Separated kaon electroproduction cross section and the kaon form factor from 6 GeV JLab data

JLAB FPI-2 and E93-018 Collaboration

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The H1(e,e′K+)Λ reaction was studied as a function of the Mandelstam variable -t using data from the E01-004 (FPI-2) and E93-018 experiments that were carried out in Hall C at the 6 GeV Jefferson Laboratory. The cross section was fully separated into longitudinal and transverse components, and two interference terms at four-momentum transfers Q2 of 1.00, 1.36, and 2.07GeV2. The kaon form factor was extracted from the longitudinal cross section using the Regge model by Vanderhaeghen et al. [Phys. Rev. C 57, 1454 (1998)PRVCAN0556-281310.1103/PhysRevC.57.1454]. The results establish the method, previously used successfully for pion analyses, for extracting the kaon form factor. Data from 12 GeV Jefferson Laboratory experiments are expected to have sufficient precision to distinguish between theoretical predictions, for example, recent perturbative QCD calculations with modern parton distribution amplitudes. The leading-twist behavior for light mesons is predicted to set in for values of Q2 between 5 and 10GeV2, which makes data in the few-GeV regime particularly interesting. The Q2 dependence at fixed x and -t of the longitudinal cross section that we extracted seems consistent with the QCD factorization prediction within the experimental uncertainty.

Original languageEnglish
Article number025204
JournalPhysical Review C
Issue number2
Publication statusPublished - 28 Feb 2018


This work was supported in part by NSF Grants No. PHY1714133, No. PHY1306227, and No. PHY1306418. This material is based upon work supported by the US Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177. We acknowledge additional research grants from US Department of Energy, ANL DOE Grant No. DE-AC02-06CH11357, the Natural Sciences and Engineering Research Council of Canada (NSERC), NATO, and FOM (Netherlands).

FundersFunder number
ANL DOEDE-AC02-06CH11357
Office of Nuclear Physics
US Department of Energy
National Science FoundationPHY1306227
North Atlantic Treaty Organization
Office of Science
Natural Sciences and Engineering Research Council of Canada
Foundation for Fundamental Research on Matter


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