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Strong constraints on jet quenching in centrality-dependent p+Pb collisions at 5.02 TeV from ATLAS
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Strong constraints on jet quenching in centrality-dependent p+Pb collisions at 5.02 TeV from ATLAS
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Jet quenching is the process of color-charged partons losing energy via interactions with quark-gluon plasma droplets created in heavy-ion collisions. The collective expansion of such droplets is well described by viscous hydrodynamics. Similar evidence of collectivity is consistently observed in smaller collision systems, including $pp$ and $p$+Pb collisions. In contrast, while jet quenching is observed in Pb+Pb collisions, no evidence has been found in these small systems to date, raising fundamental questions about the nature of the system created in these collisions. The ATLAS experiment at the Large Hadron Collider has measured the yield of charged hadrons correlated with reconstructed jets in 0.36 nb$^{-1}$ of $p$+Pb and 3.6 pb$^{-1}$ of $pp$ collisions at 5.02 TeV. The yields of charged hadrons with $p_\mathrm{T}^\mathrm{ch} >0.5$ GeV near and opposite in azimuth to jets with $p_\mathrm{T}^\mathrm{jet} > 30$ or $60$ GeV, and the ratios of these yields between $p$+Pb and $pp$ collisions, $I_{p\mathrm{Pb}}$, are reported. The collision centrality of $p$+Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The $I_{p\mathrm{Pb}}$ values are consistent with unity within a few percent for hadrons with $p_\mathrm{T}^\mathrm{ch} >4$ GeV at all centralities. These data provide new, strong constraints which preclude almost any parton energy loss in central $p$+Pb collisions.
Forward citations
Cited by 9 Pith papers
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System-size dependence of charged-particle suppression in ultrarelativistic nucleus-nucleus collisions
First neon-neon R_AA measurement shows charged-particle suppression increasing monotonically with nuclear size across oxygen, neon, xenon, and lead at LHC energies.
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ATLAS observes increasing dijet imbalance with centrality in O+O and Ne+Ne collisions at 5.36 TeV, consistent with medium-induced energy loss in small systems.
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Measurements of jet quenching with semi-inclusive hadron-jet correlations in Ru+Ru and Zr+Zr collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV
First semi-inclusive hadron-jet measurement in Ru+Ru and Zr+Zr at 200 GeV finds recoil-jet suppression and intra-jet broadening in central relative to peripheral collisions.
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Measurement of jet quenching in O+O collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV by the STAR experiment at RHIC
STAR reports 20% suppression of recoiling hadrons and jets in high-event-activity O+O collisions at 200 GeV, with a measured 0.7 GeV/c pT shift for large-radius jets, providing evidence for jet quenching in small systems.
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Momentum Broadening in the Opacity Expansion: All-Path-Length Corrections and Improved Regge Kinematics
Combined short-path-length (APL) and sub-eikonal corrections to GLV momentum broadening nearly cancel, restoring the standard GLV result; the paper argues this may resolve the earlier large negative APL energy-loss co...
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Measurements of jet quenching with semi-inclusive hadron-jet correlations in Ru+Ru and Zr+Zr collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV
Suppression of recoil jet yields and intra-jet broadening is observed in central Ru+Ru and Zr+Zr collisions, indicating medium-induced partonic energy loss.
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Geometric Bias and Centrality Dependence of Jet Quenching in High-Energy Nuclear Collisions
A refined HIJING initial-condition model with geometric bias from impact-parameter effects, combined with Boltzmann jet transport, describes the centrality dependence of charged-hadron suppression in 5.02 TeV Pb+Pb co...
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Geometric Bias and Centrality Dependence of Jet Quenching in High-Energy Nuclear Collisions
Suppression of high-pT hadrons in peripheral Pb+Pb collisions is predominantly driven by initial-state geometric bias rather than final-state jet quenching.
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Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in $p$+Pb collisions
Dijet-tagged p+Pb collisions at 8.16 TeV show that Pb-going FCal transverse energy is approximately six times more sensitive to proton Bjorken-x than ZDC energy deposition.
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