${\rm Y}$-meson pair production at LHC

Abstract

Theoretical predictions for $pp\to 2{\rm Y}+X$ cross section at $\sqrt{s}=8$ TeV for the LHCb and ATLAS kinematical conditions are obtained. A possibility to observe the new hypothetical particles containing two valence $b$-quarks and two valence $\bar{b}$-quarks is discussed.

Comments: 12 page, 5 figures. Several references have been added. English has been improved