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arXiv · 1009.6123

Multiple parton interactions and forward double pion production in pp and dA scattering

Mark Strikman·Werner Vogelsang
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Abstract

We estimate the contributions by double-parton interactions to the cross sections for pp->pi^0 pi^0 X and dA->pi^0 pi^0 X at RHIC. We find that such contributions become important at large forward rapidities of the produced pions. This is in particular the case for dA scattering, where they strongly enhance the azimuthal-angular independent "pedestal" component of the cross section, providing a natural explanation of this feature of the RHIC dA data. We argue that the discussed processes open a window to studies of double quark distributions in nucleons. We also briefly address the roles of shadowing and energy loss in dA scattering, which we show to affect the double-inclusive pion cross section much more strongly than the single-inclusive one. We discuss the implications of our results for the interpretation of pion azimuthal correlations.

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Mark Strikman, Werner Vogelsang. 2010-09-30. Multiple parton interactions and forward double pion production in pp and dA scattering. https://doi.org/10.1103/physrevd.83.034029

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