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Prompt and non-prompt elliptic flow in Pb+Pb collisions at Tev with the ATLAS detector
1Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco.
The European Physical Journal. C, Particles and Fields
|April 11, 2019
Summary
Prompt and non-prompt J/psi mesons exhibit non-zero elliptic flow in lead-lead collisions. J/psi elliptic flow decreases with transverse momentum for prompt mesons, while remaining flat for non-prompt mesons.
Area of Science:
- High-energy nuclear physics
- Particle physics
- Quantum chromodynamics
Background:
- Understanding the properties of the quark-gluon plasma (QGP) is crucial in high-energy nuclear physics.
- J/psi mesons are effective probes for studying the QGP due to their high mass and binding energy.
Purpose of the Study:
- To measure the elliptic flow of prompt and non-prompt J/psi mesons in Pb+Pb collisions.
- To investigate the production mechanisms and medium interactions of J/psi mesons.
Main Methods:
- Measurement of J/psi mesons via their dimuon decay channel.
- Separation of prompt and non-prompt J/psi signals using invariant mass and pseudo-proper decay time.
- Analysis of elliptic flow coefficient (v2) as a function of transverse momentum, rapidity, and centrality.
Main Results:
- Non-zero elliptic flow was observed for both prompt and non-prompt J/psi mesons.
- Prompt J/psi elliptic flow decreases with increasing transverse momentum.
- Non-prompt J/psi elliptic flow shows a flat behavior with transverse momentum within statistical uncertainties.
Conclusions:
- The results provide insights into the J/psi production and suppression mechanisms in the QGP.
- The observed elliptic flow suggests interactions of J/psi mesons with the hot and dense medium.
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