AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks

By J. Albacete, N. Armesto, J. G. Milhano, Paloma Quiroga Arias, C. Salgado. 2010

267 citations recorded by the source corpus.

We present a global analysis of available data on inclusive structure functions and reduced cross sections measured in electron–proton scattering at small values of Bjorken-x, x<0.01, including the latest data from HERA on reduced cross sections. Our approach relies on the dipole formulation of DIS together with the use of the non-linear running coupling Balitsky–Kovchegov equation for the description of the small-x dynamics. We improve our previous studies by including the heavy quark (charm and beauty) contribution to the reduced cross sections, and also by considering a variable flavor scheme for the running of the coupling. We obtain a good description of the data, with the fit parameters remaining stable with respect to our previous analyses where only light quarks were considered. The inclusion of the heavy quark contributions resulted in a good description of available experimental data for the charm component of the structure function and reduced cross section provided the initial transverse distribution of heavy quarks was allowed to differ from (more specifically, to have a smaller radius than) that of the light flavors.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bd2979174a496fdb5670b19cdd1ed619fe2bc8bc

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In Nuclear and High Energy Physics

Citations in the corpus

Collinearly-improved BK evolution meets the HERA data (2015, methodology): “For the explicit expression of the strong coupling in coordinate space in terms of r we introduce a fudge factor as in [22], namely”
The Structure of the Proton in the LHC Precision Era (2017, result): “We also note that small–x predictions based on non–linear effects [603, 604] (‘saturation’) have typically the opposite trend to small–x resummation, suppressing the structure functions in comparison to the NNLO fixed–order calculation.”
Heavy-quarkonium suppression in p-A collisions from parton energy loss in cold QCD matter (2012, result): “Comparing the value of q̂0 obtained in our model from a fit to the E866 J/ψ nuclear suppression data and the current estimates of Q(2)s0 obtained from a fit to small-x2 DIS data [50] should provide a non-trivial (though not conclusive) test of our model.”