Study of exclusive central hadron production at the ISR as a search for gluonium states: the axial field spectrometer collaboration

We present a preliminary report on a study of the exclusive reaction pp ..-->.. pph/sup +/h/sup -/ (h = ..pi..,K,p) at ..sqrt..s = 63 GeV and ..sqrt..s = 45 GeV, with h/sup +/ and h/sup -/ in the central region. This reaction has been suggested as a method of searching for gluonium states. The mass distributions in the ..pi../sup +/..pi../sup -/ system appear to be identical at the two values of ..sqrt..s. They show a rapid order of magnitude decrease in cross-section at 1000 MeV/c/sup 2/ and 1500 MeV/c/sup 2/. Further structure is observed above 2000 MeV/c/sup 2/

Large angle inclusive production of protons, anti-protons and kaons, and particle composition at the cern isr

The production cross-sections for protons, antiprotons and kaons in proton-proton collisions at centre-of-mass energies square root s=30.6 and 52.8 GeV at large angles and for the transverse momentum range p /sub T/<1.2 GeV/c for protons and antiprotons and 0.2 <p/sub T/< 0.5 GeVc for kaons have been measured. The charged particle composition is given in the range 0.2<p/sub T/<0.5 GeV/c and that the K/sup +or-/ and p/sup +or-/ components have doubled this p/sub T/-range. The ratio of positive to negative produced particles increases with p/sub T/. (6 refs)

Large angle production of stable particles heavier than the proton and a search for quarks at the cern intersecting storage rings

Measurements have been performed on production of particles with mass >1.5 GeV/c/sup 2/ and charge >or=2/3 for theta /sub lab/=62.5 degrees and square root s=53 GeV. At p/sub T/=0.7 GeV/c the relative rate of production of antideuterons to pi /sup -/ is (5+or-1)*10/sup -5/. The deuteron to antideuteron ratio is 3.7+or-1.2. No new stable particle has been seen amongst 0.7*10/sup 8/ charged particles entering our detector. (7 refs)