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Achard, P.; Adriani, O.; Aguilar-Benitez, M.; Alcaraz, J.; Alemanni, G.; Allaby, J.; Aloisio, A.; Alviggi, M G.; Anderhub, H.; Andreev, V P.; Anselmo, F.; Arefev, A.; Azemoon, T.; Aziz, T.; Baarmand, M.; Bagnaia, P.; Bajo, A.; Baksay, G.; Baksay, L.; Baldew, S V.; Banerjee, S.; Banerjee, Sw; Barczyk, A.; Barillere, R.; Bartalini, P.; Basile, M.; Batalova, N.; Battiston, R.; Bay, A.; Becattini, F.; Becker, U.; Behner, F.; Bellucci, L.; Berbeco, R.; Berdugo, J.; Berges, P.; Bertucci, B.; Betev, B L.; Biasini, M.; Biglietti, M.; Biland, A.; Blaising, J J.; Blyth, S C.; Bobbink, G J.; Boehm, A.; Boldizsar, L.; Borgia, B.; Bottai, S.; Bourilkov, D.; Bourquin, M.; Braccini, S.; Branson, J G.; Brochu, F.; Buijs, A.; Burger, J D.; Burger, W J.; Cai, X D.; Capell, M.; Cara Romeo, G.; Carlino, G.; Cartacci, A.; Casaus, J.; Cavallari, F.; Cavallo, N.; Cecchi, C.; Cerrada, M.; Chamizo-Llatas, M.; Chang, y H.; Chemarin, M.; Chen, A.; Chen, G.; Chen, G M.; Chen, H F.; Chen, H S.; Chiefari, G.; Cifarelli, L.; Cindolo, F.; Clare, I.; Clare, R.; Coignet, G.; Colino, N.; Costantini, S.; de La Cruz, B.; Cucciarelli, S.; van Dalen, J A.; de Asmundis, R.; Deglon, P.; Debreczeni, J.; Degre, A.; Deiters, K.; Della Volpe, D.; Delmeire, E.; Denes, P.; de Notaristefani, F.; de Salvo, A.; Diemoz, M.; Dierckxsens, M.; van Dierendonck, D N.; Dionisi, C.; Dittmar, M.
Physics letters. B, 2002, Letnik: 524Journal Article
The reactions $e^+e^- \to e^+e^-\pi^0$ X and $e^+e^- \to e^+e^-K^0_S$ X are studied using data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 202 GeV. Inclusive differential cross sections are measured as a function of the particle transverse momentum pt and the pseudo-rapidity. For $p_t \le 1.5$ GeV, the $\pi^0$ and $K^0_s$ differential cross sections are described by an exponential, typical of soft hadronic processes. For $p_t \ge 1.5$ GeV, the cross sections show the presence of perturbative QCD processes, described by a power-law. The data are compared to Monte Carlo predictions and to NLO QCD calculations. \end{document}
