# Search for anomalous production of single photons at $\sqrt{s}$ = 130 and 136 GeV

Abstract : This letter reports the results of the measurement of single photon production in the reaction $e^+e^- \rightarrow \gamma +$ invisible particles at centre-of-mass energies $\sqrt{s}=$~130 and 136 GeV and an integrated luminosity of 5.83~pb$^{-1}$, collected with the DELPHI detector at LEP. %No anomalous signal has been observed. The contribution from The signal is compatible with the prediction of the Standard Model for the process $e^+e^- \rightarrow \nu \bar{\nu}\gamma$, and the number of neutrino families has been determined to be $N_{\nu}=3.1 \pm 0.6$. Limits have been derived on anomalous neutral gauge boson couplings and on compositeness in the framework of a specific model.
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Submitted on : Monday, February 15, 1999 - 9:55:09 AM
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### Citation

W. Adam, T. Adye, E. Agasi, I. Ajinenko, R. Aleksan, et al.. Search for anomalous production of single photons at $\sqrt{s}$ = 130 and 136 GeV. Physics Letters B, Elsevier, 1996, 380, pp.471-479. ⟨10.1016/0370-2693(96)00671-5⟩. ⟨in2p3-00005079⟩

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