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Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV

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

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Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV. / OPAL Collaboration.
In: European Physical Journal C: Particles and Fields, Vol. 8, No. 1, 03.1999, p. 23-40.

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

Harvard

OPAL Collaboration 1999, 'Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV', European Physical Journal C: Particles and Fields, vol. 8, no. 1, pp. 23-40. https://doi.org/10.1007/s100529901083

APA

OPAL Collaboration (1999). Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV. European Physical Journal C: Particles and Fields, 8(1), 23-40. https://doi.org/10.1007/s100529901083

Vancouver

OPAL Collaboration. Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV. European Physical Journal C: Particles and Fields. 1999 Mar;8(1):23-40. doi: 10.1007/s100529901083

Author

OPAL Collaboration. / Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV. In: European Physical Journal C: Particles and Fields. 1999 ; Vol. 8, No. 1. pp. 23-40.

Bibtex

@article{6783945b749b4164ad9a38311835bba9,
title = "Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV",
abstract = "Photonic events with large missing energy have been observed in e+e−e+e− collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectations from the Standard Model process e+e−→νν¯¯¯e+e−→νν¯ + photon(s). No evidence is observed for new physics contributions to these final states. Using the data at s√s = 183 GeV, upper limits on σ(e+e−→XY)⋅BR(X→Yγ)σ(e+e−→XY)⋅BR(X→Yγ) and σ(e+e−→XX)⋅BR2(X→Yγ)σ(e+e−→XX)⋅BR2(X→Yγ) are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos (X=ν∗,Y=νX=ν∗,Y=ν), to neutralino production (X=χ~02,Y=χ~01X=χ~02,Y=χ~01) and to supersymmetric models in which X=χ~01X=χ~01 and Y=G~Y=G~ is a light gravitino.",
author = "Vakhtang Kartvelishvili and {OPAL Collaboration}",
year = "1999",
month = mar,
doi = "10.1007/s100529901083",
language = "English",
volume = "8",
pages = "23--40",
journal = "European Physical Journal C: Particles and Fields",
issn = "1434-6044",
publisher = "SPRINGER",
number = "1",

}

RIS

TY - JOUR

T1 - Search for anomalous photonic events with missing energy in e+e− collisions at √s = 130, 136 and 183 GeV

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 1999/3

Y1 - 1999/3

N2 - Photonic events with large missing energy have been observed in e+e−e+e− collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectations from the Standard Model process e+e−→νν¯¯¯e+e−→νν¯ + photon(s). No evidence is observed for new physics contributions to these final states. Using the data at s√s = 183 GeV, upper limits on σ(e+e−→XY)⋅BR(X→Yγ)σ(e+e−→XY)⋅BR(X→Yγ) and σ(e+e−→XX)⋅BR2(X→Yγ)σ(e+e−→XX)⋅BR2(X→Yγ) are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos (X=ν∗,Y=νX=ν∗,Y=ν), to neutralino production (X=χ~02,Y=χ~01X=χ~02,Y=χ~01) and to supersymmetric models in which X=χ~01X=χ~01 and Y=G~Y=G~ is a light gravitino.

AB - Photonic events with large missing energy have been observed in e+e−e+e− collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectations from the Standard Model process e+e−→νν¯¯¯e+e−→νν¯ + photon(s). No evidence is observed for new physics contributions to these final states. Using the data at s√s = 183 GeV, upper limits on σ(e+e−→XY)⋅BR(X→Yγ)σ(e+e−→XY)⋅BR(X→Yγ) and σ(e+e−→XX)⋅BR2(X→Yγ)σ(e+e−→XX)⋅BR2(X→Yγ) are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos (X=ν∗,Y=νX=ν∗,Y=ν), to neutralino production (X=χ~02,Y=χ~01X=χ~02,Y=χ~01) and to supersymmetric models in which X=χ~01X=χ~01 and Y=G~Y=G~ is a light gravitino.

U2 - 10.1007/s100529901083

DO - 10.1007/s100529901083

M3 - Journal article

VL - 8

SP - 23

EP - 40

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 1

ER -