Beam Spin Asymmetries of Charged and Neutral Pion Productions in Semi-inclusive DIS

Abstract

We present a study on the beam single spin asymmetries $A_{LU}^{\sin {\varphi }_h}$ of ${\pi }^{+}$, ${\pi }^{-}$ and ${\pi }^0$ production in semi-inclusive deep inelastic scattering process, by considering Collins effect and the $g^{\perp }{D}_1$ term simultaneously. We calculate the twist-3 distributions $e(x,{\mathbf{k}}_T^2)$ and $g^{\perp }(x,{\mathbf{k}}_T^2)$ for the valence quarks inside the proton in a spectator model. We consider two different options for the form of diquark propagator, as well as two different choices for the model parameters in the calculation. Using the model results, we estimate the beam spin asymmetries $A_{LU}^{\sin {\varphi }_h}$ for the charged and neutral pions and compare the results with the measurement from the HERMES Collaboration. We also make predictions on the asymmetries at CLAS with a $5.5\text{GeV}$ beam using the same model results. It is found that different choices for the diquark propagator will not only lead to different expressions for the distribution functions, but also result in different sizes of the asymmetries. Our study also shows that, although the spectator model calculation can describe the asymmetries for certain pion production in some kinematic regions, it seems difficult to explain the asymmetries of pion production for all three pions in a consistent way from the current versions.

9 pages, 8 figures

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Cited by in corpus (14)

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• Where do we stand with a 3-D picture of the proton?
• Beam-spin asymmetries from semi-inclusive pion electroproduction
• Transverse structure of the pion beyond leading twist with basis light-front quantization
• Transverse single-spin asymmetries of pion production in semi-inclusive DIS at subleading twist
• Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets
• Double Spin Asymmetries $A_{LT}^{\cos {\varphi }_S}$ and $A_{LT}^{\cos (2{\varphi }_h-{\varphi }_S)}$ in semi-inclusive DIS
• Transverse structure of the proton beyond leading twist: A light-front Hamiltonian approach
• Single-spin asymmetries in electroproduction of pions on the longitudinally polarized nucleon targets
• Semi-inclusive deeply inelastic neutrino and antineutrino nucleus scattering
• On the beam spin asymmetries of electroproduction of charged hadrons off the nucleon targets
• Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model