Probing the deuteron structure at small NN distances by antiproton-deuteron annihilation

摘要

The annihilation p-bar d -> 2#pi#~-#pi#~+p at rest with the proton momentum in the final state >= 400 MeV/c is analysed. Assuming that the deuteron wave function can be represented by the Fock's column consisting of different possible states (NN, NN~*, #DELTA##DELTA#, NN#pi#,...) some enhancement in the distribution over the invariant mass of the #pi#~-#pi#~- system in the mass region 1.4-1.5(GeV/c~2) is predicted. This can be caused by the possible existence of a #DELTA# - #DELTA# component in deuteron. Using this prediction and new experimental data of the OBELIX collaboration (LEAR, CERN) one can estimate the upper limit for this exotic state of the deuteron.