Search For Vector Like Quark Production In The Lepton Jets And Dilepton Jets Final States Using 5 4 Fb 1 Of Run Ii Data
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From The Fermi Scale To Cosmology
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Author : Alberto Salvio
language : en
Publisher: Frontiers Media SA
Release Date : 2019-12-06
From The Fermi Scale To Cosmology written by Alberto Salvio and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-06 with categories.
Cern Courier
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Author :
language : en
Publisher:
Release Date : 2016
Cern Courier 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 Nuclear energy categories.
Search For Vector Like Quark Production In The Lepton Jets And Dilepton Jets Final States Using 5 4 Fb 1 Of Run Ii Data
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Author : Seth Caughron
language : en
Publisher:
Release Date : 2011
Search For Vector Like Quark Production In The Lepton Jets And Dilepton Jets Final States Using 5 4 Fb 1 Of Run Ii Data written by Seth Caughron 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 Vector Like Quark Production In The Lepton Jets And Dilepton Jets Final States Using 5 4 Fb 1 Of Run Ii Data
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Author :
language : en
Publisher:
Release Date : 2010
Search For Vector Like Quark Production In The Lepton Jets And Dilepton Jets Final States Using 5 4 Fb 1 Of Run Ii Data written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The Standard Model of particle physics provides an excellent description of particle interactions at energies up to (almost equal to)1 TeV, but it is expected to fail above that scale. Multiple models developed to describe phenomena above the TeV scale predict the existence of very massive, vector-like quarks. A search for single electroweak production of such particles in p{anti p} collisions at a center-of-mass energy of 1.96 TeV is performed in the W+jets and Z+jets channels. The data were collected by the D0 detector at the Fermilab Tevatron Collider and correspond to an integrated luminosity of 5.4 fb−1. Events consistent with a heavy object decaying to a vector boson and a jet are selected. We observe no significant excess in comparison to the background prediction and set 95% confidence level upper limits on production cross sections for vector-like quarks decaying to W+jet and Z+jet. Assuming a vector-like quark -- standard model quark coupling parameter {tilde {kappa}}{sub qQ} of unity, we exclude vector-like quarks with mass below 693 GeV for decays to W+jet and mass below 449 GeV for decays to Z+jet. These represent the most sensitive limits to date.
Search For Vectorlike B Quarks In Events With One Isolated Lepton Missing Transverse Momentum And Jets At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Vectorlike B Quarks In Events With One Isolated Lepton Missing Transverse Momentum And Jets At U221a 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 2015 with categories.
A search has been performed for pair production of heavy vectorlike down-type (B) quarks. The analysis explores the lepton-plus-jets final state, characterized by events with one isolated charged lepton (electron or muon), significant missing transverse momentum, and multiple jets. One or more jets are required to be tagged as arising from b quarks, and at least one pair of jets must be tagged as arising from the hadronic decay of an electroweak boson. The analysis uses the full data sample of pp collisions recorded in 2012 by the ATLAS detector at the LHC, operating at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. No significant excess of events is observed above the expected background. Limits are set on vectorlike B production, as a function of the B branching ratios, assuming the allowable decay modes are B → Wt/Zb/Hb. In the chiral limit with a branching ratio of 100% for the decay B → Wt, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 810 GeV (760 GeV). In the case where the vectorlike B quark has branching ratio values corresponding to those of an SU(2) singlet state, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 640 GeV (505 GeV). The same analysis, when used to investigate pair production of a colored, charge 5/3 exotic fermion T5/3, with subsequent decay T5/3 → Wt, sets an observed (expected) 95% C.L. lower limit on the T5/3 mass of 840 GeV (780 GeV).
