The exclusive processes are considered, where a pointlike source of heavy quark-antiquark pairs QQ, e.g., their electromagnetic current, produces a pair consisting of a heavy quarkoniumlike exotic meson (tetraquark) or baryon (pentaquark) and a light meson or an antibaryon. For a sufficiently large mass of the heavy quark mQ there is a range of the energy E above the QQ threshold, where Eâ‰mQ and still the energy is large compared to the strong interaction scale, Eâ‰ΛQCD. It is shown that in this energy range, where the heavy quarks are nonrelelativistic, a specific "intermediate asymptotic" behavior sets in determined by the number n of the pairs of constituent quarks, with the rate scaling as E1-n.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Oct 28 2016|