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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣(Pao-Ti Chang) | |
| dc.contributor.author | Chiao-Yu Tao | en |
| dc.contributor.author | 陶巧妤 | zh_TW |
| dc.date.accessioned | 2021-06-16T07:06:06Z | - |
| dc.date.available | 2014-07-15 | |
| dc.date.copyright | 2014-07-15 | |
| dc.date.issued | 2014 | |
| dc.date.submitted | 2014-07-10 | |
| dc.identifier.citation | [1] F Abe et al. Observation of the Bc meson in p‾p collisions at
sqrt(s) = 1.8 tev. Phys. Rev. Lett., 81:2432, 1998. [2] Aaij et al. First observation of decay Bc+ -> Jpsi pi+ pi- pi+. Phys. Rev. Lett., 108(arXiv:1204.0079. LHCB-PAPER-2011-044. CERN-PH-EP-2012-090):251802. 14 p, Apr 2012. [3] Aaij et al. Measurements of B+c production and mass with the Bc+ -> Jpsi pi + decay. Phys. Rev. Lett., 109(arXiv:1209.5634. LHCB-PAPER-2012-028. CERN-PH-EP-2012-275):232001. 14 p, Oct 2012. Comments: 14 pages including author list, 3 figures. [4] Aaij et al. Observation of the decay Bc+ -> Bs0 pi+. Phys. Rev. Lett., 111(arXiv:1308.4544.CERN-PH-EP-2013-136. LHCB-PAPER-2013-044):181801. 16 p, Aug 2013. Comments:Submitted to Phys. Rev. Lett. [5] Chao-Hsi Chang, Chafik Driouichi, Paula Eerola, and Xing-Gang Wu. Bcvegpy: an event generator for hadronic production of the bc meson. Computer Physics Communications, 159(3):192 – 224, 2004. [6] Chao-Hsi Chang, Jian-Xiong Wang, and Xing-Gang Wu. Bcvegpy2.0: An upgraded version of the generator bcvegpy with the addition of hadroproduction of the p-wave states. Computer Physics Communications, 174(3):241 – 251, 2006. [7] Measurement of the Bs lifetime difference. Technical Report CMS-PAS-BPH-11-006, CERN, Geneva, 2012. [8] I.Dunietz I.Dighe and R.Fleischer. Extracting ckm phases and bs−B‾s mixing parameters from angular distributions of non-leptonic b decays. Eur.Phys.J.C, 6, 1999. [9] J. Beringer et al. Review of Particle Physics (RPP). Phys.Rev., D86:010001, 2012. [10] Measurement of the ratio of the production cross-section times branching fraction between the Bc to J/psi pi and the B+ to J/psi K and of branching fractions Bc to J/psi pi pi pi over Bc to J/psi pi in CMS at sqrt(s)=7 TeV. Technical Report CMS-PASBPH-12-011, CERN, Geneva, 2013. [11] CMS Collaboration. Measurement of tracking efficiency. CMS Physics Analysis Summary CMS-PAS-TRK-10-002, 2010. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57829 | - |
| dc.description.abstract | 本論文經由分析在質心能量8 TeV、累計亮度20.65 fb^(-1)之質子—質子對撞事件下，測量B c to Bs pi衰變。經由分析，我們共觀測到81+-19個事件，此衰變相對於B c to J/psi pi 衰變之衰變比例為(1.7+0.5-0.7(stat.)+-0.5(syst.))x10^3。 | zh_TW |
| dc.description.abstract | We report a search of the decay B c to Bs pi with a data sample
of 20.65 fb^(-1) in proton-proton collisions at sqrt(s) = 8 TeV collected by the CMS experiment at the LHC. With 81+- 19 events observed, the ratio of branching fraction, B(B c to Bs pi)/B(B c to J/psi pi) is measured to be (1.7+0.5-0.7(stat.)+-0.5(syst.))x10^3. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T07:06:06Z (GMT). No. of bitstreams: 1 ntu-103-R01222017-1.pdf: 2944309 bytes, checksum: 77c52941fb6543cec31e444416fa3623 (MD5) Previous issue date: 2014 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Leptons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.2 Quarks and Hadrons . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.3 Gauge bosons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.4 Higgs boson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 Bc Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Experiment Apparatus 4 2.1 The Large Hadron Collider . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 The Compact Muon Solenoid Detector . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 Magnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.2 Tracking System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.3 Electromagnetic Calorimeter . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.4 Hadronic Calorimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.5 Muon System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.6 Trigger System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Physical Object Reconstruction 11 3.1 Track Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 Muon Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 Vertex Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 Data and Simulated Samples 13 4.1 Datasets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 MC Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2.1 BCVEGPY generator . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2.2 Signal MC Reweighting on B0 s helicity angles . . . . . . . . . . . . . . 14 5 Event Selection 16 5.1 High Level Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.2 Reconstruction of B0 s candidates . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.3 Primary Vertex Selction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.4 Signal Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.5 Normalization Channel Study . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6 Control Channel Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6 Systematic Uncertainties 24 6.1 Fit model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.2 B0 s mass difference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.3 Bc and Bs lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.4 Tracking efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7 Result 28 A Appendix 29 A.1 MC truth matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 A.2 Bs background suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 A.3 Check on the Optimization of Selection Criteria in Signal Channel . . . . . . 30 References 31 | |
| dc.language.iso | en | |
| dc.subject | 標準模型 | zh_TW |
| dc.subject | 大強子對撞機 | zh_TW |
| dc.subject | 緊湊渺子線圈 | zh_TW |
| dc.subject | Bc介子 | zh_TW |
| dc.subject | B物理 | zh_TW |
| dc.subject | Standard Model | en |
| dc.subject | LHC | en |
| dc.subject | CMS | en |
| dc.subject | Bc meson | en |
| dc.subject | B physics | en |
| dc.title | 在8 TeV質心能量的質子對撞實驗中尋找Bc介子至Bs介子衰變事件 | zh_TW |
| dc.title | Search for B c to Bs pi decay from proton-proton colisions at
sqrt(s) = 8 TeV | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 102-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 陳凱風(Kai-Feng Chen) | |
| dc.contributor.oralexamcommittee | 侯維恕(Wei-Shu Hou),王名儒(Min-Zu Wang) | |
| dc.subject.keyword | 標準模型,大強子對撞機,緊湊渺子線圈,Bc介子,B物理, | zh_TW |
| dc.subject.keyword | Standard Model,LHC,CMS,Bc meson,B physics, | en |
| dc.relation.page | 31 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2014-07-10 | |
| 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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