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Flavor Dependence of Charged Pion Fragmentation Functions

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arxiv 2408.16640 v2 pith:5BQ3QASD submitted 2024-08-29 nucl-ex hep-phnucl-th

H. Bhatt , P. Bosted , S. Jia , W. Armstrong , D. Dutta , R. Ent , D. Gaskell , E. Kinney
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H. Mkrtchyan S. Ali R. Ambrose D. Androic C. Ayerbe Gayoso A. Bandari V. Berdnikov D. Bhetuwal D. Biswas M. Boer E. Brash A. Camsonne J. P. Chen J. Chen M. Chen E. M. Christy S. Covrig S. Danagoulian M. Diefenthaler B. Duran M. Elaasar C. Elliot H. Fenker E. Fuchey J. O. Hansen F. Hauenstein T. Horn G. M. Huber M. K. Jones M. L. Kabir A. Karki B. Karki S. J. D. Kay C. Keppel V. Kumar N. Lashley-Colthirst W. B. Li D. Mack S. Malace P. Markowitz M. McCaughan E. McClellan D. Meekins R. Michaels A. Mkrtchyan G. Niculescu I. Niculescu B. Pandey S. Park E. Pooser M. Rehfuss B. Sawatzky G. R. Smith H. Szumila-Vance A. S. Tadepalli V. Tadevosyan R. Trotta H. Voskanyan S. A. Wood Z. Ye C. Yero X. Zheng
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classification nucl-exhep-phnucl-th
keywords fragmentationfunctionsrangedependenceelectronexperimentflavormomentum
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abstract

We have measured the flavor dependence of multiplicities for pi^+ and pi^- production in semi-inclusive deep-inelastic scattering (SIDIS) on proton and deuteron targets to explore a possible charge symmetry violation in fragmentation functions. The experiment used an electron beam with energies of 10.2 and 10.6 GeV at Jefferson Lab and the Hall-C spectrometers. The electron kinematics spanned the range 0.3<x<0.6, 2<Q^2<5.5 GeV^2, and 4<W^2<11 GeV^2. The pion fractional momentum range was 0.3< z <0.7, and the transverse momentum range was 0<p_T<0.25 GeV/c. Assuming factorization at low p_T and allowing for isospin breaking, we find that the results can be described by two "favored" and two "un-favored" effective low $p_T$ fragmentation functions that are flavor-dependent. However, they converge to a common flavor-independent value at the lowest x or highest W of this experiment.

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  1. Flavor, transverse momentum, and azimuthal dependence of charged pion multiplicities in SIDIS with 10.6 GeV electrons

    hep-ex 2025-10 conditional novelty 6.0 of 10

    New JLab Hall C data show charged-pion SIDIS transverse-momentum shapes are nearly flavor-independent and π− azimuthal cos(φ*) moments are positive at high z.

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