MULTIPARTICLE DYNAMICS STUDY by GLUON DOMINANCE MODEL. Kokoulina E ., Nikitin V. GSTU, Belarus & JINR,Dubna. The unified approach to multiplicity distribution (MD) description in high energy interactions:. - annihilation,. Proton (nucleus) collisions. Proton-antiproton- annihilation.
Kokoulina E., Nikitin V.
GSTU, Belarus & JINR,Dubna
The unified approach to multiplicity distribution (MD) description in high energy interactions:
Proton (nucleus) collisions
The region of high multiplicity (HM): n >> n(s) – mean muliplicity. Pn - multiplicity distribution (MD), Q(s,z) - generating function (GF) Q(s,z)= S Pn (s) z .
Kuvshinov V. and Kokoulina E. Acta Phys.Polon.B13(1982) 533.
a) gluon fission; b) quark bremsstrahlung; c) quark pair creation.
K.Konishi et.al.NPB157(1979)45 A.Giovannini.NPB161(1979)429.
Convolution: of two stages
quark fission -> NBD
Pn in -annihilation at 14, 50, 91.4, 172 and 189 GeV; H(q) at 91.4 GeV.
E. Kokoulina. Minsk, NPCS (2002)[hep-ph/0209334]; ISMD32,2002.
maximal (mean) multiplicity of hadrons are formed from gluon on the stage of hadronization.
hadronization of gluon are softer than quark.
Project“THERMALIZATION” (JINR , IHEP, SINP MSU, GGTU)
The study of MP at pp (pA) interactions in HM region: nch>20-30.
Our model investigations had shown :quarks of initial protons are staying in leading particles (from 70 to 800 GeV/c).Multiparticle production (MP) is realizedby gluons. We name them active.
P.Carruthers about a passive role quarks:“…labels and sources of colour perturbation in the vacuum: meanwhile the gluons dominates in collisions and multiparticle production.”(1984)
The domination of gluons was first proposed by S.Pokorski and L.Van Hove (1975).
Model with the gluon branch in QGS – branch model (TSMB)
Model without the gluon branch –
Thermodynamic model (TSMT)
E.Kokoulina, V.Nikitin. 7th Int. school-seminar The actual problems of Microworld Physics, Gomel, Belarus
V.1 (2004) [hep-ph/0308139]
- ratio of evaporated gluons to all active ones
, N – parameters of hadronization for gluon
Some of active gluons (<50%) are staying inside QGS and don’t give hadron jets. New formed hadrons catching up them, are excited and throw down excess of energy by soft photons (SP).
We found weak branching of active gluons at 69 GeV/c.
MD = Poisson & Binomial
M - max number of evaporated gluons is rising (from 6 to 10)
max number of hadrons is limited by M*N
(~ 24-26 for charged particles at 69 GeV/c)
Kokoulina E. Acta Phys.Polon. B35(2004)295
KNO - - - - -
NBD - - - - -
Clan as independent intermediate gluon source.
Semenov S. et al. Sov.J. Nucl Phys.22(1975) 792
A.Giovannini, R.Ugocioni [hep-ph/0405251]
Ln (NBD) ~ Farry (TSMB)
Our results:clans consist from gluons! Change of fragmentation ( ) to recombination mechanism (hh, AA).
Ln (NBD) ~ Binom. (TSMT)
The simplification on the second stage of TSM:
Our results:max of neutral mesons = 16
max of total multiplicity =42
Mean multiplicity of neutral mesons versus the number of charged particles
a) top and bottom limits is determined by condition:
b) The noticeable improvement is reached if we decrease top limit at charged multiplicities <10 to
Our result:Centaur events may be realized in the region of HM. AntiCentaur events must be absent.
Modification.Superposition of clans:
clans consist from one, two (or more) gluons of fission:
Soft ()&semi-hard()components, and so on.
Kokoulina E., Nikitin V. et al. ISHEPP2004.hep-ph/0503254.
70 GeV/c: 1.19+/-0.25;
800 GeV/c: 1.49+/-0.33;
(cms) 62 GeV : ~ 1.6 ( )
The ratio of h/ p=1.6 is the value measured in experiment : p+p reactions (53 GeV) and
Au-Au (200 GeV/N) peripheral interactions (60-92%) RHIC.
PHENIX [nucl-exp/0410003]; X.Zhang, G.Fai.[hep-ph/0306227]
The assumption:The specific feature of our GDM approach is the dominance of a lot of active gluons at MP. We expect the emergence of them in nucleus collisions (RHIC) and the formation of new kind of matter QGP.
The black body emission spectrum:
Excess of soft photons:
Our result: L - the size of hadronization region
M.Volkov,E.Kokoulina, E.Kuraev. Part. and Nucl., Let., №5(2004)122. [hep-ph/0402163]
- annihilation (10 – 100 GeV/c)
GDM – 14.75 GeV/c
Superposition of intermediate topologies (“0”, “2” –valent q’s, “4”- valent + vacuum q’s)
+ GDM Pn-description.
“The search for signatures of quark-gluon dynamics in NN annihilation is somewhatanalogous to the search of the phase transition from a hadron gas to a quark-gluon plasma in relativistic ion transitions. The signal must be isolated from background of statistical processes characteristic of a system with many degrees of freedom. …”
C.Dover. Prog. Part. Nucl. Phys. 29(1992)87.
“… series of experimental facts and theoretical ideas which might, hopefully, transform an enigma in a Ariadna thread in the labyrinth of multiparticle dynamics in its awkward journey toward QCD and open new perspectives in pp and heavy ion collisions in the TeV energy domain.”
the thermodynamic picture of the gluon escape (evaporation);
the active role of gluons;
the charged hadron/ neutral pion ratio;
estimates of the soft photon number and the size region of emission;
2nd correl. moment in
the description of MD at higher energies;
the inclusion momentum distribution in TSM;
the investigation of gluon structure of clans;
the employment GDM for the description of - annihilation;
the hA- and AA- processes at 70 GeV/c and higher in the region of high multiplicity.Conclusions: Outlook:
Leonardo da Vinci