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Type: Journal article
Title: Accessing quark helicity through dihadron studies
Author: Matevosyan, H.
Kotzinian, A.
Thomas, A.
Citation: Physical Review Letters, 2018; 120(25):252001-1-252001-5
Publisher: American Physical Society
Issue Date: 2018
ISSN: 0031-9007
Statement of
Hrayr H. Matevosyan, Aram Kotzinian, and Anthony W. Thomas
Abstract: We present a new proposal to study the helicity-dependent dihadron fragmentation functions (DiFF), which describe the correlations of the longitudinal polarization of a fragmenting quark with the transverse momenta of the produced hadron pair. Recent experimental searches for this DiFF via azimuthal asymmetries in back-to-back hadron pair production in e⁺e⁻ annihilation by the BELLE Collaboration did not yield a signal. Here we propose a new way to access this DiFF in e⁺e⁻ annihilation, motivated by the recently recalculated cross section of this reaction, which explains why there was in fact no signal for the BELLE Collaboration to see. In this new approach the azimuthal asymmetry is weighted by the virtual photon’s transverse momentum square multiplying sine and cosine functions of difference of azimuthal angles of relative and total momentum for each pair. The integration over the virtual photon’s transverse momentum has the effect of separating the convolution between the helicity-dependent DiFFs in the quark and antiquark jets and results in a nonzero collinear expression containing Fourier moments of helicitydependent DiFFs. A second new measurement is also proposed for two-hadron production in semiinclusive deep inelastic scattering, where the asymmetry is weighted in a similar way for a single pair. This results in a collinear factorized form of the asymmetry, which includes the quark helicity parton distribution function and the same helicity-dependent DiFF, as in e⁺e⁻ production and will allow us to check the universality of this DiFF.
Description: Published 21 June 2018
Rights: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
DOI: 10.1103/PhysRevLett.120.252001
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