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Multi-photon production in e+e− collisions at √s = 189 GeV

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Multi-photon production in e+e− collisions at √s = 189 GeV. / OPAL Collaboration.
In: Physics Letters B, Vol. 465, No. 1-4, 21.10.1999, p. 303-314.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

OPAL Collaboration 1999, 'Multi-photon production in e+e− collisions at √s = 189 GeV', Physics Letters B, vol. 465, no. 1-4, pp. 303-314. https://doi.org/10.1016/S0370-2693(99)01092-8

APA

OPAL Collaboration (1999). Multi-photon production in e+e− collisions at √s = 189 GeV. Physics Letters B, 465(1-4), 303-314. https://doi.org/10.1016/S0370-2693(99)01092-8

Vancouver

OPAL Collaboration. Multi-photon production in e+e− collisions at √s = 189 GeV. Physics Letters B. 1999 Oct 21;465(1-4):303-314. doi: 10.1016/S0370-2693(99)01092-8

Author

OPAL Collaboration. / Multi-photon production in e+e− collisions at √s = 189 GeV. In: Physics Letters B. 1999 ; Vol. 465, No. 1-4. pp. 303-314.

Bibtex

@article{16e8a78e8db640b89784dd5507281648,
title = "Multi-photon production in e+e− collisions at √s = 189 GeV",
abstract = "The process e+e−→γγ(γ) is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb−1. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Λ+> 304 GeV and Λ−> 295 GeV as well as a mass limit for an excited electron, Me* > 306 GeV assuming equal e*ey and eeγ couplings. Graviton exchange in the context of theories with higher dimensions is excluded for scales G+< 660 GeV and G−< 634 GeV. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons and produced in association with another photon.",
author = "Vakhtang Kartvelishvili and {OPAL Collaboration}",
year = "1999",
month = oct,
day = "21",
doi = "10.1016/S0370-2693(99)01092-8",
language = "English",
volume = "465",
pages = "303--314",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "ELSEVIER SCIENCE BV",
number = "1-4",

}

RIS

TY - JOUR

T1 - Multi-photon production in e+e− collisions at √s = 189 GeV

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 1999/10/21

Y1 - 1999/10/21

N2 - The process e+e−→γγ(γ) is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb−1. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Λ+> 304 GeV and Λ−> 295 GeV as well as a mass limit for an excited electron, Me* > 306 GeV assuming equal e*ey and eeγ couplings. Graviton exchange in the context of theories with higher dimensions is excluded for scales G+< 660 GeV and G−< 634 GeV. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons and produced in association with another photon.

AB - The process e+e−→γγ(γ) is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb−1. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Λ+> 304 GeV and Λ−> 295 GeV as well as a mass limit for an excited electron, Me* > 306 GeV assuming equal e*ey and eeγ couplings. Graviton exchange in the context of theories with higher dimensions is excluded for scales G+< 660 GeV and G−< 634 GeV. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons and produced in association with another photon.

U2 - 10.1016/S0370-2693(99)01092-8

DO - 10.1016/S0370-2693(99)01092-8

M3 - Journal article

VL - 465

SP - 303

EP - 314

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

IS - 1-4

ER -