請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41161
完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 王名儒(Min-Zu Wang) | |
dc.contributor.author | Jui-Te Wei | en |
dc.contributor.author | 魏瑞德 | zh_TW |
dc.date.accessioned | 2021-06-14T17:20:50Z | - |
dc.date.available | 2008-09-02 | |
dc.date.copyright | 2008-09-02 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-07-24 | |
dc.identifier.citation | [1] The particle Adventure
http://particleadventure.org [2] W.-M. Yao et al., et al. (Particle Data Group), J. Phys. G 33, 1 (2006). [3] KEK http://www.kek.jp/intra-e/index.html [4] The BaBar Homepage http://www.slac.stanford.edu [5] K. Abe et al. (Belle Collaboration), Phys. Rev. Lett. 88, 181803 (2002). [6] Throughout the thesis, inclusion of charge conjugate mode is always implied unless otherwise stated. [7] M.Z. Wang et al. (Belle Collaboration), Phys. Rev. Lett. 90, 201802 (2003). [8] M.Z. Wang et al. (Belle Collaboration), Phys. Rev. Lett. 92, 131801 (2004). [9] Y.J. Lee et al. (Belle Collaboration), Phys. Rev. Lett. 93, 211801 (2004). [10] Y.J. Lee et al. (Belle Collaboration), Phys. Rev. Lett. 95, 061802 (2005). [11] W.S. Hou and A. Soni, Phys. Rev. Lett. 86, 4247 (2001). [12] C.K. Chua, W.S. Hou and S.Y. Tsai, Phys. Lett. B 544, 139 (2002); J.L. Rosner, Phys. Rev. D 68, 014004 (2003); B. Kerbikov, A. Stavinsky, and V. Fedotov, Phys. Rev. C 69, 055205 (2004); J. Haidenbauer, U.G. Meissner and A. Sibirtsev, Phys. Rev. D 74, 017501 (2006); D.R. Entem and F. Fernandez, Phys. Rev. D 75, 014004 (2007). [13] M.Z. Wang et al. (Belle Collaboration), Phys. Lett. B 617, 141 (2005); B. Aubert et al. (BABAR Collaboration) Phys. Rev. D 72, 051101 (2005). [14] H.Y. Cheng, Int. J. Mod. Phys. A 21, 4209 (2006). [15] C.Q. Geng and Y.K. Hsiao, Phys. Rev. D 74, 094023 (2006). [16] W.S. Hou, M. Nagashima and A. Soddu, hep-ph/0605080. [17] M. Hazumi, Phys. Lett. B 583, 285 (2004). [18] N. Gabyshev et al. (Belle Collaboration), Phys. Rev. Lett. 90, 141802 (2003); N. Gabyshev et al. (Belle Collaboration), Phys. Rev. Lett. 97, 242001 (2006); R. Chistov et al. (Belle Collaboration), Phys. Rev. D 74, 111105(R) (2006). [19] V.L. Chernyak and I.R. Zhitnitsky, Nucl. Phys. B 345, 137 (1990). [20] M. Jarfi et al., Phys. Rev. D 43, 1599 (1991); H.Y. Cheng and K.C. Yang, Phys. Rev. D 66, 014020 (2002). [21] C.K. Chua, Phys. Rev. D 68, 074001 (2003). [22] M. Suzuki, J. Phys. G. 29, B15 (2003). [23] A. Ali, G. F. Giudice and T. Mannel, Z. Phys. C 67, 417 (1995); A. Ali, P. Ball, L. T. Handoko and G. Hiller, Phys. Rev. D 61, 074024 (2000). [24] K. Abe et al. (Belle Collaboration), Phys. Rev. Lett. 88, 021801 (2001); A. Ishikawa et al. (Belle Collaboration), Phys. Rev. Lett. 91, 261601 (2003); M. Iwasaki et al. (Belle Collaboration), Phys. Rev. D 72, 092005 (2005); A. Ishikawa et al. (Belle Collaboration), Phys. Rev. Lett. 96, 251801 (2006); B. Aubert et al. (BaBar Collaboration), Phys. Rev. D 73, 092001 (2006); B. Aubert et al. (BaBar Collaboration), Phys. Rev. Lett. 93, 081802 (2004). [25] S. Davidson, D. C. Bailey and B. A. Campbell, Z. Phys. C 61, 613 (1994); G. Burdman, Phys. Rev. D 52, 6400 (1995); J. L. Hewett and J. D. Wells, Phys. Rev. D 55, 5549 (1997); A. Ali, E. Lunghi, C. Greub and G. Hiller, Phys. Rev. D 66, 034002 (2002); T. M. Aliev, A. Ozpineci and M. Savci, Eur. Phys. J. C 29, 265 (2003) and references therein. [26] T. M. Aliev and M. Savci, Phys. Rev. D 60, 014005 (1999); [27] A. Abashian et al. (Belle Collaboration), Nucl. Instr. and Meth. A 479, 117 (2002). [28] BELLE HOME PAGE http://belle.kek.jp [29] L. Hinz et al. Belle Note (internal note) 954 (2006). [30] K. Hanagaki et al. Nucl. Instr. and Meth. A 485, 490-503 (2002). [31] A. Abashian et al. Nucl. Instr. and Meth. A 491, 69-82 (2002). [32] BASF user’s manual http://belle.kek.jp/group/software/basf/html/basf.html [33] The