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Measurements of isospin asymmetry and difference of direct $$CP$$ asymmetries in inclusive $$B to X_s gamma$$ decays

インクルーシブ$$B to X_s gamma$$崩壊における直接$$CP$$非対称性の違いとアイソスピン非対称性の測定

綿貫 峻*; 谷田 聖   ; Belle Collaboration*; 他175名*

Watanuki, Shun*; Tanida, Kiyoshi; Belle Collaboration*; 175 of others*

We report measurements of isospin asymmetry $$Delta_{0-}$$ and difference of direct $$CP$$ asymmetries $$Delta A_{CP}$$ between charged and neutral $$B to X_s gamma$$ decays. This analysis is based on the data sample containing $$772 times 10^6 Bbar{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $$e^+ e^-$$ collider. Using a sum-of-exclusive technique with invariant $$X_s$$ mass up to 2.8 GeV/$$c^2$$, we obtain $$Delta_{0-} = bigl[-0.48 pm 1.49 {rm (stat.)} pm 0.97 {rm (syst.)} pm 1.15 {(f_{+-}/f_{00})}bigr]$$% and $$Delta A_{CP} = bigl[+3.69 pm 2.65 {rm (stat.)} pm 0.76{rm (syst.)}bigr]$$%, where the last uncertainty for $$Delta_{0-}$$ is due to the uncertainty on the production ratio of $$B^+B^-$$ to $$B^0bar{B}^0$$ in $$Upsilon(4S)$$ decays. The measured value of $$Delta_{0-}$$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $$B to X_s gamma$$, and improve the branching fraction prediction. The result for $$Delta A_{CP}$$ is consistent with the prediction of the SM. We also measure the direct $$CP$$ asymmetries for charged and neutral $$B to X_s gamma$$ decays. All the measurements are the most precise to date.

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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99

号

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3

ページ数

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p.032012_1 - 032012_13

発行年月

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2019/02

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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CP対称性の破れ

特許データ

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PDF

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AA2019-0536.pdf:0.41MB

論文URL

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https://doi.org/10.1103/PhysRevD.99.032012

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：60.85

分野：Astronomy & Astrophysics

Altmetrics

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