scholarly journals MASS SHELL SMEARING EFFECTS IN TOP PAIR PRODUCTION

2012 ◽  
Vol 27 (13) ◽  
pp. 1250072 ◽  
Author(s):  
V. I. KUKSA ◽  
R. S. PASECHNIK ◽  
D. E. VLASENKO
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Top Quark ◽  
Preliminary Analysis ◽  
Mass Shell ◽  
Threshold Region ◽  
Suggested Approach ◽  
Unstable Particles ◽  
Higher Order Corrections ◽  
Good Agreement

The top quark pair production and decay are considered in the framework of the smeared-mass unstable particles model. The results for total and differential cross-sections in vicinity of [Formula: see text] threshold are in good agreement with the previous ones in the literature. The strategy of calculations of the higher order corrections in the framework of the model is discussed. Suggested approach significantly simplifies calculations compared to the standard perturbative one and can serve as a convenient tool for fast and precise preliminary analysis of processes involving intermediate timelike top quark exchanges in the near-threshold region.

scholarly journals NEAR-THRESHOLD Z-PAIR PRODUCTION IN THE MODEL OF UNSTABLE PARTICLES WITH SMEARED MASS

2008 ◽  
Vol 23 (25) ◽  
pp. 4125-4132 ◽  
Author(s):  
V. I. KUKSA ◽  
R. S. PASECHNIK
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Pair Production ◽  
Suggested Approach ◽  
Unstable Particles ◽  
Good Agreement ◽  
Near Threshold

Near-threshold production of neutral boson pairs is considered within the framework of the model of unstable particles with smeared mass. The results of calculations are in good agreement with LEP II data and Monte Carlo simulations. Suggested approach significantly simplifies calculations with respect to standard perturbative one.

scholarly journals NEAR-THRESHOLD W-PAIR PRODUCTION IN THE MODEL OF UNSTABLE PARTICLES WITH SMEARED MASS

2009 ◽  
Vol 24 (31) ◽  
pp. 5765-5777 ◽  
Author(s):  
V. I. KUKSA ◽  
R. S. PASECHNIK
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Pair Production ◽  
Suggested Approach ◽  
Unstable Particles ◽  
Charged Boson ◽  
Good Agreement ◽  
Near Threshold

Near-threshold production of charged boson pairs is considered within the framework of the model of unstable particles with smeared mass. The results of calculations are in good agreement with LEP II data and Monte Carlo simulations. Suggested approach significantly simplifies calculations with respect to standard perturbative one.

scholarly journals Associated top quark pair production with a heavy boson: differential cross sections at NLO + NNLL accuracy

2020 ◽  
Vol 80 (5) ◽  
Author(s):  
Anna Kulesza ◽  
Leszek Motyka ◽  
Daniel Schwartländer ◽  
Tomasz Stebel ◽  
Vincent Theeuwes
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Differential Cross ◽  
Top Quark ◽  
Differential Cross Sections ◽  
Heavy Boson

scholarly journals Top quark studies with the ATLAS detector

2015 ◽  
Vol 39 ◽  
pp. 1560092
Author(s):  
Marcella Capua
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Top Quark ◽  
W Boson ◽  
Production Cross ◽  
Charge Asymmetry ◽  
Atlas Detector ◽  
Top Quark Production ◽  
Top Pair Production ◽  
8 Tev

The latest top quark studies in proton-proton collisions at a centre-of-mass energy of 7 and 8 TeV with the ATLAS detector are reported. We present recent results on the top pair production inclusive cross-sections, top pair production differential cross-section in the resolved and boosted regimes, single top-quark production cross-sections measured in the t-channel, s-channel and W-boson associated processes, as well as the determination of the CKM matrix element [Formula: see text]. The results are compared with theoretical expectations. Latest ATLAS results on top properties will be also shown in terms of direct and pole mass, spin correlations and charge asymmetry.

scholarly journals Higher Order Corrections to Spin Correlations in Top Quark Pair Production at the LHC

2019 ◽  
Vol 123 (8) ◽  
Author(s):  
Arnd Behring ◽  
Michał Czakon ◽  
Alexander Mitov ◽  
Rene Poncelet ◽  
Andrew S. Papanastasiou
Keyword(s):  
Pair Production ◽  
Top Quark ◽  
Higher Order ◽  
Spin Correlations ◽  
Higher Order Corrections

scholarly journals MEASUREMENT AND INTERPRETATION OF LEPTON-PAIR PRODUCTION AT LEP2 ENERGIES

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 336-338
Author(s):  
ANETTE BEHRMANN
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Preliminary Analysis ◽  
Center Of Mass ◽  
New Physics ◽  
Lepton Pair ◽  
Lepton Pair Production ◽  
Delphi Detector ◽  
The Standard Model ◽  
Model Predictions

A preliminary analysis of the lepton-pair production in e+e- annihilations at LEP2 center-of-mass energies using the data collected between 130 GeV and LEP2 highest energies (i.e. exceeding 205 GeV) with the DELPHI detector is presented. The values obtained for the cross-sections and forword-backward asymmetries are used to test the Standard Model predictions and to derive limits for possible new physics phenomena beyond it.

EXTRA NEUTRAL GAUGE BOSON FROM THE 3-3-1 MODEL AND THE SPIN CORRECTION OF TOP QUARK PAIR PRODUCTION AT THE ILC

2009 ◽  
Vol 24 (16) ◽  
pp. 1307-1315 ◽  
Author(s):  
YAO-BEI LIU ◽  
XUE-LEI WANG
Keyword(s):  
Pair Production ◽  
Gauge Boson ◽  
Cross Sections ◽  
Top Quark ◽  
Z Boson ◽  
High Energy ◽  
Numerical Results ◽  
Spin Configuration ◽  
Neutral Gauge Boson ◽  
Quark Pairs

In the off-diagonal basis, we explore the effects of extra neutral gauge boson Z' predicted in two versions of SU (3)C × SU (3)L × U (1)X model on the spin configuration of the top quark pair production in the high energy linear e+e- collider (ILC). Our numerical results show that, the cross sections for the suppressed spin configurations can be enhanced with the effects of the Z' boson through the modification of the spin configuration by producing enough top quark pairs to be measured in the future ILC experiments, which provides the way to observe the effects of Z' predicted in the 3-3-1 model and discriminate the various versions of 3-3-1 model.

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