Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-10-20
Phys.Lett. B581 (2004) 161-166
Physics
Nuclear Physics
Nuclear Theory
To appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2003.11.066
To estimate realistic cross sections in ultra peripheral heavy ion collisions we must remove effects of strong absorption. One method to eliminate these effects make use of a Glauber model calculation, where the nucleon-nucleon energy dependent cross sections at small impact parameter are suppressed. In another method we impose a geometrical cut on the minimal impact parameter of the nuclear collision ($b_{min} > R_1 + R_2$, where $R_i$ is the radius of ion "$i$"). In this last case the effect of a possible nuclear radius dependence with the energy has not been considered in detail up to now. Here we introduce this effect showing that for final states with small invariant mass the effect is negligible. However when the final state has a relatively large invariant mass, e.g. an intermediate mass Higgs boson, the cross section can decrease up to 50%.
Natale A. A.
Roldao Cristiane G.
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