Forward Neutral Pion Production in p+p and d+Au Collisions at sqrt(s_NN)=200 GeV

Abstract

Measurements of the production of forward pi0 mesons from p+p and d+Au collisions at sqrt(s_NN)=200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as eta increases, decreasing to ~30% of the p+p yield at <eta>=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward pi0 with charged hadrons at eta~0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.

arXiv comment6 pages, 4 figures. Minor changes from review process in Phys. Rev. Lett. Plain text tables of data in STAR publications may be found at http://www.star.bnl.gov/central/publications

References in corpus (34)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• High-Energy-Physics Event Generation with PYTHIA 6.1
• Gluon Distribution Functions for Very Large Nuclei at Small Transverse Momentum
• New Forms of QCD Matter Discovered at RHIC
• Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC
• Deep-Inelastic Inclusive ep Scattering at Low x and a Determination of alpha_s
• Measurement of the neutral current cross section and F2 structure function for deep inelastic e+p scattering at HERA
• Evolution of the nuclear modification factors with rapidity and centrality in d+Au collisions at $\sqrt{s_{NN}} = 200 GeV
• Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^- Annihilations
• Cronin Effect and High-p_T Suppression in pA Collisions
• Transverse Momentum Spectra in Au+Au and d+Au Collisions at $\sqrt{s_{NN}}$=200 GeV and the Pseudorapidity Dependence of High p${}_T$ Suppression
• The Color Glass Condensate and hadron production in the forward region
• Mid-Rapidity Neutral Pion Production in Proton-Proto Collisions at sqrt(s_NN) = 200 GeV
• Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV
• Relating high-energy lepton-hadron, proton-nucleus and nucleus-nucleus collisions through geometric scaling
• Nuclear Modification Factor in d+Au Collisions: Onset of Suppression in the Color Glass Condensate
• Next-to-leading order QCD corrections to high-p_T pion production in longitudinally polarized pp collisions
• Forward Quark Jets from Protons Shattering the Colored Glass
• Testing the Universality of Fragmentation Functions
• Nuclear parton distribution functions and their uncertainties
• Breakdown of QCD factorization at large Feynman x
• Coherent QCD multiple scattering in proton-nucleus collisions
• Measurement of Dijet Azimuthal Decorrelations at Central Rapidities in pp-bar Collisions at sqrt(s)=1.96 TeV
• Resummed QCD Power Corrections to Nuclear Shadowing
• Jet Azimuthal Correlations and Parton Saturation in the Color Glass Condensate
• Observations on dA scattering at forward rapidities
• Cronin effect and high-p_T suppression in the nuclear gluon distribution at small x
• Next-to-leading order QCD corrections to one hadron-production in polarized pp collisions at RHIC
• Forward Production in d+Au Collisions by Parton Recombination
• Forward Rapidity Hadron Production in Deuteron Gold Collisions from Valence Quarks
• Breaking of k_\perp-factorization for Single Jet Production off Nuclei
• Do we understand the single-spin asymmetry for $p{i}^0$ inclusive production in pp collisions?
• Shadowing Effects on the Nuclear Suppression Factor, R_dAu, in d+Au Interactions
• Important experimental observables at RHIC

Cited by in corpus (127)

• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• AKK Update: Improvements from New Theoretical Input and Experimental Data
• Global Analysis of Nuclear Parton Distributions
• Parton-to-Pion Fragmentation Reloaded
• Gluon saturation and initial conditions for relativistic heavy ion collisions
• Single inclusive particle production at high energy from HERA data to proton-nucleus collisions
• Forward inclusive dijet production and azimuthal correlations in pA collisions
• Inclusive Hadron Productions in pA Collisions
• Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron
• Azimuthal correlations of forward di-hadrons in d+Au collisions at RHIC in the Color Glass Condensate
• Single transverse-spin asymmetry in high transverse momentum pion production in pp collisions
• CGC predictions for p+Pb collisions at the LHC
• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• Single Inclusive Hadron Production at RHIC and the LHC from the Color Glass Condensate
• Forward Neutral Pion Transverse Single Spin Asymmetries in p+p Collisions at \sqrt{s}=200 GeV
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• Non-Abelian energy loss in cold nuclear matter
• Impact-parameter dependent nuclear parton distribution functions: EPS09s and EKS98s and their applications in nuclear hard processes
• Centrality and rapidity dependence of inclusive jet production in $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV proton-lead collisions with the ATLAS detector
• QCD saturation at the LHC: comparisons of models to p+p and A+A data and predictions for p+Pb collisions
• Suppression of back-to-back hadron pairs at forward rapidity in d+Au Collisions at sqrt(s_NN)=200 GeV
• Forward dihadron correlations in deuteron-gold collisions with a Gaussian approximation of JIMWLK
• Exclusive diffractive processes in electron-ion collisions
• Particle Production at High Energy and Large Transverse Momentum - "The Hybrid Formalism" Revisited
• CGC predictions for p+A collisions at the LHC and signature of QCD saturation
• Towards the Test of Saturation Physics Beyond Leading Logarithm
• Prompt photon production and photon-hadron correlations at RHIC and the LHC from the Color Glass Condensate
• Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Transverse Single-Spin Asymmetry and Cross-Section for pi0 and eta Mesons at Large Feynman-x in Polarized p+p Collisions at sqrt(s)=200 GeV
• Implementing the exact kinematical constraint in the saturation formalism
• Probing Gluon Saturation through Dihadron Correlations at an Electron-Ion Collider
• Nuclear modification of high transverse momentum particle production in p+A collisions at RHIC and LHC
• Universality of multi-particle production in QCD at high energies
• The Present and Future of QCD
• Two Particle Correlations at Forward Rapidity in STAR
• Matching Collinear and Small-x Factorization Calculations for Inclusive Hadron Production in pA Collisions
• A possible determination of the quark radiation length in cold nuclear matter
• Geometric Scaling at RHIC and LHC
• Hadron production in pA collisions at the LHC from the Color Glass Condensate
• Multiple parton interactions and forward double pion production in pp and dA scattering
• The hadronization of partons
• Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at sqrt(s) = 200 GeV
• Inclusive pi^0, eta, and direct photon production at high transverse momentum in p+p and d+Au collisions at sqrt(s_NN) = 200 GeV
• Single Spin Asymmetry Scaling in the Forward Rapidity Region at RHIC
• Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at sqrt{s} = 200 GeV
• Gluon splitting in a shockwave
• Pursuing the Precision Study for Color Glass Condensate in Forward Hadron Productions
• Measurement of Single Muons at Forward Rapidity in p+p Collisions at sqrt(s) = 200 GeV and Implications for Charm Production
• The initial state of heavy-ion collisions
• Threshold Resummation for Di-hadron Production in Hadronic Collisions
• Radiative jet energy loss in a three-dimensional hydrodynamical medium and high $p_T$ azimuthal asymmetry of ${\pi }_0$ suppression at mid and forward rapidity at RHIC
• Isolated photon production in proton-nucleus collisions at forward rapidity
• Rapidity and centrality dependence of azimuthal correlations in Deuteron-Gold collisions at RHIC
• Transverse momentum distribution and nuclear modification factor of forward neutral pion in proton--lead collisions at $\sqrt{s_{NN}}=5.02$TeV
• (medium-modified) Fragmentation Functions
• Sivers asymmetry of Drell-Yan production in small-$x$ regime
• Evidence for Nonlinear Gluon Effects in QCD and their $A$ Dependence at STAR
• Nuclear-modification factor of charged hadrons at forward and backward rapidity in $p$$+$Al and $p$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Threshold Resummation for Hadron Production in the Small-$x$ Region
• Single spin asymmetries in inclusive hadron production from SIDIS to hadronic collisions: universality and phenomenology
• Saturation and forward jets in proton-lead collisions at the LHC
• Predictions for the LHC heavy ion programme
