Abstract
By integrating across the light-cone energy, totally unintegrated, off-diagonal quark–quark generalized parton correlation functions can yield generalized transverse-momentum dependent parton distributions (GTMDs). We have obtained the twist-4 GTMDs for the case of proton in the light-front quark–diquark model. We have decoded the quark–quark GTMD correlator for proton and solved the parametrization equations for Dirac matrix structure at twist-4. We have derived the explicit equations of GTMDs for the diquark being scalar or vector leading to the results for the struck quark being a u or d quark. Being a multidimensional function, the dependence is studied with two variables at a time, keeping the others fixed. Transverse-momentum dependent form factors have been obtained from GTMDs via integration over the longitudinal momentum fraction x of the quark. We have debated over the possibility to specify the initial and final state polarizations of the smacked quark and the nucleon in twist-4 GTMDs as well as the Wigner distributions. Additionally, from twist-4 GTMDs, we have deduced the twist-4 T-even TMDs and found its synchronization with the already published results.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Since this is a theoretical work, there is no data to be deposited. All the results and calculations have been included in the ms.]
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Acknowledgements
H.D. would like to thank the Science and Engineering Research Board, Department of Science and Technology, Government of India through the grant (Ref No.TAR/2021/000157) under TARE scheme for financial support.
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Sharma, S., Dahiya, H. Twist-4 proton GTMDs in the light-front quark–diquark model. Eur. Phys. J. A 59, 235 (2023). https://doi.org/10.1140/epja/s10050-023-01156-8
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DOI: https://doi.org/10.1140/epja/s10050-023-01156-8