Search For Vectorlike B Quarks In Events With One Isolated Lepton Missing Transverse Momentum And Jets At Arrow
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Search For Vectorlike B Quarks In Events With One Isolated Lepton Missing Transverse Momentum And Jets At Arrow
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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 Arrow 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 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 Single Production Of Vector Like Quarks Decaying Into A B Quark And A W Boson In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2017
Search For Single Production Of Vector Like Quarks Decaying Into A B Quark And A W Boson 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.
A search is presented for a heavy vector-like quark, decaying into a b quark and a W boson, which is produced singly in association with a light flavor quark and a b quark. The analysis is performed using a data sample of proton-proton collisions at a center-of-mass energy of $\sqrt{s} = $ 13 TeV collected at the LHC in 2015. The data set used in the analysis corresponds to an integrated luminosity of 2.3 inverse-femtobarns. The search is carried out using events containing one electron or muon, at least one b-tagged jet with large transverse momentum, at least one jet in the forward region of the detector, and missing transverse momentum. No excess over the standard model prediction is observed. Upper limits are placed on the production cross section of heavy exotic quarks: a T quark with a charge of 2/3, and a Y quark with a charge of -4/3. For Y quarks with coupling of 0.5 and B(Y to bW) = 100%, the observed (expected) lower mass limits are 1.40 (1.0) TeV. This is the most stringent limit to date on the single production of the Y vector-like quark.
Search For New Phenomena With Top Quark Pairs In Final States With One Lepton Jets And Missing Transverse Momentum In Pp Collisions At Square Root S
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2021
Search For New Phenomena With Top Quark Pairs In Final States With One Lepton Jets And Missing Transverse Momentum In Pp Collisions At Square Root S written by 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 2021 with categories.
Abstract: A search for new phenomena with top quark pairs in final states with one isolated electron or muon, multiple jets, and large missing transverse momentum is performed. Signal regions are designed to search for two-, three-, and four-body decays of the directly pair-produced supersymmetric partner of the top quark (stop). Additional signal regions are designed specifically to search for spin-0 mediators that are produced in association with a pair of top quarks and decay into a pair of dark-matter particles. The search is performed using the Large Hadron Collider proton-proton collision dataset at a centre-of-mass energy of s√ = 13 TeV recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1. No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set in the stop-neutralino mass plane and as a function of the mediator mass or the dark-matter particle mass. Stops are excluded up to 1200 GeV (710 GeV) in the two-body (three-body) decay scenario. In the four-body scenario stops up to 640 GeV are excluded for a stop-neutralino mass difference of 60 GeV. Scalar and pseudoscalar dark-matter mediators are excluded up to 200 GeV when the coupling strengths of the mediator to Standard Model and dark-matter particles are both equal to one and when the mass of the dark-matter particle is 1 GeV
Search For W U2192 Tb In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For W U2192 Tb 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 2016 with categories.
A search for dark matter particles directly produced in proton-proton collisions recorded by the CMS experiment at the LHC is presented. The data correspond to an integrated luminosity of 18.8 inverse femtobarns, at a center-of-mass energy of 8 TeV. The event selection requires at least two jets and no isolated leptons. The razor variables are used to quantify the transverse momentum balance in the jet momenta. The study is performed separately for events with and without jets originating from b quarks. The observed yields are consistent with the expected backgrounds and, depending on the nature of the production mechanism, dark matter production at the LHC is excluded at 90% confidence level for a mediator mass scale Lambda below 1 TeV. The use of razor variables yields results that complement those previously published.
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 Scalar Bottom Quarks In Compressed Final States With B Jets And Missing Transverse Momentum With The Atlas Detector
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Author : Mario Spina
language : en
Publisher:
Release Date : 2022
Search For Scalar Bottom Quarks In Compressed Final States With B Jets And Missing Transverse Momentum With The Atlas Detector written by Mario Spina 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.
Search For Fourth Generation Quarks In The Dilepton Channel At Atlas With Sqrt S
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Author : Michael Werth
language : en
Publisher:
Release Date : 2012
Search For Fourth Generation Quarks In The Dilepton Channel At Atlas With Sqrt S written by Michael Werth 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.
A search is presented for heavy-quark pair production (QQ̄) under the decay hypothesis QQ̄ to W+qW-q̄ with q = u,d,c,s,b. The search is performed with 1.04 fb-1 of integrated luminosity from pp collisions at √s = 7 TeV collected by the ATLAS detector at the CERN Large Hadron Collider (LHC). Events are selected with two oppositely-charged leptons (e or mu), large missing transverse momentum and at least two jets. Mass reconstruction of heavy quark candidates is performed by assuming that the W boson decay products are nearly collinear. The data are in agreement with Standard Model expectations; a heavy quark with mass less than 350 GeV is excluded at 95% confidence level.
Search For Pair Production Of Vector Like T And B Quarks In Single Lepton Final States Using Boosted Jet Substructure In Proton Proton Collisions At S
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Author :
language : en
Publisher:
Release Date : 2017
Search For Pair Production Of Vector Like T And B Quarks In Single Lepton Final States Using Boosted Jet Substructure In Proton Proton Collisions 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 2017 with categories.
Search For New Bottomlike Quark Pair Decays Q Q Bar To T W T Bar W In Same Charge Dilepton Events
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Author :
language : en
Publisher:
Release Date : 2012
Search For New Bottomlike Quark Pair Decays Q Q Bar To T W T Bar W In Same Charge Dilepton Events written by 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.
We report the most restrictive direct limits on masses of fourth-generation down-type quarks b′, and quark-like composite fermions (B or T53), decaying promptly to tW{sup {-+}}. We search for a significant excess of events with two same-charge leptons (e,?), several hadronic jets, and missing transverse energy. An analysis of data from p{bar p} collisions with an integrated luminosity of 2.7 fb−1 collected with the CDF II detector at Fermilab yields no evidence for such a signal, setting mass limits m{sub b{prime}}, m{sub B}> 338 GeV/c2 and m{sub T{sub 5}3}> 365 GeV/c2 at 95% confidence level.