• Forward particle productions at RHIC and the LHC from CGC within local rcBK evolution
• Study of Nuclear Suppression at Large Forward Rapidities in d-Au Collisions at Relativistic and Ultrarelativistic Energies
• Testing the Gaussian Approximation to the JIMWLK Equation
• Saturation in inclusive production beyond leading logarithm accuracy
• Comparison of transverse single-spin asymmetries for forward ${\pi }^0$ production in polarized $pp$, $p\mathrm{Al}$ and $p\mathrm{Au}$ collisions at nucleon pair c.m. energy $\sqrt{s_{\mathrm{NN}}}=200$ GeV
• Forward Inclusive Jet Productions in pA Collisions
• Nuclear effects in Drell-Yan pair production in high-energy $pA$ collisions
• Final state interactions and hadron quenching in cold nuclear matter
• NLO Semi-inclusive Drell-Yan cross-section in Quantum ChromoDynamics as a Factorization Analyzer
• Unitarity bound for gluon shadowing
• On the rapidity dependence of the average transverse momentum in hadronic collisions
• Exploring the polarization of gluons in the nucleon
• Probing High Parton Densities at Low-$x$ in d+Au Collisions at PHENIX Using the New Forward and Backward Muon Piston Calorimeters
• Paramaterizations of inclusive cross sections for pion production in proton-proton collisions. II. Comparison to new data
• Ultra-forward particle production from CGC+Lund fragmentation
• Prompt photon production in high-energy $pA$ collisions at forward rapidity
• Inclusive hadron and photon production at LHC in dipole momentum space
• Azimuthal correlations within exclusive dijets with large momentum transfer in photon-lead collisions
• Looking forward for Color Glass Condensate signatures
• QCD at small x and nucleus-nucleus collisions
• Complete Next-to-Leading Order Calculation of Single Inclusive ${\pi }^0$ Production in Forward Proton-Nucleus Collisions
• Forward dihadron correlations in the Gaussian approximation of JIMWLK
• CGC and initial state effects in Heavy Ion Collisions
• Single and double inclusive particle production in d+Au collisions at RHIC, leading twist and beyond
• Anomalous pion production induced by nontrivial topological structure of QCD vacuum
• Vector meson photoproduction in UPCs with FoCal
• A heuristic description of high-pT hadron production in heavy ion collisions
• Forward Hadron Productions in high energy pp collisions from a Monte-Carlo generator for Color Glass Condensate
• Investigating the broadening phenomenon in two-particle correlations induced by gluon saturation
• Successes and failures with hard probes
• The Emerging QCD Frontier: The Electron Ion Collider
• Single-inclusive hadron production in transversely polarized p-p and pbar-p collisions with threshold resummation
• Color Glass Condensate meets High Twist Expansion
• Scaled momentum distributions for K0s and Lambda/bar Lambda in DIS at HERA
• Small-x Physics with the ALICE experiment at the CERN-LHC
• Description of di-hadron saturation signals within a universal nuclear parton distribution function approach
• Global extraction of the parton-to-pion fragmentation functions at NLO accuracy in QCD
• ALICE detector upgrades
• Pseudo-rapidity Distributions of Charged Hadrons in pp and pA Collisions at the LHC
• Review of Recent Developments in the CGC
• Rapidity dependence of azimuthal correlations for p+p and d+Au at $\sqrt{s}=200$GeV
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Cold nuclear matter physics at forward rapidities from d+Au collisions in PHENIX
• Momentum space saturation model for deep inelastic scattering and single inclusive hadron production
• Particle Production in the Color Class Condensate: from electron-proton DIS to proton-nucleus collisions
• Azimuthal angle and rapidity dependence of di-hadron correlations in QCD
• Particle production from the Color Glass Condensate: proton-nucleus collisions in light of the HERA data
• Recent Results from RHIC & Some Lessons for Cosmic-Ray Physicists
• Azimuthal correlations of forward dijets in d+Au collisions at RHIC
• Forward jet-like event spin-dependent properties in polarized p+p collisions at $\sqrt{s}$=200 GeV
• Transverse Single Spin Asymmetries in Hadronic Interactions: an experimental overview and outlook
• Predictions for photon-jet correlations at forward rapidities in heavy-ion collisions
• Physics of Large-x Nuclear Suppression
• Quenching of high-pT hadrons: a non-energy-loss scenario
• The Search for Gluon Saturation in pA Collisions
• Gluon Polarization in Longitudinally Polarized $pp$ Collisions at STAR
• Nuclear Suppression of Dileptons at Large xF
• Double Helicity Asymmetries of Forward Neutral Pions from $\sqrt{s}=510$ GeV $pp$ Collisions at STAR
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering
• Nuclear suppression of dileptons at forward rapidities
• Leading twist shadowing, black disk regime and forward hadron production
• Dependence of Single Particle Distributions on Rapidity and Centrality in d+Au Collisions at \snn = 200 GeV
• Rapidity and centrality dependence of azimuthal correlations in high energy d+Au collisions