Abstract
The presentation has two parts, the first, and main part, is devoted to the presentation of results fromthe first measurements of the production of Λ, Σ Ξ and Ω hyperons at large timelike momentutransfers of 13.6, 14.2 and 17.4 GeV/c2 made using e+e− annihilation data taken at the CESER election-positron collider at Cornell using the CLEOc detector. The measurements reveal interesting features of hyperon production systematics and timelike form factors, and provide evidence for diquark correlations in hyperon structure. The second part of the presentation is devoted to measurements of photoproduction of J/ψ near threshold energies, EG = 8 − 12 GeV, at the new photon physics facility, GlueX, at the Jefferson Laboratory. The first preliminary results are presented. These are expected to shed light on the gluon structure of protons, gluons which mediate the production of J/ψ in the reaction,γp → J/ψ → e+e−.
Highlights
The quark-gluon model of hadrons was introduced byGell-Mann in 1956 to explain the structure of the quarkantiquark mesons and the three quark baryons which were the only hadrons known at that time
GellMann suggested that other color-neutral hadrons containing larger number of quarks and antiquarks, as well as hybrids containing valence gluons, and glueballs containing only gluons should exist
To put this opportunity in perspective, we note that four momentum transfers is defined as
Summary
Gell-Mann in 1956 to explain the structure of the quarkantiquark mesons and the three quark baryons which were the only hadrons known at that time. GellMann suggested that other color-neutral hadrons containing larger number of quarks and antiquarks, as well as hybrids containing valence gluons, and glueballs containing only gluons should exist. These predictions launched numerous searches for these unconventional hadrons. Despite many dedicated searches during the last twenty years most claims for glueballs have not survived either [2]. To put this opportunity in perspective, we note that four momentum transfers is defined as.
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