Regular Article - Experimental Physics
Determination of and extraction of from semileptonic decays
Institute of High Energy Physics, Beijing, 100039, People’s Republic of China
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Accepted: 11 December 2014
Published online: 14 January 2015
By globally analyzing all existing measured branching fractions and partial rates in different four momentum transfer-squared bins of decays, we obtain the product of the form factor and magnitude of Cabibbo–Kobayashi–Maskawa matrix element to be . With this product, we determine the semileptonic form factor in conjunction with the value of determined from the standard model global fit. Alternately, with the product together with the input of the form factor calculated in lattice quantum chromodynamics (LQCD) recently, we extract , where the error is still dominated by the uncertainty of the form factor calculated in LQCD. Combining the extracted from all existing measurements of decays and together, we find the most precisely determined to be , which improves the accuracy of the PDG’2014 value by .
© SIF and Springer-Verlag Berlin Heidelberg, 2015