Coupled channels and production of near-threshold $B^{(\ast )}{\bar{B}}^{(\ast )}$ resonances in $e^{+}{e}^{-}$ annihilation

Abstract

The effects of final-state interaction of hadrons, produced in $e^{+}{e}^{-}$ annihilation near the threshold, are discussed. If there is a loosely bound state or a virtual state in a system of produced hadrons, then the energy dependence of hadroproduction cross section is very strong. Our approach is based on the use of the effective potentials accounting for the interaction between hadrons in the final state. The cases of a few channels with nonzero transition amplitudes between them are considered. It is shown that these transitions drastically change the energy dependence of the cross sections. In particular, a narrow resonance below the threshold in one channel leads to a broad peak in another channel. We explained the non-trivial energy dependence of the production cross sections of $B\bar{B}$, $B^{\ast }\bar{B}$, $B{\bar{B}}^{\ast }$, $B^{\ast }{\bar{B}}^{\ast }$ near the thresholds in $e^{+}{e}^{-}$ annihilation and obtained good agreement between our predictions and the experimental data available.

15 pages, 11 figures

References in corpus (10)

• Observation of a near-threshold enhancement in the e+e- -->Lambda_c+Lambda_c- cross section using initial-state radiation
• New Features in the Electromagnetic Structure of the Neutron
• The electromagnetic form factors of the proton in the timelike region
• The electromagnetic form factors of the $\Lambda$ in the timelike region
• Hyperon electromagnetic form factors in the timelike region
• $N\bar{N}$ production in $e^{+}{e}^{-}$ annihilation near the threshold revisited
• Coulomb effects in the decays ${\rm Y}(4S)\to B\bar{B}$
• Final-state interaction in the process $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$
• Final State Interaction Effects in the $e^{+}{e}^{-}\to N\bar{N}$ Process near Threshold
• Effects of isospin violation in the $e^{+}{e}^{-}\to B^{(\ast )}{\bar{B}}^{(\ast )}$ cross sections

Cited by in corpus (4)

• Near-threshold resonance in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ process
• Production of $D^{(\ast )}{\bar{D}}^{(\ast )}$ near the thresholds in $e^{+}{e}^{-}$ annihilation
• Meson production in $J/\psi$ decays and $J/\psi \to N\bar{N}\gamma$ process
• Charge asymmetry in $e^{+}{e}^{-}\to B^{(\ast )}{\bar{B}}^{(\ast )}$ processes in the vicinity of ${\rm Y}(4S)$