請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62132完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 侯維恕(Wei-Shu Hou) | |
| dc.contributor.author | Kai-Yi Kao | en |
| dc.contributor.author | 高凱逸 | zh_TW |
| dc.date.accessioned | 2021-06-16T13:29:30Z | - |
| dc.date.available | 2014-08-06 | |
| dc.date.copyright | 2013-08-06 | |
| dc.date.issued | 2013 | |
| dc.date.submitted | 2013-07-22 | |
| dc.identifier.citation | [1] M. Aliev et al. – HATHOR – HAdronic Top and Heavy quarks crOss section calculatoR. Comput. Phys. Commun., 182:1034–1046, 2011.
[2] Wei-Shu Hou. Source of CP Violation for the Baryon Asymmetry of the Universe. Chin.J.Phys., 47:134, 2009. [3] Christopher T. Hill. Topcolor assisted technicolor. Phys.Lett., B345:483–489, 1995. [4] Bogdan A. Dobrescu and Christopher T. Hill. Electroweak symmetry breaking via top condensation seesaw. Phys.Rev.Lett., 81:2634–2637, 1998. [5] N. Arkani-Hamed, A.G. Cohen, E. Katz, A.E. Nelson, T. Gregoire, et al. The Minimal moose for a little Higgs. JHEP, 0208:021, 2002. [6] Tao Han, Heather E. Logan, and Lian-Tao Wang. Smoking-gun signatures of little Higgs models. JHEP, 0601:099, 2006. [7] Maxim Perelstein, Michael E. Peskin, and Aaron Pierce. Top quarks and electroweak symmetry breaking in little Higgs models. Phys.Rev., D69:075002, 2004. [8] Kaustubh Agashe, Roberto Contino, and Alex Pomarol. The Minimal composite Higgs model. Nucl.Phys., B719:165–187, 2005. [9] Jonathan Bagger, Savas Dimopoulos, and Eduard Masso. HEAVY FAMILIES: MASSES AND MIXINGS. Nucl.Phys., B253:397, 1985. [10] Paul H. Frampton, P.Q. Hung, and Marc Sher. Quarks and leptons beyond the third generation. Phys.Rept., 330:263, 2000. [11] Shrihari Gopalakrishna, Tanumoy Mandal, Subhadip Mitra, and Rakesh Tibrewala. LHC Signatures of a Vector-like b’. Phys.Rev., D84:055001, 2011. [12] Yasuhiro Okada and Luca Panizzi. LHC signatures of vector-like quarks. Adv.High Energy Phys., 2013:364936, 2013. [13] Pankaj Agrawal, Stephen D. Ellis, Wei-Shu Hou. Q!qZ decays at Tevatron and SSC energies. Phys. Rev., B256, 1991. [14] J.A. Aguilar-Saavedra. Identifying top partners at LHC. JHEP, 0911:030, 2009. [15] Stephen P. Martin. Extra vector-like matter and the lightest higgs scalar boson mass in low-energy supersymmetry. Phys. Rev., D81:035004, 2010. [16] T. Aaltonen et al. Search for New Particles Leading to Z + jets Final States in p‾p Collisions at √s = 1.96-TeV. Phys.Rev., D76:072006, 2007. [17] Georges Aad et al. Search for pair production of a new quark that decays to a Z boson and a bottom quark with the ATLAS detector. Phys.Rev.Lett., 109:071801, 2012. [18] CMS Collaboration. Search for a vector-like quark of charge -1/3 and decaying to bZ in pp collisions at √s = 7 TeV. CMS Physics Analysis Summary, CMS-PAS-EXO-11-066, 2012. [19] S. Chatrchyan et al. The CMS experiment at the CERN LHC. JINST, 3:S08004, 2008. [20] CMS Collaboration. The CMS high level trigger. Eur. Phys. J., C46:605, 2006. [21] Fabio Maltoni and Tim Stelzer. MadEvent: Automatic event generation with MadGraph. JHEP, 02:027, 2003. [22] Torbjorn Sjostrand, Stephen Mrenna, and Peter Skands. Pythia 6.4 physics and manual. JHEP, 05:026, 2006. [23] Hung-Liang Lai, Joey Huston, Zhao Li, Pavel Nadolsky, Jon Pumplin, et al. Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions. Phys.Rev., D82:054021, 2010. [24] S. Agostinelli et al. GEANT4: a simulation toolkit. Nucl. Instrum. Meth., A506:250, 2003. [25] CMS Collaboration. Particle-flow event reconstruction in cms and performance for jets, taus, and MET. CMS Physics Analysis Summary, CMS-PAS-PFT-09-001, 2009. [26] CMS Collaboration. Commissioning of the particle-flow event reconstruction with the first LHC collisions recorded in the CMS detector. CMS Physics Analysis Summary, CMS-PAS-PFT-10-001, 2010. [27] CMS Collaboration. Commissioning of the particle-flow reconstruction in minimum-bias and jet events from pp collisions at 7 TeV. CMS Physics Analysis Summary, CMS-PAS-PFT-10-002, 2010. [28] CMS Collaboration. Particle-flow