Measurements of jet quenching using semi-inclusive hadron+jet distributions in pp and central Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

Description
Figures from paper submitted to Physical Review C
Abstract:

The ALICE Collaboration reports measurements of the semi-inclusive distribution of charged-particle jets recoiling from a high transverse momentum (high $p_{\rm T}$) charged hadron, in pp and central Pb$-$Pb collisions at center-of-mass energy per nucleon$-$nucleon collision $\sqrt{s_{\rm NN}}=5.02$ TeV. The large uncorrelated background in central Pb$-$Pb collisions is corrected using a data-driven statistical approach, which enables precise measurement of recoil jet distributions over a broad range in $p_{\rm T,ch\,jet}$ and jet resolution parameter $R$. Recoil jet yields are reported for $R=0.2$, 0.4, and 0.5 in the range $7 <~ p_{\rm T,ch\, jet} <~ 140$ GeV$/c$ and $\pi/2<~\Delta\varphi<~\pi$, where $\Delta\varphi$ is the azimuthal angular separation between hadron trigger and recoil jet. The low $p_{\rm T,ch\,jet}$ reach of the measurement explores unique phase space for studying jet quenching, the interaction of jets with the quark-gluonnplasma generated in high-energy nuclear collisions. Comparison of $p_{\rm T,ch\,jet}$ distributions from pp and central Pb$-$Pb collisions probes medium-induced jet energy loss and intra-jet broadening, while comparison of their acoplanarity distributions explores in-medium jet scattering and medium response. The measurements are compared to theoretical calculations incorporating jet quenching.

Physical Review C 110 (2024) 014906
e-Print: arXiv:2308.16128 | PDF | inSPIRE

Paper:

Energy
5.02 TeV
System
p-p
Pb-Pb
Scope: PWG
PWG-JE (Jets)
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p-p
Pb-Pb
Scope: PWG
PWG-JE (Jets)
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p-p
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p-p
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5.02 TeV
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p-p
Pb-Pb
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p-p
Pb-Pb
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p-p
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p-p
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p-p
Pb-Pb
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p-p
Pb-Pb
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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p-p
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