T. Alexopoulos

The role of double parton collisions in soft hadron interactions

Abstract We have examined charged multiplicities arising from p−p and p− p collisions over the range of center of mass energies, s , from 30 GeV to 1800 GeV. Results from Tevatron experiment E735 support the presence of double parton interactions. These processes can be seen to account for a large fraction of the increase in the non single diffraction inelastic cross section from energies of about 200 GeV to 1800 GeV.

Charged particle multiplicity correlations in pp̄ collisions at s=0.3−1.8 TeV

Abstract The correlations between charged particle multiplicitie produced in forward and backward pseudorapidity regions in pp interactions have been measured with a 240 element scintillator hodoscope. The correlation coefficient and the variance of the difference of multiplicities in the two pseudorapidity regions were deterermined for s =0.3−1.8 TeV . These results have been interpreted in terms of a cluster model of particle production.

Evidence for hadronic deconfinement in p̄–p collisions at 1.8 TeV

Abstract We have measured deconfined hadronic volumes, 4.4 V 3 , produced by a one-dimensional (1D) expansion. These volumes are directly proportional to the charged particle pseudorapidity densities 6.75 dN c / dη T =179.5±5(syst) MeV. Using Bjorkens 1D model, the hadronization energy density is ϵ F =1.10±0.26(stat) GeV/fm 3 corresponding to an excitation of 24.8±6.2(stat) quark–gluon degrees of freedom.

Measurement of J / psi, psi-prime and upsilon total cross-sections in 800-GeV/c p - Si interactions

Abstract We report on the analysis of Charmonium and Bottomium states produced in p-Si interactions at s =38.7 GeV . The data have been collected with the open geometry spectrometer of the E771 Experiment at the FNAL High Intensity Lab. J ψ , ψ′ and γ total cross sections as well as the ratio B(ψ′ → μμ)σ(ψ′) (B( J ψ → μμ)σ( J ψ )) have been measured. Results are compared with theoretical predictions and with results at other energies.

Multiplicity dependence of transverse momentum spectra of centrally produced hadrons in pp collisions at 0.3, 0.54, 0.9, and 1.8 TeV center of mass energy

Transverse momentum spectra of charged particles produced within the pseudo-rapidity range of η= − 0.36 to + 1.0 have been measured in pp collisions at √s=0.3, 0.54, 1.0, and 1.8 TeV. The spectra are presented as a function of event charged multiplicity within the range −3.25<η<3.25. We found that the slope in the low pt region is independent of center-of-mass energy and multiplicity while the slope at the high pt region shows a strong energy and multiplicity dependence.

Search for the weak decay of a lightly bound H0 dibaryon

We present results of a search for a neutral, six-quark, dibaryon state called the h, a state predicted to exist in several theoretical models. Observation of such a state would signal the discovery of a new form of hadronic matter. Analyzing data collected by experiment E799-II, using the KTeV detector at Fermilab, we searched for the decay

A quark-gluon plasma search in p̄-p at s = 1.8 TeV

H^0 to Lambda p piminus

A one meter long low-mass mini drift vertex chamber used at the Tevatron collider

and found no candidate events. We exclude the region of lightly bound mass states just below the

φ meson production from\(p\bar p\) collisions at\(\sqrt s = 1.8\) TeV

LambdaLambda

Recent results from E-735 at the Fermilab Tevatron proton-antiproton collider with √s = 1.8TeV

mass threshold,