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Measurement of Exclusive π^0 Electroproduction Structure Functions
and their Relationship to Transversity GPDs
release_ugqhuufpu5bxjlzxnpbmnvefci
by
CLAS Collaboration: I. Bedlinskiy,
V. Kubarovsky,
S. Niccolai,
P.
Stoler,
K. P. Adhikari,
M. Aghasyan,
M. J. Amaryan,
M. Anghinolfi,
H.
Avakian,
H. Baghdasaryan,
J. Ball,
N.A. Baltzell
(+137 others)
Released
as a article
.
2012
Abstract
Exclusive π^0 electroproduction at a beam energy of 5.75 GeV has been
measured with the Jefferson Lab CLAS spectrometer. Differential cross sections
were measured at more than 1800 kinematic values in Q^2, x_B, t, and
ϕ_π, in the Q^2 range from 1.0 to 4.6 GeV^2, -t up to 2 GeV^2,
and x_B from 0.1 to 0.58. Structure functions σ_T +ϵσ_L,
σ_TT and σ_LT were extracted as functions of t for each of
17 combinations of Q^2 and x_B. The data were compared directly with two
handbag-based calculations including both longitudinal and transversity GPDs.
Inclusion of only longitudinal GPDs very strongly underestimates σ_T
+ϵσ_L and fails to account for σ_TT and σ_LT,
while inclusion of transversity GPDs brings the calculations into substantially
better agreement with the data. There is very strong sensitivity to the
relative contributions of nucleon helicity flip and helicity non-flip
processes. The results confirm that exclusive π^0 electroproduction offers
direct experimental access to the transversity GPDs.
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