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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 王名儒 | |
dc.contributor.author | Cheng-Chieh Peng | en |
dc.contributor.author | 彭政傑 | zh_TW |
dc.date.accessioned | 2021-06-15T04:14:52Z | - |
dc.date.available | 2011-01-21 | |
dc.date.copyright | 2010-01-21 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-01-14 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45336 | - |
dc.description.abstract | 基於KEKB不對稱能量電子正子對撞器在Υ(5S)能量下所收集之23.6fb-1資料,我們對Bs介子的稀有二體衰變進行分析,其中包含K+K-, K-π+,π+π-, K0K0。 我們以5.8個標準差的信心水準觀測到Bs至K+K-的衰變。我們量測到其衰變機率(B)為:
B(Bs -> K+K-) = [3.8 +1.0 -0.9(stat.)±0.7(sys.)]×10-5 另外,因未有明顯訊號,我們給予90%信心水準的衰變機率(B)上限: B(Bs -> K-π+) < 1.2×10-5 B(Bs ->π+π-) < 2.6×10-5 B(Bs -> K0K0) < 6.6×10-5 | zh_TW |
dc.description.abstract | We report measurements of Bs → hh decays, where h stands for a charged or neutral kaon, or a charged pion. These results are obtained using a data sample of 23.6 fb−1 containing 1.25 million B∗sB∗s events collected at theΥ(5S ) resonance at the KEKB asymmetric energy e+e−
collider. We observe the decay Bs → K+ K− and measure its branching fraction, B(Bs → K + K − ) = [3.8 +1.0 −0.9 (stat) ±0.7(syst)] ×10−5 . No significant signals are seen in other decay modes and we set upperlimits at 90% confidence level: B(Bs → K−π+) < 1.2 × 10−5 , B(Bs → π+π− ) < 2.6 × 10 −5 and B(Bs → K0K0 ) < 6.6 × 10 −5. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T04:14:52Z (GMT). No. of bitstreams: 1 ntu-99-R96222063-1.pdf: 11275546 bytes, checksum: b694bb2d1cd179808eb72fb6c623d275 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | 1 Introduction 1
1.1 Particle Physics . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 CP violation . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.2 CKM matrix . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Υ(5S) and Bs mesons . . . . . . . . . . . . . . . . . . . . . . . 4 1.4 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 KEK B-Factory 7 2.1 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Belle Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2.1 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.2.2 Silicon Vertex Detector, SVD . . . . . . . . . . . . . . 14 2.2.3 Extreme Forward Calorimeter, EFC . . . . . . . . . . . 16 2.2.4 Central Drift Chamber, CDC . . . . . . . . . . . . . . 17 2.2.5 Aerogel Cherenkov Counter system, ACC . . . . . . . . 19 2.2.6 Time-of-flight Counter, TOF . . . . . . . . . . . . . . . 21 2.2.7 Electromagnetic Calorimeter, ECL . . . . . . . . . . . 23 2.2.8 KL and muon detection system, KLM . . . . . . . . . 25 3 Analysis Method 27 3.1 Data Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.2 Monte Carlo . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.3 Particle Identification . . . . . . . . . . . . . . . . . . . . . . . 28 3.4 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.4.1 Charged Kaon and Pion Selection . . . . . . . . . . . . 29 3.4.2 Neutral Kaon Selection . . . . . . . . . . . . . . . . . . 30 3.4.3 B reconstruction . . . . . . . . . . . . . . . . . . . . . 30 3.5 Background Study . . . . . . . . . . . . . . . . . . . . . . . . 32 3.5.1 Kakuno Super Fox-Wolfram Moments . . . . . . . . . . 32 3.5.2 Figure of Merit . . . . . . . . . . . . . . . . . . . . . . 33 3.5.3 Lepton Tagging . . . . . . . . . . . . . . . . . . . . . . 38 3.5.4 Unapplied Ideas of Background Suppression . . . . . . 39 3.5.5 Study of Rare B Decays . . . . . . . . . . . . . . . . . 40 3.5.6 B → K+π−background in Bs→ K− π+ mode from B∗ Bπ and BBπ+ π . . . . . . . . . . . . . . . . . . . . 46 3.6 Signal Extraction . . . . . . . . . . . . . . . . . . . . . . . . . 47 3.6.1 Likelihood Fit . . . . . . . . . . . . . . . . . . . . . . . 47 3.6.2 Probability Density Function . . . . . . . . . . . . . . 47 3.6.3 Consistency Check . . . . . . . . . . . . . . . . . . . . 48 4 Physics Result 53 4.1 Fitting result . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.2 Systematic Uncertainties and Efficiency Correction . . . . . . 56 4.2.1 Systematics . . . . . . . . . . . . . . . . . . . . . . . . 56 4.2.2 LR cut systematics . . . . . . . . . . . . . . . . . . . . 56 4.2.3 Reconstruction Efficiency . . . . . . . . . . . . . . . . . 57 4.3 Branching Fractions and Upper Limit . . . . . . . . . . . . . . 64 4.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Bibliography 67 | |
dc.language.iso | zh-TW | |
dc.title | 量測Bs介子至K+K-介子之稀有二體衰變 | zh_TW |
dc.title | Study of the Bs to hh decays | en |
dc.type | Thesis | |
dc.date.schoolyear | 98-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 張寶棣,侯維恕,熊怡,陳凱風 | |
dc.subject.keyword | Bs介子,二體衰變,正子電子對撞器,K中間子,π介子, | zh_TW |
dc.subject.keyword | Bs meson,two body decay,charmeless,KEKB,Kaon,Pion, | en |
dc.relation.page | 70 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2010-01-14 | |
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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