Michal Praszalowicz

SU(3) extension of the skyrme model

Abstract The lagrangian and hamiltonian of the SU(3) L × SU(3) R non-linear sigma model are given in terms of collective variables. It is argued that the model describes the octet and decuplet of baryons, and the interpretation of the unbroken symmetries of the system is given. The model is quantized and the numerical results are compared with the data.

Pion light cone wave function in the nonlocal NJL model

We use the simple instanton motivated NJL-type model to calculate the leading twist pion light cone wave function. The model consists in employing the momentum dependent quark mass in the quark loop entering the definition of the wave function. The result is analytical up to a solution of a certain algebraic equation. Various properties including the kT dependence of the pion wave function are discussed. The resulting kT integrated wave function is not asymptotic and is in agreement with recent analysis of the CLEO data.

Transverse momentum of protons, pions and kaons in high multiplicity pp and pA collisions: Evidence for the color glass condensate?

Abstract The CMS experiment at the Large Hadron Collider has recently presented data on the average transverse momentum of protons, kaons and pions as a function of particle multiplicity. We relate the particle multiplicity to saturation momentum using recently published computations of the interaction radius determined from the theory of the Color Glass Condensate. We show that the pp and the pA experimental data scale in terms of these saturation momenta. Computing transverse momentum spectra for identified particles using Boltzmann-type distributions and relating different associated multiplicities using geometric scaling, these simple distributions reproduce the observed dependence of the mean transverse momentum on particle multiplicities seen in both pp and pA interactions for pions to good accuracy, and to fair agreement for protons and kaons.

Saturation and Scaling of Multiplicity, Mean

In the previous paper we have argued that the LHC data on multiplicity, average transverse momentum, and charged particle transverse momentum distributions are well described with minimal modeling in terms of a saturation scale Q_sat(s). As a consequence, the p_T spectra should exhibit geometric scaling. In this short note we show that recently released CMS data at sqrt{s}=0.9, 2.36 and 7 TeV fall on a universal curve when plotted in terms of suitably defined scaling variable \tau.

p_T

We calculate magnetic transition moments in the chiral quark-soliton model, with explicit SU(3)-symmetry breaking taken into account. The dynamical model parameters are fixed by experimental data for the magnetic moments of the baryon octet and from the recent measurements of {theta}{sup +} mass. Known magnetic transition moments {mu}{sub {lambda}}{sub {sigma}}, {mu}{sub N{delta}} are reproduced and predictions for other octet-decuplet and octet-antidecuplet transitions are given. In particular {mu}{sub {sigma}}{sub {sigma}}{sub *} recently constrained by SELEX is shown to be below 0.82{mu}{sub N}. The recent GRAAL data on {eta} photoproduction off the nucleon are explained in terms of a new narrow antidecuplet neutronlike resonance.

and

We show that the pT spectra measured in pp collisions at the LHC exhibit geometrical scaling introduced earlier in the context of deep inelastic scattering. We also argue that the onset of geometrical scaling can be seen in nucleus-nucleus collisions at lower RHIC energies.

p_T

We reanalyze the magnetic moments of the baryon octet, decuplet, and antidecuplet within the framework of the chiral quark-soliton model, with SU(3) symmetry-breaking taken into account. We consider the contributions of the mixing of higher representations to the magnetic moment operator arising from the SU(3) symmetry-breaking. Dynamical parameters of the model are fixed by experimental data for the magnetic moments of the baryon octet and from the masses of the octet, decuplet and of {theta}{sup +}. The magnetic moment of {theta}{sup +} depends rather strongly on the pion-nucleon sigma term and reads -1.19 nm to -0.33 nm for {sigma}{sub {pi}}{sub N}=45 and 75 MeV, respectively. The recently reported mass of {xi}{sub 10-bar}{sup --}(1862) is compatible with {sigma}{sub {pi}}{sub N}=73 MeV. As a by-product the strange magnetic moment of the nucleon is obtained with a value of {mu}{sub N}{sup (s)}=+0.39 nm.

Distributions from 200 GeV < sqrt{s} < 7 TeV - Addendum

Within the semibosonized SU(3)-NJL model the mass splittings of baryons and the axial vector coupling constants of the nucleon are evaluated. The mass splittings of the hyperons are reproduced with great accuracy if second order corrections in

Exotic and nonexotic magnetic transitions in the context of the SELEX and GRAAL experiments

m_s

Geometrical scaling in hadronic collisions

are taken into account. New corrections to the axial vector currents coming from the subleading terms in the