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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (727 download)
Download or read book Search for Heavy Top-like Quarks Using Lepton Plus Jets Events in 1.96-TeV P Anti-p Collisions written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Search for Heavy Top-like Quarks T-rime ---] Wq Using Lepton Plus Jets Events in 1.96-TeV P Anti-p Collisions PDF Online Free](https://books.google.com/books/content/images/frontcover/QrWaAQAACAAJ?fife=w200-h370)
Author :
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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (727 download)
Download or read book Search for Heavy Top-like Quarks T-rime ---] Wq Using Lepton Plus Jets Events in 1.96-TeV P Anti-p Collisions written by and published by . This book was released on 2008 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for a new heavy top-like quark, tprime, decaying to a W boson and another quark using the CDF II Detector in Run II of the Tevatron ppbar collider. New top-like quarks are predicted in a number of models of new physics. Using a data sample corresponding to 2.8 fb-1 of integrated luminosity we fit the observed spectrum of total transverse energy and reconstructed quark mass to a combination of background plus signal. We see no evidence for tprime production, so use this result to set limits on the tprime tprimebar production cross section times the branching ratio of tprime to Wq and infer a lower limit of 311 GeV/c2 on the mass of the tprime at 95% CL.
Author : Diedi Hu
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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (95 download)
Download or read book Search for Heavy Down-Type Vector-Like Quarks in the Lepton-Plus-Jets Final State in 8 TeV Proton-proton Collisions Using the ATLAS Detector at the LHC written by Diedi Hu and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the chiral B scenario with a 100% branching ratio of the decay B->Wt, the observed (expected) 95% CL lower limit on the B mass is 814 GeV (756 GeV).
Download or read book Search for a Heavy Top-Like Quark in $p\bar{p}$ Collisions at ${\surd}s written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for pair production of a heavy top-like (t') quark decaying to W q final states using data corresponding to an integrated luminosity of 5.6 fb−1 collected by the CDF II detector in p{anti p} collisions at √{ovr s} = 1.96 TeV. We perform parallel searches for t' → W b and t' → W q (where q is a generic down-type quark) in events containing a lepton and four or more jets. By performing a fit to the two-dimensional distribution of total transverse energy versus reconstructed t' quark mass, we set upper limits on the t'{anti t}' production cross section and exclude a standard model fourth-generation t' quark decaying to W b (W q) with mass below 358 (340) GeV/c2 at 95% CL.
Author : Dalath Rachitha Asanga Mendis
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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (111 download)
Download or read book 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 published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book A Search for \(t\overline{t} \) Resonances Using Lepton-plus-jets Events in Proton-proton Collisions at \(\sqrt{s} written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb-1 of proton-proton collision data collected at a centre-of-mass energy of \(\sqrt{s}=8 \) TeV. The lepton-plus-jets final state is used, where the top pair decays to \({W}^{+}b{W}^{-}\overline{b} \), with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z' boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4 TeV to 3.0 TeV. A narrow leptophobic topcolour Z' boson with mass below 1.8 TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with [Gamma]/m = 15% decaying to \(t\overline{t} \). These range from 4.8 pb to 0.03 pb for masses from 0.4 TeV to 3.0 TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2 TeV.
![Download Search for a Heavy Top-like Quark in Pp̄ Collisions at [square Root] S PDF Online Free](https://books.google.com/books/content/images/frontcover/WRPLoAEACAAJ?fife=w200-h370)
Author : David J. Cox
Publisher :
ISBN 13 : 9781267967893
Total Pages : pages
Book Rating : 4.9/5 (678 download)
Download or read book Search for a Heavy Top-like Quark in Pp̄ Collisions at [square Root] S written by David J. Cox and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for pair production of a heavy top-like (t') quark decaying to Wq final states using data corresponding to an integrated luminosity of 5.6 fb−1 collected by the CDF II detector in proton-antiproton collisions at [square root s] = 1.96 TeV center of mass energy. A searche for t' --> Wb in events containing a lepton and four or more jets is conducted. By performing a fit to the two-dimensional distribution of total transverse energy versus reconstructed t' quark mass, we set upper limits on the t't̄' pair production cross section and exclude a standard model fourth-generation t' quark decaying to Wb with mass below 358 GeV/c2 at 95% CL.
Download or read book 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 published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for single production of vector-like top quark partners (T) decaying into a Higgs boson and a top quark is performed using data from pp collisions at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The top quark decay includes an electron or a muon while the Higgs boson decays into a pair of b quarks. No significant excess over standard model backgrounds is observed. Exclusion limits on the product of the production cross section and the branching fraction are derived in the T quark mass range 700 to 1800 GeV. For a mass of 1000 GeV, values of the product of the production cross section and the branching fraction greater than 0.8 and 0.7 pb are excluded at 95% confidence level, assuming left- and right-handed coupling of the T quark to standard model particles, respectively. This is the first analysis setting exclusion limits on the cross section of singly produced vector-like T quarks at a centre-of-mass energy of 13 TeV.
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (16 download)
Download or read book A Search for T{anti T} → Lepton + E{sub T} + Jets Signature in P{anti P} Collisions at √s written by and published by . This book was released on 1994 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the results from a search for t{anti t} production in p{anti p} collisions at √s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p{sub T} lepton (e or?), multiple jets and a substantial missing transverse energy (E{sub T}), excluding the events that have?-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb−1 of data taken during the 1992--1993 run of the Tevatron.
