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 A SIMPLE RELATION AMONG THE QUARK MASSES

1995 ◽  
Vol 10 (03) ◽  
pp. 199-205 ◽  
Author(s):  
HIDEZUMI TERAZAWA
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Simple Relation ◽  
Top Quark Mass ◽  
Quark Masses ◽  
Recent Suggestion

Based on our recent suggestion that the first and second generations of quarks and leptons can be taken as almost and quasi Nambu–Goldstone fermions, respectively, we can derive a simple relation among the quark masses, [Formula: see text], from which the top quark mass is predicted to be mt ≅ (180±100) − (200±110) GeV .

$B_d^0 \mbox{-} \bar{B}_d^0$ MIXING AND TOP QUARK MASS IN A FIELD THEORETIC QUARK MODEL

1993 ◽  
Vol 08 (20) ◽  
pp. 1869-1876 ◽  
Author(s):  
L. MAHARANA ◽  
A. NATH ◽  
A.R. PANDA
Keyword(s):  
Standard Model ◽  
Harmonic Oscillator ◽  
Quark Model ◽  
Top Quark ◽  
Charge Radius ◽  
Quark Mass ◽  
Free Parameter ◽  
Top Quark Mass ◽  
Mixing Parameter

[Formula: see text] mixing is considered in the framework of standard model. Using the [Formula: see text] mixing parameter xd, the mass of the top quark is predicted in a field theoretic quark model. The prediction depends on the only free parameter of the model, i.e., the harmonic oscillator radius. However, once the charge radius of the [Formula: see text]-meson is measured, one can have a definite prediction for top quark mass.

scholarly journals The top quark mass and flavour mixing in a seesaw model of quark masses

1997 ◽  
Vol 410 (2-4) ◽  
pp. 233-240 ◽  
Author(s):  
T. Morozumi ◽  
T. Satou ◽  
M.N. Rebelo ◽  
M. Tanimoto
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Quark Masses ◽  
Seesaw Model

scholarly journals TOP MASS MEASUREMENT AND BOTTOM FRAGMENTATION AT THE LHC

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 372-374 ◽  
Author(s):  
GENNARO CORCELLA
Keyword(s):  
Top Quark ◽  
Fragmentation Function ◽  
Quark Mass ◽  
Mass Measurement ◽  
Top Quark Mass ◽  
Quark Fragmentation ◽  
Top Mass ◽  
Mass Reconstruction

We show some recent HERWIG results related to the top quark mass reconstruction at the LHC and discuss possible improvements for studies of the bootom quark fragmentation function in the top decay.

scholarly journals What Is the Top Quark Mass?

2020 ◽  
Vol 70 (1) ◽  
pp. 225-255 ◽  
Author(s):  
André H. Hoang
Keyword(s):  
Monte Carlo ◽  
Top Quark ◽  
Quark Mass ◽  
Mass Parameter ◽  
Hadron Collider ◽  
Monte Carlo Event ◽  
Top Quark Mass ◽  
Mass Measurements ◽  
Top Mass ◽  
Interpretation Problem

This review provides an overview of the conceptual issues regarding the interpretation of so-called direct top quark mass measurements, which are based on the kinematic reconstruction of top quark decay products at the Large Hadron Collider (LHC). These measurements quote the top mass parameter [Formula: see text] of Monte Carlo event generators with current uncertainties of around 0.5 GeV. The problem of finding a rigorous relation between [Formula: see text] and top mass renormalization schemes defined in field theory is unresolved to date and touches perturbative as well as nonperturbative aspects and the limitations of state-of-the-art Monte Carlo event generators. I review the status of LHC top mass measurements, illustrate how conceptual limitations enter the picture, and explain a controversy that has permeated the community in the context of the interpretation problem related to [Formula: see text]. I then summarize recent advances in acquiring first principles insights and outline what else has to be understood to fully resolve the issue. I conclude with recommendations on how to deal with the interpretation problem for the time being when making top mass–dependent theoretical predictions.

scholarly journals A MASS SPECTRUM FOR LEPTONS AND QUARKS

1993 ◽  
Vol 08 (16) ◽  
pp. 1519-1526
Author(s):  
GIANPIERO MANGANO ◽  
FRANCESCO SANNINO
Keyword(s):  
Mass Spectrum ◽  
Top Quark ◽  
Quark Mass ◽  
Top Quark Mass ◽  
Quark Masses ◽  
Range Of Values ◽  
Insight Into

A suggestive phenomenological relation is found among the lepton and quark masses which suggests a new insight into the problem of generations and also gives a prediction for the top quark mass in agreement with the range of values which is actually expected.

RG-IMPROVED BOUNDS ON HIGGS BOSON AND TOP QUARK MASSES FROM ELECTROWEAK BARYOGENESIS

1994 ◽  
Vol 09 (05) ◽  
pp. 459-464 ◽  
Author(s):  
A.S. MAJUMDAR ◽  
S.K. SETHI ◽  
S. MAHAJAN ◽  
A. MUKHERJEE ◽  
N. PANCHAPAKESAN ◽  
...  
Keyword(s):  
Renormalization Group ◽  
Higgs Boson ◽  
Top Quark ◽  
Quark Mass ◽  
Higgs Mass ◽  
Higgs Doublet ◽  
Baryon Asymmetry ◽  
Top Quark Mass ◽  
Quark Masses ◽  
Doublet Model

Electroweak baryogenesis in a single Higgs doublet model is considered. A renormalization group-improved effective potential is used. The requirement that the created baryon asymmetry is not washed out leads to bounds on the Higgs mass which vary significantly with the top quark mass.

EVADING THE TOP MASS BOUND IN THE FRITZSCH SCHEME

1992 ◽  
Vol 07 (04) ◽  
pp. 309-313 ◽  
Author(s):  
SUBHASH RAJPOOT
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Mass Matrix ◽  
Diagonal Element ◽  
Present Knowledge ◽  
Top Quark Mass ◽  
Mixing Angles ◽  
Mass Matrices ◽  
Top Mass ◽  
Existing Data

The Fritzsch ansatz for the quark mass matrices will run into conflict with the existing data on the Cabibbo-Kobyashi-Maskawa mixing angles if the top quark mass turns out to be much greater than 90 GeV. A modification of the Fritzsch scheme is presented in which only one diagonal element of the quark mass matrix vanishes. The new scheme is still simple to analyze exactly and can easily accommodate top quark mass as heavy as 250 GeV or more without conflicting with our present knowledge on the weak interaction mixing angles.

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