EvtGen package home page http://www.slac.stanford.edu/ lange/EvtGen [34] LEPP - CLEO http://www.lepp.cornell.edu/Research/EPP/CLEO [35] The BaBar Homepage http://www.slac.stanford.edu/BFROOT [36] R. Brun et al., GEANT 3.21, CERN Report No. DD/EE/84-1, 1987. [37] Physics Analysis Workstation http://paw.web.cern.ch/paw/ [38] Mn Fit http://www-zeus.physik.uni-bonn.de/ brock/mn fit.html [39] Minuit http://seal.web.cern.ch/seal/snapshot/work- packages/mathlibs/minuit/index.html [40] CERN - European Organization for Nuclear Research http://public.web.cern.ch/Public/Welcome.html [41] E. Nakano, Nucl. Instr. and Meth. A 494, 402-408 (2002). [42] K. Hanagaki et al., Nucl. Instrum. Methods Phys. Res., Sect. A 485, 490 (2002); A. Abashian et al., Nucl. Instrum. Methods Phys. Res., Sect. A 491, 69 (2002). [43] K.-F. Chen et al. Belle Note (internal note)684 (2004). [44] G. C. Fox and S. Wolfram, Phys. Rev. Lett. 41, 1581 (1978). The modified moments used in this paper are also described in, S. H. Lee et al. (Belle Collaboration), Phys. Rev. Lett. 91, 261801 (2003). [45] R.A. Fisher, Annals of Eugenics 7, 179 (1936). [46] M.-Z. Wang, Y.-J. Lee, et al. (Belle Collaboration), Phys. Rev. D 76, 052004 (2007). [47] H. Kakuno et al., Nucl. Instrum. Methods Phys. Res., Sect. A 533, 516 (2004). [48] H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B 241, 278 (1990); ibid. B 254, 288 (1991). [49] A. Ali, E. Lunghi, C. Greub and G. Hiller, Phys. Rev. D 66, 034002 (2002); [50] Z. Natkaniec et al. (Belle SVD2 Group), Nucl. Instr. and Meth. A 560, 1 (2006). [51] G.J. Feldman and R.D. Cousins, Phys. Rev. D 57, 3873 (1998). [52] J. Conrad et al., Phys. Rev. D 67, 012002 (2003). [53] C.K. Chua, W.S. Hou, and S.Y. Tsai, Phys. Rev. D 66, 054004 (2002). [54] M. Suzuki, J. Phys. G 34, 283 (2007). [55] Y.-T. Tsai et al. (Belle Collaboration), Phys. Rev. D. 75, 111101 (2007). [56] C.K. Chua and W.S. Hou, Eur. Phys. J. C 29, 27 (2003). [57] B. Aubert et al. (BaBar Collaboration), Phys. Rev. Lett. 99, 051801 (2007). [58] A. G. Akeroyd et al. (The SuperKEKB Physics Working Group), arXiv:hep-ex/0406071. [59] LHCb - Large Hadron Collider beauty experiment http://lhcb-public.web.cern.ch/lhcb-public/ | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41161 | - |
dc.description.abstract | B+->p‾pK+ and B+->p‾pπ+
We study the characteristics of the low mass p‾p enhancement near threshold in the baryonic B decays: B+->p‾pK+ and B+->p‾pπ+. We observe that the proton polar angle distributions in the p‾p helicity frame in the two decays have the opposite polarity, and measure the forward-backward asymmetries as a function of the p‾p mass for the p‾pK+ mode. We also search for the intermediate two-body decays, B+->‾p ++ and B+->p‾ 0, and set upper limits on their branching fractions: B(B+->‾p ++) < 0.14 × 10^-6 and B(B+->p‾ 0) < 1.38×10^-6. These results are obtained from a data sample of 449 million BB pairs collected near the Upsilon(4S) resonance with the Belle detector at KEKB. B+->p‾Λγ, p‾Λπ0 and B0->p‾Λπ− To further understand the mechanism in the low p‾p mass for baryonic B decays. We review the study of B+->p‾Λγ, p‾Λπ0 and B0->p‾Λπ− done by Y.-J. Lee (NTUHEP group) in 2006. The branching fractions and angular distributions of the three decays are remeasured with the same data sample, and the results are consistent with Lee’s study. In adition, we also measure the anisotropy parameter ‾α of the secondary proton from decays. The results are ‾α(B+->p‾Λγ) = −0.57 ± 0.33(stat) ± 0.10(syst), ‾α(B+->p‾Λπ0) = −0.27 ± 0.33(stat) ± 0.10(syst), and ‾α(B+->p‾Λπ−) = −0.28 ± 0.21(stat) ± 0.10(syst). B->πℓ+ℓ− We also present a search for the B+->π+ℓ+ℓ− and B0->π0ℓ+ℓ− decays, with a data sample of 657 million BB pairs. By performing maximum likelihood fits to the reconstructed candidates, no significant signal is observed and we set the upper limit on the isospin-averaged branching fraction B(B->πℓ+ℓ−) < 6.2 × 10^-8 at the 90% confidence level. | en |
