Title

Deep exclusive π+ electroproduction off the proton at CLAS.

Document Type

Article

Publication Date

2013

Abstract

The exclusive electroproduction of π + above the resonance region was studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory by scattering a 6GeV continuous electron beam off a hydrogen target. The large acceptance and good resolution of CLAS, together with the high luminosity, allowed us to measure the cross section for the γ * p → nπ + process in 140 (Q 2, x B , t) bins: 0.16 < x B < 0.58, 1.6 GeV2 < Q 2 < 4.5 GeV2 and 0.1 GeV2 < −t < 5.3 GeV2. For most bins, the statistical accuracy is on the order of a few percent. Differential cross sections are compared to four theoretical models, based either on hadronic or on partonic degrees of freedom. The four models can describe the gross features of the data reasonably well, but differ strongly in their ingredients. In particular, the model based on Generalized Parton Distributions (GPDs) contain the interesting potential to experimentally access transversity GPDs.

Comments

© The Author(s) 2013 published by EDP Science with Springer.

This article is published with open access at Springerlink.com - Open Choice eligible journals publish open access articles under the liberal Creative Commons Attribution 4.0 International(CC BY) license.

Publication Title

The European Physical Journal A

Published Citation

Park, Kijun, M. Guidal, R. W. Gothe, J. M. Laget, M. Garçon, K. P. Adhikari, M. Aghasyan, Biselli A. et al [CLAS Collaboration]. "Deep exclusive π+ electroproduction off the proton at CLAS." The European Physical Journal A 49, no. 1 (2013): 16. https://doi.org/10.1140/epja/i2013-13016-9

DOI

10.1140/epja/i2013-13016-9

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