Measurements of $${\pi}^{\mathbf{0}}$$ Elliptic Flow in Cu $$\boldsymbol{+}$$ Au Collisions

Le résumé fourni par la source

Studying the properties of deconfined state of partonic matter, or so-called quark-gluon plasma (QGP), can be performed using different observables, such as azimuthal anisotropy of emitted hadrons in heavy-ion collisions. To quantify observed azimuthal anisotropy in momentum space the elliptic flow ( $$v_{2}$$ ) is used. Since the spatial azimuthal anisotropy arises in the early stages after the collision of nuclei, where the QGP phase can dominate, the elliptic flow is considered a sensitive tool to study the collective behavior in QGP. To study the development of the elliptic flow, measurements of $$v_{2}$$ values can be made for different particle’s species and collision geometries. The measurement of $$v_{2}$$ for $$\pi^{0}$$ mesons is particularly interesting in this regard since their production is measurable up to high values of transverse momentum ( $$p_{T}>5$$ GeV/c). The talk will present new results for $$\pi^{0}$$ elliptic flow in Cu $$+$$ Au collisions as a function of $$\pi^{0}$$ transverse momentum for different centralities. This set of results provides an additional opportunity to identify the dominant mechanisms in the development of $$\pi^{0}$$ elliptic flow over a wide range of transverse momentum in Cu $$+$$ Au collisions.

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