commissioning with muons and electrons from J/Psi and W events at 7 TeV. CMS Physics Analysis Summary, CMS-PAS-PFT-10-003, 2010. [29] CMS Collaboration. Performance of muon identification in pp collisions at √s = 7 TeV. CMS Physics Analysis Summary, CMS-PAS-MUO-10-002, 2010. [30] Matteo Cacciari, Gavin P. Salam, and Gregory Soyez. The anti-kt jet clustering algorithm. JHEP, 04:063, 2008. [31] CMS Collaboration. Performance of b-jet identification in CMS. CMS Physics Analysis Summary, CMS-PAS-BTV-11-001, 2011. [32] CMS Collaboration. Measurement of btagging efficiency using ttbar events. CMS Physics Analysis Summary, CMS-PAS-BTV-11-003, 2011. [33] CMS Collaboration. b-jet identification in the CMS experiment. CMS Physics Analysis Summary, CMS-PAS-BTV-11-004, 2011. [34] CMS Collaboration. Electron reconstruction and identification at √s = 7 TeV. CMS Physics Analysis Summary, CMS-PAS-EGM-10-004, 2010. [35] Matteo Cacciari and Gavin P. Salam. Pileup subtraction using jet areas. Phys.Lett., B659:119–126, 2008. [36] Serguei Chatrchyan et al. Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS. JINST, 6:P11002, 2011. [37] Serguei Chatrchyan et al. Identification of b-quark jets with the CMS experiment. 2012. [38] CMS Collaboration. Measurement of inclusive W and Z cross sections in pp collisions at √s = 7 TeV. Journal of High Energy Physics, (1):1, 2011. [39] CMS Collaboration. Measurement of the tt production cross section and top quark mass in the dilepton channel in pp collisions at √s = 7 TeV. Journal of High Energy Physics, page 49, 2011. [40] John M. Campbell and R. K. Ellis. MCFM for the Tevatron and the LHC. Nucl. Phys. Proc. Suppl., 205-206:10, 2010. [41] John M. Campbell and R. Keith Ellis. An update on vector boson pair production at hadron colliders. Phys. Rev., D60:113006, 1999. [42] CMS Collaboration. Measurement of the Z/gamma*+b-jet cross section in pp collisions at 7 TeV. 2012. [43] T. Gleisberg, Stefan. Hoeche, F. Krauss, M. Schonherr, S. Schumann, et al. Event generation with SHERPA 1.1. JHEP, 02:007, 2009. [44] CMS Collaboration. Absolute calibration of the luminosity measurement at CMS: Winter 2012 update. CMS Physics Analysis Summary, CMS-PAS-SMP-12-008, 2012. [45] Alexander L. Read. Presentation of search results: The CL(s) technique. J.Phys., G28:2693, 2002. [46] CMS Collaboration. Absolute Calibration of Luminosity Measurement at CMS: Summer 2011 Update. CMS Physics Analysis Summary, CMSPAS-EWK-11-001, 2011. [47] N.V. Kranikov S.I Bityukov. New physics discovery potential in future experiments. Modern Physics Letters A, 13:3235–3249, 199. [48] CMS Collaboration. Cms physics technical design report. CERNLHCC-2006-001. [49] CMS Collaboration. Electromagnetic calorimeter commissioning and first results with 7 TeV data. CMS Note-2010/012, 2010. [50] CMS Collaboration. The HIP algorithm for track based alignment and its application to the CMS pixel detector. CMS Note-2006/018, 2006. [51] CMS Collaboration. Muon reconstruction in the cms detector. CMS AN-2008/097, 2008. [52] CMS Collaboration. Electromagnetic calorimeter commissioning and first results with 7 TeV data. CMS-NOTE-2010-012, 2010. [53] Kai-Yi Kao on behalf of CMS Collaboration. Alignment of the cms preshower detector. Nuclear Instruments and Methods in Physics Research Section A, 699:175–177, 2013. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62132 | - |
| dc.description.abstract | 這是個尋找成對產生類向量夸克B’ 的研究。所用的實驗數據是在大強子對撞機(LHC) 運轉時，分別在2011 年以7 TeV 和2012 年以8 TeV 質心能量的質子對撞並由緊湊渺子線圈(CMS) 偵測器取得，累積的數據量達4.9 fb−1 (2011)，19.6 fb−1 (2012)。由底夸克標籤的粒子噴流和從電子對或渺子對重建的Z 波色子所組合的不變質量，其符合標準模型的預測。在2011 年的數據下，假設B’ 衰變為一個底夸克和一個Z 波色子的分支所占比率為100% 時，則有95% 的信心水準下預期質量下限為510 GeV/c2，而觀測所得下限為550 GeV/c2。2012 年更新的預期下限為680 GeV/c2 而觀測所得為700 GeV/c2。 | zh_TW |
