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Here a preliminary study is presented concerning the detection of thenormally unseen Drell-Yan fragments, possible in the PANDA experiment. To workas a multi-purpose apparatus, this experiment will record all the particlesproduced in the collisions between the antiproton beam and the target, with arather wide acceptance. So detecting Drell-Yan dileptons with or withoutanalyzing the other fragments is just a matter of applying cutoffs in the dataanalysis stage. The distribution of the products of 50,000 typical Drell-Yanevents is here simulateded using a well-known generator code (Pythia-8). Theresulting distributions are inserted within the PANDA acceptance region, toanalyze the chances of missing some searched fragment combinations, or ofconfusing different sets of particles. The most interesting result is that, dueto the reduced phase space, the produced states are much simpler than one couldimagine: (i) almost 50 % of the events just consist of a dilepton plus anucleon-antinucleon pair; (ii) practically all events present anucleon-antinucleon pair; (iii) the number of light particles (photons over aninfrared cutoff and pions) is pretty small. The presented simulations show thatit is possible to study experimentally some, or some aspects, of the mostrelevant final states, with good statistics and precision.

At the borderline between exclusive and inclusive physics: Study of Drell-Yan fragments in the PANDA experiment (A preliminary simulation)