Moments of the longitudinal proton structure function FL from global data in the Q(2) range 0.75-45.0 (GeV/c)(2).
Phys Rev Lett
; 110(15): 152002, 2013 Apr 12.
Article
in En
| MEDLINE
| ID: mdl-25167253
ABSTRACT
We present an extraction of the lowest three moments of the proton longitudinal structure function FL from world data between Q(2)=0.75 and 45 (GeV/c)(2). The availability of new FL data at low Bjorken x from HERA and at large x from Jefferson Lab allows the first determination of these moments over a large Q(2) range, relatively free from uncertainties associated with extrapolations into unmeasured regions. The moments are found to be underestimated by leading twist structure function parametrizations, especially for the higher moments, suggesting either the presence of significant higher twist effects in FL and/or a larger gluon distribution at high x.
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Database:
MEDLINE
Type of study:
Risk_factors_studies
Language:
En
Journal:
Phys Rev Lett
Year:
2013
Type:
Article
Affiliation country:
United States