Photon 2015

15-19 June 2015
Asia/Novosibirsk timezone
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Contribution Oral presentation

Small x, diffraction, and total cross sections

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

Speakers

• Dr. Mariola KLUSEK-GAWENDA

Content

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].