TY - JOUR
T1 - Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes
T2 - A case study towards TMD factorization at subleading twist
AU - Bacchetta, Alessandro
AU - Bozzi, Giuseppe
AU - Echevarria, Miguel G.
AU - Pisano, Cristian
AU - Prokudin, Alexei
AU - Radici, Marco
N1 - Funding Information:
We thank D. Boer and M. Diehl for useful discussions. This work is supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 647981 , 3DSPIN ). MGE is supported by the Marie Skłodowska-Curie grant GlueCore (grant agreement No. 793896 ). This work is supported by the U.S. Department of Energy under Contract No. DE-AC05-06OR23177 and within the TMD Collaboration framework, and by the National Science Foundation under Contract No. PHY-1623454 .
Publisher Copyright:
© 2019 The Author(s)
PY - 2019/10/10
Y1 - 2019/10/10
N2 - 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 cosϕ 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.
AB - 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 cosϕ 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.
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U2 - 10.1016/j.physletb.2019.134850
DO - 10.1016/j.physletb.2019.134850
M3 - Article
AN - SCOPUS:85070642949
SN - 0370-2693
VL - 797
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 134850
ER -