A phenomenological analysis of azimuthal asymmetries in unpolarized semi-inclusive deep inelastic scattering

Abstract

We present a phenomenological analysis of the cos-phi and cos-2phi asymmetries in unpolarized semi-inclusive deep inelastic scattering, based on the recent multidimensional data released by the COMPASS and HERMES Collaborations. In the TMD framework, valid at relatively low transverse momenta, these asymmetries arise from intrinsic transverse momentum and transverse spin effects, and from their correlations. The role of the Cahn and Boer-Mulders effects in both azimuthal moments is explored up to order 1/Q. As the kinematics of the present experiments is dominated by the low-Q^2 region, higher-twist contributions turn out to be important, affecting the results of our fits.

arXiv comment18 pages, 5 figures, one paragraph added at the end of Section IV, one reference added. PRD version

References in corpus (24)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Time-reversal odd distribution functions in leptoproduction
• Semi-inclusive deep inelastic scattering at small transverse momentum
• QCD Factorization for Semi-Inclusive Deep-Inelastic Scattering at Low Transverse Momentum
• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• The role of Cahn and Sivers effects in Deep Inelastic Scattering
• Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron
• Transverse-Spin and Transverse-Momentum Effects in High-Energy Processes
• Investigations into the flavor dependence of partonic transverse momentum
• Unpolarised Transverse Momentum Dependent Distribution and Fragmentation Functions from SIDIS Multiplicities
• Intrinsic transverse parton momenta in deeply inelastic reactions
• The Boer-Mulders effect in unpolarized SIDIS: an analysis of the COMPASS and HERMES data on the $\cos 2\varphi$ asymmetry
• Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons
• Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons
• Hadron Transverse Momentum Distributions in Muon Deep Inelastic Scattering at 160 GeV/$c$
• A systematic phenomenological study of the $\cos 2\varphi$ asymmetry in unpolarized semi--inclusive DIS
• QCD resummation for semi-inclusive hadron production processes
• Measurement of Azimuthal Asymmetries in Deep Inelastic Scattering
• Transverse momentum dependence of the angular distribution of the Drell-Yan process
• Simultaneous extraction of transversity and Collins functions from new SIDIS and e+e- data
• Measurement of azimuthal asymmetries of the unpolarized cross section at HERMES
• A study on the interplay between perturbative QCD and CSS/TMD formalism in SIDIS processes
• Measurements of Unpolarized Azimuthal Asymmetries at COMPASS
• Azimuthal asymmetries in SIDIS off unpolarized targets at COMPASS

Cited by in corpus (14)

• Parton Fragmentation Functions
• Semi-Inclusive Deep Inelastic Scattering in Wandzura-Wilczek-type approximation
• Azimuthal asymmetries in unpolarized SIDIS and Drell-Yan processes: a case study towards TMD factorization at subleading twist
• Where do we stand with a 3-D picture of the proton?
• Probing Transverse Momentum Dependent Parton Distributions in Charmonium and Bottomonium Production
• Phenomenology of transverse spin: past, present and future
• First measurement of unpolarized SIDIS cross section and cross section ratios from a ${}^3$He target
• Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
• SIDIS-RC EvGen: a Monte-Carlo event generator of semi-inclusive deep inelastic scattering with the lowest-order QED radiative corrections
• New study of the Boer-Mulders function: Implications for the quark and hadron transverse momenta
• Measurement of the azimuthal modulations of hadrons in unpolarised SIDIS
• Mapping the internal structure of hadrons through color and spin effects
• Parton distributions and $\cos 2{\varphi }_h$ asymmetry induced by anomalous photon-quark coupling
• Soft background fields at next-to-leading power in transverse momentum dependent SIDIS with jets