Search for the anomalous ZZH couplings at the CLIC

We have investigated the potential of Higgs boson production at [Formula: see text] mode of the Compact Linear Collider (CLIC) to probe anomalous ZZH couplings. Considering two different center of mass energies of CLIC ([Formula: see text] = 1.5 and 3 TeV) and various integrated luminosities, we have calculated 95% confidence level (CL) bounds on the anomalous ZZH coupling parameters [Formula: see text], [Formula: see text] and [Formula: see text]. We perform an analysis through the process [Formula: see text] with systematic uncertainties of [Formula: see text] = 0%, 5%, 10%. Obtained results have been discussed in terms of capability to probe anomalous ZZH couplings in the photoproduction process.

Transverse and Longitudinal Lambda Polarization in Lepton Scattering by Unpolarized Nucleons at HERMES

Transverse and longitudinal polarization of [Formula: see text] hyperons has been studied. The transfere of polarization from high-energy positron to [Formula: see text] hyperon has been measured. The longitudinal spin transverse coefficient is found to be [Formula: see text] = [Formula: see text]. The transverse polarization of [Formula: see text] and [Formula: see text] hyperons has been measured in inclusive quasireal photoproduction process for various target nuclei. The polarization observed is positive for light target nuclei and compartaible with zero for heavy target nuclei.

Generalized two-point tree-level amplitude j f → j′ f′ in a magnetized medium

The tree-level two-point amplitudes for the transitions j f → j′ f′, where f is a fermion and j is a generalized current, in a constant uniform magnetic field of an arbitrary strength and in charged fermion plasma, for the j f f interaction vertices of the scalar, pseudoscalar, vector and axial-vector types have been calculated. The generalized current j could mean the field operator of a boson, or a current consisting of fermions, e.g. the neutrino current. The particular cases of a very strong magnetic field, and of the coherent scattering off the real fermions without change of their states (the "forward" scattering) have been analyzed. The contribution of the neutrino photoproduction process, [Formula: see text], to the neutrino emissivity has been calculated with taking account of a possible resonance on the virtual electron.

A combination of hadronic form factors for modeling the kaon photoproduction process γp → K+Λ

We have phenomenologically investigated the kaon photoproduction process γp → K+Λ by combining different types of hadronic form factors (HFFs) inside a covariant isobar model. We obtained the best model with the smallest χ2/N by using the dipole form factor in the Born terms and a combination of the dipole, Gaussian, as well as generalized dipole form factors in the hadronic vertices of the nucleon, kaon and hyperon resonances. By utilizing this model we found that the experimental data used in the analysis are internally consistent, whereas the behavior of differential cross-section at forward angles is not significantly affected by the variation of hadronic coupling constants (CCs) and form factor cutoffs in the model.

EXCLUSIVE PRODUCTION OF VECTOR MESONS IN pp AND $p\bar p$ COLLISIONS

Photoproduction process γp → Vp has been mesured recently at HERA. We compare our results with the recent data. The corresponding amplitude is used to predict the cross section for exclusive production in pp and [Formula: see text] collisions. Here we present distribution in rapidity and transverse momentum of vector mesons for Tevatron and LHC energies. The absorption effects are discussed.

PHOTOPRODUCTION OF THE NEUTRAL KAON IN THE THRESHOLD REGION AT LNS

The K0 photoproduction process is investigated in the threshold region, Eγ = 0.8-1.1 GeV at LNS-Tohoku. K0 events are measured via π+π- decay channel. Obtained momentum spectra for the deuteron target are compared with those calculated in the spectator model using a realistic deuteron wave function. Recent isobar models and a simple phenomenological model are used as elementary amplitudes to investigate the effect of the new data on the angular behavior of the elementary cross section. The data favor a backward-peaked angular distribution of the elementary n(γ, K0)Λ process in the center-of-mass (c.m.) system, which provides additional constraints on current models of kaon photoproduction. The present study shows that the n(γ, K0)Λ reaction can provide key information on the mechanism of the photoproduction of strangeness.