SIGNATURES AND MASS DETERMINATION OF HEAVY TOP QUARKS AT THE SSC

1987 ◽  
Vol 02 (04) ◽  
pp. 1255-1261 ◽  
Author(s):  
H.-U. Bengtsson ◽  
E.W.N. Glover
Keyword(s):  
Top Quark ◽  
Charged Lepton ◽  
Quark Mass ◽  
Simple Technique ◽  
Top Quarks ◽  
Mass Determination ◽  
200 Gev ◽  
O 10

A simple technique for selecting top quark events and reconstructing the quark mass is given for 100<Mt<200 GeV . Using a charged lepton with large pT to trigger the event, simple attempts to reconstruct the quark mass from jets indicate that the quark mass may be measured to O(10%).

scholarly journals Top-quark mass determination from t-channel single top production at the LHC

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Mei Sen Gao ◽  
Shu Run Yuan ◽  
Jun Gao
Keyword(s):  
Top Quark ◽  
Charged Lepton ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Narrow Width Approximation ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production ◽  
Narrow Width

Abstract We study the determination of the top-quark mass using leptonic observables in t-channel single top-quark production at the LHC. We demonstrate sensitivity of transverse momentum of the charged lepton on the input top-quark mass. We present predictions at next-to-next-to-leading order (NNLO) in QCD with narrow width approximation and structure function approach. Further corrections due to parton shower and hadronization, non-resonant and non-factorized contributions are discussed. To reduce impact of SM backgrounds we propose to use the charge weighted distribution for the measurement, i.e., differences between distributions of charged lepton with positive and negative charges. By modeling both signal and background processes, we found the projections for (HL-)LHC to be promising, with a total theoretical uncertainty on the extracted top-quark mass of about 1 ∼ 2 GeV.

scholarly journals Determination of the top-quark mass from hadro-production of single top-quarks

2016 ◽  
Vol 763 ◽  
pp. 341-346 ◽  
Author(s):  
S. Alekhin ◽  
S. Moch ◽  
S. Thier
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Top Quarks ◽  
Top Quark Mass ◽  
Single Top

scholarly journals ZH production in gluon fusion: two-loop amplitudes with full top quark mass dependence

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Long Chen ◽  
Gudrun Heinrich ◽  
Stephen P. Jones ◽  
Matthias Kerner ◽  
Jonas Klappert ◽  
...  
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Gluon Fusion ◽  
Top Quarks ◽  
Mass Dependence ◽  
Finite Part ◽  
Top Quark Mass ◽  
Helicity Amplitudes ◽  
Quark Mass Dependence ◽  
Loop Amplitudes

Abstract We present results for the two-loop helicity amplitudes entering the NLO QCD corrections to the production of a Higgs boson in association with a Z -boson in gluon fusion. The two-loop integrals, involving massive top quarks, are calculated numerically. Results for the interference of the finite part of the two-loop amplitudes with the Born amplitude are shown as a function of the two kinematic invariants on which the amplitudes depend.

scholarly journals Invariant-mass distribution of top-quark pairs and top-quark mass determination

2020 ◽  
Vol 44 (9) ◽  
pp. 091001
Author(s):  
Wan-Li Ju ◽  
Guoxing Wang ◽  
Xing Wang ◽  
Xiaofeng Xu ◽  
Yongqi Xu ◽  
...  
Keyword(s):  
Invariant Mass ◽  
Mass Distribution ◽  
Top Quark ◽  
Quark Mass ◽  
Invariant Mass Distribution ◽  
Mass Determination ◽  
Top Quark Mass ◽  
Quark Pairs ◽  
Top Quark Pairs

QCD CORRECTION FACTORS FOR $K^0 -\overline K^0$ MIXING FOR LARGE TOP QUARK MASS

1990 ◽  
Vol 05 (11) ◽  
pp. 877-885 ◽  
Author(s):  
JONATHAN M. FLYNN
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Correction Factors ◽  
Top Quark Mass ◽  
Factor B ◽  
Quark Masses ◽  
Effective Lagrangian ◽  
Mixing Parameter ◽  
200 Gev ◽  
Top Mass

