Probing anomalous γγγZ couplings through γZ production in γγ collisions at the CLIC

Abstract We have estimated the sensitivity to the anomalous couplings of the γγγZ vertex in the γγ → γZ scattering of the Compton backscattered photons at the CLIC. Both polarized and unpolarized collisions at the e+e− energies 1500 GeV and 3000 GeV are addressed, and anomalous contributions to helicity amplitudes are derived. The differential and total cross sections are calculated. We have obtained 95% C.L. exclusion limits on the anomalous quartic gauge couplings (QGCs). They are compared with corresponding bounds derived for the γγγZ couplings via γZ production at the LHC. The constraints on the anomalous QGCs are one to two orders of magnitude more stringent that at the HL-LHC. The partial-wave unitarity constraints on the anomalous couplings are examined. It is shown that the unitarity is not violated in the region of the anomalous QGCs studied in the paper.

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Single-top and top-antitop cross sections

EPJ Web of Conferences ◽

10.1051/epjconf/201819200004 ◽

2018 ◽

Vol 192 ◽

pp. 00004

Author(s):

Nikolaos Kidonakis

Keyword(s):

Cross Sections ◽

Top Quark ◽

Production Cross ◽

Anomalous Couplings ◽

Total Cross Sections ◽

Associated Production ◽

Single Top ◽

The Standard Model ◽

Rapidity Distributions ◽

Quark Transverse Momentum

I present high-order calculations, including soft-gluon corrections, for single-top and top-antitop production cross sections and differential distributions. For single-top production, results are presented for the three different channels in the Standard Model, for associated production with a charged Higgs, and for processes involving anomalous couplings. For top-antitop pair production, total cross sections and top-quark transverse-momentum and rapidity distributions are presented for various LHC energies.

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NONSTANDARD MODEL COUPLINGS IN WWV VERTEX

International Journal of Modern Physics A ◽

10.1142/s0217751x9400114x ◽

1994 ◽

Vol 09 (16) ◽

pp. 2783-2804

Author(s):

A.M. HARUN AR RASHID ◽

KH. SAIFUL ISLAM

Keyword(s):

Cross Sections ◽

Differential Cross ◽

Differential Cross Sections ◽

Similar Calculation ◽

Total Cross Sections ◽

Nonstandard Model ◽

Helicity Amplitudes

Using the nonstandard model vertex for WWV coupling, the helicity amplitudes, differential cross-sections and total cross-sections for the process e+e−→W+W− as functions of κV and λV have been calculated, and compared with SM predictions. A similar calculation has also been done for the process eγ→Wνe.

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Analysis of STEM micrographs of thick objects

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100081395 ◽

1978 ◽

Vol 36 (2) ◽

pp. 106-107

Author(s):

S. Golladay

Keyword(s):

Inelastic Scattering ◽

Multiple Scattering ◽

Mass Distribution ◽

Cross Sections ◽

Phase Contrast ◽

Image Point ◽

Contrast Effects ◽

Total Cross Sections ◽

Elastic And Inelastic Scattering

The theory of multiple scattering has been worked out by Groves and comparisons have been made between predicted and observed signals for thick specimens observed in a STEM under conditions where phase contrast effects are unimportant. Independent measurements of the collection efficiencies of the two STEM detectors, calculations of the ratio σe/σi = R, where σe, σi are the total cross sections for elastic and inelastic scattering respectively, and a model of the unknown mass distribution are needed for these comparisons. In this paper an extension of this work will be described which allows the determination of the required efficiencies, R, and the unknown mass distribution from the data without additional measurements or models. Essential to the analysis is the fact that in a STEM two or more signal measurements can be made simultaneously at each image point.

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Production Cross Sections of Fragments from Beams of 400–650 MeV per Nucleon9Be,11B,12C,14N,15N,16O,20Ne,22Ne,56Fe, and58Ni Nuclei Interacting in a Liquid Hydrogen Target. I. Charge Changing and Total Cross Sections

The Astrophysical Journal ◽

10.1086/306445 ◽

1998 ◽

Vol 508 (2) ◽

pp. 940-948 ◽

Cited By ~ 34

Author(s):

W. R. Webber ◽

J. C. Kish ◽

J. M. Rockstroh ◽

Y. Cassagnou ◽

R. Legrain ◽

...

Keyword(s):

Cross Sections ◽

Production Cross ◽

Liquid Hydrogen ◽

Liquid Hydrogen Target ◽

Hydrogen Target ◽

Total Cross Sections

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Total cross sections of eγ → $$ eX\overline{X} $$ processes with X = μ, γ, e via multiloop methods

Journal of High Energy Physics ◽

10.1007/jhep01(2021)144 ◽

2021 ◽

Vol 2021 (1) ◽

Author(s):

Roman N. Lee ◽

Alexey A. Lyubyakin ◽

Vyacheslav A. Stotsky

Keyword(s):

Cross Section ◽

Cross Sections ◽

Elliptic Integral ◽

High Energy ◽

Calculation Methods ◽

Complete Elliptic Integral ◽

Total Cross Sections ◽

Multiloop Calculation ◽

The Cross ◽

Analytical Expressions

Abstract Using modern multiloop calculation methods, we derive the analytical expressions for the total cross sections of the processes e−γ →$$ {e}^{-}X\overline{X} $$ e − X X ¯ with X = μ, γ or e at arbitrary energies. For the first two processes our results are expressed via classical polylogarithms. The cross section of e−γ → e−e−e+ is represented as a one-fold integral of complete elliptic integral K and logarithms. Using our results, we calculate the threshold and high-energy asymptotics and compare them with available results.

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