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Measurement of unpolarized semi-inclusive pi+ electroproduction off the proton

Journal Article · · Physical Review D
OSTI ID:956069
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Semi-inclusive pi+ electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range in Q2, x, z, and pT and over the complete range of azimuthal angles, phi, enabling us to separate the different structure functions, H2+eps*H1, H3 and H4. Our measurements of H2 at low-x were found to be in fairly good agreement with pQCD calculations, suggesting a precocious factorization of the process. Indeed, the conventional f(x)*D(z) term can account for almost all of the observed cross section, even at small z. The measured xF-distributions are in qualitative agreement with high energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the anti-quark fragmentation measured in e+e- collisions. We have observed that the p
Research Organization:
Thomas Jefferson Lab National Accelerator Facility
Sponsoring Organization:
USDOE
OSTI ID:
956069
Report Number(s):
JLAB-PHY-08-872; arXiv:0809.1153; DOE/OR/23177-0497
Journal Information:
Physical Review D, Journal Name: Physical Review D; ISSN PRVDAQ; ISSN 1550-7998
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON BEAMS
ELECTROPRODUCTION
FACTORIZATION
FRAGMENTATION
PIONS
PROTONS
STRUCTURE FUNCTIONS
TARGETS