Exclusive scalar glueball $f_0(1500)$ production for FAIR and J-PARC energy range

Abstract

We evaluate differential distributions for exclusive scalar $f_0(1500)$ production for $p\bar{p}\to N_1{N}_2{f}_0$ (FAIR@GSI) and $pp\to pp{f}_0$ (J-PARC@Tokai). Both QCD diffractive and pion-pion meson exchange current (MEC) components are included. Rather large cross sections are predicted. The pion-pion component, never discussed in the literature, dominates close to the threshold while the diffractive component takes over for larger energies. The diffractive component is calculated based on two-gluon impact factors as well as in the framework of Khoze-Martin-Ryskin approach proposed for diffractive Higgs boson production. Different unintegrated gluon distribution functions (UGDFs) from the literature are used. The production of $f_0(1500)$ close to threshold could limit the so-called $\pi NN$ form factor in the region of larger pion virtualities.

Comments: 19 pages, 12 figures