# Photon 2015

15-19 June 2015
Asia/Novosibirsk timezone

## Double scattering production of two ρ0 mesons and four pions in ultraperipheral heavy ion collisions(remote)

18 Jun 2015, 16:50
20m
Oral presentation Small x, diffraction, and total cross sections

### Speaker

Dr Mariola Klusek-Gawenda (Institute of Nuclear Physics PAN Krakow)

### Description

We will discuss a possibility to study the $\rho^0(770)$ mesons production in ultrarelativistic ultraperipheral heavy ion collisions. We evaluate for the first time differential distributions for exclusive production of two $\rho^0(770)$ mesons (four charged pions) in the double scattering (photon-Pomeron) process [1]. The results will be compared with the contribution of two-photon mechanism discussed previously in the literature [2]. The double scattering mechanism populates large dimeson invariant masses and large rapidity distance between mesons. The resulting distributions for four pions will be presented and compared to the STAR data [3]. Predictions for the LHC will be shown. We will discuss a possibility of identifying the double scattering mechanism at the LHC energy. The above analysis includes the smearing of $\rho^0$ mass which was presented recently by the ALICE Collaboration [4]. [1] M. Klusek-Gawenda and A. Szczurek, Phys. Rev. C 89 (2013) 024912, [2] M. Klusek, W. Schafer and A. Szczurek, Phys. Lett. B 674 (2009) 92, [3] B. I. Abelev et al. (STAR Collaboration), Phys. Rev. C 81 (2010) 044901, [4] Adam, Jaroslav et al. (ALICE Collaboration), arXiv:1503.09177 [nucl-ex].

### Primary author

Prof. Antoni Szczurek (Institute of Nuclear Physics PAN Krakow)

### Co-author

Dr Mariola Klusek-Gawenda (Institute of Nuclear Physics PAN Krakow)

 Slides