We present a model for dihadron fragmentation functions, describing the fragmentation of a quark into two unpolarized hadrons. We tune the parameters of our model to the output of the PYTHIA event generator for two-hadron semi-inclusive production in deep inelastic scattering at HERMES. Once the parameters of the model are fixed, we make predictions for other unknown fragmentation functions and...

The jet calibration of the Liquid-Argon-Calorimeter of the H1 Detector at HERA is described. In the measurement of high jet transverse energies systematic uncertainties as low as 2% can be reached in deep inelastic scattering with a high photon virtuality (Q) and in photoproduction. Furthermore, the concept of a new energy weighting scheme of H1 is presented. First applications with a high Q ne...

Charged particle production has been studied in deep inelastic scattering (DIS) using an integrated luminosity of about 0.44 fb−1 taken with the ZEUS detector at HERA. The fragmentation properties of the struck quark in deep inelastic scattering have been investigated in the current fragmentation region of the Breit frame as a function of the exchanged boson virtuality Q. The measured evolution...

In the framework of model motivated by perturbative calculations in QCD we estimate the differential and total cross sections for both the photoproduction of vector D *-mesons and their yield in deep inelastic scattering at the HERA collider. The offered model allows us to take into account higher twists over the transverse momentum of meson at p T ∼ m c and correctly to approach the dominance ...

Using some simple .ass.mptions, we present in this paper a calculation of the quark fragmentation functions seen in deep inelastic processes. The results provide evidence for the conjecture that both jets seen in high p1 reactions at the ISR stem from similar parents. The calculated functions are in excellent agreement with the inclusive distributions seen in vp and tp scattering,and in particu...

We propose a means of distinguishing between gluon-and quark-seeded systems that may in principle be measured in deep inelastic lepton scattering. As a particular application, we discuss those HERA data on deep inelastic ep scattering which contain a large rapidity gap in the final state. It is standard to interpret these events as being due to " pomeron " exchange, although precisely what is m...

A model for dihadron fragmentation functions is briefly outlined, that describes the fragmentation of a quark in two unpolarized hadrons. The parameters are tuned to the output of the PYTHIA event generator for two-hadron semi-inclusive production in deep inelastic scattering at HERMES. Then predictions are made for the unknown polarized fragmentation function and the related single-spin asymme...

It is shown that neutrino and antineutrino deep inelastic scattering of unpolarized and polarized Λ and Λ productions, can provide a clean separation of unpolarized and polarized fragmentation functions of a quark into a Λ, for both light-flavor quarks and antiquarks and also for strange quarks. Combining with Λ and Λ productions, in polarized electron deep inelastic scattering, one can systema...

We consider all hyperon data relevant to spin and flavor structure of hyperons. In addition to masses and magnetic moments considered as static properties in Hyperon99 we include also relevant data from hyperon decays and spin structure determined from deep inelastic scattering. Any theoretical model for the hyperons with parameters to be determined from experiment should use input from all the...

The trace anomaly is relevant to the renormalisation of the unpolarised parton distributions. The coefficient which describes the local γ∗(glue) interaction differs at next-to-leading order between the renormalised operator product expansion and parton model descriptions of deep inelastic scattering – independent of the factorisation scheme. There are two approaches to the theory of deep inelas...