Probabilistic quark-model approach to proton fragmentation
نویسندگان
چکیده
منابع مشابه
Recursive Fragmentation Model with Quark Spin. Application to Quark Polarimetry
An elementary recursive model accounting for the quark spin in the fragmentation of a quark into mesons is presented. The quark spin degree of freedom is represented by a two-components spinor. Spin one meson can be included. The model produces Collins effect and jet handedness. The influence of the initial quark polarisation decays exponentially with the rank of the meson, at different rates f...
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We calculate the exact fragmentation functions for c and b quark fragmentation taking into account the spin orientation of the initial heavy quark in the form of analytical and rather simple expressions. Our calculations show that spin orientation may have an important effect on the fragmentation spectrum. This effect is more striking in the cases of c ?D, D*; c? ? , ? , and ?B , B *.
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In the framework of the nonrelativistic QCD and a quark-diquark model of baryons we have obtained the fragmentation functions for heavy quark to split into spin-1/2 and spin-3/2 double heavy baryons. It was predicted the production rates as well as the shape of the energy spectra for the cc− and bc−baryons in the region of Zo peak at LEP collider.
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The alternative to the standard formulation of the quark-parton model is proposed. Our approach is based on the solution of the master equations relating the structure and distribution functions, which consistently takes into account the intrinsic quark motion in contradistinction to the standard infinite momentum approach, in which this motion is latently suppressed. The model well reproduces ...
متن کاملHeavy Quark Fragmentation to Polarised Quarkonium
We calculate the polarisation of $‘s and T’s produced by the fragmentation of heavy quarks. We find that fragmentation to transversely al igned quarkonium is very slightly enhanced relative to longitudinally polarised. This net al ignment corresponds to a 5% asymmetry in the angular distribution of leptons produced in the subsequent decay of the quarkonium. We point out that the leading gluon _...
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ژورنال
عنوان ژورنال: Zeitschrift f�r Physik C Particles and Fields
سال: 1979
ISSN: 0170-9739,1434-6052
DOI: 10.1007/bf01546241