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 · Tue Feb 27 00:00:00 EST 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 $$\pi^+\pi^-$$ 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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Contributing Organization:: Jefferson Lab Angular Momentum (JAM) Collaboration

Grant/Contract Number:: AC05-06OR23177; PHY-2011763; PHY-2308567; PHY-2012002; PHY-2310031; PHY-2335114

OSTI ID:: 2315067

Alternate ID(s):: OSTI ID: 2318473

Report Number(s):: JLAB-THY-23-3901; DOE/OR/23177-7035; PRVDAQ; 034024

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

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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