Extraction of Beam-Spin Asymmetries from the Hard Exclusive π^{+} Channel off Protons in a Wide Range of Kinematics

Physical Review Letters
S DiehlCLAS Collaboration

Abstract

We have measured beam-spin asymmetries to extract the sinϕ moment A_{LU}^{sinϕ} from the hard exclusive e[over →]p→e^{'}nπ^{+} reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center of mass. The A_{LU}^{sinϕ} moment has been measured up to 6.6  GeV^{2} in -t, covering the kinematic regimes of generalized parton distributions (GPD) and baryon-to-meson transition distribution amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found A_{LU}^{sinϕ} to be negative, while a sign change was observed near 90° in the center of mass. The unique results presented in this Letter will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.

References

Feb 7, 2007·Physical Review Letters·C Muñoz CamachoUNKNOWN Jefferson Lab Hall A Collaboration
Jun 4, 2008·Physical Review Letters·F X GirodUNKNOWN CLAS Collaboration
Jan 7, 2017·Physical Review Letters·M DefurneUNKNOWN Jefferson Lab Hall A Collaboration
Jun 18, 2017·Physical Review Letters·M MazouzUNKNOWN Jefferson Lab Hall A Collaboration
Nov 26, 2019·Physical Review Letters·W B LiUNKNOWN Jefferson Lab <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>F</mi></mrow><mrow><mi

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