MC study of the reconstruction of $\pi^0$ in MPD/ECal

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Future facilities and instrumentation Poster Session

Speaker

Dr Yan Huang (Tsinghua University)

Description

The main goal of NICA/MPD is to investigate the hot and dense baryonic matter in heavy-ion collisions over a wide range of atomic masses, from $Au+Au$ collisions at a center-of-mass energy of $\sqrt{s_{NN}} = 11GeV$ (for $Au^{79+}$) to proton-proton collisions with $\sqrt{s_{pp}}= 20GeV$.
Electromagnetic calorimeter (ECal) is an important detector of the MPD to identify electrons, photons and measure their energy with high precision. The performance of the ECal is simulated and analyzed of a function of many parameters such as the multiplicity, energy spectrum, kinematic. $\pi^0$ signal can be reconstructed from two photons and it is a very important probe to give information of the chiral symmetry restoration and flow signal. The shape of reconstructed $\pi^0$ mass spectra is analyzed. Dependence of the $\pi^0$ reconstruction efficiency from the decay parameters is studied.
Theta angle reconstructed in the ECal has a clear deviation from real angle as a function of Z position of the interacting point. This theta angle bias is caused by the small deviation from projective geometry for the Z position which is not equal to zero. This bias is corrected and applied to the reconstruction of $\pi^0$, which improved the results of the reconstruction of $\pi^0$.

Primary author

Dr Yan Huang (Tsinghua University)

Co-authors

Ms Boyana Dabrowska (Joint Institute for Nuclear Research) Prof. Yi Wang (Tsinghua University) Mr Igor Tyapkin (Joint Institute for Nuclear Research)

Presentation Materials