B介子纯轻衰变Bc→lv(l=e,μ)过程由于螺旋度压低导致衰变分支比很小,以致于实验上无法观测到.但人们在新物理模型:双Higgs模型下分析纯轻过程发现该过程对新物理很敏感,我们分别在标准模型和双Higgs模型下对Bc介子的辐射衰变Bc-→τ--ντγ进行了研究,发现辐射衰变受新物理影 B meson pure light decay Bc → lv (l = e, μ) process due to the spiral low degree of decay caused by the branching ratio is small, so experimentally can not be observed.But people in the new physics model: Double Higgs model analysis of pure light process We found that this process is sensitive to the new physics. We study the Bc- → τ - ντγ of the Bc meson in the standard model and the double Higgs model respectively and find that the radiation decay is affected by the new physical phenomenon