Neutral pion and $\eta$ meson production in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV

Abstract

Neutral pion and $\eta$ meson invariant differential yields were measured in non-single diffractive p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of ${\pi }^0$ and $\eta$ meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of $0.3<p_{\mathrm{T}}<20$ GeV/$c$ and $0.7<p_{\mathrm{T}}<20$ GeV/$c$, respectively. The measured $\eta$/${\pi }^0$ ratio increases with $p_{\mathrm{T}}$ and saturates for $p_{\mathrm{T}}>4$ GeV/$c$ at $0.483\pm 0.015_{\mathrm{stat}}\pm 0.015_{\mathrm{sys}}$. A deviation from $m_{\mathrm{T}}$ scaling is observed for $p_{\mathrm{T}}<2$ GeV/$c$. The measured $\eta$/${\pi }^0$ ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full $p_{\mathrm{T}}$ range. The measured $\eta$/${\pi }^0$ ratio at high $p_{\mathrm{T}}$ also agrees within uncertainties with measurements from nucleus-nucleus collisions. The ${\pi }^0$ and $\eta$ yields in p-Pb relative to the scaled pp interpolated reference, $R_{\mathrm{pPb}}$, are presented for $0.3<p_{\mathrm{T}}<20$ GeV/$c$ and $0.7<p_{\mathrm{T}}<20$ GeV/$c$, respectively. The results are compared with theoretical model calculations. The values of $R_{\mathrm{pPb}}$ are consistent with unity for transverse momenta above 2 GeV/$c$. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb-Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.

arXiv comment34 pages, 11 captioned figures, 5+1 tables, authors from page 29, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4156

References in corpus (71)

• An Introduction to PYTHIA 8.2
• New parton distribution functions from a global analysis of quantum chromodynamics
• Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at $sqrt {s sub {sub {NN}}}_ = 130 GeV
• Performance of the ALICE Experiment at the CERN LHC
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• HIJING 1.0: A Monte Carlo Program for Parton and Particle Production in High Energy Hadronic and Nuclear Collisions
• Long-range angular correlations on the near and away side in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Transverse momentum and collision energy dependence of high $p_T$ hadron suppression in Au+Au collisions at ultrarelativistic energies
• The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
• Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC
• Centrality dependence of high pT hadron suppression in Au+Au collisions at sqrt(sNN)=130 GeV
• nCTEQ15 - Global analysis of nuclear parton distributions with uncertainties in the CTEQ framework
• EPPS16: Nuclear parton distributions with LHC data
• Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Multiplicity Dependence of Pion, Kaon, Proton and Lambda Production in p-Pb Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Absence of Suppression in Particle Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d+Au Collisions
• Performance of the ALICE VZERO system
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Long-range angular correlations of $\pi$, K and p in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Nuclear parton distributions at next to leading order
• Performance of Wavelength-Shifting Fibers for the Mu2e Cosmic Ray Veto Detector
• AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks
• Global Analysis of Nuclear Parton Distributions
• Identified hadron spectra at large transverse momentum in p+p and d+Au collisions at \sqrts_NN = 200 GeV
• Parton-to-Pion Fragmentation Reloaded
• Direct photon production in Pb-Pb collisions at $\sqrt{s_\rm{NN}}$ = 2.76 TeV
• Charged-particle nuclear modification factors in PbPb and pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Measurement of neutral mesons in p+p collisions at sqrt(s) = 200 GeV and scaling properties of hadron production
• Transverse momentum distribution and nuclear modification factor of charged particles in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Analysing radial flow features in p-Pb and p-p collisions at several TeV by studying identified particle production in EPOS3
• Single inclusive particle production at high energy from HERA data to proton-nucleus collisions
• Multi-particle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
• Results from the Relativistic Heavy Ion Collider
• Next-to-leading order QCD corrections to high-p_T pion production in longitudinally polarized pp collisions
• Pseudorapidity density of charged particles in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Common Suppression Pattern of eta and pi^0 Mesons at High Transverse Momentum in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Centrality Dependence of pi^0 and eta Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d+Au Collisions
• Comparison of Jet Quenching Formalisms for a Quark-Gluon Plasma "Brick"
• Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 5.02 TeV
• Proton-Nucleus Collisions at the LHC: Scientific Opportunities and Requirements
• Impact-parameter dependent nuclear parton distribution functions: EPS09s and EKS98s and their applications in nuclear hard processes
• The Monte Carlo Event Generator DPMJET-III
• Color Glass Condensate and Glasma
• Measurement of charged jet suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Azimuthal correlations of heavy quarks in Pb+Pb collisions at LHC ($\sqrt{s}=2.76$ TeV)
• Parton-to-Kaon Fragmentation Revisited
• Collectivity and electromagnetic radiation in small systems
• Study of the production of charged pions, kaons, and protons in pPb collisions at sqrt(sNN) = 5.02 TeV
• High transverse momentum eta meson production in p+p, d+Au and Au+Au collisions at sqrt(s_NN) = 200 GeV
• Measurements of long-range near-side angular correlations in $\sqrt{s_{\text{NN}}}=5$TeV proton-lead collisions in the forward region
• Confronting current NLO parton fragmentation functions with inclusive charged-particle spectra at hadron colliders
• Transverse momentum, rapidity, and centrality dependence of inclusive charged-particle production in $\sqrt{s_{NN}}=5.02$ TeV p+Pb collisions measured by the ATLAS experiment
• Global Analysis of Fragmentation Functions for Eta Mesons
• On the combination of correlated estimates of a physics observable
• Fragmentations Functions in Nuclear Media
• An analysis of the impact of LHC Run I proton-lead data on nuclear parton densities
• Color Glass Condensate and Glasma
• Gluon shadowing and hadron production in heavy-ion collisions at LHC
• Production of ${\pi }^0$ and $\eta$ mesons up to high transverse momentum in pp collisions at 2.76 TeV
• Predictions for $p+$Pb Collisions at $\sqrt{s_{NN}}=5$ TeV: Comparison with Data
• Production of pizero and eta mesons at large transverse momenta in pp and pBe interactions at 530 and 800 GeV/c
• Jet Quenching in Heavy Ion Collisions
• Hard probes in heavy ion collisions at the LHC: PDFs, shadowing and $pA$ collisions
• Neutral pion and $\eta$ meson production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV
• Predictions on the transverse momentum spectra for charged particle production at LHC-energies from a two component model
• Meson spectra and m_T scaling in p+p, d+Au and Au+Au collisions at \sqrtS_NN=200 GeV
• ALICE EMCal Physics Performance Report
• CGC, QCD Saturation and RHIC data (Kharzeev-Levin-McLerran-Nardi point of view)
• Measurement of photons via conversion pairs in \sqrt{s_{NN}} = 200 GeV Au+Au collisions with the PHENIX experiment at RHIC

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