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Richard Corke, Torbjörn Sjöstrand
Multiparton Interactions with an x-dependent Proton Size
Abstract
Theoretical arguments, supported by other indirect evidence, suggest that
the wave function of high-x partons should be narrower than that of low-x
ones. In this article, we present a modification to the variable impact
parameter framework of Pythia 8 to model this effect. In particular, a
Gaussian hadronic matter profile is introduced, with a width dependent on
the x value of the constituent being probed. Results are compared against
the default single- and double-Gaussian profiles, as well as an
intermediate overlap function.
LU TP 11-06
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