Inclusive pi0 and K0s in gamma-gamma at L3

TL;DR

This paper reports on measurements of inclusive pi0 and K0s production in gamma-gamma collisions at LEP, comparing experimental data with QCD predictions to improve understanding of hadron production mechanisms.

Contribution

It provides the first detailed differential cross section measurements of pi0 and K0s in gamma-gamma interactions at LEP energies, including comparisons with theoretical models.

Findings

Exponential pt-dependence observed for pt ≤ 1 GeV.

Data agree with NLO QCD for pt > 1 GeV.

Differential cross sections measured across various eta and pt ranges.

Abstract

The ee -> ee+pi0+X and ee -> ee+K0s+X reactions are studied at LEP using data collected with the L3 detector at sqrt{s}=189-202 GeV. Preliminary results for the differential cross section dsigma/dpt in the transverse momentum range 0.2 GeV < pt < 7.5 GeV at central values of pseudo-rapidity, |eta| < 0.5 or |eta| < 1.5, and the differential cross section dsigma/d|eta| for different values of pt are presented. For pt le 1 GeV, the pt -dependence of the data are well described by an exponential fit. For pt > 1 GeV the cross sections are compared to NLO QCD calculations and to LO Monte Carlo predictions.