Speaker
Elena Kokoulina
(Joint Institute for Nuclear Research)
Description
All available (up to 200 GeV) data on multiplicity in $e^+e^-$ annihilation are described well in the framework of two-stage model based on pQCD and suggested phenomenological scheme of hadronization. This model confirms increasing of number of splitting gluons with growth of energy and the fragmentation mechanism of hadronization in vacuum: single gluon $\rightarrow $ single hadron that corresponds to hypothesis of local parton-hadron duality. It can give estimations for mean multiplicity at 100-500 TeV.
Modification of this model for proton-proton and proton-antiproton interactions has been realised by inclusion of gluons which play active role in multi-particle production and they are the main sources of secondary particles. The valency quarks are staying at that in the leading particles. This model is called a gluon dominance model. It demonstrates very strong evidence of recombination mechanism of hadronization in hadron and nuclear interactions when formation of secondary particles at hadronization is realised in quark-gluon medium. In this case the mean multiplicity of hadrons formed from parton (gluon) grows with energy and it exceeds the corresponding values for lepton interactions. At the same time the region of high multiplicity is stipulated for active splitting of gluons.
For the first time measured at Nuclotron (JINR) soft photon yield at interactions of 3.5A GeV/c deuteron and lithium beams with carbon target confirms their excess in comparison with theoretical predictions. Estimations of region of their emission can lead to changing (increasing) of the generally accepted region of strong interactions.
Primary author
Elena Kokoulina
(Joint Institute for Nuclear Research)
