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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒(Min-Zu Wang) | |
| dc.contributor.author | Kuan-Po Lin | en |
| dc.contributor.author | 林冠伯 | zh_TW |
| dc.date.accessioned | 2021-05-13T06:42:40Z | - |
| dc.date.available | 2017-02-17 | |
| dc.date.available | 2021-05-13T06:42:40Z | - |
| dc.date.copyright | 2017-02-17 | |
| dc.date.issued | 2017 | |
| dc.date.submitted | 2017-02-14 | |
| dc.identifier.citation | [1] http://en.wikipedia.org/wiki/File:Standard Model of Elementary Particles.svg
[2] M.Kobayashi and T.Maskawa,”CP-Violation in the Renormalizable Theory of Weak Interaction”, Progress of Theoretical Physics 49, 2, 652-657 (1973) [3] (Particle Data Group) http://pdg.lbl.gov/ [4] L.Wolfenstein, ”Parametrization of the Kobayashi-Maskawa Matrix”, Phys. Rev. Lett. 51, 1945-1947 (1983) [5] S. W. Herb et al., ”Observation of a Dimuon Resonance at 9.5 GeV in 400-GeV Proton-Nucleus Collisions”, Phys. Rev. Lett. 39, 252-255 (1977) [6] J.Beringer et al. (Particle Data Group), Review of Particle Physics, Phys. Rev. D 86 010001 (2012) [7] S. Kurokawa and E. Kikutani, ”Overview of the KEKB accelerators”, Nucl. Instrum. Methods Phys. Res. Sect. A 499, 1, 1-7 (2003) [8] Y. Ushiroda et al. (Belle Collaboration), Development of the central trigger system for the BELLE detector at the KEK B-factory”, Nucl. Instrum. Methods Phys. Res. Sect. A 438 460-471 (1999) [9] G. Crawford et al., Physics Review D Vol. 45 Num. 3 (1995) [10] http://www2.kek.jp/accl/introKEKB/gaiyo.html [11] A. Abashian et al.(Belle Collaboration), Nuclear Instruments and Methods in Physics Research A 479 117232 (2002) [12] http://robbep.web.cern.ch/robbep/EvtGen/GuideEvtGen.pdf [13] http://hep.fi.infn.it/geant.pdf [14] https://www.ifh.de/CHEP97/paper/244.ps [15] http://osksn2.hep.sci.osaka-u.ac.jp/ taku/doc/paw.pdf [16] https://root.cern.ch/download/doc/Users Guide 5 26.pdf [17] Y.-Y. Chang, M.-Z. Wang et al., Phys. Rev. Lett. 115, 221803 (2015) [18] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software:bpsmear [19] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software:addbg [20] M. Feindt et al., Nucl.Instrum.Meth.A654:432-440 (2011) [21] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software:fullreconstruction:nb [22] K.-F. Chen, T.-L. Kuo, Y.-J. Lee (Belle internal), Belle note 684 (2004) [23] Alexei Sibidanov and Kevin Varvell (Belle internal), Belle note 1206 (2011) [24] Bipul Bhuyan (Belle internal), Belle note 1165 (2010) [25] Wolfgang Dungel (Belle internal) Belle note 1176 (2011) [26] Kai-Jen Tien (Belle internal), Belle note 1279 (2012) | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/2591 | - |
| dc.description.abstract | 本篇論文探討B介子經由B^+→pΛ ̅_1520→pp ̅K^+雙重子途徑之衰變。本實驗以蒙地卡羅法模擬日本高能加速器B介子工廠(KEKB)中Belle偵測器收集來自Υ(4S)共振態衰變的7億7千萬BB ̅介子對。本實驗並應用以神經網路演算法為基礎的NeuroBayes來提升訊噪比，以估計B^+→pΛ ̅_1520→pp ̅K^+分支比在90%信心水準下的上限值為5.46 × 10 −7 。此模擬結果可對Belle偵測器真實數據之分支比量測所幫助。相關主題亦值得於新一代B介子工廠(SuperKEKB)進行後續研究。 | zh_TW |
