The η-baryon interactions at low energies are studied using a model based on effective chiral Lagrangians, which consider baryons with spin 1/2 and 3/2 in the intermediate states. interacting considered this work B=N,Λ,Σ,Ξ. We calculate expected total differential cross sections, phase shifts, polarizations center-of-mass frame of reference for each reaction.

The high nominal luminosity of the LHC requires a large number of bunches spaced by about 25 ns. To prevent more than one head-on collision in each interaction region, a total crossing angle of 0.285 mrad is necessary, and the bunches experience around 30 long range (LR) interactions per IP with at mean separation of 9.5 σ. For the LHC luminosity upgrade, there are two possible scenarios: the e...

Porous silicon samples were prepared by electrochemical etching method for different etching times. The structural properties of porous silicon (PS) samples were determined from the Atomic Force Microscopy (AFM) measurements. The surface mean root square roughness (σ rms) changes as function of porosity were studied, and the influence of etching time on porosity and roughness was studied too. U...

Avila and Molina [1] introduced the notion of generalized weak structures which naturally generalize minimal structures, generalized topologies and weak structures and the structures α(g),π(g),σ(g) and β(g). This work is a further investigation of generalized weak structures due to Avila and Molina. Further we introduce the structures ro(g) and rc(g) and study the properties of the structures r...

Measurement of the total cross section of ee annihilation into hadrons is one of the most important suppliers of the experimental information on the quark interactions. At high energy it serves as a test of perturbative QCD whereas at low energies it provides insight into nonperturbative effects in QCD as well as valuable input to various phenomenological models describing strongly interacting ...

The interaction between the solid particles and the pore fluid in granular materials affects various interparticle forces. The change in any one of these forces triggers the response of the granular skeleton, causes strain and even important fabric changes. Coupling phenomena that result in skeletal strains are related to fluid properties, electrical-chemical interactions, and thermal effects. ...

Precise four-body calculations for ΛHe and 4 ΛH have been performed in the framework of the variational method with Jacobian-coordinate Gaussian-basis functions. All the rearrangement channels of both NNNΛ and NNNΣ are explicitly taken into account for the first time with the use of realistic NN and Y N interactions. The role of Λ-Σ conversion and the amount of the virtual Σ-component in ΛHe an...

We calculate neutrino cross sections from neutral current reactions in dense matter containing hyperons. We show that Σ− hyperons give significant contributions. To lowest order, the contributions from the neutral Λ and Σ, which have zero hypercharge, vanish. However, their presence furnishes baryon number which decreases the relative concentrations of nucleons. This leads to significant reduct...