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Volume 346 - 23rd International Spin Physics Symposium (SPIN2018) - Parallel Session: Structure of the Nucleon: TMDs (A. Bacchetta, J. Drachenberg and B. Parsamyan)
Difficulties in the description of Drell-Yan processes at low invariant mass and high transverse momentum
F. Piacenza,* A. Bacchetta, G. Bozzi, M. Lambertsen, J. Steiglechner, W. Vogelsang
*corresponding author
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Pre-published on: 2019 August 19
Published on: 2019 August 23
We study the Drell-Yan cross section differential with respect to the transverse momentum of the produced lepton pair. We consider data with
moderate invariant mass $Q$ of the lepton pair, between 4.5 GeV and 13.5 GeV, and similar (although slightly smaller) values of the transverse momentum $q_T$. We approach the problem by deriving predictions based on standard collinear factorization, which are expected to
be valid toward the high-$q_T$ end of the spectrum and to which any description of the spectrum at lower $q_T$
based on transverse-momentum dependent parton distributions ultimately needs to be matched. We find that the collinear framework
predicts cross sections that in most cases are significantly below available data at high $q_T$. We discuss additional perturbative and
possible non-perturbative effects that increase the predicted cross section, but not by a sufficient amount.
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