skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at $$$$\sqrt{s_{\mathrm{NN}}}=2.76$$$$ TeV

Journal Article · · Journal of High Energy Physics (Online)
 [1]
  1. Czech Technical University in Prague (Czech Republic). Faculty of Nuclear Sciences and Physical Engineering. et al.

We report the measurement of a new observable of jet quenching in central Pb-Pb collisions at √sNN = 2.76 TeV, based on the semi-inclusive rate of charged jets recoiling from a high transverse momentum (high-pT) charged hadron trigger. Jets are measured using collinear-safe jet reconstruction with infrared cutoff for jet constituents of 0.15 GeV, for jet resolution parameters R = 0.2, 0.4 and 0.5. Underlying event background is corrected at the event-ensemble level, without imposing bias on the jet population. Recoil jet spectra are reported in the range 20 < pT,jetch < 100 GeV. Reference distributions for pp collisions at √s = 2.76TeV are calculated using Monte Carlo and NLO pQCD methods, which are validated by comparing with measurements in pp collisions at √s = 7TeV. The recoil jet yield in central Pb-Pb collisions is found to be suppressed relative to that in pp collisions. No significant medium-induced broadening of the intra-jet energy profile is observed within 0.5 radians relative to the recoil jet axis. The angular distribution of the recoil jet yield relative to the trigger axis is found to be similar in central Pb-Pb and pp collisions, with no significant medium-induced acoplanarity observed. Lastly, large-angle jet deflection, which may provide a direct probe of the nature of the quasi-particles in hot QCD matter, is explored.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
The ALICE collaboration
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1339377
Journal Information:
Journal of High Energy Physics (Online), Vol. 2015, Issue 9; ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English

References (66)

