First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions

Cocuzza, C.; Metz, A.; Pitonyak, D.; Prokudin, A.; Sato, N.; Seidl, R.

doi:10.1103/PhysRevD.109.034024

Title: First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions

Journal Article · 26 February 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.034024 · OSTI ID:2315067

; Metz, A.; Pitonyak, D.; Prokudin, A.; Sato, N.; Seidl, R.

We perform a comprehensive study within quantum chromodynamics (QCD) of dihadron observables in electron-positron annihilation, semi-inclusive deep-inelastic scattering, and proton-proton collisions, including recent cross section data from Belle and azimuthal asymmetries from STAR. We extract simultaneously for the first time $π^{+} π^{-}$ dihadron fragmentation functions (DiFFs) and the nucleon transversity distributions for up and down quarks as well as antiquarks. For the transversity distributions we impose their small- $x$ asymptotic behavior and the Soffer bound. In addition, we utilize a new definition of DiFFs that has a number density interpretation to then calculate expectation values for the dihadron invariant mass and momentum fraction. Furthermore, we investigate the compatibility of our transversity results with those from single-hadron fragmentation (from a transverse momentum dependent/collinear twist-3 framework) and the nucleon tensor charges computed in lattice QCD. We find a universal nature to all of this available information. Future measurements of dihadron production can significantly further this research, especially, as we show, those that are sensitive to the region of large parton momentum fractions. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 2315067

Alternate ID(s):: OSTI ID: 2318473

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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