|Title: ||Direct estimate of the gluon polarization in the nucleon.|
|Authors: ||Ellis, John R|
|Issue Date: ||Jan-2005|
|Publisher: ||HEP, Cavendish Laboratory, University of Cambridge|
|Series/Report no.: ||Cavendish-HEP-05-02|
|Abstract: ||We make a first crude direct estimate of the net gluon polarization in the proton,
G, combining data on the asymmetries in high-pT hadron production
from the HERMES, SMC and COMPASS collaborations. Although these
data sample a restricted range of x, they provide no hint that G is large.
Fixing the normalizations of different theoretical parametrizations using the
hadron asymmetry data, we find typical central values of G ∼ 0.5, with
uncertainties of similar magnitude. Values of G ≥ 2 are disfavoured by
2 ∼ 9 to 20, depending on the parametrization used.|
|Appears in Collections:||Scholarly works - High Energy Physics|
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