A new measurement of the spin dependent structure function g1p

被引：0
|
作者：
Deshpande, A [1 ]
机构：
[1] Yale Univ, New Haven, CT 06511 USA
来源：
HADRON SPECTROSCOPY | 1998年 / 432期
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中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We present a new measurement of the virtual photon proton asymmetry A(1)(p) in the kinematic range 0.0008 < x < 0.7 and 0.2 < Q(2) < 100 GeV2. The spin-dependent structure function g(1)(p) is determined for the data with Q(2) > 1 GeV2. A perturbative QCD evolution in next-to-leading order is used to determine g(1)(p)(2) at a constant Q(2). At Q(2) = 10 GeV2 we find, in the measured range, integral(0.003)(0.7) g(1)(p)(x)dx = 0.139 +/- 0.006 (stal) +/- 0.008 (syst) +/- 0.006 (evol). The value of the first moment Gamma(1)(p) = integral(0)(1) g(1)(p)(x)dx of g(1)(p) depends on the approach used to describe the behavior of g(1)(p) at low a. We find that the Ellis-Jaffe sum rule is violated while the data, confirm the Bjorken sum rule.
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页码：157 / 160
页数：4
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