Pions and kaons at 1-2 A GeV: Effect of in-medium NN → N∆ cross section
نویسندگان
چکیده
Pion multiplicity in heavy-ion collisions at the beam energies of about 1 A GeV [1, 2] is usually overpredicted by transport calculations with vacuum cross sections. Recently [3] we proposed to take into account the in-medium modifications of the NN → N∆ cross section, namely, the exchange pion collectivity, vertex renormalization by the contact nuclear interactions and Dirac effective masses of the baryons due to coupling with the scalar σ field. It turned out that the NN → N∆ cross section is substantially reduced in nuclear medium, mainly due to the effective mass corrections:
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