Download or read book CDF Top Quark Production and Mass written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The top search in the dilepton and lepton plus jets channels with the Collider Detector at Fermilab is presented. The analysis uses a 67 pb[sup[minus]1] sample of p[bar p] collisions at 1.8 TeV. A 4.8[sigma] excess of candidate events establishes the existence of the top quark. The t[bar t] production cross section is measured to be[sigma][sub t[bar t]]= 7.6[sub[minus]2.0][sup+2.4] pb with branching Br(t[yields] Wb)= 0.87[sub[minus]0.30][sup+0.13](stat)[sub[minus]0.11][sup+0.13](syst). The measured mass is M[sub top]= 176[plus-minus]8[plus-minus]10 GeV.
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for Pair Production of Scalar Top Quarks Decaying to a Tau Lepton and a B Quark in Ppbar Collisions at Sqrt{s} written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for pair production of scalar top quarks ({tilde t}1) in an R-parity violating supersymmetric scenario using 322 pb−1 of p{bar p} collisions at √s = 1.96 TeV collected by the upgraded Collider Detector at Fermilab. We assume each {tilde t}1 decays into a? lepton and a b quark with a branching ratio?, and that the final state contains either an electron or a muon from a leptonic? decay, a hadronically decaying? lepton, and two or more jets. Two candidate events pass our final selection criteria, consistent with the expectation from standard model processes. We present upper limits on the cross section times branching ratio squared?({tilde t}1{bar {tilde t}}1) x?2 as a function of the stop mass m({tilde t}1). Assuming? = 1, we set a 95% confidence level limit m({tilde t}1)> 153 GeV=c2 obtained using a next-to-leading order cross section. These limits are also fully applicable to the case of a pair produced third generation scalar leptoquark decaying into a? lepton and a b quark.
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (873 download)
Download or read book Search for the Lightest Scalar Top Quark in Events with Two Leptons in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download A Search for T[anti T] [yields] Lepton + E[sub T] + Jets Signature in P[anti P] Collisions at [radical] PDF Online Free](https://books.google.com/books/content/images/frontcover/NInTjwEACAAJ?fife=w200-h370)
Download or read book A Search for T[anti T] [yields] Lepton + E[sub T] + Jets Signature in P[anti P] Collisions at [radical] written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the results from a search for t[anti t] production in p[anti p] collisions at [radical]s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p[sub T] lepton (e or [mu]), multiple jets and a substantial missing transverse energy (E[sub T]), excluding the events that have [mu]-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb[sup [minus]1] of data taken during the 1992--1993 run of the Tevatron.
Author : Tobias F. Golling
Publisher :
ISBN 13 :
Total Pages : 299 pages
Book Rating : 4.:/5 (316 download)
Download or read book Measurements of the Top Quark Pair Production Cross Section in Lepton + Jets Final States Using a Topological Multivariate Technique as Well as Lifetime B-Tagging InProton - Anti-proton Collisions at S**(1/2) written by Tobias F. Golling and published by . This book was released on 2005 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two alternative measurements of the t{bar t} production cross section at {radical}s = 1.96 TeV in proton-antiproton collisions in the lepton+jets channel are presented. The t{bar t} production cross section is extracted by combining the kinematic event information in a multivariate discriminant. The measurement yields {sigma}{sub p{bar p} {yields} t{bar t} + x} = 5.13{sub -1.57}{sup +1.76}(stat){sub -1.10}{sup +0.96}(syst) {+-} 0.33 (lumi) pb in the muon+jets channel, using 229.1 pb{sup -1}, and in the combination with the electron+jets channel 226.3 pb{sup -1} {sigma}{sub p{bar p} {yields} t{bar t} + x} = 6.60{sub -1.28}{sup +1.37}(stat){sub -1.11}{sup +1.25}(syst) {+-} 0.43 (lumi) pb. The second measurement presented reconstructs explicitly secondary vertices to d lifetime b-tagging. The measurement combines the muon+jets and the electron+jets channel, using 158.4 pb{sup -1} and 168.8 pb{sup -1}, respectively: {sigma}{sub p{bar p} {yields} t{bar t} + x} = 8.24{sub -1.25}{sup +1.34}(stat){sub -1.63}{sup +1.89}(syst) {+-} 0.54 (lumi) pb.
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ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (16 download)
Download or read book Precision Top Quark Mass Measurement in the Lepton + Jets Topology in P Anti-p Collisions at $\sqrt{s} written by and published by . This book was released on 2005 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for the Lightest Scalar Top Quark in Events with Two Leptons in P Anti-p Collisions at S**ư written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data collected by the D0 detector at a p{bar p} center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider have been used to search for pair production of the lightest supersymmetric partner of the top quark decaying into bl{bar {nu}}. The search is performed in the ll′ = e? and?? final states. No evidence for this process has been found in data samples of approximately 400 pb−1. The domain in the [M({bar t}1), M({bar {nu}})] plane excluded at the 95% C.L. is substantially extended by this search.
Download or read book Search for $\mathrm{ T \bar{t} }$ Resonances in Highly-boosted Lepton+jets and Fully Hadronic Final States in Proton-proton Collisions at $ \sqrt{s} written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the production of heavy resonances decaying into top quark-antiquark pairs is presented. The analysis is performed in the lepton+jets and fully hadronic channels using data collected in proton-proton collisions at $\sqrt{s}$ =13 TeV using the CMS detector at the LHC, corresponding to an integrated luminosity of 2.6 inverse femtobarns. The selection is optimized for massive resonances, where the top quarks have large Lorentz boosts. No evidence for resonant ttbar production is found in the data, and upper limits on the production cross section of heavy resonances are set. The exclusion limits for resonances with masses above 2 TeV are significantly improved compared to those of previous analyses at $\sqrt{s}$ = 8 TeV.
