Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-02-10
Eur.Phys.J. A8 (2000) 537-548
Physics
Nuclear Physics
Nuclear Theory
27 pages with 4 eps-figures included, uses axodraw.sty Tab.2 and 3 corrected
Scientific paper
10.1007/s100500070076
There exist several proposals to use Weizs\"{a}cker-Williams photons generated by ultrarelativistic heavy ions to produce exotic particles in $\gamma\gamma$ fusion reactions. To estimate the background conditions for such reactions we analyze various mechanisms of meson production in very peripheral collisions of ultrarelativistic heavy ions at RHIC and LHC energies. Besides $\gamma\gamma$ fusion they include also electromagnetic $\gamma A$ interactions and strong nucleon-nucleon interactions in grazing $AA$ collisions. All these processes are characterised by low multiplicities of produced particles. $\gamma A$ and $AA$ events are simulated by corresponding Monte Carlo codes, RELDIS and FRITIOF. In each of these processes a certain fraction of pions is produced close to the mid-rapidity region that gives a background for the $\gamma\gamma$ events. The possibility of selecting mesons produced in $\gamma\gamma$ fusion events via different $p_t$ cut procedures is demonstrated.
Bondorf Jakob P.
Chikin K. A.
Korotkih V. L.
Kryukov A. P.
Mishustin Igor N.
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