https://scholars.lib.ntu.edu.tw/handle/123456789/31981
DC 欄位 | 值 | 語言 |
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dc.contributor | 張寶棣 | en |
dc.contributor | 臺灣大學:物理研究所 | zh_TW |
dc.contributor.author | 沈昱廷 | zh |
dc.contributor.author | Shen, Yu-Ting | en |
dc.creator | 沈昱廷 | zh |
dc.creator | Shen, Yu-Ting | en |
dc.date | 2006 | en |
dc.date.accessioned | 2007-11-26T09:17:50Z | - |
dc.date.accessioned | 2018-06-28T09:38:36Z | - |
dc.date.available | 2007-11-26T09:17:50Z | - |
dc.date.available | 2018-06-28T09:38:36Z | - |
dc.date.issued | 2006 | - |
dc.identifier | en-US | en |
dc.identifier.uri | http://ntur.lib.ntu.edu.tw//handle/246246/54503 | - |
dc.description.abstract | 在此篇論文中,使用了日本國家高能加速器中心B介子工廠(KEKB)的Belle偵測器,由非對稱能量之正負電子對撞所獲得的 414 fb^{-1}實驗數據。從實驗數據中,藉由濾除背景訊號來分析稀有衰變 B → ΦΦK 之衰變機率與電荷及宇稱不守恆。 我們首度證實了 B^+ → ΦΦK^+ 此一衰變過程確實存在,並且也發現了 B^0 → ΦΦK^0 可能存在的證據。 其衰變分率分別為: ● B(B^+ → ΦΦK^+)= [3.18^{+0.60}_{-0.52}(統計誤差) ± 0.27(系統誤差)] × 10^{-6} ● B(B^0 → ΦΦK^0) = [2.31^{+1.00}_{-0.74}(統計誤差) ± 0.24(系統誤差)] × 10^{-6} 在考慮到統計誤差與系統誤差之後,其訊號的顯著性分別是 9.53 與 4.74 個標準差。 此外,我們也做了相關的含魅衰變模式之分析: ● B(η_c → ΦΦ) = (3.01^{+1.06}_{-1.02} ± 0.19) × 10^{-3} ● B(η_c → ΦK^+K^-) = (4.35^{+1.45}_{-1.44} ± 0.29) × 10^{-3} ● B(η_c → 2(K^+K^-)) = (2.62^{+0.93}_{-0.90} ± 0.18) × 10^{-3} ● B(J/Ψ → ΦK^+K^-) = (1.45^{+0.30}_{-0.27} ± 0.11) × 10^{-3} ● B(J/Ψ → 2(K^+K^-)) = (9.73^{+1.77}_{-1.61} ± 0.84) × 10^{-4} 且被測量到的η_c寬度為 25.17^{+7.72}_{-5.98} ± 0.32 MeV。 | zh_TW |
dc.description.abstract | In this thesis, we present measurements of the branching fraction and CP asymmetry of rare B decay B → ΦΦK. These measurements are based on a 414 fb^{-1} data sample, which contains 447 × 10^6 B Bbar pairs, collected with the Belle detector at the KEKB asymmetric-engry e^+e^- (3.5 on 8 GeV) collider operating at the ?(4S) resonance. We observe the B^+ → ΦΦK^+ decay and report the evidence for B^0 → ΦΦK^0 decay. The branching fractions are measured to be: ● B(B^+ → ΦΦK^+)= [3.18^{+0.60}_{-0.52}(stat) ± 0.27(sys)] × 10^{-6} ● B(B^0 → ΦΦK^0) = [2.31^{+1.00}_{-0.74}(stat) ± 0.24(sys)] × 10^{-6} for a ΦΦ invariant mass below 2.85 GeV/c^2, with significances including systematic uncertainty of 9.53 and 4.74 standard deviations, respectively. In addition, we also study the charmonium decays, related to the ΦΦK. The measured branching ratios are: ● B(η_c → ΦΦ) = (3.01^{+1.06}_{-1.02} ± 0.19) × 10^{-3} ● B(η_c → ΦK^+K^-) = (4.35^{+1.45}_{-1.44} ± 0.29) × 10^{-3} ● B(η_c → 2(K^+K^-)) = (2.62^{+0.93}_{-0.90} ± 0.18) × 10^{-3} ● B(J/Ψ → ΦK^+K^-) = (1.45^{+0.30}_{-0.27} ± 0.11) × 10^{-3} ● B(J/Ψ → 2(K^+K^-)) = (9.73^{+1.77}_{-1.61} ± 0.84) × 10^{-4} The measured width of η_c is 25.17^{+7.72}_{-5.98} ± 0.32 MeV. | en |
dc.description.tableofcontents | 1 Preface 13 2 Introduction of Particle Physics 15 2.1 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2 Symmetries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.3 CP violation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.4 CKM matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.5 B mesons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3 The Belle Experiment 23 3.1 The introduction of Belle Experiment . . . . . . . . . . . . . . . . . . . . 