10 research outputs found
Strangeness Enhancement Scenarios: Fireball or Independent Strings?
Due to the long-standing discrepancy between NA35 and NA36 data on
production, two drastically different scenarios of strangeness enhancement are
still possible. Independent string models, such as the dual parton model, lead
to results close to the NA36 data. On the contrary, the NA35 results can only
be described by introducing full final state rescattering of the produced
particles. The corresponding predictions for central - collisions at
CERN energies differ by a factor 3 to 4. Preliminary data on the net proton
(-) rapidity distribution in - collisions favor the
independent string scenario.Comment: 12 pages, Plain Tex, no figure
Relative dielectron yields in p + p and p + d interactions from Ebeam = 1.0–4.9 GeV
The beam energy and invariant mass dependence of the dielectron yield in p + d interactions relative to the yield in p + p interactions is presented for incident kinetic energies from 1.0–4.9 GeV. The ratio of the yield in p + d interactions to that in p + p interactions decreases from 10.5±1.6 at 1.0 GeV to 1.96±0.08 at 4.9 GeV for electron pairs with invariant masses ⩾ 0.15 GeV/c2. The large ratio at 1.0 GeV suggests that dielectron production in the p + d system is dominated by a p + n process. The beam energy dependence of the ratio indicates that this p + n contribution decreases with respect to the other dielectron sources as the incident energy is increased