Evidence for an Excess of Soft Photons in Hadronic Decays of Z^0

Details Evidence for an Excess of Soft Photons in Hadronic Decays of Z^0 Evidence for an Excess of Soft Photons in Hadronic Decays of Z^0

2006-04-19

arxiv.org/abs/hep-ex/0604038v1

Eur.Phys.J.C47:273-294,2006

Physics

High Energy Physics

High Energy Physics - Experiment

37 pages, 9 figures, Accepted by Eur. Phys. J. C

Scientific paper

10.1140/epjc/s2006-02568-8

Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qqbar disintegrations of the Z^0 were studied in the kinematic range 0.2 < E_gamma < 1 GeV and transverse momentum with respect to the closest jet direction p_T < 80 MeV/c. A clear excess of photons in the experimental data as compared to the Monte Carlo predictions is observed. This excess (uncorrected for the photon detection efficiency) is (1.17 +/- 0.06 +/- 0.27) x 10^{-3} gamma/jet in the specified kinematic region, while the expected level of the inner hadronic bremsstrahlung (which is not included in the Monte Carlo) is (0.340 +/- 0.001 +/- 0.038) x 10^{-3} gamma/jet. The ratio of the excess to the predicted bremsstrahlung rate is then (3.4 +/- 0.2 +/- 0.8), which is similar in strength to the anomalous soft photon signal observed in fixed target experiments with hadronic beams.

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