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Waheed, E.*; 谷田 聖; Belle Collaboration*; 他187名*
Physical Review D, 100(5), p.052007_1 - 052007_32, 2019/09
被引用回数:43 パーセンタイル:91.47(Astronomy & Astrophysics)We present a new measurement of the CKM matrix element from decays, reconstructed with full Belle data set (). Two form factor parameterisations, based on work by the CLN and BGL groups, are used to extract the product and the decay form factors, where is the factor normalisation and is a small electroweak correction. In the CLN parameterisation we find , , , . In the BGL parameterisation we find , which is higher but consistent with the determination from inclusive semileptonic decays when correcting for . This is the most precise measurement of and form factors that has ever been carried out, and the first direct study of the BGL form factor parameterisation in an experimental measurement.