A pr 1 99 4 Effects of N ∗ ( 1440 ) resonance on subthreshold kaon , antikaon , and antiproton production
نویسندگان
چکیده
We study the effects of N * (1440) resonance on the production of kaons, an-tikaons and antiprotons in heavy-ion collisions at subthreshold energies. Using free-space widths for the ∆(1232) and the N * (1440) resonance and free-space thresholds for particle production, it is found that the N *-baryon interactions contribute about 10%, 25% and 80% to the yield of kaon, antikaon and antiproton, respectively. Doubling the widths of resonances due to possible medium effects, both the total and the N * induced antiproton yield decrease by about a factor of 3. Using a reduced antiproton production threshold in a nuclear medium as a result of dropping in-medium nucleon and antiproton masses, the total and the N * induced antiproton yield increase by a factor of 35 and 27, respectively, and the contribution of the N * induced collisions is reduced to about 50% of the total.
منابع مشابه
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