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Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at s=200 GeV
- Abdallah, MS;
- Adam, J;
- Adamczyk, L;
- Adams, JR;
- Adkins, JK;
- Agakishiev, G;
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- Brandenburg, JD;
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- Butterworth, J;
- Cai, XZ;
- Caines, H;
- de la Barca Sánchez, M Calderón;
- Cebra, D;
- Chakaberia, I;
- Chaloupka, P;
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- Vasiliev, AN;
- Vassiliev, I;
- Verkest, V;
- Videbæk, F;
- Vokal, S;
- Voloshin, SA;
- Wang, F;
- Wang, G;
- Wang, JS;
- Wang, P;
- Wang, Y;
- Wang, Y;
- Wang, Z;
- Webb, JC;
- Weidenkaff, PC;
- Wen, L;
- Westfall, GD;
- Wieman, H;
- Wissink, SW;
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- Zurek, M;
- Zyzak, M
- et al.
Published Web Location
https://doi.org/10.1103/physrevd.103.l091103Abstract
We report high-precision measurements of the longitudinal double-spin asymmetry, ALL, for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s=200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Δg(x,Q2), for gluon momentum fractions in the range from x≃0.05 to x≃0.5, while the new dijet data provide further constraints on the x dependence of Δg(x,Q2). The results are in good agreement with previous measurements at s=200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δg(x,Q2) is positive for x>0.05.
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