Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


thesis_Weifeng.pdf (5.23 MB)

ETD Abstract Container

Abstract Header

Search for the decays of stopped exotic long-lived particles produced in P-P collisions at 13 TeV at CMS

Ji, Weifeng
http://rave.ohiolink.edu/etdc/view?acc_num=osu1524216345344165

Abstract Details

2018, Doctor of Philosophy, Ohio State University, Physics.
In this dissertation, I present the searches looking for decays of stopped massive long-lived exotic particles, which are pair produced in the proton-proton collisions at 13 TeV and come to rest afterwards in the CMS detector at the CERN LHC. The decays are most likely to be observed when there are no collisions. Two specific decay scenarios are studied: a long-lived particle (LLP) decaying hadronically or semi- leptonically in the calorimeter, and a LLP decaying semi-leptonically or leptonically to a pair of muons in the muon detector. The calorimeter-based search is performed using 2.7 fb-1 of 13 TeV collision run data collected in 2015 and 35.9 fb-1 of 13 TeV collision run data collected in 2016, corresponding to a total trigger livetime of 721 hours. The muon search is performed using 2.8 fb-1 of 13 TeV collision run data collected in 2015 and 36.2 fb-1 of 13 TeV collision run data collected in 2016, corresponding to a total trigger livetime of 744 hours. Search results are interpreted in a couple of simplified models. The limits on the production cross sections and masses of LLPs are calculated as a function of particle lifetimes, which vary from 100 ns to 10 days, assuming the corresponding decaying branching fractions to be 100%. The results are the most stringent ones on the stopped LLPs so far.
Chris Hill, Prof. (Advisor)
Stan Durkin, Prof (Committee Member)
Stuart Raby, Prof. (Committee Member)
Douglass Schumacher, Prof. (Committee Member)
112 p.
Physics
Large Hadron Collider; stopped particles; long-lived particles; Compact Muon Solenoid

Recommended Citations

Citations

  • Ji, W. (2018). Search for the decays of stopped exotic long-lived particles produced in P-P collisions at 13 TeV at CMS [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524216345344165

    APA Style (7th edition)

  • Ji, Weifeng. Search for the decays of stopped exotic long-lived particles produced in P-P collisions at 13 TeV at CMS. 2018. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1524216345344165.

    MLA Style (8th edition)

  • Ji, Weifeng. "Search for the decays of stopped exotic long-lived particles produced in P-P collisions at 13 TeV at CMS." Doctoral dissertation, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524216345344165

    Chicago Manual of Style (17th edition)

osu1524216345344165
245
© 2018, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.