Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV

Abstract

The PHENIX experiment presents results from the RHIC 2006 run with polarized proton collisions at sqrt(s) = 62.4 GeV for inclusive pi^0 production at mid-rapidity. Unpolarized cross section results are measured for transverse momenta p_T = 0.5 to 7 GeV/c. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. Double helicity asymmetries A_LL are presented for p_T = 1 to 4 GeV/c and probe the higher range of Bjorken_x of the gluon (x_g) with better statistical precision than our previous measurements at sqrt(s)=200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06 < x_g < 0.4.

387 authors from 63 institutions, 10 pages, 6 figures, 1 table. Submitted to Physical Review D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

References in corpus (10)

• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• The Deuteron Spin-dependent Structure Function g1d and its First Moment
• Global Analysis of Helicity Parton Densities and Their Uncertainties
• Inclusive cross section and double helicity asymmetry for π^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton
• Longitudinal double-spin asymmetry and cross section for inclusive jet production in polarized proton collisions at sqrt(s) = 200 GeV
• Measurement of direct photon production in p + p collisions at sqrt(s) = 200 GeV
• Improved Measurement of Double Helicity Asymmetry in Inclusive Midrapidity pi^0 Production for Polarized p+p Collisions at sqrt(s)=200 GeV
• Single Transverse-Spin Asymmetry in Very Forward and Very Backward Neutral Particle Production for Polarized Proton Collisions at sqrt{s} = 200 GeV
• Single-Inclusive Hadron Production in Polarized pp Scattering at Next-to-Leading Logarithmic Accuracy
• Exploring the polarization of gluons in the nucleon

Cited by in corpus (76)

• The Spin Structure of the Nucleon
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• Parton Fragmentation Functions
• A perturbative framework for jet quenching
• Parton Distributions in Nucleons and Nuclei
• Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at $\sqrt{s}=200$ GeV
• J/$\psi$ production at high transverse momenta in p+p and Au+Au collisions at sqrt(s_{NN}) = 200 GeV
• 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
• Charged particle transverse momentum spectra in pp collisions at sqrt(s) = 0.9 and 7 TeV
• Inclusive double-helicity asymmetries in neutral pion and eta meson production in $\vec{p}+\vec{p}$ collisions at $\sqrt{s}=200$ GeV
• A Lattice Study of Quark and Glue Momenta and Angular Momenta in the Nucleon
• Hadron spectra in p+p collisions at RHIC and LHC energies
• Production of light-flavor hadrons in pp collisions at $\sqrt{s}$ = 7 and $\sqrt{s}$ = 13 TeV
• Physics of Gluon Helicity Contribution to Proton Spin
• Cross Section and Parity Violating Spin Asymmetries of W^+/- Boson Production in Polarized p+p Collisions at sqrt(s)=500 GeV
• Higher-Twist Dynamics in Large Transverse Momentum Hadron Production
• Leading-Order Determination of the Gluon Polarization from high-$p_T$ Hadron Electroproduction
• Systematic Analysis of the Non-extensive Statistical Approach in High Energy Particle Collisions - Experiment vs. Theory
• Longitudinal double-spin asymmetry for inclusive jet and dijet production in $pp$ collisions at $\sqrt{s}=510$ GeV
• Cross section and double helicity asymmetry for eta mesons and their comparison to neutral pion production in p+p collisions at sqrt(s)=200 GeV
• Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at Midrapidity
• Inclusive cross section and double-helicity asymmetry for ${\pi }^0$ production at midrapidity in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV
• Leading order determination of the gluon polarisation from DIS events with high-p_T hadron pairs
• Inclusive Hadron Production in the CERN-LHC Era
• Systematic analysis of hadron spectra in p+p collisions using Tsallis distribution
• Gluon Helicity Delta G from a Universality Class of Operators on a Lattice
• Understanding the proton's spin structure
• Evolution of pi^0 suppression in Au+Au collisions from sqrt(s_NN) = 39 to 200 GeV
• Next-to-next-to-leading order QCD analysis of spin-dependent parton distribution functions and their uncertainties: Jacobi polynomials approach
• Using the Tsallis distribution for hadron spectra in $pp$ collisions: Pions and quarkonia at $\sqrt{s}$ = 5--13000 GeV
• Conceptual design of the Spin Physics Detector
• Helicity Parton Distributions at a Future Electron-Ion Collider: A Quantitative Appraisal
• Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects
• Unveiling the Proton Spin Decomposition at a Future Electron-Ion Collider
• Measurement of the cross section and longitudinal double-spin asymmetry for di-jet production in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV
• Event Structure and Double Helicity Asymmetry in Jet Production from Polarized p+p Collisions at sqrt(s) = 200 GeV
• Threshold Resummation for Di-hadron Production in Hadronic Collisions
• Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at $\sqrt{s}=200$ GeV
• Application of the Non-extensive Statistical Approach to High Energy Particle Collisions
• Analysis of the double-spin asymmetry A_LT in inelastic nucleon-nucleon collisions
• Polarized Parton Distributions at an Electron-Ion Collider
• Hadron plus photon production in polarized hadronic collisions at next-to-leading order accuracy
• Longitudinal Double-Spin Asymmetries for Dijet Production at Intermediate Pseudorapidity in Polarized $pp$ Collisions at $\sqrt{s}$ = 200 GeV
• Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at $\sqrt{s_{{}_{NN}}}$ from 62.4 GeV to 2.76 TeV
• The proton spin puzzle: where are we today ?
• Next-to-leading order QCD corrections to hadron+jet production in pp collisions at RHIC
• Heavy-flavor electron-muon correlations in $p$$+$$p$ and $d$+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Thermal and hard scales in transverse momentum distributions, fluctuations and entanglement
• First Extraction of Transverse Momentum Dependent Helicity Distributions
• Double Spin Asymmetry of Electrons from Heavy Flavor Decays in p+p Collisions at sqrt(s)=200 GeV
• Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+p collisions at sqrt(s)=62.4 GeV
• Measurement of the Cross Section for High-p_T Hadron Production in Scattering of 160 GeV/c Muons off Nucleons
• Next-to-Leading Order QCD Corrections to Heavy Quark Correlations in Longitudinally Polarized Hadron-Hadron Collisions
• Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in $p+p$ collisions at $\sqrt{s}=200$ GeV
• Measurement of charm and bottom production from semileptonic hadron decays in $p$$+$$p$ collisions at $\sqrt{s_{NN}}=200$ GeV
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• Quark and Glue Components of the Proton Spin from Lattice Calculation
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• The twist-3 gluon contribution to Sivers asymmetry in $J/\psi$ production in semi-inclusive deep inelastic scattering
• Effect of sea quarks on the single-spin asymmetries $A_L^{W^{\pm }}$ in polarized pp collisions at RHIC
• Precision measurement of the longitudinal double-spin asymmetry for dijet production at intermediate pseudorapidity in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV
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• Multisource thermal model to the transverse momentum spectra in pp collisions at RHIC and LHC energies
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