Measurement of the parity-violating longitudinal single-spin asymmetry for W± boson production in polarized proton-proton collisions at √s=500GeV

被引：0
作者：
Igo, G. [1 ]
机构：
[1] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
来源：
DIFFRACTION 2010: INTERNATIONAL WORKSHOP ON DIFFRACTION IN HIGH ENERGY PHYSICS | 2011年 / 1350卷
关键词：
W; RHIC; Spin; Polarized PP scattering; ELECTROMAGNETIC CALORIMETER; PHYSICS; DISTRIBUTIONS;
D O I：
10.1063/1.3601422
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We report the first measurement of the parity violating single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W- boson production in longitudinally polarized proton-proton collisions at root s = 500GeV by the STAR experiment at RHIC. The measured asymmetries, A(L)(W+) = -0.27 +/- 0.10 (stat.) +/- 0.02 (syst.) +/- 0.03 (norm.) and A(L)(W-) = 0.14 +/- 0.19 (stat.) +/- 0.02 (syst.) +/- 0.01 (norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized DIS measurements.
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