Coherent rho0 production in ultraperipheral heavy ion collisions

The STAR collaboration
Phys.Rev.Lett. 89 (2002) 272302, 2002.

Abstract (data abstract)
The STAR Collaboration reports the first observation of exclusive $\rho^0$ photoproduction, $AuAu\rightarrow AuAu\rho^0$, and $\rho^0$ production accompanied by mutual nuclear Coulomb excitation, $AuAu\rightarrow Au^\ast Au^\ast \rho^0$, in ultraperipheral heavy-ion collisions. The $\rho^0$ have low transverse momenta, consistent with coherent coupling to both nuclei. The cross sections at $\sqrt{s_{_{NN}}}$ = 130 GeV agree with theoretical predictions treating $\rho^0$ production and Coulomb excitation as independent processes.

  • Figure 3.0

    Data from Figure 3.0


    Differential cross section $d\sigma(\gamma Au \rightarrow \rho Au)/dt$ of $\rho^0$ candidates

  • Figure 4.0

    Data from Figure 4.0


    Differential cross section $d\sigma/dM_{\pi\pi}$ for two-track (xn,xn) events with pair $p_T<150$ MeV/$c$

  • Figure 4.1

    Data from Figure 4.0


    Total background in the differential cross section $d\sigma/dM_{\pi\pi}$

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