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Improving the equivalent-photon approximation in electron-positron collisions

The validity of the equivalent-photon approximation for two-photon processes in electron--positron collisions is critically examined. Commonly used forms to describe hadronic two-photon production are shown to lead to sizeable errors. An improved two-photon luminosity function is presented, which in...

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Autor principal: Schuler, Gerhard A.
Lenguaje:eng
Publicado: 1996
Materias:
Acceso en línea:http://cds.cern.ch/record/313208
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author Schuler, Gerhard A.
author_facet Schuler, Gerhard A.
author_sort Schuler, Gerhard A.
collection CERN
description The validity of the equivalent-photon approximation for two-photon processes in electron--positron collisions is critically examined. Commonly used forms to describe hadronic two-photon production are shown to lead to sizeable errors. An improved two-photon luminosity function is presented, which includes beyond-leading-logarithmic effects and scalar-photon contributions. Comparisons of various approximate expressions with the exact calculation in the case of the total hadronic cross section are given. Furthermore, effects of the poorly known low-Q2 behaviour of the virtual hadronic cross sections are discussed.
id cern-313208
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1996
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spelling cern-3132082023-03-12T05:57:15Zhttp://cds.cern.ch/record/313208engSchuler, Gerhard A.Improving the equivalent-photon approximation in electron-positron collisionsParticle Physics - PhenomenologyThe validity of the equivalent-photon approximation for two-photon processes in electron--positron collisions is critically examined. Commonly used forms to describe hadronic two-photon production are shown to lead to sizeable errors. An improved two-photon luminosity function is presented, which includes beyond-leading-logarithmic effects and scalar-photon contributions. Comparisons of various approximate expressions with the exact calculation in the case of the total hadronic cross section are given. Furthermore, effects of the poorly known low-Q2 behaviour of the virtual hadronic cross sections are discussed.The validity of the equivalent-photon approximation for two-photon processes in electron--positron collisions is critically examined. Commonly used forms to describe hadronic two-photon production are shown to lead to sizeable errors. An improved two-photon luminosity function is presented, which includes beyond-leading-logarithmic effects and scalar-photon contributions. Comparisons of various approximate expressions with the exact calculation in the case of the total hadronic cross section are given. Furthermore, effects of the poorly known low-Q2 behaviour of the virtual hadronic cross sections are discussed.hep-ph/9610406CERN-TH-96-297CERN-TH-96-297oai:cds.cern.ch:3132081996-10-18
spellingShingle Particle Physics - Phenomenology
Schuler, Gerhard A.
Improving the equivalent-photon approximation in electron-positron collisions
title Improving the equivalent-photon approximation in electron-positron collisions
title_full Improving the equivalent-photon approximation in electron-positron collisions
title_fullStr Improving the equivalent-photon approximation in electron-positron collisions
title_full_unstemmed Improving the equivalent-photon approximation in electron-positron collisions
title_short Improving the equivalent-photon approximation in electron-positron collisions
title_sort improving the equivalent-photon approximation in electron-positron collisions
topic Particle Physics - Phenomenology
url http://cds.cern.ch/record/313208
work_keys_str_mv AT schulergerharda improvingtheequivalentphotonapproximationinelectronpositroncollisions