Regular Article - Theoretical Physics
Determinations of the form factors of semileptonic decays and leptoquark constraints
School of Physics and Electronic Technology, Liaoning Normal University, Dalian, 116029, People’s Republic of China
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Accepted: 23 August 2018
Published online: 30 August 2018
By analyzing all existing measurements for () decays, we find that the determinations of both the vector form factor and scalar form factor for semileptonic decays from these measurements are feasible. By taking the parameterization of the one order series expansion of the and , is determined to be , and the shape parameters of and are and , respectively. Combining with the average of and lattice calculaltion, the is extracted to be where the first error is experimental and the second theoretical. Alternatively, the is extracted to be by taking the as the value from the global fit with the unitarity constraint of the CKM matrix. Moreover, using the obtained form factors by lattice QCD, we re-analyze these measurements in the context of new physics. Constraints on scalar leptoquarks are obtained for different final states of semileptonic decays.
© The Author(s), 2018