Cairo University

MTPR Journal


Missing energy within helium emitted in AA collisions at high energies

2014-12-19 & doi:
M. S. El-Nagdy, A. Abdelsalam, B. M. Badawy

Using the multiplicity characteristics of the final state hadron, the shower particles emitted in the 4-pspace through 4He interactions with emulsion nuclei are studied in a few A GeV region. Basing on a universality of state, the multiplicity distributions, in the backward hemisphere of the space, are determined as a function of the target size. The shower particle multiplicity, while found to depend only on the target size in the backward hemisphere, depends on both the energy and system size in the forward hemisphere. It is seen that the shower particles are originated from two emission sources. One of both emits pion in the backward hemisphere, beyond the kinematic limits, as a target source particle regarding the limiting fragmentation hypothesis. The other is the main source which emits pion in the forward hemisphere as a result of a particle creation system. The results are analyzed in the framework of the Lund Monte-Carlo program code-events generating FRITIOF model.