Phenomenology of new particle production in heavy-ion collisions

On the Possibility of New Particle Production in Heavy-Ion Collisions

“…(3) in conjunction with the above experimental results to obtain an upper limit on g, . 21 Thofse limits would be b 5 consistent with the new axion models 23 ' 24 since in these models the couplings of the axion to heavy quarks are suppressed.…”

“…In particular, they studied the decays of the 3.56-MeV Cr state In e Li, and the 7.03-MeV 2 + state in 14 N by internal pair conversion to the ground states of these nuclei. They deduced the branching ratio of neutral particle emission decay to the e + e~ pair emission decay to be less than 0.14 for e Li and less than 5 for l4 N. The standard axion, * 9 Krauss-Wllczek, 23 and Peccei et al 21 * models predict this ratio to be 7.2(300), 10(0), and 10(0) respectively for 6 Ll( ll *N). Thus, these two new axion models seem Co be also ruled out.…”