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Probing initial state using higher order correlations: Vn-[pT] and Higher-order [pT] correlations in ATLAS

Not scheduled
2h
Københavns Universitetsbibliotek Nord

Københavns Universitetsbibliotek Nord

Poster The initial stages and nuclear structure in heavy-ion collisions Reception and poster session

Speaker

Somadutta Bhatta (Stony Brook University (US))

Description

Constraining the initial condition of the QGP using experimental observables is one of the most important challenges in our field. Recent studies show that both ρn(vn,[pT]) (correlation between vn and event-wise mean pT) and [pT] fluctuations can probe several ingredients of the initial state, such as number and size of sources, volume fluctuation, nuclear deformation, and initial momentum anisotropy. This talk presents new measurements of high-order [pT] fluctuations and vn[pT] correlation for n=2-4 in 129Xe+129Xe and 208Pb+208Pb collisions. The results are obtained via the standard and subevents cumulant methods to assess the role of non-flow and flow decorrelations in these observables. The variance and skewness of [pT] fluctuations as well as ρn show non-monotonic dependence on centrality, pT and η. We also found that the result depends on the centrality estimator used in the analysis, indicating a strong influence of volume fluctuations. The ρ2 is found to constrain the triaxiality of the quadrupole deformation, while the [pT] fluctuations show significant deviations from the independent source picture. The implication of these results on the nature of heavy ion initial condition, both in terms of deformation and energy deposition mechanism, is discussed.

What kind of work does this abstract pertain to? Experimental
Which experiment is this abstract related to? ATLAS

Author

Somadutta Bhatta (Stony Brook University (US))

Co-author

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