TY - JOUR

T1 - Search for trilinear neutral gauge boson couplings in Zγ production at √s=189 GeV at LEP

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 2000/12

Y1 - 2000/12

N2 - The data recorded at a centre-of-mass energy of √s=189 GeV by the OPAL detector at LEP are used to search for trilinear couplings of the neutral gauge bosons in the process e+e−→Zγ. The cross-sections for multihadronic events with an energetic isolated photon, and for events with a high energy photon accompanied by missing energy are measured. These cross-sections and the photon energy, polar angle and isolation angle distributions are compared to the Standard Model predictions and to the theoretical expectations of a model allowing for ZγZ and Zγγ vertices. Since no significant deviations with respect to the Standard Model expectations are found, constraints are derived on the strength of neutral trilinear gauge couplings.

AB - The data recorded at a centre-of-mass energy of √s=189 GeV by the OPAL detector at LEP are used to search for trilinear couplings of the neutral gauge bosons in the process e+e−→Zγ. The cross-sections for multihadronic events with an energetic isolated photon, and for events with a high energy photon accompanied by missing energy are measured. These cross-sections and the photon energy, polar angle and isolation angle distributions are compared to the Standard Model predictions and to the theoretical expectations of a model allowing for ZγZ and Zγγ vertices. Since no significant deviations with respect to the Standard Model expectations are found, constraints are derived on the strength of neutral trilinear gauge couplings.

U2 - 10.1007/s100520000490

DO - 10.1007/s100520000490

M3 - Journal article

VL - 17

SP - 553

EP - 566

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 4

ER -