| Title: | COHERENT PHOTON-POMERON AND PHOTON-PHOTON INTERACTIONS IN ULTRA-PERIPHERAL COLLISIONS AT RHIC |
| DOI No: | 10.1142/9789812777157_0040 |
| Source: | PHOTON 2001 (pp 203-206)
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| Author(s): | F. MEISSNER
Lawrence Berkeley National Laboratory, 70-319, Berkeley, CA, 94720, USA
for the STAR Collaboration |
| Abstract: | Ultra-peripheral heavy ion collisions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius, where no nucleon-nucleon collisions occur. The first observation of coherent ρ0 production with and without accompanying nuclear breakup, AuAu → Au* Au* ρ0 and AuAu → AuAuρ0 respectively, and the observation of e+e- pair production AuAu → Au* Au* e+e- are presented by the STAR collaboration. The transverse momentum spectra are peaked at low pT, showing the coherent coupling to the nuclei. A clear ρ0 signal is observed in the two pion invariant mass spectrum. |
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