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[Somogyi Gábor <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


Aswathy Menon K.R.
(IIT Indore, India)


“Exploring the role of initial $\alpha$-clustered nuclear structure on final 
state flow coefficients via pC, pO and O-O collisions at the LHC”


címmel tartandó szemináriumára.


Kivonat:



The much-anticipated collisions involving $^{16}\rm O$ nuclei have recently 
taken place at the Large Hadron Collider (LHC), featuring pO and O-O 
collisions at $\sqrt{s_{\rm NN}}= 9.62$ TeV and $\sqrt{s_{\rm NN}}= 5.36$ TeV 
respectively. One of the goals of these collisions is to understand the 
emergence of hydrodynamic behavior as we move from light to heavy-ion 
collisions, via the study of anisotropic flow coefficients ($v_{\rm n}$). 
Another intriguing motivation is to explore the signatures of 
$\alpha$-clustering in $^{16}\rm O$ nuclei via these relativistic collisions. 
Since the flow coefficients are sensitive to the initial nuclear structure, 
our study aims to investigate the influence of the $\alpha$-clustering on the 
final-state anisotropic flow coefficients \textit{i.e.} elliptic ($v_{2}$) 
and triangular ($v_{3}$) flow. Firstly, pO and pC collisions are studied at 
$\sqrt{s_{\rm NN}} = 9.9$~TeV using a multi-phase transport (AMPT) model. 
Here, $p_{\rm T}$ and $\eta$ spectra, eccentricity ($\langle 
\epsilon_{2}\rangle$) and triangularity ($\langle \epsilon_{3}\rangle$), 
$v_{2}$ and $v_{3}$, and their ratios are looked into, for their dependence 
on collision centrality, collision species and clustered nuclear density 
profile, in contrast to an unclustered profile. Secondly, we focus on pO 
collisions at $\sqrt{s_{\rm NN}}= 9.61$ TeV and O-O collisions at 
$\sqrt{s_{\rm NN}}= 7$ TeV using a hybrid hydrodynamics model viz. IP-Glasma 
+ MUSIC + iSS + UrQMD. Apart from the previously mentioned observables, here, 
we extend our study to check the dependence of $v_{2}$ and $v_{3}$ on the 
size of the $\alpha$-cluster ($r_{\alpha}$). We observe a clear dependence of 
$\alpha$-clustered nuclear profile on all the observables studied, when 
compared to Woods-Saxon or Sum-of-Gaussians (SOG) density profiles. The 
trends for $v_{\rm n}$ are significantly influenced by $\alpha$-clustering, 
where the unique features due to clustering are found to peak near 
$b/r_{\alpha} = 1$. However, the initial spatial anisotropy is not well 
carried over to the final state in mid-central/peripheral O-O, pO, and pC 
collisions due to the less dense system formed in these light-ion collisions.

REFERENCES:
[1] A. Menon Kavumpadikkal Radhakrishnan, S. Prasad, N. Mallick and R. Sahoo, 
Eur. Phys. J. A 61, 134 (2025).
[2]  A. Menon Kavumpadikkal Radhakrishnan, S. Prasad, N. Mallick, R. Sahoo 
and G. G. Barnaföldi, [arXiv:2505.22367 [hep-ph]].


Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2025 augusztus 15. péntek d.u. 14:00 óra

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  Somogyi Gábor