Search For Zw Zz Going To Lepton Lepton Jets Production In Proton Proton Collisions At Cdf
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Author : Wesley Ketchum
language : en
Publisher:
Release Date : 2012
Search For Zw Zz Going To Lepton Lepton Jets Production In Proton Proton Collisions At Cdf written by Wesley Ketchum and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The Standard Model of particle physics describes weak interactions mediated by massive gauge bosons that interact with each other in well-defined ways. Observations of the production and decay of WW, WZ, and ZZ boson pairs are an opportunity to check that these self-interactions agree with the Standard Model predictions. Furthermore, final states that include quarks are very similar to the most prominent final state of Higgs bosons produced in association with a W or Z boson. Diboson production where WW is a significant component has been observed at the Tevatron collider in semi-hadronic decay modes. We present a search for ZW and ZZ production in a final state containing two charged leptons and two jets using 8.9 fb−1 of data recorded with the CDF detector at the Tevatron. We select events by identifying those that contain two charged leptons, two hadronic jets, and low transverse missing energy ( E /T ). We increase our acceptance by using a wide suite of high- pT lepton triggers and by relaxing many lepton identification requirements. We develop a new method for calculating corrections to jet energies based on whether the originating parton was a quark or gluon to improve the agreement between data and the Monte Carlo simulations used to model our diboson signal and dominant backgrounds. We also make use of neural-network-based discriminants that are trained to pick out jets originating from b quarks and light-flavor quarks, thereby increasing our sensitivity to Z → bb ̄ and W/Z → qq ̄' decays, respectively. The number of signal events is extracted through a simultaneous fit to the dijet mass spectrum in three channels: a heavy-flavor tagged channel, a light-flavor tagged channel, and an untagged channel. We measure σZW/ZZ = 2.5+2.0-1.0 pb, which is consistent with the SM cross section of 5.1 pb. We establish an upper limit on the cross section of σZW/ZZ
Search For Admixture Of Scalar Top Quarks In The T Anti T Lepton Jets Final State At S
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Author :
language : en
Publisher:
Release Date : 2009
Search For Admixture Of Scalar Top Quarks In The T Anti T Lepton Jets Final State At 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 2009 with categories.
A search for pair production of the lightest supersymmetric partner of the top quark, {tilde t}1, is performed in the lepton+jets channel using 0.9 fb−1 of data collected by the D0 experiment. Kinematic differences between {tilde t}1{bar {tilde t}}1 and the dominant top quark pair production background are used to separate the two processes. First limits from Run II of the Fermilab Tevatron Collider for the scalar top quark decaying to a chargino and a b quark ({tilde t}1 → {tilde {chi}}1 b) are obtained for scalar top quark masses of 130-190 GeV and chargino masses of 90-150 GeV.
Search For Admixture Of Scalar Top Quarks In The T Anti T Lepton Jets Final State At S 1 2
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Author :
language : en
Publisher:
Release Date : 2009
Search For Admixture Of Scalar Top Quarks In The T Anti T Lepton Jets Final State At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
A search for pair production of the lightest supersymmetric partner of the top quark, {tilde t}1, is performed in the lepton+jets channel using 0.9 fb−1 of data collected by the D0 experiment. Kinematic differences between {tilde t}1{bar {tilde t}}1 and the dominant top quark pair production background are used to separate the two processes. First limits from Run II of the Fermilab Tevatron Collider for the scalar top quark decaying to a chargino and a b quark ({tilde t}1 2!{tilde {chi}}1 b) are obtained for scalar top quark masses of 130-190 GeV and chargino masses of 90-150 GeV.
Search For Vector Like T Quarks Using Events With Oppositely Charged Lepton Pairs And Jets In Proton Proton Collisions At Centre Of Mass Energy Of 13 Tev With Cms Detector
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Author : Dalath Rachitha Asanga Mendis
language : en
Publisher:
Release Date : 2019
Search For Vector Like T Quarks Using Events With Oppositely Charged Lepton Pairs And Jets In Proton Proton Collisions At Centre Of Mass Energy Of 13 Tev With Cms Detector written by Dalath Rachitha Asanga Mendis 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.
A search is performed for heavy vector-like top quark partner (T) with electric charge +2/3 by using proton-proton collision events from Large Hadron Collider (LHC) at a centre- of-mass energy of 13 TeV. The data corresponds to an integrated luminosity of 35.9fb−1 collected by the Compact Muon Solenoid (CMS) experiment during 2016. The production of this new hypothetical particle is assumed to be in pairs and strong interaction is responsible for such production mechanism. T quarks can decay to various combinations of third generation quarks and standard model bosons: T → bW, tZ, or tH, and hence the final states consist of pair of opposite-sign leptons consistent with coming from a Z boson and jets. No significant excess has been observed and hence 95% CL upper limits are obtained on TT production cross section by assuming different branching ratios. T quark mass values below 1280 GeV are excluded in case of 100% branching fraction for T → tZ.
Search For Single Production Of A Heavy Vector Like T Quark Decaying To A Higgs Boson And A Top Quark With A Lepton And Jets In The Final State
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Author :
language : en
Publisher:
Release Date : 2017
Search For Single Production Of A Heavy Vector Like T Quark Decaying To A Higgs Boson And A Top Quark With A Lepton And Jets In The Final State 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.