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Search for Supersymmetry in Proton-proton Collisions at 8 TeV in Events with a Single Lepton, Large Jet Multiplicity, and Multiple B Jets

2014
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Release : 2014
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Book Rating : 412/5 ( reviews)

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Book Synopsis Search for Supersymmetry in Proton-proton Collisions at 8 TeV in Events with a Single Lepton, Large Jet Multiplicity, and Multiple B Jets by : Paul B. Geffert

Download or read book Search for Supersymmetry in Proton-proton Collisions at 8 TeV in Events with a Single Lepton, Large Jet Multiplicity, and Multiple B Jets written by Paul B. Geffert. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for supersymmetry in events with a single lepton, large jet multiplicity, multiple b jets, and significant transverse momentum imbalance in 19.3 fb-1 of pp collisions at center of mass energy of 8 TeV recorded in 2012 by the Compact Muon Solenoid experiment at the Large Hadron Collider. This signature targets strongly produced massive gluinos which decay through top squarks. The observed yields in the signal regions, spanning a broad range of event kinematics, agree with the Standard Model background predictions, which are obtained with a heavy reliance on data control samples. The results of this search are interpreted as cross section limits in the context of simplified supersymmetric scenarios in which gluinos are pair produced and cascade decay to a four top quark, two lightest neutralino final state. By comparing these limits with gluino pair production cross sections, gluinos with mass less than 1 TeV are excluded for low lightest neutralino masses, largely independent of top squark mass.

Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like?

2020-09-03 Science
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Release : 2020-09-03
Genre : Science
Kind : eBook
Book Rating : 908/5 ( reviews)

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Book Synopsis Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? by : Roman Pasechnik

Download or read book Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? written by Roman Pasechnik. This book was released on 2020-09-03. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.

Search for Supersymmetry in Events with One Lepton and Multiple Jets in Proton-proton Collisions at Sqrt(s)

2016
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Release : 2016
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Book Synopsis Search for Supersymmetry in Events with One Lepton and Multiple Jets in Proton-proton Collisions at Sqrt(s) by :

Download or read book Search for Supersymmetry in Events with One Lepton and Multiple Jets in Proton-proton Collisions at Sqrt(s) written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry is performed in events with a single electron or muon in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 2.3 inverse femtobarns. Several exclusive search regions are defined based on the number of jets and b-tagged jets, the scalar sum of the jet transverse momenta, and the scalar sum of the missing transverse momentum and the transverse momentum of the lepton. The observed event yields in data are consistent with the expected backgrounds from standard model processes. The results are interpreted using two simplified models of supersymmetric particle spectra, both of which describe gluino pair production. In the first model, each gluino decays via a three-body process to top quarks and a neutralino, which is associated with the observed missing transverse momentum in the event. Gluinos with masses up to 1.6 TeV are excluded for neutralino masses below 600 GeV. In the second model, each gluino decays via a three-body process to two light quarks and a chargino, which subsequently decays to a W boson and a neutralino. The mass of the chargino is taken to be midway between the gluino and neutralino masses. In this model, gluinos with masses below 1.4 TeV are excluded for neutralino masses below 700 GeV.

Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector

2013
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Release : 2013
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Book Rating : 842/5 ( reviews)

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Book Synopsis Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector by : Wing Howard To

Download or read book Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector written by Wing Howard To. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for supersymmetry (SUSY) at the Large Hadron Collider using data collected in Run 2011 at center of mass energy of 7 TeV by the Compact Muon Solenoid detector with an integrated luminosity of 4.98 $fb{-1}$. First, the Large Hadron Collider is briefly described along with the Compact Muon Solenoid detector. Second, the Standard Model of particle physics is described which leads to the motivations for supersymmetry and its description. Finally, a search for supersymmetry in events with a single lepton, 2 b-tagged jets and missing transverse energy is documented in detail. The results are used to predict the yields from the standard model in bins missing transverse energy (\met) and total transverse hadronic energy (HT). Limits are set using these results using a minimal supergravity SUSY model and simplified model spectra SUSY model.

Search for Supersymmetry in 8 TeV Proton-proton Collision Events with Bottom-quark Jets and Missing Transverse Energy

2014
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Release : 2014
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Book Synopsis Search for Supersymmetry in 8 TeV Proton-proton Collision Events with Bottom-quark Jets and Missing Transverse Energy by : Benjamin Kreis

Download or read book Search for Supersymmetry in 8 TeV Proton-proton Collision Events with Bottom-quark Jets and Missing Transverse Energy written by Benjamin Kreis. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry in a sample of proton-proton collision events with a center-of-mass energy of 8 TeV is presented. The sample, collected with the Compact Muon Solenoid detector at the Large Hadron Collider, corresponds to an integrated luminosity of 19.4 fb[-]1 . Events are required to have large missing transverse energy, at least three jets, and at least one identified bottom-quark jet. Numbers of events in exclusive bins of the scalar sum of jet transverse momentum values, missing transverse energy, and bottom-quark jet multiplicity are found to be consistent with the standard model expectations. The results are interpreted as 95% confidence level upper limits on simplified supersymmetric models approximating gluino mediated bottom- and top-squark production.

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