We present a general analysis of the spin transfer for Λ and Λ production in deepinelastic scattering of polarized charged leptons on the nucleon, and find that the pattern of different behaviors of Λ and Λ production observed by the E665 Collaboration suggests the possibility of quark-antiquark asymmetries either in the quark to Λ fragmentation functions and/or in the quark and antiquark distr...

Exclusive proton–antiproton annihilation into two photons can be viewed as the Compton process in the crossed channel. At large s (≈ 10 GeV 2) and |t|, |u| ∼ s this process can be described by a generalized partonic picture, analogous to the " soft mechanism " in wide–angle real Compton scattering. The two photons are emitted in the annihilation of a single fast quark and antiquark (" handbag g...

In these short notes we present a parametrization of the results obtained in the chiral quark-soliton model for polarized antiquark distributions ∆ū, ∆d̄ and ∆s̄ at a low normalization point around μ = 0.6 GeV. The aim of these short notes is to summarize the results for the polarized antiquark distributions ∆ū, ∆d̄ and ∆s̄ obtained in refs. [1, 2, 3] in the framework of the chiral quark-soliton mo...

We investigate the interaction of strong color fields in glasma stage high-energy nuclear collisions with spins quarks and antiquarks. employ perturbative solution quantum kinetic theory for spin transport (massive) a background field governed by linearized Yang-Mills equation derive expressions quark-spin polarization quark-antiquark correlation at small momentum terms correlators. For Golec-B...

A program to simulate the production of heavy quarks through the boson-gluon fusion process in ep collisions is presented. The full electroweak structure of the electron–gluon interaction is taken into account as well as the masses of the produced heavy quarks. Higher order QCD radiation is treated using initial and final state parton showers, and hadronization is performed using the Lund strin...

The instanton interaction in QCD generates an effective potential for scalar quark-antiquark condensates in the color singlet and octet channels. For three light quark flavors the cubic term in this potential induces an octet condensate and “spontaneous breaking” of color in the vacuum. Realistic masses of the ρand η-mesons are compatible with renormalization-group-improved instanton perturbati...

We perform a careful study on the effect of the Pauli blocking to the light polarized antiquark structure of the proton sea. We develop the formal expressions for the polarized antiquark distributions, highlighting the role played by quark statistics and the vacuum structure. The ratio involving the polarized antiquarks is calculated. In particular, it is found that ∆d(x)/∆u(x) should be negati...

The contribution from the R parity violating interaction, λ ′ ijk LiQjD c k , in the associated production of a top quark (antiquark) with a charm antiquark (quark) is examined for high energy leptonic colliders. We concentrate on the reaction, l − +l + → (t¯ c)+(c ¯ t) → (b ¯ lν¯ c)+(¯ bl¯ νc), associated with the semileptonic top decay. A set of characteristic dynamical distributions for the ...

Hulthen plus Hellmann potentials are adopted as the quark–antiquark interaction potential for studying thermodynamic properties and mass spectra of heavy mesons. The was rendered temperature dependent by replacing screening parameter with Debye mass. We solved radial Schrödinger equation analytically using Nikiforov–Uvarov method. energy eigenvalues corresponding wave function in terms Laguerre...