Transverse Momentum Dependence

See below for recent highlights of TMDs in JAM.  Click images for enlargement.

UPDATED QCD GLOBAL ANALYSIS OF SINGLE TRANSVERSE-SPIN ASYMMETRIES
A new analysis is performed, updating the QCD global analysis of single transverse-spin asymmetries presented in Cammarota, et al., PRD 102, 054002 (2020) (JAM3D-20). JAM3D-20 simultaneously included transverse momentum dependent and collinear twist-3 observables, both of which are sensitive to quark-gluon-quark correlations in hadrons. In this study, the twist-3 chiral odd fragmentation function   is extracted by incorporating the sinϕs modulation data from SIDIS along with its contribution to the single transverse-spin asymmetry in pion production from proton-proton collisions. Impacts of lattice QCD tensor charge calculations and the Soffer bound are explored in this global analysis. Both constraints can be accommodated within the new results, with  playing a key role in maintaining agreement with the data from proton-proton collisions.

KINEMATIC REGIME ESTIMATION IN SEMI-INCLUSIVE DIS
A new phenomenological tool has been developed to guide the analysis and interpretation of semi-inclusive deep-inelastic scattering measurements (SIDIS). The new tool, referred to as “affinity”, helps physicists visualize and quantify the proximity of any experimental kinematic bin to a particular hadron production region, such as that associated with transverse momentum dependent factorization. As a first application, the affinity estimator has been used to analyze existing HERMES and COMPASS data, as well as expected SIDIS data from Jefferson Lab and the future Electron-Ion Collider.

UPDATED QCD GLOBAL ANALYSIS OF SINGLE TRANSVERSE-SPIN ASYMMETRIES
A new analysis is performed, updating the QCD global analysis of single transverse-spin asymmetries presented in Cammarota, et al., PRD 102, 054002 (2020) (JAM3D-20). JAM3D-20 simultaneously included transverse momentum dependent and collinear twist-3 observables, both of which are sensitive to quark-gluon-quark correlations in hadrons. In this study, the twist-3 chiral odd fragmentation function   is extracted by incorporating the sinϕs modulation data from SIDIS along with its contribution to the single transverse-spin asymmetry in pion production from proton-proton collisions. Impacts of lattice QCD tensor charge calculations and the Soffer bound are explored in this global analysis. Both constraints can be accommodated within the new results, with  playing a key role in maintaining agreement with the data from proton-proton collisions.

KINEMATIC REGIME ESTIMATION IN SEMI-INCLUSIVE DIS
A new phenomenological tool has been developed to guide the analysis and interpretation of semi-inclusive deep-inelastic scattering measurements (SIDIS). The new tool, referred to as “affinity”, helps physicists visualize and quantify the proximity of any experimental kinematic bin to a particular hadron production region, such as that associated with transverse momentum dependent factorization. As a first application, the affinity estimator has been used to analyze existing HERMES and COMPASS data, as well as expected SIDIS data from Jefferson Lab and the future Electron-Ion Collider.