Anomalous Gtt Coupling In Single Lepton Tt Events From Pp Collisions At Square Root S

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Anomalous Gtt Coupling In Single Lepton Tt Events From Pp Collisions At Square Root S

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Author : Kwok Ming Chan
language : en
Publisher:
Release Date : 2005

Anomalous Gtt Coupling In Single Lepton Tt Events From Pp Collisions At Square Root S written by Kwok Ming Chan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Search For Anomalous Production Of Events With Three Or More Leptons In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2014

Search For Anomalous Production Of Events With Three Or More Leptons In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

A search for physics beyond the standard model in events with at least three leptons is presented. The data sample, corresponding to an integrated luminosity of 19.5 inverse femtobarns of proton-proton collisions with center-of-mass energy sqrt(s) = 8 TeV, was collected by the CMS experiment at the LHC during 2012. The data are divided into exclusive categories based on the number of leptons and their flavor, the presence or absence of an opposite-sign, same-flavor lepton pair (OSSF), the invariant mass of the OSSF pair, the presence or absence of a tagged bottom-quark jet, the number of identified hadronically decaying tau leptons, and the magnitude of the missing transverse energy and of the scalar sum of jet transverse momenta. The numbers of observed events are found to be consistent with the expected numbers from standard model processes, and limits are placed on new-physics scenarios that yield multilepton final states. In particular, scenarios that predict Higgs boson production in the context of supersymmetric decay chains are examined. We also place a 95% confidence level upper limit of 1.3% on the branching fraction for the decay of a top quark to a charm quark and a Higgs boson (t to c H), which translates to a bound on the left- and right-handed top-charm flavor-violating Higgs Yukawa couplings, lambda[H, tc] and lambda[H, ct], respectively, of sqrt(abs(lambda[H, tc])2̂ + abs(lambda[H, ct])2̂)

Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Root S

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022

Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.

Abstract: A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four charged leptons (3l and 4l, ) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from pp collisions delivered by the Large Hadron Collider at a centre-of-mass energy of TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb−1. The 3l and 4l phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a Z-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section

Cp Violating Anomalous Top Quark Coupling In P Bar P Collision At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2011

Cp Violating Anomalous Top Quark Coupling In P Bar P Collision At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

We conduct the first study of the T-odd correlations in tt events produced in p$\bar{p}$ collision at the Fermilab Tevatron collider that can be used to search for CP violation. We select events which have lepton+jets final states to identify t$\bar{t}$ events and measure counting asymmetries of several physics observables. Based on the result, we search the top quark anomalous couplings at the production vertex at the Tevatron. In addition, Geant4 development, photon identification, the discrimination of a single photon and a photon doublet from ?0 decay are discussed in this thesis.

Evidence For Exclusive U2192 W W U2013 Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2016

Evidence For Exclusive U2192 W W U2013 Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

A search for exclusive or quasi-exclusive ?? → W${̂+}$ W${̂–}$ production, via pp → p${̂(*)}$ W${̂+}$ W${̂–}$ p${̂(*)}$ → p${̂(*)}$ ?${̂±}$e${̂∓}$ p${̂(*)}$ at $ sqrt{s}=8 $ TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb${̂–1}$. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum p$_{T}$(?${̂±}$e${̂∓}$) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb${̂–1}$ of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 ± 0.6 (0.84 ± 0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4? over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive ?? → W${̂+}$ W${̂–}$ production. Here, upper limits on the anomalous quartic gauge coupling operators a$_{0,C}{̂W}$ (dimension-6) and f$_{M0,1,2,3}$ (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.

Measurement Of Tt Production Cross Section In Pp Collisions At Square Root S

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Author : Harpreet Singh
language : en
Publisher:
Release Date : 1999

Measurement Of Tt Production Cross Section In Pp Collisions At Square Root S written by Harpreet Singh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Collisions (Nuclear physics) categories.

Search For Anomalous Couplings In Boosted Mathrm Ww Wz To Ell Nu Mathrm Q Bar Q Production In Proton Proton Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2017

Search For Anomalous Couplings In Boosted Mathrm Ww Wz To Ell Nu Mathrm Q Bar Q Production In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

This Letter presents a search for new physics manifested as anomalous triple gauge boson couplings in WW and WZ diboson production in proton-proton collisions. The search is performed using events containing a W boson that decays leptonically and a W or Z boson whose decay products are merged into a single reconstructed jet. The data, collected at sqrt(s) =8 TeV with the CMS detector at the LHC, correspond to an integrated luminosity of 19 inverse femtobarns. No evidence for anomalous triple gauge couplings is found and the following 95% confidence level limits are set on their values: lambda ([-0.011,0.011]), Delta kappa[gamma] ([-0.044,0.063]), and Delta g[1,Z] ([-0.0087,0.024]). These limits are also translated into their effective field theory equivalents: c[WWW]/ Lambda^2, ([-2.7,2.7] TeV^{-2}), c[B]/ Lambda^2, ([-14,17] TeV^{-2}), and c[W]/ Lambda^2, ([-2.0,5.7] TeV^{-2}).

Measurement Of The Leptonic Asymmetry In Tt Over Events Produced In Pp Over Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2013

Measurement Of The Leptonic Asymmetry In Tt Over Events Produced In Pp Over Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Cp Violating Anomalous Top Quark Coupling In Pp Collision At Square Root Of S

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Author : Sehwook Lee
language : en
Publisher:
Release Date : 2011

Cp Violating Anomalous Top Quark Coupling In Pp Collision At Square Root Of S written by Sehwook Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Search For Anomalous Triple Gauge Couplings In Ww And Wz Production In Lepton Jet Events In Proton Proton Collisions At S

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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2019

Search For Anomalous Triple Gauge Couplings In Ww And Wz Production In Lepton Jet Events In Proton Proton Collisions At S written by Albert M. Sirunyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.