I modify the calculation of the QCD correction factors in the ΔS = 2 effective Lagrangian for [Formula: see text] mixing to allow top quark masses in the range 50 GeV to 200 GeV. I give constraints on the top mass and Kobayashi-Maskawa phase, determined from the measured [Formula: see text] mixing parameter ε, and find that the factor BK and the ratio |Vub/Vcb| cannot both be smalI if mt < 200 GeV .

scholarly journals REVIEW OF PROPERTIES OF THE TOP QUARK FROM MEASUREMENTS AT THE TEVATRON

2009 ◽  
Vol 24 (16n17) ◽  
pp. 2899-3037 ◽  
Author(s):  
MARC-ANDRÉ PLEIER
Keyword(s):  
Top Quark ◽  
Particle Physics ◽  
Quark Mass ◽  
Center Of Mass ◽  
Top Quarks ◽  
Mass Energy ◽  
Fundamental Particle ◽  
Proton Antiproton ◽  
Center Of Mass Energy ◽  
Elementary Particle Physics

This review summarizes the program in the physics of the top quark being pursued at Fermilab's Tevatron proton–antiproton collider at a center-of-mass energy of 1.96 TeV. More than a decade after the discovery of the top quark at the two collider detectors CDF and D0, the Tevatron has been the only accelerator to produce top quarks and to study them directly.The Tevatron's increased luminosity and center-of-mass energy offer the possibility to scrutinize the properties of this heaviest fundamental particle through new measurements that were not feasible before, such as the first evidence for electroweak production of top quarks and the resulting direct constraints on the involved couplings. Better measurements of top quark properties provide more stringent tests of predictions from the SM of elementary particle physics. In particular, the improvement in measurements of the mass of the top quark, with the latest uncertainty of 0.7% marking the most precisely measured quark mass to date, further constrains the prediction of the mass of the still to be discovered Higgs boson.

HEURISTIC DEVELOPMENT OF A DIRAC–GOLDHABER MODEL FOR LEPTON AND QUARK STRUCTURE

2007 ◽  
Vol 22 (04) ◽  
pp. 283-288 ◽  
Author(s):  
GERALD ROSEN
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Fundamental Length ◽  
Spherical Surfaces ◽  
Length Constant ◽  
Majorana Neutrinos ◽  
Quark Structure ◽  
Charged Leptons ◽  
O 10

All three charged lepton pole masses are given to O(10-5) accuracy by [Formula: see text], where θk = 2πk/3 + 2/9 with the generation number k = 1, 2, 3. In the context of a Dirac model, it is shown that this empirical formula for the charged leptons admits a satisfactory S3-parametrized extension for the scale-independent pole masses of quarks and Majorana neutrinos; in particular, the top quark mass emerges as 177.698 GeV. A physical-geometrical interpretation of the mass formula supports Dirac's and Goldhaber's proposals: leptons and quarks of the same generation are identical in size and shape. Specifically, their self-interaction mass appears to be concentrated on spherical surfaces of radii [Formula: see text], in which the Kähler radial complex coordinate zk is a root of the Calabi–Yau condition [Formula: see text] for the envelopment of the particle surfaces and ℓ is a fundamental length constant.

LIMITS ON NEW FERMIONS FROM $p\bar p$ COLLIDER DATA

1987 ◽  
Vol 02 (07) ◽  
pp. 505-511
Author(s):  
THOMAS G. RIZZO
Keyword(s):  
Top Quark ◽  
Charged Lepton ◽  
Quark Mass ◽  
Fourth Generation ◽  
Top Quark Mass

Recent data from the UA2 Collaboration is used to place new limits on the top quark mass as well as hypothetical new fermions such as additional light neutrinos, a fourth generation charged lepton L, a fourth generation [Formula: see text] down-type quark b′, as well as the [Formula: see text] isosinglet E6 exotic quark D.

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