Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes: A case study towards TMD factorization at subleading twist

Alessandro Bacchetta, Giuseppe Bozzi, Miguel G. Echevarria, Cristian Pisano, Alexei Prokudin, Marco Radici

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We consider the azimuthal distribution of the final observed hadron in semi-inclusive deep-inelastic scattering and the lepton pair in the Drell-Yan process. In particular, we focus on the cos⁡ϕ modulation of the unpolarized cross section and on its dependence upon transverse momentum. At low transverse momentum, for these observables we propose a factorized expression based on tree-level approach and conjecture that the same formula is valid in transverse-momentum dependent (TMD) factorization when written in terms of subtracted TMD parton distributions. Our formula correctly matches with the collinear factorization results at high transverse momentum, solves a long-standing problem and is a necessary step towards the extension of the TMD factorization theorems up to the subleading twist.

Original languageEnglish (US)
Article number134850
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume797
DOIs
StatePublished - Oct 10 2019

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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