This thesis uses genetic Tag and probe method to study muon ID efficiency in Compact Muon Solenoid(CMS) Detector. CMS is one of the main detectors in Large Hadron Collider, which is the world’s largest and most powerful particle collider. The main object of the CMS Collaboration is to inverstigate physics underlying elec- troweak symmetry breaking. Moreover, the CMS detector allows experimental par- ticle physicists to perform various experiments which possibly produce new physics signatures beyond the Standard Model (SM). In order to detect and study these sig- natures, it requires the identification and accurate and precise measurement of muon efficiency. To achieve the measurement, a genetic data-driven approach, Tag and Probe method, is used. This method is widely used in CMS community to measure any user defined object efficiency. Typical observable that is used by this method is di-object resonances like Z or J/Psi. In this thesis, Tag and Probe method employs J/Psi resonances to measure muon Soft and Tight ID efficiency, at proton proton collision at √s = 13 GeV .
Thesis
Muon identification efficiency measured with the CMS detector at √s = 13 TEV
University of Iowa
Master of Science (MS), University of Iowa
Summer 2018
DOI: 10.17077/etd.zlvop4he
Abstract
Details
- Title: Subtitle
- Muon identification efficiency measured with the CMS detector at √s = 13 TEV
- Creators
- Runxiong Dong - University of Iowa
- Contributors
- Jane M. Nachtman (Advisor)Yasar Onel (Committee Member)Robert L. Merlino (Committee Member)Kai Yi (Committee Member)
- Resource Type
- Thesis
- Degree Awarded
- Master of Science (MS), University of Iowa
- Degree in
- Physics
- Date degree season
- Summer 2018
- DOI
- 10.17077/etd.zlvop4he
- Publisher
- University of Iowa
- Number of pages
- vii, 39 pages
- Copyright
- Copyright © 2018 Runxiong Dong
- Language
- English
- Description illustrations
- illustrations (some color)
- Description bibliographic
- Includes bibliographical references (pages 38-39).
- Public Abstract (ETD)
CMS is one of two general purpose detectors at the Large Hadron Collider(LHC), the biggest and most powerful collider in the world. A crucial task of the CMS detector is to detect muons produced in the proton-proton collision in the LHC. Many muons coming from background events are also detected by the CMS detector, in order to know how many muons which we are interested in, are detected in the CMS detector, we need to compute different types of muon efficiency in CMS, including reconstruction efficiency, identification efficiency, and trigger efficiency. This thesis measures muon ID efficiency. Muon ID stands for a specific group of selection criteria on muons, and some IDs, like Soft muon and Tight muon ID, are popular and often used by researchers. Thus, this thesis measures Soft and Tight muon ID efficiency for 2016 data and Monte carlo sample in CMS, and computes the scale factor between the data and monte carlo. Those results can be used later for other analyses.
The method used to measure those efficiency is called the tag and probe method, which is a generic data driven method to measure muon efficiency. It uses some known mass resonances like Z or J/Psi as observation. Then, it fits the shape of the known mass resonances to compute the number of events passing or failing. This thesis uses the method measuring the Soft and Tight muon ID efficiency. The measurement is performed as a function of η and pT . The overall efficiency are very high for those two ID.
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9983777259502771
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