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Title: | 於緊湊渺子線圈質心能量十三兆電子伏特中測量 LambdaB->Jpsi pK 與 LambdaB->Jpsi Lambda0 分支分數比 Measurement of branching fraction ratio of LambdaB->Jpsi pK to LambdaB->Jpsi Lambda0 in pp Collisions at sqrt(s) = 13TeV |
Authors: | Lian-Sheng Tsai 蔡連勝 |
Advisor: | 張寶棣(Pao-Ti Chang) |
Keyword: | 緊湊緲子線圈,底夸克,分支係數,電荷宇稱守恆,高能物理,粒子物理, CMS,bphysics,branching fraction,penta quark,cp asymmetry,charge parity,vertexing,tracking,Lambda,baryon,high energy physics,particle physic, |
Publication Year : | 2020 |
Degree: | 碩士 |
Abstract: | 本研究利用大強子對撞機上的緊湊緲子線圈偵測器測量LambdaB->Jpsi pK
衰變通道對 LambdaB->Jpsi Lambda0 衰變通道的分支分數比。 此次實驗分析中心能量為十三兆電子伏特與 35.798 逆飛靶恩等效累積光度數據量的質子與質子對撞結果回報 測量到的分支分數比為: Br(LambdaB->Jpsi pK+) ------------------------------------------- = 0.964+-0.123(stat.)+-0.071(syst.) Br(LambdaB->Jpsi Lambda0) Br(LambdaBbar->Jpsi pbar K+) ------------------------------------------- = 1.037+-0.139(stat.)+-0.078(syst.) Br(LambdaBbar->Jpsi Lambda0bar) 此外,我們也回報兩個衰變通道中電荷-宇稱對稱的直接測量結果: LambdaB->Jpsi pK = 0.011+-0.064+0.004-0.010 LambdaB->Jpsi Lambda0 = 0.057 +- 0.037 +0.005-0.002 而數據顯示沒有發現電荷-宇稱對稱破壞。 This research measures the branching fraction ratio of LambdaB->Jpsi pK to LambdaB->Jpsi Lambda0 in proton-proton collisions at a centre-of-mass energy sqrt s = 13 TeV, using 35.798 inverse femtobarn integrated luminosity of data recorded with the CMS detector at the Large Hadron Collider. The branching fraction ratios are measured to be Br(LambdaB->Jpsi pK+) ------------------------------------------- = 0.964+-0.123(stat.)+-0.071(syst.) Br(LambdaB->Jpsi Lambda0) Br(LambdaBbar->Jpsi pbar K+) ------------------------------------------- = 1.037+-0.139(stat.)+-0.078(syst.) Br(LambdaBbar->Jpsi Lambda0bar) We also report the direct charge-parity asymmetry A_CP measurement for both channels as LambdaB->Jpsi pK = 0.011+-0.064+0.004-0.010 LambdaB->Jpsi Lambda0 = 0.057 +- 0.037 +0.005-0.002 , which shows that no charge asymmetry is observed in these decay. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64672 |
DOI: | 10.6342/NTU202000578 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 應用物理研究所 |
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ntu-109-1.pdf Restricted Access | 3.3 MB | Adobe PDF |
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