Multiphoton effects in three-body recombination for antihydrogen formation

Carlos A. Ordonez

S. Ghosh Deb, Chittaranjan Sinha

Laser-assisted multiphoton cross-sections for the formation of antihydrogen ( ) via the three-body recombination (TBR) process in a plasma of antiprotons ( 's) and positrons ( e + 's) are studied for the ground and excited states (n=2 level). Significantly large enhancement is noted due to multiphoton effects particularly in the ground-state formation cross-section at lower incident energies with respect to the field-free case. The multiphoton ground-state cross-section dominates almost throughout the energy range (except at extreme low energies) in contrast to the field-free case. The formation cross-sections are found to be much higher for unequal energies of the two incident (active and spectator) e + 's than for equal energies.

Rajesh Radhakrishnan

S. Ghosh Deb, Chittaranjan Sinha

Laser- assisted antihydrogen formation cross sections (differential and total) via the three - body recombination (TBR) process in a plasma of antiprotons and positrons are studied for the ground and excited states . Significantly large cross sections are obtained for low energies. The ground state antihydrogen cross section dominates throughout the energy range, essential for high precision spectroscopics studies in order to test the CPT theorem. The formation cross section are found to be much higher for unequal energies of the two positrons than for equal energies.

D. E. Kelleher, M. Ligare, L. Brewer

Bernard Zygelman

The formation of antihydrogen atoms via three-body recombination (TBR) of antiprotons with positrons is considered. A collisional radiative model for the recombination process is employed to study the time dependence of state-resolved antihydrogen populations. We show that at low temperatures T −9/2 scaling of the TBR coefficient does not characterize the total recombination rate, and an alternative expression for the three-body rate coefficient is proposed.