Search for quasi-particle scattering in the quark-gluon plasma with jet splittings in pp and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV - INSPIRE

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Search for quasi-particle scattering in the quark-gluon plasma with jet splittings in pp and Pb $-$ Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

ALICE

Collaboration

Sep 19, 2024

26 pages

e-Print:

2409.12837 [nucl-ex]

Report number:

CERN-EP-2024-238

Experiments:

CERN-LHC-ALICE

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Abstract: (arXiv)

The ALICE Collaboration reports measurements of the large relative transverse momentum (

k_{\text{T}}

) component of jet substructure in pp and in central and semicentral Pb

-

Pb collisions at center-of-mass energy per nucleon pair

\sqrt{s_{\text{NN}}}=5.02

TeV. Enhancement in the yield of such large-

k_{\text{T}}

emissions in central Pb

-

Pb collisions is predicted to arise from partonic scattering with quasi-particles of the quark-gluon plasma. The analysis utilizes charged-particle jets reconstructed by the anti-

k_{\text{T}}

algorithm with resolution parameter

R=0.2

in the transverse-momentum interval

60 < p_{\text{T,ch jet}} < 80

\text{GeV}/c

. The soft drop and dynamical grooming algorithms are used to identify high transverse momentum splittings in the jet shower. Comparison of measurements in Pb

-

Pb and pp collisions shows medium-induced narrowing, corresponding to yield suppression of high-

k_{\text{T}}

splittings, in contrast to the expectation of yield enhancement due to quasi-particle scattering. The measurements are compared to theoretical model calculations incorporating jet quenching, both with and without quasi-particle scattering effects. These measurements provide new insight into the underlying mechanisms and theoretical modeling of jet quenching.

Note:

26 pages, 4 captioned figures, 2 tables, authors from page 20, submitted to PRL, figures at http://alice-publications.web.cern.ch/node/11331

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