules and the nonleptonic decay within the Q…
Double-Lepton Polarization Asymmetries in $B_s \rar ϕ\ell^+ \ell^-$ Decay in the Fourth-Generation Standard Model
S. M. Zebarjad, F. Falahati, H. Mehranfar
In this paper, we investigate the effects of the fourth generation of quarks on the double-lepton polarization asymmetries in the $B_s \rar ϕ\ell^+ \ell^-$ decay. It is shown that…
Analysis of the and decays within the factorization approach in QCD
K. Azizi, R. Khosravi, F. Falahati
Using the factorization approach and considering the contributions of the current-current, QCD penguin and electroweak penguin operators at the leading approximation, the decay amp…
Analysis of the rare semileptonic $B_c \rar P(D,D_s) l^{+}l^{-}/ν\barν$ decays within QCD sum rules
K. Azizi, R. Khosravi
Considering the gluon condensate corrections, the form factors relevant to the semileptonic rare $B_c \rar D,D_s(J^{P}=0^{-}) l^{+}l^{-}$ with and $B_c \rar D,D_s(J^{P}=0…
Heavy Quark Vacuum Polarization Function at O(alpha_s^2) and O(alpha_s^3)
Andre H. Hoang, Vicent Mateu, S. Mohammad Zebarjad
We determine the full mass and dependence of the heavy quark vacuum polarization function and its contribution to the total cross section at ${\cal O}(α_s^2…