Hard Pion Electroproduction at Medium Energies
Even at moderate energy machines, there is a regime where hard pion electroproduction proceeds by a perturbatively calculable process. The process, they claim, is not the leading twist fragmentation one but rather a higher twist process that produces kinematically isolated pions. Semiexclusive data may teach us more about parton distribution functions of the target and the pion distribution amplitude. In addition, there is a connection to generalized parton distribution calculations of exclusive processes in that the perturbative kernel is the same. The subject of this report is semiexclusive photoproduction of hard pions, and the semiexclusive deep inelastic scattering version of the same, e + p {yields} e + {pi} + X, which we can also write as p(e,e{prime}{prime})X. The authors are interested in pions with large transverse momentum (that is what ''hard'' means), and particularly in pions that are kinematically isolated, rather than pions that are part of a jet. And further, they shall hope to isolate processes that can be calculated perturbatively using Quantum Chromodynamics (QCD).
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 809892
- Report Number(s):
- JLAB-THY-02-62; DOE/ER/40150-2412
- Country of Publication:
- United States
- Language:
- English
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