https://doi.org/10.1140/epja/s10050-025-01738-8
Regular Article - Theoretical Physics
Event shape engineering and study of identified particle production in Oxygen–Oxygen collisions at 
= 7 TeV using AMPT
1
Department of Physics, University Institute of Sciences, Chandigarh University, Mohali, 140413, Punjab, India
2
Department of Physics, Koneru Lakshmaiah Education Foundation, Vaddeswaram, 522502, Guntur, Andhra Pradesh, India
3
C. M. Science College, L. N. Mithila University, Lal Bagh, 846004, Darbhanga, Bihar, India
a
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Received:
8
July
2025
Accepted:
20
October
2025
Published online:
17
November
2025
Abstract
We investigate identified particle production in Oxygen–Oxygen (O–O) collisions at 
7 TeV using the A Multi-Phase Transport (AMPT) model with string melting (SM). The study employs transverse spherocity as an event-shape observable to classify events into jetty (hard-QCD dominated) and isotropic (soft-QCD dominated) categories. This classification enables a detailed examination of transverse momentum spectra (
), mean transverse momentum (
), and integrated yields (dN/dy) for the identified particles: pions, kaons, and protons for different centrality classes. Our findings reveal distinct particle production behaviors between isotropic and jetty events. Isotropic events dominate low-
regions, while jetty events contribute significantly at high-, with a crossing point in the spectra that shifts with particle mass and collision centrality. Additionally, nuclear density profiles—Woods–Saxon, harmonic oscillator, and 
-clustered—exhibit measurable effects on and yields, particularly in central collisions, with -clustered profiles showing enhanced radial flow. The trends of and yield variations suggest that collective effects are more prominent in central events and for heavier particles. The results emphasize the utility of spherocity in probing QGP-like behavior and highlight the sensitivity of observables to the initial-state geometry. This work provides valuable theoretical input for upcoming experimental investigations at the LHC.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
Communicated by Che-Ming Ko.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
