# Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors

Abstract : We report the measurement of near threshold neutral pion electroproduction cross sections and the extraction of the associated structure functions on the proton in the kinematic range $Q^2$ from 2 to 4.5 GeV$^2$ and $W$ from 1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles $E_{0+}$ and $S_{0+}$ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to the generalized form factors $G_1^{\pi^0 p}(Q^2)$ and $G_2^{\pi^0 p}(Q^2)$. The data are compared to these generalized form factors and the results for $G_1^{\pi^0 p}(Q^2)$ are found to be in good agreement with the LCSR predictions, but the level of agreement with $G_2^{\pi^0 p}(Q^2)$ is poor.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00762236
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Submitted on : Thursday, December 6, 2012 - 4:41:30 PM
Last modification on : Tuesday, January 5, 2021 - 1:38:04 PM

### Citation

P. Khetarpal, P. Stoler, I. G. Aznauryan, V. Kubarovsky, K. P. Adhikari, et al.. Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors. Physical Review C, American Physical Society, 2013, 87, pp.045205. ⟨10.1103/PhysRevC.87.045205⟩. ⟨in2p3-00762236⟩

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