Abstract
A measurement of the inclusive production of π0 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 ⊡s = 91.2 GeV. Neutral pions are reconstructed using photons measured in the electromagnetic calorimeter and photons from conversion pairs. The inclusive π0 momentum spectrum is measured in the range 0.025 < x p = p/p beam < 1. In this range the number of π0 per hadronic Z is found to be 4.80 ± 0.07(stat) ± 0.31(sys). The differential inclusive π0 cross section is also measured as a function of transverse momentum with respect to the event plane (p inT and p outT ).
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Work supported in part by Ministero dell’ Università e della Ricerca Scientifica
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OPAL Collaboration. Inclusive production of neutral pions in hadronic Z decays. Z Phys C - Particles and Fields 74, 451–462 (1997). https://doi.org/10.1007/s002880050407
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DOI: https://doi.org/10.1007/s002880050407