Share

Search for Long-Lived Particles Decaying to Displaced Dimuons at 13 TeV and Study of Neutron-Induced Background Hits in the Muon System of the Compact Muon Solenoid

2019
Download Search for Long-Lived Particles Decaying to Displaced Dimuons at 13 TeV and Study of Neutron-Induced Background Hits in the Muon System of the Compact Muon Solenoid PDF Online Free

Author :
Release : 2019
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Search for Long-Lived Particles Decaying to Displaced Dimuons at 13 TeV and Study of Neutron-Induced Background Hits in the Muon System of the Compact Muon Solenoid by : Abhigyan Dasgupta

Download or read book Search for Long-Lived Particles Decaying to Displaced Dimuons at 13 TeV and Study of Neutron-Induced Background Hits in the Muon System of the Compact Muon Solenoid written by Abhigyan Dasgupta. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for new long-lived particles decaying to two muons in the CMS detector with pp collision data taken at sqrt(s) = 13 TeV corresponding to 36.3 fb-1 of integrated luminosity during Run 2 of the LHC. Such decays would appear as dimuon vertices displaced with respect to the pp interaction point. The search presented in this thesis uses only the muon system in order to probe the longest lifetimes to which the LHC experiments are sensitive. The results are interpreted in terms of a benchmark model consisting of exotic Higgs bosons decaying to long-lived scalar bosons, but are presented in an approximately model-independent way suitable for reinterpretation. No excess is observed. The appendix describes a study of neutron-induced background in CMS endcap muon chambers.

Search for the Decays of Stopped Exotic Long-lived Particles Produced in P-P Collisions at 13 TeV at CMS

2018 Large Hadron Collider (France and Switzerland)
Download Search for the Decays of Stopped Exotic Long-lived Particles Produced in P-P Collisions at 13 TeV at CMS PDF Online Free

Author :
Release : 2018
Genre : Large Hadron Collider (France and Switzerland)
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Search for the Decays of Stopped Exotic Long-lived Particles Produced in P-P Collisions at 13 TeV at CMS by : Weifeng Ji

Download or read book Search for the Decays of Stopped Exotic Long-lived Particles Produced in P-P Collisions at 13 TeV at CMS written by Weifeng Ji. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: 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.

A Search for Displaced Leptons in the ATLAS Detector

2022-02-07 Science
Download A Search for Displaced Leptons in the ATLAS Detector PDF Online Free

Author :
Release : 2022-02-07
Genre : Science
Kind : eBook
Book Rating : 723/5 ( reviews)

GET EBOOK


Book Synopsis A Search for Displaced Leptons in the ATLAS Detector by : Lesya Horyn

Download or read book A Search for Displaced Leptons in the ATLAS Detector written by Lesya Horyn. This book was released on 2022-02-07. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).

Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s}

2015
Download Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} PDF Online Free

Author :
Release : 2015
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} by :

Download or read book Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton-proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb-1 of 8 TeV proton-proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2+3.6 -2.5 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≤1000 GeV and a top squark with mass ≤525 GeV are excluded, for lifetimes between 1 μs and 1000 s. Finally, these results are the most stringent constraints on stopped particles to date.

Search for the Decay of the Tau Lepton to Three Muons in Data from the Compact Muon Solenoid Experiment at the Large Hadron Collider

2015
Download Search for the Decay of the Tau Lepton to Three Muons in Data from the Compact Muon Solenoid Experiment at the Large Hadron Collider PDF Online Free

Author :
Release : 2015
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Search for the Decay of the Tau Lepton to Three Muons in Data from the Compact Muon Solenoid Experiment at the Large Hadron Collider by : Elijah Kolmes

Download or read book Search for the Decay of the Tau Lepton to Three Muons in Data from the Compact Muon Solenoid Experiment at the Large Hadron Collider written by Elijah Kolmes. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt:

You may also like...