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Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display

2016
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Release : 2016
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Book Synopsis Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display by :

Download or read book Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented of a search for heavy stable charged particles produced in proton-proton collisions at √s = 13 TeV using a data sample corresponding to an integrated luminosity of 2.5 fb-1 collected in 2015 with the CMS detector at the CERN LHC. The search is conducted using signatures of anomalously high energy deposits in the silicon tracker and long time-of-flight measurements by the muon system. The data are consistent with the expected background, and upper limits are set on the cross sections for production of long-lived gluinos, top squarks, tau sleptons, and lepton-like long-lived fermions. These upper limits are equivalently expressed as lower limits on the masses of new states; the limits for gluinos, ranging up to 1610 GeV, are the most stringent to date. Furthermore, limits on the cross sections for direct pair production of long-lived tau sleptons are also determined.

Search for Massive, Long-lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs in [math Display

2015
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Release : 2015
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Book Synopsis Search for Massive, Long-lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs in [math Display by :

Download or read book Search for Massive, Long-lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs in [math Display written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Many extensions of the Standard Model posit the existence of heavy particles with long lifetimes. This article presents the results of a search for events containing at least one long-lived particle that decays at a significant distance from its production point into two leptons or into five or more charged particles. In this study, this analysis uses a data sample of proton-proton collisions at \(\sqrt{s} = 8\) TeV corresponding to an integrated luminosity of 20.3 fb−1 collected in 2012 by the ATLAS detector operating at the Large Hadron Collider. No events are observed in any of the signal regions, and limits are set on model parameters within supersymmetric scenarios involving R-parity violation, split supersymmetry, and gauge mediation. In some of the search channels, the trigger and search strategy are based only on the decay products of individual long-lived particles, irrespective of the rest of the event. In these cases, the provided limits can easily be reinterpreted in different scenarios.

Search for Long-lived Particles Using Delayed Photons in Proton-proton Collisions at 13 TeV with the CMS Detector

2019
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Release : 2019
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Book Synopsis Search for Long-lived Particles Using Delayed Photons in Proton-proton Collisions at 13 TeV with the CMS Detector by : Kevin Patrick McDermott

Download or read book Search for Long-lived Particles Using Delayed Photons in Proton-proton Collisions at 13 TeV with the CMS Detector written by Kevin Patrick McDermott. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a search for long-lived particles using delayed photons in proton-proton collisions at sqrt(s) = 13 TeV recorded by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider in 2017, corresponding to an integrated luminosity of 41.5 fb^-1. This analysis includes a number of unique components that will be discussed: a dedicated signal trigger, out-of-time photon reconstruction and identification, and a detector time resolution measurement. The results of this search include the combination of a related analysis using data collected in 2016 also at sqrt(s) = 13 TeV, corresponding to a combined integrated luminosity of 77.4 fb^-1. The combined results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 10^1, 10^2, 10^3, and 10^4 cm, masses up to 320, 525, 360, and 215 GeV are excluded at 95% confidence level, respectively. Additionally, a discussion on a high-performance computing upgrade to CMS, known as mkFit, will be presented. mkFit is an on-going effort to exploit highly parallel computer architectures in vectorizing and parallelizing combinatorial Kalman filter charged particle track reconstruction algorithms. The current physics and computational performance of this project will be discussed.

Search for Heavy Long-lived Charged Particles with the ATLAS Detector in Pp Collisions at √s

2011
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Release : 2011
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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:

Search for Heavy Long-lived Multi-charged Particles in Pp Collisions at [arrow]"

2015
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Release : 2015
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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.

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