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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.

使用言語

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English

掲載資料名

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Physical Review D

巻

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100

号

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5

ページ数

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p.052007_1 - 052007_32

発行年月

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2019/09

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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Kobayashi-maskawa Matrix

特許データ

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PDF

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論文URL

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

研究データの公開先DOI

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使用施設

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広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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高エネルギー加速器研究機構

Access

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- Accesses

InCites™

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パーセンタイル：91.47

分野：Astronomy & Astrophysics

Altmetrics

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