23 3.2 Υ(4S ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.3 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.4 BELLE Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.4.1 Beam pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.4.2 Extreme Forward Calorimeter (EFC) . . . . . . . . . . . . . . . . 30 3.4.3 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . . . . . . . 31 3.4.4 Central Drift Chamber (CDC) . . . . . . . . . . . . . . . . . . . . 33 3.4.5 Aerogel Cherenkov Counter (ACC) . . . . . . . . . . . . . . . . . 33 3.4.6 Time of Flight (TOF) . . . . . . . . . . . . . . . . . . . . . . . . 35 3.4.7 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . . . . . . . 35 3.4.8 KL and Muon detection system (KLM) . . . . . . . . . . . . . . . 36 3.4.9 Solenoid and iron yoke . . . . . . . . . . . . . . . . . . . . . . . . 36 3.5 Data Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4 Analysis Method 39 4.1 Basic Analysis Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.1.1 EvtGen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.1.2 GSIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.1.3 BASF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4.1.4 PAW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4.1.5 MINUIT & Mn fit . . . . . . . . . . . . . . . . . . . . . . . . . . 41 4.2 Analysis Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.2.1 Event selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.2.2 B candidate reconstruction . . . . . . . . . . . . . . . . . . . . . 43 4.2.3 Background suppression . . . . . . . . . . . . . . . . . . . . . . . 43 4.2.4 Control sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 4.2.5 Branching fraction and ACP . . . . . . . . . . . . . . . . . . . . . 52 4.2.6 Systematic error . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 5 The measurements of B → ΦΦK 57 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 5.2 Charmless B → ΦΦK, M(ΦΦ) < 2.85 GeV/c^2 . . . . . . . . . . . . . . . . . 57 5.2.1 Real B → ΦΦK events estimation . . . . . . . . . . . . . . . . . . 57 5.2.2 Systematic error . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 5.2.3 The final results of charmless B → ΦΦK . . . . . . . . . . . . . . 65 6 The measurements of related charmonium decays 67 7 Conclusion 73 A Flavor Tagging 75 | en |
dc.format.extent | 6503305 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language | en-US | en |
dc.language.iso | en_US | - |
dc.subject | B介子 | en |
dc.subject | Φ介子 | en |
dc.subject | 昱廷 | en |
dc.subject | Belle | en |
dc.subject | B → ΦΦK | en |
dc.subject | Φ | en |
dc.subject | Yu-Ting | en |
dc.title | B介子衰變至ΦΦK的分支比與電荷宇稱不對稱性之測量 | en |
dc.title | Measurements of Branching Fractions and CP Asymmetries in B → ΦΦK decays at Belle | en |
dc.type | thesis | en |
dc.identifier.uri.fulltext | http://ntur.lib.ntu.edu.tw/bitstream/246246/54503/1/ntu-95-R92222052-1.pdf | - |
