Antihydrogen formation cross sections via TBR process in presence of an external laser field

R. J. Whitehead, J F McCann, Y. Teranishi +1 more

Vladimir S. Melezhik

Chittaranjan Sinha, S. Ghosh Deb

Three body recombination (TBR) process for the formation of antihydrogen () inside a trapped plasma of antiprotons () and positrons (e+), supposed to be the most efficient mechanism for the production of cold and trapped antihydrogen is studied quantum mechanically. Present study also involves a background laser field anticipating further enhancement of the formation cross sections. Significantly large cross sections are obtained in the presence of the field at lower incident energies as compared to the field free ones. Cross sections are enhanced for higher excited states of ().

Vladimir S. Melezhik

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.

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.