### 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 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.

Original language | English (US) |
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Article number | 134850 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 797 |

DOIs | |

State | Published - Oct 10 2019 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

### Cite this

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*797*, [134850]. https://doi.org/10.1016/j.physletb.2019.134850

}

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 797, 134850. https://doi.org/10.1016/j.physletb.2019.134850

**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.

Research output: Contribution to journal › Article

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

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.

UR - http://www.scopus.com/inward/record.url?scp=85070642949&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85070642949&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2019.134850

DO - 10.1016/j.physletb.2019.134850

M3 - Article

AN - SCOPUS:85070642949

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

SN - 0370-2693

M1 - 134850

ER -