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Zeitschrift für Physik C
ISSN: 0170-9739 (printed version)
ISSN: 1431-5858 (electronic version)
Abstract Volume 74 Issue 3 (1997) pp 451-461
Inclusive production of neutral pions in hadronic Z decays
R. Barate et al.ALEPH Collaboration
Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, F-74019 Annecy-le-Vieux Cedex, France
Received: 22 November 1996
Abstract. A measurement of the inclusive production of $\pi^0$ mesons in hadronic Z decays is presented and compared to Monte Carlo model predictions. The analysis is based on approximately 2 million hadronic events recorded with the ALEPH detector at LEP at a centre-of-mass energy of $\sqrt{s} = 91.2~{\rm GeV}$. Neutral pions are reconstructed using photons measured in the electromagnetic calorimeter and photons from conversion pairs. The inclusive $\pi^0$ momentum spectrum is measured in the range $0.025 < x_{p} = p/p_{\mathrm{beam}} < 1$. In this range the number of $\pi^0$ per hadronic Z is found to be $4.80 \pm 0.07({\mathrm{stat}}) \pm 0.31({\mathrm{sys}})$. The differential inclusive $\pi^0$ cross section is also measured as a function of transverse momentum with respect to the event plane ($p^{\mathrm{in}}_{\mathrm{T}}$ and $p^{\mathrm{out}}_{\mathrm{T}}$).
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