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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣 | |
| dc.contributor.author | Cheng-Hsun Wu | en |
| dc.contributor.author | 吳政勳 | zh_TW |
| dc.date.accessioned | 2021-06-13T03:48:18Z | - |
| dc.date.available | 2006-07-27 | |
| dc.date.copyright | 2006-07-27 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-26 | |
| dc.identifier.citation | [1] http://en.wikipedia.org/wiki/StandardModel
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32420 | - |
| dc.description.abstract | We study the baryonic charmonium decays of B mesons, B+ to etac K+ and B+ to J/psi K+, where the etac and J/psi subsequently decay into a p pbar or Lambda Lambdabar pair. We measure the J/psi to p pbar, Lambda Lambdabar anisotropy parameters, alpha_B = -0.60 +- 0.13 +-0.14 (p pbar), -0.44 +- 0.51 +- 0.31 (Lambda Lambdabar) and compare to results from e+e- to J/psi formation experiments. We also report the first observation of etac to Lambda Lambdabar. The measured branching fraction is B(etac to Lambda Lambdabar) = (0.87 +0.24 -0.21(stat) +0.09 -0.14(syst) +- 0.27 (PDG)) x 10^-3. This study is based on a 357 fb^-1 data sample recorded on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T03:48:18Z (GMT). No. of bitstreams: 1 ntu-95-R92222067-1.pdf: 7374920 bytes, checksum: 659c986219e53e02798b5c68971f56bf (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | 1 Introduction
1.1 The Standard Model . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Fundamental particles . . . . . . . . . . . . . . . . . . 1 1.1.2 The CKM matrix . . . . . . . . . . . . . . . . . . . . . 3 1.2 B mesons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Etac and J/psi mesons . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4 J/psi and etac decay into baryon-antibaryon pairs . . . . . . . . 6 1.5 Thesis outline . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 Analysis Method 2.1 B candidate selection . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Background Suppression technique . . . . . . . . . . . . . . . 10 2.2.1 Super Fox-Wolfram Moments . . . . . . . . . . . . . . 10 2.2.2 Cos_thetathrust and Spher . . . . . . . . . . . . . . . . . . . . 11 2.2.3 Fisher discrimination . . . . . . . . . . . . . . . . . . . 12 2.2.4 Information from Upsilon(4S) decay . . . . . . . . . . . . . . 12 2.3 Likelihood Ratio . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3.1 Definition . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3.2 Optimization of likelihood ratio cut . . . . . . . . . . . 14 2.4 Chisq2 and likelihood fits . . . . . . . . . . . . . . . . . . . . . . . 15 2.5 Branching fraction determination . . . . . . . . . . . . . . . . 16 2.5.1 Systematic error study . . . . . . . . . . . . . . . . . . 16 3 J/psi decays into baryon-antibaryon pairs angular distributions 18 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.2 Particle Selection . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2.1 Proton and Kaon selection . . . . . . . . . . . . . . . . 19 3.2.2 Good ¤ reconstruction . . . . . . . . . . . . . . . . . . 20 3.2.3 B reconstruction . . . . . . . . . . . . . . . . . . . . . 20 3.3 Data sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4 Background suppression . . . . . . . . . . . . . . . . . . . . . 22 3.5 Invariant mass spectra and Dalitz plots . . . . . . . . . . . . . 23 3.5.1 Mpp and MLL spectra . . . . . . . . . . . . . . . . . . . 23 3.5.2 Dalitz plots . . . . . . . . . . . . . . . . . . . . . . . . 23 3.6 J/psi decay angle distributions . . . . . . . . . . . . . . . . . . 25 3.6.1 Previous measurements . . . . . . . . . . . . . . . . . . 25 3.6.2 J/psi to ppbar . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.6.3 J/psi to Lambda Lambdabar . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.6.4 Toy Monte Carlo study . . . . . . . . . . . . . . . . . . 27 3.6.5 Efficiency study . . . . . . . . . . . . . . . . . . . . . . 27 3.6.6 Check on ´c and Kaon decay angle distribtuion . . . . 28 3.7 Systematic uncertainty . . . . . . . . . . . . . . . . . . . . . . 34 3.8 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4 Observation of etac to Lambda Lambdabar ……36 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.2 selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.3 Physics result . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.3. Etac to Lambda Lambdabar branching fraction . . . . . . . . . . . . . . . 38 4.3.Etac width . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.3.3 Branching fractions of charmonium decays into baryonantibaryon pairs . . . . . . . . . . . . . . . . . . . . . . 40 4.4 Systematic uncertainty . . . . . . . . . . . . . . . . . . . . . . 42 4.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5 Conclusions and Prospects 45 5.1 J/psi decay angle distributions . . . . . . . . . . . . . . . . . . 45 5.2 Observation of etac to Lambda Lambdabar . . . . . . . . . . . . . . . . . . . . . 46 5.3 Direct CP violation in B to ppbar, Lambda Lambdabar . . . . 47 A Search for B to K* nu nubar 48 A.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 A.2 Data sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 A.3 Event selection . . . . . . . . . . . . . . . . . . . . . . . . . . 50 A.4 Estimation of signal and background . . . . . . . . . . . . . . 51 A.5 Control Sample . . . . . . . . . . . . . . . . . . . . . . . . . . 56 A.6 Systematic uncertainties . . . . . . . . . . . . . . . . . . . . . 58 A.7 Result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 A.8 Result of tight cut . . . . . . . . . . . . . . . . . . . . . . . . 64 A.9 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 A.10 Event display . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 A.10.1 ExpNo. 7, RunNo. 895, EvtNo. 1296067 . . . . . . . . 70 A.10.2 ExpNo. 41, RunNo. 1019, EvtNo. 6328924 . . . . . . . 70 A.10.3 ExpNo. 43, RunNo. 4, EvtNo. 3870356 . . . . . . . . . 71 A.10.4 ExpNo. 43, RunNo 424., EvtNo. 4803757 (K* gamma candidate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 | |
| dc.language.iso | en | |
| dc.subject | 粒子 | zh_TW |
| dc.subject | 高能 | zh_TW |
| dc.subject | 加速器 | zh_TW |
| dc.subject | 衰變 | zh_TW |
| dc.subject | Accelerator | en |
| dc.subject | J/psi | en |
| dc.subject | etac | en |
| dc.subject | Lambda | en |
| dc.subject | Particle | en |
| dc.subject | Belle | en |
| dc.title | J/psi與etac介子衰變至雙重子之研究與發現 | zh_TW |
| dc.title | Study of J/psi to p pbar, Lambda Lambdabar and observation of etac to Lambda Lambdabar at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 王名儒 | |
| dc.contributor.oralexamcommittee | 侯維恕,郭榮升 | |
| dc.subject.keyword | 加速器,高能,粒子,衰變, | zh_TW |
| dc.subject.keyword | J/psi,etac,Lambda,Particle,Belle,Accelerator, | en |
| dc.relation.page | 87 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-26 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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