SVD approach to data unfolding
  • Höcker, Andreas; Kartvelishvili, Vakhtang
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 372, Issue 3 https://doi.org/10.1016/0168-9002(95)01478-0
journal April 1996
Jet quenching pattern at LHC in PYQUEN model journal May 2011
Dihadron Tomography of High-Energy Nuclear Collisions in Next-to-Leading Order Perturbative QCD journal May 2007
The anti- k t jet clustering algorithm journal April 2008
Study of high-p T charged particle suppression in PbPb compared to pp collisions at $\sqrt{s_{\mathrm{NN}}}=2.76~\mathrm{TeV}$ journal March 2012
Performance of the ALICE experiment at the CERN LHC journal September 2014
Non-perturbative QCD effects in jets at hadron colliders journal February 2008
Studies of jet quenching using isolated-photon+jet correlations in PbPb and pp collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math> journal January 2013
High transverse momentum suppression and surface effects in Cu+Cu and Au+Au collisions within the PQM model journal October 2006
Leading-particle suppression in high energy nucleus-nucleus collisions journal January 2005
Jet quenching journal March 2003
ALICE: Physics Performance Report, Volume II journal September 2006
PYTHIA 6.4 physics and manual journal May 2006
FastJet user manual: (for version 3.0.2) journal March 2012
Disappearance of Back-To-Back High- p T Hadron Correlations in Central A u + A u Collisions at s N N = 200 G e V journal February 2003
Modification of jet shapes in PbPb collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math> journal March 2014
Particle-Yield Modification in Jetlike Azimuthal Dihadron Correlations in Pb-Pb Collisions at s NN = 2.76 TeV journal March 2012
The fragility of high- hadron spectra as a hard probe journal January 2005
Transverse-Momentum and Collision-Energy Dependence of High- p T Hadron Suppression in A u + A u Collisions at Ultrarelativistic Energies journal October 2003
A multidimensional unfolding method based on Bayes' theorem journal August 1995
Background fluctuations in heavy ion jet reconstruction journal April 2011
Picturing perturbative parton cascades in QCD matter journal January 2015
Data-driven analysis methods for the measurement of reconstructed jets in heavy ion collisions at RHIC and LHC journal August 2013
A simple description of jet cross-section ratios journal March 2011
Transition in Yield and Azimuthal Shape Modification in Dihadron Correlations in Relativistic Heavy Ion Collisions journal June 2010
Small-radius jets to all orders in QCD journal April 2015
Measurement of the jet radius and transverse momentum dependence of inclusive jet suppression in lead–lead collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> with the ATLAS detector journal February 2013
Direct Observation of Dijets in Central Au + Au Collisions at s N N = 200 GeV journal October 2006
Confronting current NLO parton fragmentation functions with inclusive charged-particle spectra at hadron colliders journal June 2014
Measurement of the inclusive differential jet cross section in pp collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> journal May 2013
Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at $\sqrt{s_{NN}}= 2.76\ \mbox{TeV}$ journal May 2012
Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math> journal March 2013
Inclusive distribution of fully reconstructed jets in heavy ion collisions at RHIC: Status report conference January 2012
Centrality Dependence of High- p T Hadron Suppression in A u + A u Collisions at s N N = 130 G e V journal October 2002
The catchment area of jets journal April 2008
Azimuthal Anisotropy of Charged Particles at High Transverse Momenta in Pb-Pb Collisions at s N N = 2.76 TeV journal July 2012
The performance of the jet identification and reconstruction in heavy ions collisions with CMS detector journal February 2007
Medium Modification of γ Jets in High-Energy Heavy-Ion Collisions journal August 2013
The theory and phenomenology of perturbative QCD based jet quenching journal January 2011
Energy dependence of the dijet imbalance in Pb-Pb collisions at 2.76 A TeV journal December 2012
Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb–Pb collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> journal February 2013
Calculating Track-Based Observables for the LHC journal September 2013
Jet momentum dependence of jet quenching in PbPb collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> journal June 2012
Observation and studies of jet quenching in PbPb collisions at s N N = 2.76 TeV journal August 2011
Neutral pion production with respect to centrality and reaction plane in Au+Au collisions at s NN = 200 GeV journal March 2013
Measurement of jet suppression in central Pb–Pb collisions at s NN = 2.76 TeV journal June 2015
Pileup subtraction using jet areas journal January 2008
Medium-evolved fragmentation functions journal February 2008
Medium Modification of Jet Fragmentation in Au + Au Collisions at s N N = 200 GeV Measured in Direct Photon-Hadron Correlations journal July 2013
Charged jet cross sections and properties in proton-proton collisions at s = 7 TeV journal June 2015
Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at s NN = 2.76 TeV with the ATLAS Detector at the LHC journal December 2010
Measurements of the Nuclear Modification Factor for Jets in Pb + Pb Collisions at s NN = 2.76 TeV with the ATLAS Detector journal February 2015
Momentum broadening in weakly coupled quark-gluon plasma (with a view to finding the quasiparticles within liquid quark-gluon plasma) journal May 2013
Jet-Hadron Correlations in s NN = 200 GeV p + p and Central Au + Au Collisions journal March 2014
Medium-evolved fragmentation functions text January 2007
The theory and phenomenology of perturbative QCD based jet quenching text January 2010
Background Fluctuations in Heavy Ion Jet Reconstruction text January 2010
A simple description of jet cross-section ratios text January 2011
Inclusive Distribution of Fully Reconstructed Jets in Heavy Ion Collisions at RHIC: Status Report text January 2011
Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at sqrt(s[NN]) = 2.76 TeV text January 2012
Data-driven analysis methods for the measurement of reconstructed jets in heavy ion collisions at RHIC and LHC preprint January 2012
Momentum Broadening in Weakly Coupled Quark-Gluon Plasma (with a view to finding the quasiparticles within liquid quark-gluon plasma) text January 2012
Confronting current NLO parton fragmentation functions with inclusive charged-particle spectra at hadron colliders text January 2013
Performance of the ALICE Experiment at the CERN LHC text January 2014
Picturing perturbative parton cascades in QCD matter text January 2014
The Fragility of High-pT Hadron Spectra as a Hard Probe text January 2004

Cited By (5)

Measurements of jet quenching with semi-inclusive hadron+jet distributions in Au + Au collisions at s N N = 200 GeV journal August 2017
Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at s N N = 2.76 TeV journal September 2017
Novel subjet observables for jet quenching in heavy-ion collisions journal June 2018
Correlations of High-pT Hadrons and Jets in ALICE journal May 2019
Factorization of Jet Cross Sections in Heavy-Ion Collisions text January 2019