Semileptonic decays Bc→(ηc,J/Ψ)lv in the perturbative QCD approach

WANG Wen-Fei; FAN Ying-Ying; XIAO Zhen-Jun

doi:10.1088/1674-1137/37/9/093102

Chinese Physics C> 2013, Vol. 37> Issue(9) : 093102 DOI: 10.1088/1674-1137/37/9/093102

Semileptonic decays B_c→(η_c,J/Ψ)lv in the perturbative QCD approach

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Abstract：
In this paper we study the semileptonic decays of B_c^-→(η_c,J/Ψ)l^-v_l. We first evaluate the B_c→(η_c,J/Ψ) transition form factors F₀(q²), F₊(q²), V(q²) and A_0,1,2(q²) by employing the pQCD factorization approach, and then we calculate the branching ratios for all considered semileptonic decays. Based on the numerical results and the phenomenological analysis, we find that: (a) the pQCD predictions for the values of the B_c→η_c and B_c→J/Ψ transition form factors agree well with those obtained by using other methods; (b) the pQCD predictions for the branching ratios of the considered decays are Br(B_c^-→η_c e^-v_e(μ^-v_μ)=(4.41_-1.09^+1.22)×10^-3, Br(B_c^-→η_cτ^-v_τ) =(1.37_-0.34^+0.37)×10^-3, Br(B_c^-→J/Ψ e^-v_e(μ^-v_μ)) =(10.03_-1.18^+1.33)×10^-3, and Br(B_c^-→J/Ψτ^-v_τ) =(2.92_-0.34^+0.40)×10^-3; and (c) we also define and calculate two ratios of the branching ratios R_{η_c} and R_J/Ψ, which will be tested by LHCb and the forthcoming Super-B experiments.

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WANG Wen-Fei, FAN Ying-Ying and XIAO Zhen-Jun. Semileptonic decays B_c→(η_c,J/Ψ)lv in the perturbative QCD approach[J]. Chinese Physics C, 2013, 37(9): 093102. doi: 10.1088/1674-1137/37/9/093102

WANG Wen-Fei, FAN Ying-Ying and XIAO Zhen-Jun. Semileptonic decays B_c→(η_c,J/Ψ)lv in the perturbative QCD approach[J]. Chinese Physics C, 2013, 37(9): 093102. doi: 10.1088/1674-1137/37/9/093102 shu

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Received: 2012-12-14
Revised: 2013-01-22

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沈阳化工大学材料科学与工程学院沈阳 110142

Semileptonic decays B_c→(η_c,J/Ψ)lv in the perturbative QCD approach

Corresponding author: XIAO Zhen-Jun,

Received Date: 2012-12-14

Accepted Date: 2013-01-22

Available Online: 2013-09-05

Abstract: In this paper we study the semileptonic decays of B_c^-→(η_c,J/Ψ)l^-v_l. We first evaluate the B_c→(η_c,J/Ψ) transition form factors F₀(q²), F₊(q²), V(q²) and A_0,1,2(q²) by employing the pQCD factorization approach, and then we calculate the branching ratios for all considered semileptonic decays. Based on the numerical results and the phenomenological analysis, we find that: (a) the pQCD predictions for the values of the B_c→η_c and B_c→J/Ψ transition form factors agree well with those obtained by using other methods; (b) the pQCD predictions for the branching ratios of the considered decays are Br(B_c^-→η_c e^-v_e(μ^-v_μ)=(4.41_-1.09^+1.22)×10^-3, Br(B_c^-→η_cτ^-v_τ) =(1.37_-0.34^+0.37)×10^-3, Br(B_c^-→J/Ψ e^-v_e(μ^-v_μ)) =(10.03_-1.18^+1.33)×10^-3, and Br(B_c^-→J/Ψτ^-v_τ) =(2.92_-0.34^+0.40)×10^-3; and (c) we also define and calculate two ratios of the branching ratios R_{η_c} and R_J/Ψ, which will be tested by LHCb and the forthcoming Super-B experiments.

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Semileptonic decays B_c→(η_c,J/Ψ)lv in the perturbative QCD approach

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