Global constraint on the jet transport coefficient from single-hadron, dihadron, and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>-hadron spectra in high-energy heavy-ion collisions

Abstract

Modifications of large transverse momentum single-hadron, dihadron, and <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>γ</a:mi></a:math>-hadron spectra in relativistic heavy-ion collisions are direct consequences of parton-medium interactions in the quark-gluon plasma (QGP). The interaction strength and underlying dynamics can be quantified by the jet transport coefficient <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mover accent="true"><b:mi>q</b:mi><b:mo>̂</b:mo></b:mover></b:math>. We carry out the first global constraint on <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mover accent="true"><d:mi>q</d:mi><d:mo>̂</d:mo></d:mover></d:math> using a next-to-leading order pQCD parton model with higher-twist parton energy loss and combining world experimental data on single-hadron, dihadron, and <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"><f:mi>γ</f:mi></f:math>-hadron suppression at both RHIC and LHC energies with a wide range of centralities. The global Bayesian analysis using the information field (IF) priors provides the most stringent constraint on <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"><g:mrow><g:mover accent="true"><g:mi>q</g:mi><g:mo>̂</g:mo></g:mover><g:mrow><g:mo>(</g:mo><g:mi>T</g:mi><g:mo>)</g:mo></g:mrow></g:mrow></g:math>. We demonstrate in particular the progressive constraining power of the IF Bayesian analysis on the strong temperature dependence of <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:mover accent="true"><i:mi>q</i:mi><i:mo>̂</i:mo></i:mover></i:math> using data from different centralities and colliding energies. We also discuss the advantage of using both inclusive and correlation observables with different geometric biases. As a verification, the obtained <k:math xmlns:k="http://www.w3.org/1998/Math/MathML"><k:mrow><k:mover accent="true"><k:mi>q</k:mi><k:mo>̂</k:mo></k:mover><k:mrow><k:mo>(</k:mo><k:mi>T</k:mi><k:mo>)</k:mo></k:mrow></k:mrow></k:math> is shown to describe data on single-hadron anisotropy at high transverse momentum well. Predictions for future jet quenching measurements in oxygen-oxygen collisions are also provided. Published by the American Physical Society 2024

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