Strong Constraints on Jet Quenching in Centrality-Dependent p + Pb Collisions at 5.02 TeV from ATLAS
Journal Article
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· Physical Review Letters
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- Centre National de la Recherche Scientifique (CNRS), Marseille (France). Centre de Physique des Particules de Marseille (CPPM), Institut National de Physique Nucleaire et de Physique des Particules (IN2P3); Aix-Marseille Université (France); The ATLAS Collaboration. et al.
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 p p 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 $${p}^{ch}_{T}$$ > 0.5 GeV near and opposite in azimuth to jets with $${p}^{jet}_{T}$$ > 30 or 60 GeV, and the ratios of these yields between p + Pb and pp collisions, IpPb, are reported. The collision centrality of p + Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The IpPb values are consistent with unity within a few percent for hadrons with $${p}^{ch}_{T}$$ > 4 GeV at all centralities. These data provide new, strong constraints that preclude almost any parton energy loss in central p + Pb collisions.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231; FG02-03ER41244
- OSTI ID:
- 2281835
- Alternate ID(s):
- OSTI ID: 2342138
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 131; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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