Twist-4 contributions to semi-inclusive $e^{+}{e}^{-}$-annihilation process

Abstract

We present the complete twist-4 results for the semi-inclusive annihilation process $e^{+}+e^{-}\to h+\bar{q}+X$ at the tree level of perturbative quantum chromodynamics. The calculations are carried out by using the formalism obtained by applying the collinear expansion to this process where the multiple gluon scattering is taken into account and gauge links are obtained systematically and automatically. We present the results for structure functions in terms of gauge invariant fragmentation functions up to twist-4 and the corresponding results for the azimuthal asymmetries and polarizations of hadrons produced. The results obtained show in particular that similar to that for semi-inclusive deeply inelastic scattering, for structure functions associated with sine or cosine of odd number of azimuthal angle(s), there are only twist-3 contributions, while for those of even number of azimuthal angle(s), there are leading twist and twist-4 contributions. For all those structure functions that have leading twist contributions, there are twist-4 addenda to them. Hence twist-4 contributions may even have large influences on extracting leading twist fragmentation functions from the data. We also suggest a method for a rough estimation of twist-4 contributions based on the leading twist fragmentation functions.

16 pages, 4 figures

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Cited by in corpus (9)

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• Parity violating semi-inclusive deeply inelastic scattering at the Electron-Ion Collider
• Twist-3 Contributions in Semi-Inclusive DIS in the Target Fragmentation Region
• Azimuthal asymmetries from $\theta$ Vacuum
• Parity odd Fragmentation Functions
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• The forward-backward asymmetry in the electron positron annihilation process at twist-4
• Transverse momentum asymmetry in the semi-inclusive electron positron annihilation process
• Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model