https://doi.org/10.1051/epjconf/202531604004
First D0 + D0 measurement in nucleus-nucleus collisions at SPS energies with NA61/SHINE
University of Oslo
* e-mail: anastasia.merzlaya@cern.ch
Published online: 27 January 2025
The measurement of open charm meson production provides a tool for the investigation of the properties of the hot and dense matter created in nucleus-nucleus collisions at relativistic energies. In particular, charm mesons are of vivid interest in the context of the study of the nature of the phasetransition between confined hadronic matter and the quark-gluon plasma. Recently, the NA61/SHINE experimental setup was upgraded with a high spatial resolution Vertex Detector which enables the reconstruction of secondary vertices from open charm meson decays.
The first direct neutral D meson yields at the SPS energy regime will be shown. The analysis used the 20% most central Xe+La collisions at 150A GeV/c from the data set collected in 2017. It allowed the estimation of the mid-rapidity yields (dN/dy) of D0 + D¯0 using their π± + K∓ decay channels and phase space corrections derived from the three models AMPT, PHSD, and PYTHIA/Angantyr. The results will be compared and discussed in the context of several model calculations including statistical and dynamical approaches.
© The Authors, published by EDP Sciences, 2025
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