Difference in multiplicity distributions in proton-proton and proton-antiproton collisions at high energies

Secondary charged hadrons multiplicity distributions in proton-proton and proton-antiproton collisions differ on principle. There are three types of inelastic processes in proton-antiproton scattering. The first type is production of secondary hadrons shower at gluon string decay. The second type is shower produced from two quark strings decay, the third type is shower produced from three quark strings decay. At the same time there are only two types of inelastic processes for proton-proton scattering - gluon string shower and two quark strings shower. Theoretical description of multiplicity distributions is obtained for proton-proton collisions at energies from 44.5 GeV to 200 GeV and for proton-antiproton collisions at energies from 200 GeV to 1800 GeV. The difference between proton-proton and proton-antiproton multiplicity distributions is discussed. The predictions of multiplicity distribution and mean multiplicity at LHC energy are given.Comment: Talk given at ISMD 2009 conference 5 pages, 9 figure

About agreement of PYTHIA and the experimental results in e+e−e^+e^- annihilation to hadrons

The experimental charged particles multiplicity distributions in $e^+e^-$ annihilation to hadrons are compared with the distributions obtained by PYTHIA. The ratio $\chi^2$/degrees of freedom is calculated for 6 energies at $\sqrt{s}$ 14 -- 206.2 GeV. The necessity of more subtle tuning of PYTHIA at the energy of $Z^0$ peak is discussed.Comment: 17 pages, 9 figure

Possible difference between multiplicity distributions and inclusive spectra of secondary hadrons in proton-proton and proton-antiproton collisions at energy sqrt(s)=900 GeV

We consider QCD based model of hadrons interaction in which gluons density in wave function of initial state is low in rapidity space and real hadrons are produced by decay of color field strings. Hadrons production processes in pp and p antip interactions differ on principle. There are three types of inelastic processes in p antip collision. The first type is production of secondary hadrons shower from decay of gluon string. The second type is shower produced from decay of two quark strings and the third one -- from decay of three quark strings. At the same time there are only two types of inelastic processes for pp collision, they are shower from gluon string and shower from two quark strings. Therefore multiplicity distributions and inclusive spectra of secondary hadrons are different in pp and p antip interactions, and this difference may be observed at energy sqrt(s)=900 GeV.Comment: 12 pages, 13 figure

Total cross section of neutron-proton scattering at low energies in quark-gluon model

We show that analysis of nonrelativistic neutron-proton scattering in a framework of relativistic QCD based quark model can give important information about QCD vacuum structure. In this model we describe total cross section of neutron-proton scattering at kinetic energies of projectile neutron from 1 eV up to 1 MeV.Comment: 8 pages, 4 figure

KNO scaling in processes of electron-positron annihilation to hadrons

The charged particles multiplicity distribution in the KNO form is discussed in processes of $e^+e^-$ annihilation at energies $\sqrt{s}$ 14 -- 206.2 GeV. The experimental data are compared to data, obtained with Monte Carlo simulation in PYTHIA in the Lund quark string model. It is shown, that both experimental and simulated data are described by the same distribution function in the KNO form. It is shown, that the KNO scaling is consequence of quark string hadronization dynamics in the Lund string model.Comment: 11 pages, 5 figure

Color Diagrams for Non Vacuum Reggeons in Hadron-Hadron Interactions

One-to-one correspondence between dual diagrams of dual resonance model and QCD based color diagrams describing non vacuum exchanges in pi+ pi-, pi+- p, p anti p interactions is discussed. Both for dual and color diagrams there are state with quark-antiquark in t channel and state, in which only coherent quark string exists, in s channel. There are no such dual diagrams in pp interaction. Color diagram for pp interaction was found basing on principle of conformity. Secondary hadrons spectrum, obtained from this diagram, has nucleon in its central region. This effect may lead to increase of baryon chemical potential in nucleus-nucleus collisions in facilities NICA and FAIR.Comment: 9 pages, 13 figure

On a family of strongly regular graphs with \lambda=1

In this paper, we give a complete description of strongly regular graphs with parameters ((n^2+3n-1)^2,n^2(n+3),1,n(n+1)). All possible such graphs are: the lattice graph $L_{3,3}$ with parameters (9,4,1,2), the Brouwer-Haemers graph with parameters (81,20,1,6), and the Games graph with parameters (729,112,1,20).Comment: 17 page

Inclusive cross sections of proton-proton and proton-antiproton scattering

We have predicted the difference in inclusive cross sections on pseudorapidity in ${\rm d}\sigma^{p\bar{p}}/{\rm d}\eta$ and ${\rm d}\sigma^{pp}/{\rm d}\eta$ interactions at $\sqrt{s}=900$~GeV. Their ratio $R=\left({\rm d}\sigma^{p\bar{p}}/{\rm d}\eta\right)\left/\left({\rm d}\sigma^{pp}/{\rm d}\eta\right)\right.>1$ in the whole pseudorapidity range. On the basis of AGK theorem we show that the ratio of inclusive cross sections of $pp$ and $p\bar{p}$ at $\sqrt{s}=900$~GeV in the region of low transverse momenta $p_\perp$ up to 2~GeV $\left(\frac{1}{2\pi p_\perp}\frac{{\rm d}^2\sigma^{p\bar{p}}}{{\rm d}\eta {\rm d}p_\perp}\right)\left/\left(\frac{1}{2\pi p_\perp}\frac{{\rm d}^2\sigma^{pp}}{{\rm d}\eta {\rm d}p_\perp}\right)\right.=R$. Experimental measurements by the ATLAS Coll. give value $R\simeq1.2$ for interval $|\eta|<2.5$. The difference in inclusive cross sections results from presence of additional subprocess in $p\bar{p}$ -- hadrons production from decay of three quark strings, which is absent in $pp$ scattering.Comment: Talk presented at the ISMD 2010, Antwerp (Belgium). Some typos are correcte

Experimental evidences of difference in pppp and ppˉp\bar{p} interactions at high energies

Hadrons production is different in $p\bar{p}$ and $pp$ interactions at high energies. There is process of hadrons production from three quark strings in $p\bar{p}$ which is absent in $pp$. This process grows as $(\ln\sqrt{s})^2$ and becomes significant when energy of collision increases. Inclusive cross sections of $p\bar{p}$ interaction exceed inclusive cross sections of $pp$. Theoretical estimation of the ratio of $p\bar{p}$ to $pp$ at energy $\sqrt{s}=900$ GeV gives $R=1.12\pm0.03$. The UA1 data on $p\bar{p}$ transverse momentum distribution are about 1.2 -- 1.3 times higher than the CMS, ATLAS and ALICE data on $pp$ at energy $\sqrt{s}=900$ GeV.Comment: 16 pages, 4 figures, preprint submitted to Physics Letters

Nucleus-Nucleus Collisions at Low Energies. The Effects from Non Vacuum Exchange

Experimental data on total and differential elastic cross sections for $p+p(\bar{p})$, $n+p(\bar{p})$, $K^\pm+p$, $K^\pm+n$, $\pi^\pm+p$ starting from energy 3.5 GeV in CMS are used to determine parameters of vacuum contribution and parameters of basic non vacuum reggeons: $f$, $\omega$, $\rho$ and $A_2$. It is argued that non vacuum contributions to proton-proton and proton-neutron collisions correspond to spectrum in which baryon number is moved from the fragmentation region to central region in rapidity space. In this case it is possible that chemical potential is increased in central region of spectrum of nucleus-nucleus interaction at low energies. This effect might be important for facilities FAIR and NICA