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Insights into the higher-twist distribution $e(x)$ at CLAS
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abstract
This preprint has been superseded by (A. Courtoy, A. S. Miramontes, H. Avakian, M. Mirazita, and S. Pisano, Phys. Rev. D 106, 014027 (2022), 2203.14975). The latter should be consulted and referred to for the extraction of the $e(x)$ PDF. We present the extraction of the twist-3 PDF, $e(x)$, through the analysis of the preliminary data for the $\sin\phi$-moment of the beam-spin asymmetry for di-hadron Semi-Inclusive DIS at CLAS at 6 GeV. Pion-pair production off unpolarized target in the DIS regime provide an access to the higher-twist Parton Distribution Functions $e(x)$ and to Di-hadron Fragmentation Functions. The latter have been extracted from the semi-inclusive production of two hadron pairs in back-to-back jets in $e^+e^-$ annihilation at Belle. The $e(x)$ PDF offers important insights into the physics of the largely-unexplored quark-gluon correlations, and its $x$-integral is related to the marginally-known scalar-charge of the nucleon, and to the pion-nucleon $\sigma$-term, a fundamental property of the nucleon.
Forward citations
Cited by 2 Pith papers
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Beam single spin asymmetry $A_{LU}^{\sin \phi_R}$ of the dihadron production in SIDIS process
Spectator-model estimates of the dihadron beam spin asymmetry reproduce the z and Mh dependence of CLAS data, miss the x and Q2 dependence, and predict measurable asymmetries at future facilities.
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Extraordinary nature of the nucleon scalar charge and its densities as a signal of nontrivial vacuum structure of QCD
The nucleon scalar density approaches the vacuum quark condensate at infinity, which the author argues produces a delta-function singularity at x=0 in the chiral-odd twist-3 PDF e(x).
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