Proton and anti-proton production in the forward region of d+Au collisions at RHIC from the color glass condensate
arXiv:hep-ph/0604173 · doi:10.1016/j.nuclphysa.2006.06.005
Abstract
The power-law tail of high-pt pi^\pm spectra observed in forward d+Au collisions at RHIC can be attributed to the power-law decrease of the dipole forward scattering amplitude appearing in the color glass condensate (CGC) approach. Forward particle production probes the small-x gluon distribution of the target nucleus where its anomalous dimension is rather flat (gamma = 0.6 \sim 0.8) for moderately high pt (\lsim 5 GeV), and where the leading-twist DGLAP approximation is not valid. In the same framework, we examine p and \bar{p} production using baryon fragmentation functions parameterized in the Lund fragmentation scheme. This provides a good description of the forward \bar{p} spectrum while it underestimates the p data by as much as a factor of 2 \sim 3 at pt \lsim 4 GeV. Part of this anomalous baryon excess can be attributed to surviving constituent diquarks from the deuteron projectile. Thus, the contribution from diquark scattering may play an essential role for forward baryon formation.
arXiv comment20 pages, 5 figures
References in corpus (68)
- Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
- Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
- Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
- The PHOBOS Perspective on Discoveries at RHIC
- Computing Quark and Gluon Distribution Functions for Very Large Nuclei
- High-Energy-Physics Event Generation with PYTHIA 6.1
- Operator expansion for high-energy scattering
- Gluon Distribution Functions for Very Large Nuclei at Small Transverse Momentum
- Small-x F_2 Structure Function of a Nucleus Including Multiple Pomeron Exchanges
- Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
- Nonlinear Gluon Evolution in the Color Glass Condensate: I
- Saturation Effects in Deep Inelastic Scattering at low and its Implications on Diffraction
- The Wilson renormalization group for low x physics: towards the high density regime
- The BFKL Equation from the Wilson Renormalization Group
- Unitarization of the BFKL Pomeron on a Nucleus
- The Renormalization Group Equation for the Color Glass Condensate
- Saturation in Diffractive Deep Inelastic Scattering
- The Intrinsic Glue Distribution at Very Small x
- Fragmentation Functions for Pions, Kaons, and Protons at Next-to-Leading Order
- Saturation and BFKL dynamics in the HERA data at small x
- Non-Abelian Weizsacker-Williams field and a two-dimensional effective color charge density for a very large nucleus
- Manifestations of high density QCD in the first RHIC data
- A Modification of the Saturation Model: DGLAP evolution
- Saturation Physics and Deuteron--Gold Collisions at RHIC
- Gluon production in current-nucleus and nucleon-nucleus collisions in a quasi-classical approximation
- The Energy Dependence of the Saturation Momentum
- Evolution of the nuclear modification factors with rapidity and centrality in d+Au collisions at $\sqrt{s_{NN}} = 200 GeV
- Geometric Scaling above the Saturation Scale
- Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^- Annihilations
- Cronin Effect and High-p_T Suppression in pA Collisions
- The Color Glass Condensate and hadron production in the forward region
- High energy pA collisions in the color glass condensate approach II. Quark production
- High energy pA collisions in the color glass condensate approach I. Gluon production and the Cronin effect
- Can Gluons Trace Baryon Number?
- Quantum structure of the non-Abelian Weizsacker-Williams field for a very large nucleus
- Nuclear Modification Factor in d+Au Collisions: Onset of Suppression in the Color Glass Condensate
- Forward Quark Jets from Protons Shattering the Colored Glass
- Effect of Jet Quenching on High- Hadron Spectra in High-energy Nuclear Collisions
- Energy Dependence of the Cronin Effect from Non-Linear QCD Evolution
- Effective field theory for the small-x evolution
- How Protons Shatter Colored Glass
- Inclusive Two-Gluon and Valence Quark-Gluon Production in DIS and pA
- QCD Saturation and Deuteron-Nucleus Collisions
- New Scaling at High Energy DIS
- Photon production in high energy proton-nucleus collisions
- Breakdown of QCD factorization at large Feynman x
- Saturation and parton level Cronin effect: enhancement vs suppression of gluon production in p-A and A-A collisions
- Coherent QCD multiple scattering in proton-nucleus collisions
- Geometric scaling violations in the central rapidity region of d+Au collisions at RHIC
- Baryon Number Transport via Gluonic Junctions
- From DIS to proton-nucleus collisions in the Color Glass Condensate model
- RHIC-tested predictions for low- and high- hadron spectra in nearly central Pb+Pb collisions at the LHC
- Observations on dA scattering at forward rapidities
- Scattering of Gluons from the Color Glass Condensate
- Cronin effect and high-p_T suppression in the nuclear gluon distribution at small x
- Cronin effect vs. geometrical shadowing in d+Au collisions at RHIC
- Nuclear A-dependence near the Saturation Boundary
- Novel Mechanism of Nucleon Stopping in Heavy Ion Collisions
- Quantitative study of the violation of kt-factorization in hadroproduction of quarks at collider energies
- A perturbative QCD analysis of charged-particle distributions in hadronic and nuclear collisions
- Forward Production in d+Au Collisions by Parton Recombination
- Forward Rapidity Hadron Production in Deuteron Gold Collisions from Valence Quarks
- QCD in Nuclear Collisions
- Forward and midrapidity like-particle ratios from p+p collisions at sqrt(s)=200 GeV
- Has saturation physics been observed in deuteron-gold collisions at RHIC?
- Proton breakup in high-energy pA collisions from perturbative QCD
- Unintegrated CCFM parton distributions and pion production in proton-proton collisions at high energies
- CGC, QCD Saturation and RHIC data (Kharzeev-Levin-McLerran-Nardi point of view)