Abstract:We present new sets of fragmentation functions for neutral kaons, both at leading and next-to-leading order. They are fitted to data on inclusive K 0 production in e + e − annihilation taken by MARK II at PEP ( √ s = 29 GeV) and by ALEPH at LEP. Our fragmentation functions lead to a good description of other e + e − data on inclusive K 0 production at various energies. They also nicely agree with the K 0 S transverse-momentum spectra measured by H1 at the DESY ep collider HERA, by UA5 at the CERN SppS Collider… Show more
“…In principle, the flavor structure of the kaon fragmentation functions is more complicated than that of the pion, as revealed by the FieldFeynman model. However, some available parametrizations [10][11][12][13] usually make only distinction between the favored fragmentation functions, which are related to the valence quarks of the kaon, and the unfavored fragmentation functions, which are related to the light-flavor sea quarks of the kaon. parameters used in this work can be also constrained by further detailed studies, or the framework should be extended to more general situation with more sophisticated aspects taken into account.…”
Section: The Fragmentation Functions Of the Kaonmentioning
. This work gives a significant modification of the original model, and the predictions can be tested by future experiments on the fragmentation functions of the kaon.
“…In principle, the flavor structure of the kaon fragmentation functions is more complicated than that of the pion, as revealed by the FieldFeynman model. However, some available parametrizations [10][11][12][13] usually make only distinction between the favored fragmentation functions, which are related to the valence quarks of the kaon, and the unfavored fragmentation functions, which are related to the light-flavor sea quarks of the kaon. parameters used in this work can be also constrained by further detailed studies, or the framework should be extended to more general situation with more sophisticated aspects taken into account.…”
Section: The Fragmentation Functions Of the Kaonmentioning
. This work gives a significant modification of the original model, and the predictions can be tested by future experiments on the fragmentation functions of the kaon.
“…The authors of [6] calculate the inclusive single-particle photoproduction cross sections as follows. The hard subprocess is calculated to next-to-leading order in QCD, as is the evolution of the fragmentation and parton distribution functions.…”
Section: Models Of Photoproductionmentioning
confidence: 99%
“…Recent next-to-leading order QCD calculations of inclusive particle spectra in ep scattering use fragmentation functions which have been fitted to e + e − data [6]. These NLO calculations involve four scales: the factorization scales connected with the parton densities of the photon and the proton, the factorization scale of the fragmentation functions and the renormalization scale of the QCD coupling constant.…”
Section: Comparison With Models and Calculationsmentioning
confidence: 99%
“…This arbitrariness in the choice of the scales introduces a change in the predicted cross sections and is a measure of the contribution of higher-order terms. To reduce the scale influence, the calculation for the photoproduction of neutral kaons was restricted to transverse K 0 momenta p t > 1 GeV, although the theoretical predictions should be more reliable for transverse momenta above 3 GeV [6]. A comparison of data with this calculation is shown in Fig.…”
Section: Comparison With Models and Calculationsmentioning
confidence: 99%
“…The process dependence of particle production rates is studied by comparing the rates of strangeness production in γp and in pp. Finally, results from next-to-leading order (NLO) QCD calculations [6] and from Pythia [7,2] are compared with the measurements.…”
Inclusive K 0 and Λ photoproduction has been investigated at HERA with the H1 detector at an average photon-proton center of mass energy of 200 GeV in the transverse momentum range 0.5 < p t < 5 GeV. The production rates as a function of p t and center of mass rapidity are compared to those obtained in deep inelastic scattering at Q 2 = 23 GeV 2 . A similar comparison is made of the rapidity spectra of charged particles. The rate of strangeness photoproduction is compared with pp measurements. The observations are also compared with next-to-leading order QCD calculations and the predictions of a Monte Carlo model.
The production of charged hadrons and K 0 S mesons in the collisions of quasi-real photons has been measured using the OPAL detector at LEP. The data were taken at e + e − centre-of-mass energies of 161 and 172 GeV. The differential cross-sections as a function of the transverse momentum and the pseudorapidity of the charged hadrons and K 0 S mesons have been compared to the leading order Monte Carlo simulations of PHOJET and PYTHIA and to perturbative next-to-leading order (NLO) QCD calculations. The distributions have been measured in the range 10 < W < 125 GeV of the hadronic invariant mass W . By comparing the transverse momentum distribution of charged hadrons measured in γγ interactions with γ-proton and meson-proton data we find evidence for hard photon interactions in addition to the purely hadronic photon interactions.
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