dc.relation.reference | [1.] M. Herrero, "THE STANDARD MODEL", arXiv:hep-ph/9812242. [2.] T. D. Lee, C. N. Yang, "Question of Parity Conservation in Weak Interactions", Phys. Rev. 104, 254–258 (1956). [3.] C. S. Wu, "Experimental Test of Parity Conservation in Beta Decay", Phys. Rev. 105, 1413–1415 (1957). [4.] J.H. Christenson, J. W. Cronin, V. L. Fitch, R. Turley, "EVIDENCE FOR THE 2π DECAY OF THE K_S^0 MESON", Phys. Rev. Lett. 13, 138–140 (1964). [5.] Ashton B. Carter and A. I. Sanda, CP Nonconservation in Cascade Decays of B mesons" , Phys. Rev. Lett. 45, 952–954 (1980). [6.] Makoto Kobayashi and Toshihide Maskawa, "CP-Violation in the Renormalizable Theory of Weak Interaction", Prog. Theor. Phys. Vol. 49 Page 652 (1972). [7.] S. W. Herb, D. C. Hom, L. M. Lederman, J. C. Sens, H. D. Snyder, and J. K. Yoh, "Observation of a Dimuon Resonance at 9.5 GeV in 400-GeV Proton-Nucleus Collisions", Phys. Rev. Lett. 39, 252–255 (1977). [8.] S. Kurokawa, E. Kikutani, "Overview of the KEKB accelerators", Nuclear Instruments and Methods in Physics Research A499 (2003) 1 - 7. [9.] Belle Collaboration, A. Abashian et al., "The Belle detector", Nuclear Instruments and Methods in Physics Research A479 (2002) 117-232. [10.] T. Kawasaki, "The Belle silicon vertex detector", Nuclear Instruments and Methods in Physics Research A494 (2002) 94-101. [11.] T. Hara, N. Hayama and T. Yamanaka, "Belle/SVD2 : Status and Performance", http://www.lns.sci.osaka-u.ac.jp/lab/annual-report/2003/Page-064.pdf [12.] The EvtGen package home page http://www.slac.standford.edu/~lange/EvtGen/ [13.] QQ Documentation Sources http://www.lns.cornell.edu/public/CLEO/soft/QQ/ [14.] PYTHIA (and JETSET) webpage http://www.thep.lu.se/~torbjorn/Pythia.html [15.] Detector Description and Simulation Tool http://wwwasdoc.web.cern.ch/wwwasdoc/geant_html3/geantall.html [16.] BASF user's manual http://belle.kek.jp/group/software/basf/htmlbasf.html [17.] Physics Analysis Workstation - PAW http://wwwasd.web.cern.ch/wwwasd/paw/ [18.] Minuit Home Page http://seal.web.cern.ch/seal/snapshot/work-packages/mathlibs/minuit/index.html [19.] Mn_fit Home Page http://www-zeus.physik.uni-boon.de/~brock/mn_fit.html [20.] H. C. Huang, "Observation of B → ΦΦK", Belle Note 581. [21.] Geoffray C. Fox and Stephen Wolfram, "Observables for the Analysis of Event Shapes in e^+e^- Annihilation and Other Processes", Phys. Rev. Lett.41, 1581 - 1585 (1978). [22.] Number of B events in Hadron B(J) http://belle.kek.jp/secured/nbb/nbb.html [23.] H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B241, 278 (1990) [24.] H. Y. Cheng, K. C. Yang, Phys. Rev. D66, 054015 (2002). [25.] B. Bajc, S. Fajfer, R. J. Oakes T. N. Pham, S. Prelovsek, Phys. Lett. B447, 313 (1999). [26.] Tracking Group Home Page http://belle.kek.jp/~hitoshi/private/track/error/index.html [27.] Homepage of PID Joint Group http://belle/kek.jp/group/pid_joint [28.] M. Hazumi, "Large direct CP violation in B → ΦΦX_S decays", Phys. Lett. B583, 285 (2004). [29.] H. Kakuno, "Flavor tagging by Multidimensional likelihood method", Belle Note 384. [30.] Particle Data Group, 2006 version http://pdg.lbl.gov/2006/listings/contents.listings.html | en |
item.openairetype | thesis | - |
item.openairecristype | http://purl.org/coar/resource_type/c_46ec | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en_US | - |
item.fulltext | with fulltext | - |
item.grantfulltext | open | - |
顯示於: | 物理學系 |
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