From the γ γ → p p ¯ reaction to the production of p p ¯ pairs in ultraperipheral ultrarelativistic heavy-ion collisions at the LHC

摘要: In this paper we consider the production of proton-antiproton pairs in two-photon interactions electron-positron and heavy-ion collisions. We try to understand dependence total cross section on photon-photon c.m. energy as well corresponding angular distributions measured by Belle Collaboration for $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}p\overline{p}$ process. To data include proton-exchange, ${f}_{2}(1270)$ ${f}_{2}(1950)$ $s$-channel exchanges, hand-bag mechanism. The helicity amplitudes $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{f}_{2}\ensuremath{\rightarrow}p\overline{p}$ process are written explicitly based a Lagrangian approach. parameters vertex form factors adjusted data. Having described present first predictions ultraperipheral, ultrarelativistic, reaction $^{208}Pb^{208}Pb\ensuremath{\rightarrow}^{208}Pb^{208}Pbp\overline{p}$. Both, several differential experimental cuts ALICE, ATLAS, CMS, LHCb experiments presented. find $100\text{ }\text{ }\ensuremath{\mu}\mathrm{b}$ ALICE cuts, $160\text{ ATLAS $500\text{ CMS $104\text{ taking into account cuts. This opens possibility study at LHC.