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Author : Shikma Bressler
Release : 2011
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Search for Heavy Long-lived Charged Particles with the ATLAS Detector in Pp Collisions at √s by : Shikma Bressler
Download or read book Search for Heavy Long-lived Charged Particles with the ATLAS Detector in Pp Collisions at √s written by Shikma Bressler. This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Release : 2015
Genre :
Kind : eBook
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Book Synopsis Search for Heavy Long-lived Multi-charged Particles in Pp Collisions at [arrow]" by :
Download or read book Search for Heavy Long-lived Multi-charged Particles in Pp Collisions at [arrow]" written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: A search for heavy long-lived multi-charged particles is performed using the ATLAS detector at the LHC. Data collected in 2012 at [arrow]" = 8 TeV from pp collisions corresponding to an integrated luminosity of 20.3 fb-1 are examined. Particles producing anomalously high ionisation, consistent with long-lived massive particles with electric charges from.
Author : Lesya Horyn
Release : 2022-02-07
Genre : Science
Kind : eBook
Book Rating : 723/5 ( reviews)
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).
Author :
Release : 2015
Genre :
Kind : eBook
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Book Synopsis Search for Metastable Heavy Charged Particles with Large Ionisation Energy Loss in Pp Collisions at ${\sqrt{s} by :
Download or read book Search for Metastable Heavy Charged Particles with Large Ionisation Energy Loss in Pp Collisions at ${\sqrt{s} written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously large specific energy loss in the ATLAS pixel detector. Measuring heavy long-lived particles through their track parameters in the vicinity of the interaction vertex provides sensitivity to metastable particles with lifetimes from 0.6 ns to 30 ns. A search for such particles with the ATLAS detector at the Large Hadron Collider is presented, based on a data sample corresponding to an integrated luminosity of \(18.4\) fb\(^{-1}\) of pp collisions at \(\sqrt{s} = 8\) TeV. No significant deviation from the Standard Model background expectation is observed, and lifetime-dependent upper limits on R-hadrons and chargino production are set. Gluino R-hadrons with 10 ns lifetime and masses up to 1185 GeV are excluded at 95 \(\%\) confidence level, and so are charginos with 15 ns lifetime and masses up to 482 GeV.
Author :
Release : 2016
Genre :
Kind : eBook
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Book Synopsis Search for Metastable Heavy Charged Particles with Large Ionization Energy Loss in Pp Collisions at S by :
Download or read book Search for Metastable Heavy Charged Particles with Large Ionization Energy Loss in Pp Collisions at S written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: This study presents a search for massive charged long-lived particles produced in pp collisions at √s = 13TeV at the LHC using the ATLAS experiment. The data set used corresponds to an integrated luminosity of 3.2 fb–1. Many extensions of the Standard Model predict the existence of massive charged long-lived particles, such as R-hadrons. These massive particles are expected to be produced with a velocity significantly below the speed of light, and therefore to have a specific ionization higher than any Standard Model particle of unit charge at high momenta. The Pixel subsystem of the ATLAS detector is used to measure the ionization energy loss of reconstructed charged particles and to search for such highly ionizing particles. The search presented here has much greater sensitivity than a similar search performed using the ATLAS detector in the √s = 8TeV data set, thanks to the increase in expected signal cross section due to the higher center-of-mass energy of collisions, to an upgraded detector with a new silicon layer close to the interaction point, and to analysis improvements. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on R-hadron production cross sections and masses are set. Gluino R-hadrons with lifetimes above 0.4 ns and decaying to qq¯ plus a 100 GeV neutralino are excluded at the 95% confidence level, with lower mass limit ranging between 740 and 1590 GeV. In the case of stable R-hadrons the lower mass limit at the 95% confidence level is 1570 GeV.
