Measurement of the generalized form factors near pion threshold via gamma*p --> npi^+ in CLAS

Conference · Sun May 01 00:00:00 EDT 2011

DOI:https://doi.org/10.1142/9789814329569_0018· OSTI ID:1023166

Park, Kijun

We extracted the multipoles near pion threshold for the first time at high momentum transfers (Q2) in the nπ+ final state channel. The dominance of the S-wave transverse multipole (E0+) is expected in this region, which allows us to access the new generalized form factors G1, G2 within the Light-Cone-Sum-Rule (LCSR) framework. In this analysis, we used one of the recent CLAS experimental data sets which utilized the high-energy polarized electron beam on unpolarized proton target using the 4π detector coverage. We measured the differential cross sections and extracted the multipoles using two methods, LCSR and multipole fit. Both methods show consistent results, which are almost Q2 independent.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1023166
• Report Number(s): JLAB-PHY-10-1213; DOE/OR/23177-1765; TRN: US1104367
• Resource Relation: Conference: 4th Workshop On Exclusive Reactions At High Momentum Transfer, 18-21 May 2010, Newport News, Virginia
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
DIFFERENTIAL CROSS SECTIONS
ELECTRON BEAMS
FORM FACTORS
MOMENTUM TRANSFER
MULTIPOLES
PIONS
PROTONS
S WAVES
TARGETS