Charged pion form factor between Q{sup 2}=0.60 and 2.45 GeV{sup 2}. II. Determination of, and results for, the pion form factor

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.045203· OSTI ID:21192341

Huber, G M; Brash, E J; Kovaltchouk, V; Lolos, G J; Vidakovic, S; Xu, C ^[1]; Blok, H P; Tvaskis, V ^[2]; Horn, T ^[3]; Beise, E J; Breuer, H; Chang, C C; Chant, N; Gustafsson, K; King, P M; Liu, J; Roos, P G ^[3]; Gaskell, D; Mack, D J ^[4]

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1. University of Regina, Regina, Saskatchewan S4S 0A2 (Canada)
2. VU university, NL-1081 HV Amsterdam (Netherlands)
3. University of Maryland, College Park, Maryland 20742 (United States)
4. Physics Division, TJNAF, Newport News, Virginia 23606 (United States)

The charged pion form factor, F{sub {pi}}(Q{sup 2}), is an important quantity that can be used to advance our knowledge of hadronic structure. However, the extraction of F{sub {pi}} from data requires a model of the {sup 1}H(e,e{sup '}{pi}{sup +})n reaction and thus is inherently model dependent. Therefore, a detailed description of the extraction of the charged pion form factor from electroproduction data obtained recently at Jefferson Lab is presented, with particular focus given to the dominant uncertainties in this procedure. Results for F{sub {pi}} are presented for Q{sup 2}=0.60-2.45 GeV{sup 2}. Above Q{sup 2}=1.5 GeV{sup 2}, the F{sub {pi}} values are systematically below the monopole parametrization that describes the low Q{sup 2} data used to determine the pion charge radius. The pion form factor can be calculated in a wide variety of theoretical approaches, and the experimental results are compared to a number of calculations. This comparison is helpful in understanding the role of soft versus hard contributions to hadronic structure in the intermediate Q{sup 2} regime.

• OSTI ID: 21192341
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 4; Other Information: DOI: 10.1103/PhysRevC.78.045203; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CEBAF ACCELERATOR
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
ELECTRON BEAMS
ELECTROPRODUCTION
EXTRACTION
FORM FACTORS
HYDROGEN 1 TARGET
MONOPOLES
NEUTRONS
PIONS
SIMULATION