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Measurement of lepton mass squared moments in $$B to X_c ell bar nu_{ell}$$ decays with the Belle II experiment

Abudin$'e$n, F.*; 谷田 聖   ; Belle II Collaboration*; 他413名*

Abudin$'e$n, F.*; Tanida, Kiyoshi; Belle II Collaboration*; 413 of others*

We present measurements of the first to fourth moments of the lepton mass squared $$q^2$$ of $$B to X_c , ell, bar nu_{ell}$$ decays for $$ell = e, mu$$ and with $$X_c$$ a hadronic system containing a charm quark. These results use a sample of electron-positron collisions at the $$Upsilon(4S)$$ resonance corresponding to $$62.8 , mathrm{fb}^{-1}$$ of integrated luminosity and collected by the Belle II experiment in 2019 and 2020. To identify the $$X_c$$ system and reconstruct $$q^2$$, one of the $$B$$ mesons from an $$Upsilon(4S) to B kern 0.18emoverline{kern -0.18em B}$$ decay is fully reconstructed in a hadronic decay mode using a multivariate $$B$$ tagging algorithm. We report raw and central moments for $$ q^2 > 1.5 ; mathrm{GeV^2/c^4}$$ up to $$q^2 > 8.5 ; mathrm{GeV^2/c^4}$$, probing up to 77% of the accessible $$B to X_c , ell, bar nu_{ell}$$ phase space. This is the first measurement of moments in the experimentally challenging range of $$[ 1.5, 2.5 ] , mathrm{GeV^2/c^4}$$.

発表言語

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English

掲載資料名

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Physical Review D

巻

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107

号

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7

ページ数

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p.072002_1 - 072002_24

発行年月

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2023/04

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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no keyword

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.107.072002

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

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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Access

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- Accesses

InCites™

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パーセンタイル：77.72

分野：Astronomy & Astrophysics

Altmetrics

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