scholarly journals Evidence for Top Quark Production in pp Collisions at vs = 1.8 TeV

1995 ◽  
Vol 48 (2) ◽  
pp. 207
Author(s):  
Paul L Tipton for the CDF Collaboration
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Quark Mass ◽  
W Boson ◽  
Production Cross ◽  
W Bosons ◽  
Top Quark Mass ◽  
Pp Collisions ◽  
Top Quark Production ◽  
Quark Production

We summarise a search for the top quark with the Collider Detector at Fermilab (CDF) in a sample of pp collisions at Vs = 1� 8 Te V with an integrated luminosity of 19�3 pb ~ 1. We find 12 events consistent with either two W bosons, or a W boson and at least one b jet. Both of these are signatures for tt events. The probability that the measured yield is consistent with the background is 0�26%. Though the statistics are too limited to establish firmly the existence of the top quark, a natural interpretation of the excess is that it is due to tt production. Under this assumption, constrained fits to individual events yield a top quark mass of 174 � lO:::g GeV / c2? The tt production cross section is measured to be 13.9:::~:~ pb.

OBSERVATION OF THE TOP QUARK

1996 ◽  
Vol 11 (21) ◽  
pp. 3819-3848
Author(s):  
SOO-BONG KIM
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Production Cross ◽  
Top Quark Mass ◽  
Text Production ◽  
Top Quark Production ◽  
Top Quark Decay ◽  
Quark Production ◽  
Quark Decay ◽  
Kinematic Properties

Top-quark production is observed in [Formula: see text] collisions at [Formula: see text] at the Fermilab Tevatron. The CDF and DØ collaborations observe signals consistent with [Formula: see text] to [Formula: see text] but inconsistent with the background prediction by 4.8σ (CDF) and 4.6σ (DØ). Additional evidence for the top quark is provided by a peak in the reconstructed mass distribution. The kinematic properties of the excess events are consistent with the top-quark decay. The top-quark mass has been measured to be 176±8 (stat.) ±10 (sys.) GeV /c2 (CDF) and [Formula: see text]±22(sys.)GeV/c2 (DØ), and the [Formula: see text]-production cross section to be [Formula: see text] and 6.4±2.2 pb (DØ).

scholarly journals Measurement of single top-quark production in association with a W boson in the single-lepton channel at $$\sqrt{s} = 8\,\text {TeV}$$ with the ATLAS detector

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
K. Abeling ◽  
...  
Keyword(s):  
Neural Network ◽  
Cross Section ◽  
Top Quark ◽  
W Boson ◽  
Production Cross ◽  
Hadron Collider ◽  
Atlas Detector ◽  
Proton Proton ◽  
Top Quark Production ◽  
Quark Production

AbstractThe production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at $$\sqrt{s} = 8\,\text {TeV}$$ s = 8 TeV . The dataset corresponds to an integrated luminosity of $$20.2\,\text {fb}^{-1}$$ 20.2 fb - 1 , and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant $$t{\bar{t}}$$ t t ¯ background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying W boson. The measured cross-section is $$\sigma _{tW} = 26 \pm 7\,\text {pb}$$ σ tW = 26 ± 7 pb , in good agreement with the Standard Model expectation.

scholarly journals Measurement of the t-channel single top-quark production cross section in pp collisions at s=7 TeV with the ATLAS detector

2012 ◽  
Vol 717 (4-5) ◽  
pp. 330-350 ◽  
Author(s):  
G. Aad ◽  
B. Abbott ◽  
J. Abdallah ◽  
S. Abdel Khalek ◽  
A.A. Abdelalim ◽  
...  
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Production Cross Section ◽  
Production Cross ◽  
Atlas Detector ◽  
Pp Collisions ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

scholarly journals Measurement of the tt¯ production cross section and top quark mass extraction using dilepton events in pp¯ collisions

2009 ◽  
Vol 679 (3) ◽  
pp. 177-185 ◽  
Author(s):  
V.M. Abazov ◽  
B. Abbott ◽  
M. Abolins ◽  
B.S. Acharya ◽  
M. Adams ◽  
...  
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Production Cross Section ◽  
Quark Mass ◽  
Production Cross ◽  
Top Quark Mass ◽  
Dilepton Events

scholarly journals Probing anomalous off-shell electroweak dipole moment of the top quark in single top quark production associated with Z or W bosons

2019 ◽  
Vol 222 ◽  
pp. 04009
Author(s):  
Edward Boos ◽  
Vyacheslav Bunichev ◽  
Lev Dudko ◽  
Georgii Vorotnikov
Keyword(s):  
Dipole Moment ◽  
Top Quark ◽  
Covariant Derivative ◽  
W Boson ◽  
Z Bosons ◽  
W Bosons ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

An extension of the previous studies of anomalous Wtb interaction with offshell W boson was considered in associated single top quark production with W or Z bosons. More general variant with covariant derivative DµW−µ b−(fLWPL + fRWPR)t for the same processes is considered in this paper.

scholarly journals Top quark production near threshold and the top quark mass

1999 ◽  
Vol 454 (1-2) ◽  
pp. 137-146 ◽  
Author(s):  
M. Beneke ◽  
A. Signer ◽  
V.A. Smirnov
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Top Quark Production ◽  
Quark Production ◽  
Near Threshold
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