Right-handed current contribution to B->X_ulnu decays and non-trivial topology in QCD vacuum
Title：Right-handed current contribution to B->X_ulnu decays and non-trivial topology in QCD vacuum
Time：2022/09/19 (Mon.) 12:30
Place：R517, New Physics Building, NTU
We study violation of quark-hadron duality for B->X_ulnu decays in the presence of the right-handed current (RHC). In this case, it is shown that the fermionic zero mode of an intermediate light quark, which is induced by an instanton, gives a non-vanishing contribution owing to its chirality structure. Within a certain approximation relying on the single instanton, the finite distance singularity, causing violation of quark-hadron duality, is extracted analytically. As a result, it is shown that duality violation for the lepton energy distribution in B->X_ulnu decays is possibly comparable to the chirally-suppressed perturbative contribution in the RHC, for a particular region in the phase space.