Abstract
Pion and kaon electroproduction data play a unique role in Nature and our understanding of them is essential for explaining hadron structure. Precision longitudinaltransverse separated pion and kaon cross sections are of particular interest. They allow for the extraction of meson form factors and validation of understanding of hard exclusive and semi-inclusive reactions (π+ , K + , π0 , γ ) towards 3D hadron imaging and potential future flavor decomposition. We review recent data and present prospects for deep exclusive pion and kaon electroproduction at the 12 GeV Jefferson Lab including the prospects to use projected charged- and neutral pion data to further determine the spin, charge-parity and flavor of GPDs, including the helicity-flip GPDs.
Highlights
The pion is the lightest quark system, with a single valence quark and a single valence antiquark
The pion and kaon are seen as the key to confirm the mechanism that dynamically generates most of the mass of hadrons and central to the effort to understand hadron structure [3]
E12-07-105 will provide L/T separated pion cross sections up to Q2 = 9 GeV2, which can be used to verify the applicability of the Generalized Parton Distributions (GPDs) formalism and to constrain theoretical models. This experiment will extend pion form factor data up to the highest possible momentum transfers achievable at a 12 GeV Jefferson Lab – Q2=8.5 GeV2. These data would allow for confirming recent calculations tied to dynamical chiral symmetry breaking, and could contribute a major step forward towards our understanding of Quantum Chromodynamics (QCD)
Summary
The pion is the lightest quark system, with a single valence quark and a single valence antiquark. A general belief is that the rules governing the strong interaction are left-right, i.e. chirally, symmetric If this were true, the pion would have no mass. Prominent examples of experimental observables that provide basic information about pion and kaon structure are the form factors [3,4,5,6,7,8,9,10,11,12,13]. The extraction of precision meson form factors from experiment requires a longitudinal-transverse (L/T) separation of the cross section isolating σL, proper selection of the pion pole process, extraction of the form factor using a model, and the validation of the technique. To validate the meson factorization theorems and potentially extract flavor separated GPDs from experiment, one has to measure the longitudinal-transverse (L/T) separated cross sections and their t and Q2 dependencies. Two experiments are planned with the 12 GeV JLab extending charged pion data to Q2 of about 9 GeV2 [32] and kaon data to 5.5 GeV2 [33]
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