| dc.description.abstract | A search is presented for the pair production of a vector-like quark, B’. Data corresponding to integrated luminosity of 4.9 fb−1 p from pp collisions at √s = 7 TeV in 2011 and 19.6 fb−1 at 8 TeV in 2012 collected with the CMS detector at the LHC were used. The invariant mass spectrum of b-tagged jets and Z boson candidates, with the latter identified through e+e− or μ+μ− decays, is examined for an excess of events and found to be consistent with the standard model expectations. The expected 95% confidence level lower limit on the mass of the B’ quark with the assumption a 100% branching ratio fraction into a bottom quark and a Z boson is 510 GeV/c2, while the observed lower limit is 550 GeV/c2 in 2011; For the updates in 2012, the expected limit is 680 GeV/c2 and observed lower limit is 700 GeV/c2. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T13:29:30Z (GMT). No. of bitstreams: 1 ntu-102-F95222039-1.pdf: 5059623 bytes, checksum: 8b33617111602ae049d2ff2b0a561d0e (MD5) Previous issue date: 2013 | en |
| dc.description.tableofcontents | 1 Introduction 1
2 Detector 3 3 Reconstruction and Selection Criteria 5 3.1 Reconstructed B’ Candidates for 7 TeV . . . . . . . . . . . . 5 3.2 Reconstructed B’ Candidates for 8 TeV . . . . . . . . . . . . 6 4 Analysis for 7 TeV data 11 4.1 Event yield for 7 TeV . . . . . . . . . . . . . . . . . . . . . . . 11 4.2 Systematic Uncertainty for 7 TeV . . . . . . . . . . . . . . . . 13 4.3 Mass Limits for 7 TeV . . . . . . . . . . . . . . . . . . . . . . 15 4.4 Summary for 7 TeV . . . . . . . . . . . . . . . . . . . . . . . . 16 5 Analysis for 8 TeV data 17 5.1 Background Estimation for 8 TeV . . . . . . . . . . . . . . . . 17 5.1.1 Method of background estimation . . . . . . . . . . . 18 5.1.2 MC Closure test . . . . . . . . . . . . . . . . . . . . . 20 5.1.3 Extrapolating test for data . . . . . . . . . . . . . . . 20 5.1.4 Estimated background . . . . . . . . . . . . . . . . . . 23 5.2 Systematic Uncertainty for 8 TeV . . . . . . . . . . . . . . . . 24 5.3 Mass Limits for 8 TeV . . . . . . . . . . . . . . . . . . . . . . 27 5.4 Summary for 8 TeV . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Discussion for the analysis in 2011 33 6.1 Detailed Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6.2 The evaluation of the event selection criteria . . . . . . . . . . 37 6.3 The interesting issues . . . . . . . . . . . . . . . . . . . . . . 39 7 Discussion for the analysis in 2012 41 7.1 Detailed Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.2 The evaluation of the event selection criteria . . . . . . . . . . 45 7.3 Event selection efficiency vs. branching ratio of B’ → bZ . . . 47 7.4 Details for using extraplating method in 7 TeV data . . . . . 53 7.5 Monte Carlo modeling issue . . . . . . . . . . . . . . . . . . . 62 7.6 The interesting issues . . . . . . . . . . . . . . . . . . . . . . 65 8 Conclusion 75 9 Service Work 77 9.1 Low voltage system . . . . . . . . . . . . . . . . . . . . . . . . 77 9.2 Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 9.2.1 Resolution of Preshower . . . . . . . . . . . . . . . . . 79 9.2.2 Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . 79 9.2.3 Alignment for straight line prediction . . . . . . . . . 80 9.2.4 Alignment in 2010 . . . . . . . . . . . . . . . . . . . . 80 9.2.5 Alignment in 2011 and 2012 . . . . . . . . . . . . . . . 81 | |
| dc.language.iso | en | |
| dc.subject | 大強子對撞機 | zh_TW |
| dc.subject | 緊湊渺子線圈 | zh_TW |
| dc.subject | 類向量夸克 | zh_TW |
| dc.subject | LHC | en |
| dc.subject | CMS | en |
| dc.subject | Vector-like quark | en |
| dc.title | 在7和8TeV質心能量質子對撞中藉底夸克加Z波色子事件尋找成對產生的類向量夸克 | zh_TW |
| dc.title | Search for the Pair-production of a Vector-like Quark in b + Z Events from pp Collisions at √s = 7 and 8 TeV | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 101-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 李湘楠,張寶棣,何小剛,熊怡,陳凱風 | |
| dc.subject.keyword | 大強子對撞機,緊湊渺子線圈,類向量夸克, | zh_TW |
| dc.subject.keyword | LHC,CMS,Vector-like quark, | en |
| dc.relation.page | 94 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2013-07-22 | |
| 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-102-1.pdf 未授權公開取用 | 4.94 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。