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論文

Measurement of the CKM matrix element $|V_{cb}|$ from $B^0to D^{*-}ell^ {+} nu_ell$ at Belle

Waheed, E.*; 谷田聖; Belle Collaboration*; 他187名*

Physical Review D, 100(5), p.052007_1 - 052007_32, 2019/09

https://doi.org/10.1103/PhysRevD.100.052007

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 $|V_{cb}|$ from $B^{0} rightarrow D^{*}ell nu$ decays, reconstructed with full Belle data set ( $711 , rm fb^{-1}$ ). Two form factor parameterisations, based on work by the CLN and BGL groups, are used to extract the product $mathcal{F}(1)eta_{rm EW}|V_{cb}|$ and the decay form factors, where is the factor normalisation and $eta_{rm EW}$ is a small electroweak correction. In the CLN parameterisation we find $mathcal{F}(1)eta_{rm EW}|V_{cb}| = (35.06 pm 0.15 pm 0.54) times 10^{-3}$ , $rho^{2}=1.106 pm 0.031 pm 0.007$ , $R_{1}(1)=1.229 pm 0.028 pm 0.009$ , $R_{2}(1)=0.852 pm 0.021 pm 0.006$ . In the BGL parameterisation we find $mathcal{F}(1)eta_{rm EW}|V_{cb}|= 38.73 pm 0.25 pm 0.60$ , which is higher but consistent with the determination from inclusive semileptonic decays when correcting for $mathcal{F}(1)eta_{rm EW}$ . This is the most precise measurement of $mathcal{F}(1)eta_{rm EW}|V_{cb}|$ and form factors that has ever been carried out, and the first direct study of the BGL form factor parameterisation in an experimental measurement.