検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

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

Belle実験における$$B^0to D^{*-}ell^ {+} nu_ell$$崩壊を利用したCKM行列要素$$|V_{cb}|$$の測定

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

Waheed, E.*; Tanida, Kiyoshi; Belle Collaboration*; 187 of others*

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 $$mathcal{F}(1)$$ 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 $$B$$ 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.

Access

:

- Accesses

InCites™

:

パーセンタイル:49.94

分野:Astronomy & Astrophysics

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.