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

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

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factorization
transverse momentum
asymmetry
partons
leptons
inelastic scattering
theorems
modulation
cross sections

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

@article{dc9c450dba6b4c0e974423a368e00569,
title = "Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes: A case study towards TMD factorization at subleading twist",
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.",
author = "Alessandro Bacchetta and Giuseppe Bozzi and Echevarria, {Miguel G.} and Cristian Pisano and Alexei Prokudin and Marco Radici",
year = "2019",
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language = "English (US)",
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journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
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Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes : A case study towards TMD factorization at subleading twist. / Bacchetta, Alessandro; Bozzi, Giuseppe; Echevarria, Miguel G.; Pisano, Cristian; Prokudin, Alexei; Radici, Marco.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 797, 134850, 10.10.2019.

Research output: Contribution to journalArticle

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

PY - 2019/10/10

Y1 - 2019/10/10

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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 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.

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