Measurement of the Differential Cross-sections of $e^+ e^- \to \gamma \gamma$ and $e^+ e^- \to \gamma \gamma \gamma$ at $\sqrt{s}=55$-{GeV}, 56-{GeV}, 56.5-{GeV} and 57-{GeV} and Search for Unstable Photino Pair Production

Abe, K.; Amako, K.; Arai, Y.; Fukawa, M.; Fukushima, Y.; Ishihara, N.; Haidt, D.; Kanzaki, J.; Kondo, T.; Matsui, T.

doi:10.1007/BF01674449

Measurement of the Differential Cross-sections of $e^+ e^- \to \gamma \gamma$ and $e^+ e^- \to \gamma \gamma \gamma$ at $\sqrt{s}=55$ -{GeV}, 56-{GeV}, 56.5-{GeV} and 57-{GeV} and Search for Unstable Photino Pair Production

VENUS

Collaboration

Aug, 1989

35 pages

Published in:

Z.Phys.C 45 (1989) 175

DOI:

10.1007/BF01674449

Report number:

KEK-Preprint-89-66,
OULNS-89-06,
KOBE-HEP-89-03,
HUPD-8909,
KUNS-982,
TMUP-HEL-89-20

Experiments:

KEK-TE-001,
KEK-VENUS

datasets

reference search39 citations

Citations per year

Abstract: (Springer)

Differential cross sections fore+e−→γγ have been measured at center-of-mass energies of 55, 56, 56.5 and 57 GeV. The results are in good agreement with those predicted by QED. Possible deviations from QED are studied in terms of contact interactions, and the limits on compositeness scales are obtained. Using events with a gramma pair in the final state, a search is made for the pair production of unstable photons,

e^ +e^ -\to \tilde \gamma\tilde \gamma

. No candidate events were found and a new limit on the photino mass is obtained.

electron positron: colliding beams
electron positron: annihilation
photon: electroproduction
final state: two-photon
final state: (3photon)
quantum electrodynamics: validity test
model: composite
e*
postulated particle: photino
photino: pair production

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Measurement of the Differential Cross-sections of e+e−→γγe^+ e^- \to \gamma \gammae+e−→γγ and e+e−→γγγe^+ e^- \to \gamma \gamma \gammae+e−→γγγ at s=55\sqrt{s}=55s​=55-{GeV}, 56-{GeV}, 56.5-{GeV} and 57-{GeV} and Search for Unstable Photino Pair Production

Citations per year

Measurement of the Differential Cross-sections of $e^+ e^- \to \gamma \gamma$ and $e^+ e^- \to \gamma \gamma \gamma$ at $\sqrt{s}=55$ -{GeV}, 56-{GeV}, 56.5-{GeV} and 57-{GeV} and Search for Unstable Photino Pair Production