| dc.description.abstract | B+ → pΛ ̄1520 is one of the simplest two-body baryonic B decay modes. Wereconstruct Λ ̄1520 from ̄p and K+, then search for the signal B+ → pΛ1520(→ ppK ̄+). Simulating the data collected at the Υ(4S) resonance with the Belle detector at KEKB, we use Monte Carlo method to generate 772 million BB ̄ pairs collider events. After background suppression, we extract the signal from the Monte Carlo generated data and estimate the branching fraction:B(B+ → pΛ ̄1520) < 5.46 × 10−7 at the 90% confidence level. This study helps measuring the branching fraction of the real data at Belle detector, and further, data at Belle II detector. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-13T06:42:40Z (GMT). No. of bitstreams: 1 ntu-106-R02222014-1.pdf: 10150368 bytes, checksum: 782e65f0c423c3ea992bfcd9e5971d46 (MD5) Previous issue date: 2017 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Standard Model . . . .. . . . . . . . . . . . . . . 1 1.1.1 Feynman Diagram . . . . . . . . . . . . . . . . . 3 1.1.2 The Cabibbo-Kobayashi-Maskawa(CKM) matrix . . . . 4 1.2 B Meson Physics . . . . . . . . . . . . . . . . . . 5 1.3 Motivation . . . . . . . . .. . . . . . . . . . . . 6 2 Belle Experiment 9 2.1 KEKB accelerator . . . . . . . . . . . . . . . . . 10 2.2 Belle Detector . . . . . . . . . . . . . . . . . . 12 2.2.1 Beam Pipe . . . . . . . . . . . . . . . . . . . .12 2.2.2 Silicon Vertex Detector (SVD) . . . . . . . . . .15 2.2.3 Extreme Forward Calorimeter (EFC) . . . . . . . .15 2.2.4 Central Drift Chamber (CDC) . . . . . . . . . . .17 2.2.5 Aerogel Cherenkov Counter System (ACC) . . . . . 18 2.2.6 Time-of-Flight Counters (TOF) . . . . . . . . . .20 2.2.7 Electromagnetic Calorimeter (ECL) . . . . . . . .20 2.3 Trigger and Data Acquisition . . . . . . . . . . . 22 3 Analysis 25 3.1 Blind Analysis . . . . . . . . . . . . . . . . . . 25 3.2 Analysis Tools . . . . . . . . . . . . . . . . . . 25 3.2.1 BASF . . . . . . . . . . . . . . . . . . . . . . 25 3.2.2 EvtGen and GSIM . . . . . . . . . . . . . . . . .26 3.2.3 ROOT and RooFit . . . . . . . . . . . . . . . . .27 3.3 B meson reconstruction . . . . . . . . . . . . . . 27 3.3.1 Data Sample . . . . . . . . . . . . . . . . . . .27 3.3.2 Tracking . . . . . . . . . . . . . . . . . . . . 27 3.3.3 Particle Identification . . . . . . . . . . . . .28 3.3.4 Selection Summary . . . . . . . . . . . . . . . .28 3.4 Background Suppression . . . . . . . . . . . . . . 30 3.4.1 NeuroBayes (NB) . . . . . . . . . . . . . . . . 30 3.4.2 Continuum Background . . . . . . . . . . . . . . 31 3.4.3 Figure of Merit (F.O.M.) . . . . . . . . . . . . 33 3.4.4 BB ̄ Suppression . . . . . . . . . . . . . . . . .37 3.5 Signal Extraction . . . . . . . . . . . . . . . . .37 3.5.1 Ensemble Test on Fitters . . . . . . . . . . . . 39 3.5.2 Upper Limit Estimation . . . . . . . . . . . . . 39 4 Conclusion 41 Bibliography 43 | |
| dc.language.iso | en | |
| dc.title | 以蒙地卡羅法研討Ｂ介子至質子Λ重子衰變 | zh_TW |
| dc.title | Monte Carlo Study of B+ → p(1520) Decay at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 105-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王正祥,張寶棣,徐靜戈 | |
| dc.subject.keyword | B介子,Belle,KEKB, | zh_TW |
| dc.subject.keyword | B meson,Belle,KEKB,NeuroBayes, | en |
| dc.relation.page | 44 | |
| dc.identifier.doi | 10.6342/NTU201700568 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2017-02-14 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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