The Search for Single Top Quark Production in the Muon plus Jets Channel at DØ

2005 ◽  
Vol 20 (14) ◽  
pp. 3190-3192
Author(s):  
◽  
Leonard Christofek
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Decay Channel ◽  
Production Cross ◽  
Center Of Mass ◽  
Muon Channel ◽  
Center Of Mass Energy ◽  
Single Top ◽  
Top Quark Production ◽  
Muon Plus Jets

We have performed a search for the electroweak production of single top quarks in [Formula: see text] collisions at the Fermilab Tevatron at a center of mass energy of [Formula: see text]. The search was performed in the muon plus jets decay channel requiring at least one b-tagged jet. The data were collected using the DØ detector between August 2002 and September 2003 corresponding to an integrated luminosity of 158 pb-1. The resulting 95% C.L. upper limits on the production cross sections are 27 pb in the s-channel, 41 pb in the t-channel, and 36 pb in the combined s + t channel using the secondary vertex tagger (SVT) algorithm. We also present results from the combined electron and muon channel search using the DØ detector.

scholarly journals Top quark anomalous couplings at the high-luminosity phase of the LHC

2019 ◽  
Vol 34 (18) ◽  
pp. 1950142 ◽  
Author(s):  
Frédéric Déliot ◽  
Miguel C. N. Fiolhais ◽  
António Onofre
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
W Boson ◽  
Production Cross ◽  
Hadron Collider ◽  
Center Of Mass ◽  
High Luminosity ◽  
Anomalous Couplings ◽  
Center Of Mass Energy ◽  
Single Top

The combination of the latest and most precise measurements of several top quark properties is presented in this paper in order to establish allowed regions on anomalous contributions to the Lorentz structure of the Wtb vertex. These measurements include single top production cross-sections, W boson helicity fractions and forward–backward asymmetries, both at Tevatron and at the Large Hadron Collider (LHC), up to a center-of-mass energy of 13 TeV. The results obtained at 95% Confidence Level (CL) for the top quark anomalous couplings are compared with the limits extracted from a combination that includes the expected measurements at the future High-Luminosity run of the LHC.

scholarly journals Bounds on the Electromagnetic Dipole Moments through the Single Top Production at the CLIC

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
M. Köksal ◽  
A. A. Billur ◽  
A. Gutiérrez-Rodríguez
Keyword(s):  
Top Quark ◽  
Dipole Moments ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Center Of Mass Energy ◽  
Systematic Uncertainties ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

We obtain bounds on the anomalous magnetic and electric dipole moments of thet-quark from a future high-energy and high-luminosity linear electron positron collider, as the CLIC, with polarized and unpolarized electron beams which are powerful tools for determining new physics. We consider the processesγe-→t¯bνe(γis the Compton backscattering photon) ande+e-→e-γ⁎e+→t¯bνee+(γ⁎is the Weizsacker-Williams photon) as they are one of the most important sources of single top quark production. For systematic uncertainties ofδsys=0%  (5%),b-tagging  efficiency=0.8, center-of-mass energy ofs=3 TeV, and integrated luminosity ofL=2ab-1the futuree+e-collider may put bounds on the electromagnetic dipole momentsa^Vanda^Aof the top quark of the order ofO(10-2–10-1)at the2σ  (3σ)level, which are competitive with those recently reported in previous studies at hadron colliders and the ILC.

scholarly journals Measurements of angular distance and momentum ratio distributions in three-jet and $${\text {Z}}$$ + two-jet final states in $${\text {p}}{\text {p}}$$ collisions

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
T. Bergauer ◽  
M. Dragicevic ◽  
...  
Keyword(s):  
Cross Sections ◽  
Decay Channel ◽  
Production Cross ◽  
Center Of Mass ◽  
Large Angle ◽  
Angular Separation ◽  
Angular Distance ◽  
Proton Proton ◽  
Center Of Mass Energy ◽  
Integrated Luminosity

AbstractCollinear (small-angle) and large-angle, as well as soft and hard radiations are investigated in three-jet and $${\text {Z}}$$ Z  + two-jet events collected in proton-proton collisions at the LHC. The normalized production cross sections are measured as a function of the ratio of transverse momenta of two jets and their angular separation. The measurements in the three-jet and $${\text {Z}}$$ Z  + two-jet events are based on data collected at a center-of-mass energy of 8$$\,{\text {TeV}}$$ TeV , corresponding to an integrated luminosity of 19.8$$\,\text {fb}^{-1}$$ fb - 1 . The $${\text {Z}}$$ Z  + two-jet events are reconstructed in the dimuon decay channel of the $${\text {Z}}$$ Z  boson. The three-jet measurement is extended to include $$\sqrt{s} = 13\,{\text {TeV}} $$ s = 13 TeV data corresponding to an integrated luminosity of 2.3$$\,\text {fb}^{-1}$$ fb - 1 . The results are compared to predictions from event generators that include parton showers, multiple parton interactions, and hadronization. The collinear and soft regions are in general well described by parton showers, whereas the regions of large angular separation are often best described by calculations using higher-order matrix elements.

scholarly journals Measurements of single top quark production cross sections and|Vtb|inpp¯collisions ats=1.96  TeV

2011 ◽  
Vol 84 (11) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
B. S. Acharya ◽  
M. Adams ◽  
T. Adams ◽  
...  
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Production Cross ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

scholarly journals Top cross-sections and single top

2014 ◽  
Vol 31 ◽  
pp. 1460277 ◽  
Author(s):  
Reinhard Schwienhorst ◽  
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Cross Sections ◽  
Top Quark ◽  
Production Cross ◽  
Decay Modes ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

This paper summarizes top quark cross-section measurements at the Tevatron and the LHC. Top quark pair production cross-sections have been measured in all decay modes by the ATLAS and CMS collaborations at the LHC and by the CDF and D0 collaborations at the Tevatron. Single top quark production has been observed at both the Tevatron and the LHC. The t-channel and associated Wt production modes have been observed at the LHC and evidence for s-channel production has been reported by the Tevatron collaborations.

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