Compositions and collisions at degreep2

Identified hadron compositions in p+p and Au+Au collisions at high transverse momenta at √S(NN)=200 GeV.

We report transverse momentum (p(T)≤15  GeV/c) spectra of π(±), K(±), p, p[over ¯], K(S)(0), and ρ(0) at midrapidity in p+p and Au+Au collisions at √S(NN)=200  GeV. Perturbative QCD calculations are consistent with π(±) spectra in p+p collisions but do not reproduce K and p(p[over ¯]) spectra. The observed decreasing antiparticle-to-particle ratios with increasing p(T) provide experimental evid...

Collisions at Rhic

We study the production of W and Z gauge bosons in proton-proton and proton-neutron collisions up to a center-of-mass energy √ s = 0.5 TeV , in connection with the realistic possibility of having proton-deuteron collisions at RHIC with a high luminosity. We stress the importance of measuring unpolarized cross sections for a better determination of the flavor asymmetry of the sea quarks. Since p...

Collisions at Bepc

AGeV collisions at STAR

STAR has performed a correlation analyses of pion-kaon and pion-proton pairs for √ sNN = 130AGeV and √ sNN = 200AGeV and kaon-proton, protonLambda and pion-Cascade pairs for AuAu collisions √ sNN = 200AGeV . They show that average emission space-time points of pions, kaons and protons are not the same. These asymmetries are interpreted as a consequence of transverse radial expansion of the syst...

Collisions at ILC and CLIC Energies

We obtain bounds for the mass of the extra neutral gauge boson, Z , predicted by two versions of SU(3)C × SU(3)L × U(1)X model, namely one corresponding to its minimal version and another where the neutrinos are allowed to have right-handed projection. We explore √ s from 0.5 TeV to 5 TeV region, that will be accessible in next linear colliders (ILC and CLIC). We used the process e+ + e −→ f+ +...