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Title: | 在 Belle 實驗中尋找 B0 介子衰變至 X(3872) γ 之分析 Search for B0 → X(3872) γ at Belle experiment |
Authors: | Pin-Chun Chou 周品君 |
Advisor: | 張寶棣(Pao-Ti Chang) |
Keyword: | B 介子,稀有 B 衰變,Belle 實驗,X(3872), B meson,rare B decay,Belle experiment,X(3872), |
Publication Year : | 2019 |
Degree: | 碩士 |
Abstract: | 本篇論文在 Belle 實驗中尋找 B0 → X(3872)(→ J/ψ π+ π−)γ 之衰變。分析數據來自日本高能加速器研究機構 B 介子工廠(KEKB)在能量不對稱之正負電子對撞器中所蒐集,來自 Υ(4S) 衰變的 772 百萬 BB ̄ 介子對,其積分亮度為 711 fb^−1。本篇論文量測結果中並沒有發現顯著性的訊號,並得到了 90% 信心水準之下的衰變分支上限值為 B(B0 → X(3872) γ) × B(X(3872) → J/ψ π+ π−) < 5.1 × 10^−7。 We report the results of a search for the decay B0 → X(3872)(→ J/ψ π+ π−)γ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb^−1 and containing 772 × 10^6 BB ̄ pairs, collected with the Belle detector at the KEKB asymmetric-energy e+e- collider running at the Υ(4S) resonance energy. We find no evidence for a signal and place an upper limit of B(B0 → X(3872) γ) × B(X(3872) → J/ψ π+ π−) < 5.1 × 10^−7 at 90% confidence level. |
URI: | http://tdr.lib.ntu.edu.tw/handle/123456789/738 |
DOI: | 10.6342/NTU201901047 |
Fulltext Rights: | 同意授權(全球公開) |
Appears in Collections: | 天文物理研究所 |
Files in This Item:
File | Size | Format | |
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ntu-108-1.pdf | 48.63 MB | Adobe PDF | View/Open |
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