An Improved global analysis of nuclear parton distribution functions including RHIC data
By K. Eskola, H. Paukkunen, C. Salgado. 2008
159 citations recorded by the source corpus.
We present an improved leading-order global DGLAP analysis of nuclear parton distribution functions (nPDFs), supplementing the traditionally used data from deep inelastic lepton-nucleus scattering and Drell-Yan dilepton production in proton-nucleus collisions, with inclusive high-pT hadron production data measured at RHIC in d+Au collisions. With the help of an extended definition of the χ2 function, we now can more efficiently exploit the constraints the different data sets offer, for gluon shadowing in particular, and account for the overall data normalization uncertainties during the automated χ2 minimization. The very good simultaneous fit to the nuclear hard process data used demonstrates the feasibility of a universal set of nPDFs, but also limitations become visible. The high-pT forward-rapidity hadron data of BRAHMS add a new crucial constraint into the analysis by offering a direct probe for the nuclear gluon distributions—a sector in the nPDFs which has traditionally been very badly constrained. We obtain a strikingly stronger gluon shadowing than what has been estimated in previous global analyses. The obtained nPDFs are released as a parametrization called EPS08.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/08fbee96a22fe93d78c1b40bd1adf79f3a96d4dd
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In Nuclear and High Energy Physics
- J. Lansberg
- J. Stachel
- R. Rapp
- F. Arleo
- S. Peigné
- Alexander Rothkopf
- A. Andronic
- Alice Collaboration
Citations in the corpus
- Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions (2015, methodology): “The AB-MSTW08 curve, corresponding to the absence of nuclear effect in that model, and the AB-EPS08 model, corresponding to strong shadowing, are both disfavoured.”
- EPS09: A New Generation of NLO and LO Nuclear Parton Distribution Functions (2009, methodology): “In this work we define the global χ2 by [4, 9]”