Scaled Momentum Distributions for K^0_s and Lambda/anti-Lambda in DIS at HERAстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Scaled momentum distributions for the strange hadrons K0
S and Λ/¯Λwere measured
in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated
luminosity of 330 pb−1. The evolution of these distributions with the photon virtuality,
Q2, was studied in the kinematic region 10 < Q2 < 40000 GeV2 and 0.001 < x < 0.75,
where x is the Bjorken scaling variable. Clear scaling violations are observed. Predictions
based on different approaches to fragmentation were compared to the measurements.
Leading-logarithm parton-shower Monte Carlo calculations interfaced to the Lund string
fragmentation model describe the data reasonably well in the whole range measured. Nextto-
leading-order QCD calculations based on fragmentation functions, FFs, extracted from
e+e− data alone, fail to describe the measurements. The calculations based on FFs extracted
from a global analysis including e+e−, ep and pp data give an improved description.
The measurements presented in this paper have the potential to further constrain the FFs
of quarks, anti-quarks and gluons yielding K0
S and Λ/¯Λ strange hadrons.