Determination of the e+ e- ---> gamma gamma (gamma) cross-section at LEP 2 - INSPIRE

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Determination of the e+ e- ---> gamma gamma (gamma) cross-section at LEP 2

DELPHI

Collaboration

Apr, 2004

24 pages

Published in:

Eur.Phys.J.C 37 (2004) 405-419

e-Print:

hep-ex/0409058 [hep-ex]

DOI:

10.1140/epjc/s2004-01990-2

PDG: Limits for Excited

{{\mathit e}}

{{\mathit e}^{*}}

{{\mathit e}^{+}}

{{\mathit e}^{-}}

\rightarrow

{{\mathit \gamma}}{{\mathit \gamma}}

Report number:

CERN-PH-EP-2004-017

Experiments:

CERN-LEP-DELPHI

View in:

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Abstract:

A test of the benchmark QED process e+e- -> gamma gamma (gamma) is reported, using the data collected with the DELPHI detector at LEP 2. The data analysed were recorded at centre-of-mass energies ranging from 161 GeV to 208 GeV and correspond to a total integrated luminosity of 656.4 pb^{-1}. The Born cross-section for the process e+e- -> gamma gamma (gamma) was determined, confirming the validity of QED at the highest energies ever attained in electron-positron collisions. Lower limits on the parameters of a number of possible deviations from QED, predicted within theoretical frameworks expressing physics beyond the Standard Model, were derived.

Note:

24 pages, 5 figures, Accepted by Eur. Phys. J. C Report-no: CERN-PH-EP/2004-017 Journal-ref: Eur. Phys. J. C37 (2004) 405-419 DOI: 10.1140/epjc/s2004-01990-2

electron positron: colliding beams
electron positron: annihilation
photon: pair production
photon: multiple production
differential cross section: angular dependence
cross section: energy dependence
Born approximation
quantum electrodynamics: validity test
new interaction: four-fermion interaction
e*

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Figures(0)

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