dc.description.provenance | Made available in DSpace on 2021-06-14T17:20:50Z (GMT). No. of bitstreams: 1 ntu-97-R94222073-1.pdf: 1321531 bytes, checksum: 9be004ffa35cc7b221013c725d3521d4 (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 1 Introduction 1
1.1 Particle Physics . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 The Standard Model . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 CKM matrix . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.2 CP violation . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3.1 B meson . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3.2 Baryonic B decays . . . . . . . . . . . . . . . . . . . . 5 1.3.3 Leptonic B decays . . . . . . . . . . . . . . . . . . . . 6 2 KEK B-Factory 9 2.1 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Belle Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.1 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2.2 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . 13 2.2.3 Extreme Forward Calorimeter (EFC) . . . . . . . . . . 14 2.2.4 Central Drift Chamber (CDC) . . . . . . . . . . . . . . 16 2.2.5 Aerogel Cherenkov counter system (ACC) . . . . . . . 18 2.2.6 Time-of-Flight Counters (TOF) . . . . . . . . . . . . . 19 2.2.7 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . 22 2.2.8 KL and Muon Detector (KLM) . . . . . . . . . . . . . 24 3 Analysis Method 27 3.1 Analysis Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.1 BASF . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.2 EvtGen and GSIM . . . . . . . . . . . . . . . . . . . . 27 3.1.3 PAW, Mn Fit and MINUIT . . . . . . . . . . . . . . . 29 3.2 B Meson Reconstruction . . . . . . . . . . . . . . . . . . . . . 30 3.3 Background Suppression . . . . . . . . . . . . . . . . . . . . . 32 3.3.1 Event shape variables . . . . . . . . . . . . . . . . . . . 33 3.3.2 Fisher discriminant . . . . . . . . . . . . . . . . . . . . 35 3.3.3 KSFW and BB suppression . . . . . . . . . . . . . . . 36 3.3.4 Peaking background veto . . . . . . . . . . . . . . . . . 39 3.4 Figure of Merit . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.5 Extraction of Signals . . . . . . . . . . . . . . . . . . . . . . . 43 3.6 Systematic Study . . . . . . . . . . . . . . . . . . . . . . . . . 47 4 Physics Results 51 4.1 p‾pK+ and p‾pπ+ Study . . . . . . . . . . . . . . . . . . . . . . 51 4.1.1 BF Measurement and Mp‾p Distribution . . . . . . . . . 53 4.1.2 Angular Distribution . . . . . . . . . . . . . . . . . . . 53 4.1.3 Search for Two-body B Decays . . . . . . . . . . . . . 57 4.1.4 CP Violation . . . . . . . . . . . . . . . . . . . . . . . 58 4.2 B->p‾Λγ, p‾Λπ0 and p‾Λπ− Checks . . . . . . . . . . . . . . . . . . . 59 4.2.1 Anisotropy parameter ‾α . . . . . . . . . . . . . . . . . 59 4.3 Search for B->πℓ+ℓ− . . . . . . . . . . . . . . . . . . . . . . 63 4.4 Discussion and Conclusion . . . . . . . . . . . . . . . . . . . . 65 4.4.1 Baryonic B decays . . . . . . . . . . . . . . . . . . . . 65 4.4.2 Search for B->πℓ+ℓ− decay . . . . . . . . . . . . . . . 67 A Published Papers 75 | |
dc.language.iso | en | |
dc.title | B介子衰變至p pbar K/π之研析與尋找B->πll衰變 | zh_TW |
dc.title | Study of the B decays B->ppK/πand Search for B->πll decay | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 張寶棣(Paoti Chang),侯維恕(Wei-Shu Hou),熊怡(Yee Hsiung) | |
dc.subject.keyword | B介子,高能實驗, | zh_TW |
dc.subject.keyword | B meson,hep,high energy physics, | en |
dc.relation.page | 75 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2008-07-26 | |
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 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-97-1.pdf 目前未授權公開取用 | 1.29 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。