POSSIBLE DEVIATIONS IN Z0 PAIR PRODUCTION AT e+e− COLLIDERS DUE TO EXOTIC LEPTON MIXINGS

1990 ◽  
Vol 05 (08) ◽  
pp. 605-612
Author(s):  
A.K. NAGAWAT ◽  
SARDAR SINGH ◽  
N.K. SHARMA
Keyword(s):  
Standard Model ◽  
Differential Cross Section ◽  
Pair Production ◽  
Cross Section ◽  
Differential Cross ◽  
Linear Collider ◽  
Longitudinal Polarization ◽  
Polarization Asymmetry ◽  
Distinctive Features ◽  
Model Predictions

The deviations from standard model predictions for the pair production of Z0 at e+e− colliders with the inclusion of mixing between ordinary and exotic leptons are evaluated for (i) the differential cross section and (ii) the longitudinal polarization asymmetry at LEP II [Formula: see text] and at possible the next linear collider [Formula: see text] energies. For heavy exotic leptons (mE ~ 250 GeV) the deviations have distinctive features that could allow the possibility of distinguishing between mirror, vector-doublet and vector-singlet type of exotic lepton mixings.

scholarly journals Top Quark Pair-Production in Noncommutative Standard Model

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
M. Fisli ◽  
N. Mebarki
Keyword(s):  
Lower Bound ◽  
Standard Model ◽  
Differential Cross Section ◽  
Pair Production ◽  
Cross Section ◽  
Differential Cross ◽  
Top Quark ◽  
Tree Level ◽  
Hadron Collision ◽  
Geometry Parameter

The differential cross-section of the top quark pair production via the quark-antiquark annihilation subprocess in hadron collision is calculated within the noncommutative standard model. A pure NC analytical expression for the forward-backward asymmetry at the tree level is obtained. Moreover, using recent Tevatron results from the full RUN2 data, a new lower bound on the noncommutative geometry parameter is deduced.

Drell-Yan Production at the Fermilab Tevatron

2005 ◽  
Vol 20 (15) ◽  
pp. 3236-3239
Author(s):  
◽  
JEDONG LEE
Keyword(s):  
Standard Model ◽  
Differential Cross Section ◽  
Invariant Mass ◽  
Cross Section ◽  
Differential Cross ◽  
Charge Asymmetry ◽  
New Physics ◽  
The Standard Model ◽  
Model Predictions ◽  
Using Data

Using data from [Formula: see text] collisions at [Formula: see text] collected by the CDF and DØ detectors, we present measurements of the Drell-Yan inclusive differential cross section and forward-backward charge asymmetry as a function of invariant mass. We compare these measurements with Standard Model predictions, and present searches for new physics that could appear as deviations from the Standard Model in the Drell-Yan differential cross section.

NOTE ON THE MEASUREMENT OF y-DEPENDENCE IN NEUTRINO-ELECTRON SCATTERING: A SENSITIVE TEST OF THE STANDARD MODEL

1993 ◽  
Vol 02 (04) ◽  
pp. 915-921 ◽  
Author(s):  
C. RANGACHARYULU ◽  
A. RICHTER
Keyword(s):  
Standard Model ◽  
Differential Cross Section ◽  
Cross Section ◽  
Electron Scattering ◽  
Differential Cross ◽  
Sensitive Test ◽  
Testing Ground ◽  
The Standard Model ◽  
Sensitive Testing

It is pointed out that the y-dependence of the differential cross-section for various types of neutrinos on the electron promises to be a sensitive testing ground of the electroweak Standard Model at KAON in Vancouver. Estimates of the flux requirements are given and the feasibility of such experiments is discussed.

scholarly journals Influence of Neutral Currents on Electron and Gamma Polarizations in the Processe+N→e′+N+γ

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
N. V. Samsonenko ◽  
Adamou Ousmane Manga ◽  
Almoustapha Aboubacar ◽  
Aboubacar Moussa
Keyword(s):  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Cross Section ◽  
Differential Cross ◽  
Longitudinal Polarization ◽  
Neutral Currents ◽  
Photon Polarization ◽  
Weak Neutral Currents ◽  
Yield Information ◽  
Electron And Photon

The differential cross section of electron inelastic scattering by nuclei followed byγradiation is calculated using the multipole decomposition of the hadronic currents and by taking into account the longitudinal polarization of the initial electron and the circular polarization of theγradiation. We performed the analysis of the angular and energy dependence of the degree of electron and photon polarization which can yield information on values of weak neutral currents parameters.

MIXING EFFECTS OF MIRROR LEPTONS IN e+e− → W+W− AT LEP II

1990 ◽  
Vol 05 (22) ◽  
pp. 1717-1729 ◽  
Author(s):  
SARDAR SINGH ◽  
A. K. NAGAWAT ◽  
N. K. SHARMA
Keyword(s):  
Standard Model ◽  
Total Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Mixing Effects ◽  
Model Predictions

The deviations from standard model predictions for the process e+e− → W+W− due to the inclusion of mixing between ordinary and mirror leptons are evaluated for (i) total cross section, (ii) forward-backward asymmetry and (iii) differential cross sections for the production of unpolarized/polarized W's at LEP II [Formula: see text] energy. For the presently known limits on mirror lepton mixings ( sin 2 ψ ≈ 0.02 to 0.06) and heavy mirror neutrinos (m N ≈ 100–300 GeV ), the relative deviations are large (∆ ≈ −2% to −20%). These could possibly allow discerning of mirror lepton mixing effects at LEP II.

Pair production by muons in the field of nuclei

1968 ◽  
Vol 46 (10) ◽  
pp. S387-S390 ◽  
Author(s):  
S. R. Kelner ◽  
Yu. D. Kotov
Keyword(s):  
Numerical Calculation ◽  
Differential Cross Section ◽  
Energy Loss ◽  
Pair Production ◽  
Cross Section ◽  
Differential Cross ◽  
Muon Energy ◽  
Fermi Model ◽  
Electron Pairs ◽  
Analytical Expressions

The differential cross section for the production of electron pairs by muons has been obtained under the assumption that all particles are relativistic and that the Thomas–Fermi model can be used to evaluate the effect of screening. Analytical expressions have been obtained for the energy loss of muons by pair production for the two extreme cases of "no screening" and "complete screening". Results of numerical calculation of energy loss by this process are given as a function of muon energy, for rock with Z = 11.

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