Searching for enhancement in coalescence of in-jet (anti-)deuterons in proton-proton collisions
Physical Review C(2024)
摘要
Recent measurements from ALICE report that “in-jet” nucleons carry a
higher probability of forming a deuteron via coalescence than the nucleons from
the underlying event (UE). This study makes use of an event shape classifier to
separate the “in-jet” deuterons and the deuterons in the UE produced in
high multiplicity proton-proton collisions at √(s) = 13 TeV. Event shape
variables such as transverse spherocity allow the categorization of hard and
soft components of an event, which can be divided into two respective classes;
“jetty” and “isotropic”. The “jetty” deuterons minus the
contribution of the deuterons from the “isotropic” event are taken as
“in-jet” deuterons, and the coalescence mechanism is tested. The
coalescence is performed with a Wigner function formalism, augmented as an
afterburner to pythia8. The possible enhancement of the coalescence
probability of “in-jet” deuterons is investigated by calculating the
coalescence parameter (B_2) in different spherocity classes in
high-multiplicity pp collisions.
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