【摘 要】
：
Anomalies in decays induced by b → ce-(v)e(e =e,μ,τ) transitions may imply lepton flavor universality violations,which raises questions on such phenomena in the D decays induced by c → (s,d)e+ve transitions.Cur-rent measurements of the pure leptonic and s
【机 构】
：
Department of Physics,Yantai University,Yantai 264005,China;Institute of Particle Physics and Key La
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Anomalies in decays induced by b → ce-(v)e(e =e,μ,τ) transitions may imply lepton flavor universality violations,which raises questions on such phenomena in the D decays induced by c → (s,d)e+ve transitions.Cur-rent measurements of the pure leptonic and semi-leptonic D decays agree with the standard model (SM) predictions,and such agreements can be used to constrain the new physics (NP) contributions.In this work,we extend SM by as-suming general effective Hamiltonians describing the c → (s,d)e+ve transitions including the full set of the four-fer-mion operators.With the latest experimental data,we perform a least x2 fit of the Wilson coefficient corresponding to each operator.The results indicate that the Wilson coefficients of tensor and scalar operators in the muon sector are in the order of O(10-2) while others are in the order of O(10-3).The lepton flavor universality could be violated by interactions with the scalar operators.We also determine that the pure leptonic decays are significantly sensitive to scalar operators.The effects of NP on the semi-leptonic decays with electron final state are negligible;however,for the decays with the muon final state,the effects of scalar and tensor operators will appear in the forward-back-ward asymmetries and the muon helicity asymmetries of D → Pμ+vμ decays.The future measurements of these de-cays in the BESⅢ and Belle Ⅱ experiments will facilitate the evaluation of NP effects.
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