Precision measurement of charged pion and kaon differential cross sections in electron-positron annihilation at Q = 10.52 GeV

TL;DR

This paper reports precise measurements of charged pion and kaon production cross sections in electron-positron annihilation at 10.52 GeV, providing new data on hadronization processes at energies below the Z resonance.

Contribution

It presents the first measurements of the z-dependence of pion and kaon production for z > 0.7 at this energy, with high precision and systematic uncertainty analysis.

Findings

First measurements of z > 0.7 hadron production cross sections.

High-precision differential cross sections with 4-15% uncertainties.

Data useful for testing QCD fragmentation models.

Abstract

Measurements of inclusive differential cross sections for charged pion and kaon production in electron-positron annihilation have been carried out at a center-of-mass energy of Q = 10.52 GeV. The measurements were performed with the Belle detector at the KEKB electron-positron collider using a data sample containing 113 million e+e- -> qqbar events, where q={u,d,s,c}. We present charge-integrated differential cross sections d\sigma_h+-/dz for h+- = pi+-, K+- as a function of the relative hadron energy z = 2*E_h / sqrt{s} from 0.2 to 0.98. The combined statistical and systematic uncertainties for pi+- (K+-) are 4% (4%) at z ~ 0.6 and 15% (24%) at z ~ 0.9. The cross sections are the first measurements of the z-dependence of pion and kaon production for z > 0.7 as well as the first precision cross section measurements at a center-of-mass energy far below the Z^0 resonance used by the experiments at LEP and SLC.