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Measurement of the cross section and longitudinal double-spin asymmetry for di-jet production in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV

The collaboration
No Journal Information, 2016

Abstract (data abstract)
BNL-RHIC. We report the first measurement of the longitudinal double-spin asymmetry $A_{LL}$ for mid-rapidity di-jet production in polarized $pp$ collisions at a center-of-mass energy of $\sqrt{s} = 200$ GeV. The di-jet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. $A_{LL}$ results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-$x > 0.05$.

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Data from Figure 1A

10.17182/hepdata.77208.v1/t1

Data simulation comparison (with arbitrary normalization). Di-jet invariant mass.

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Data from Figure 1B

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Data simulation comparison (with arbitrary normalization). Difference between jet pseudorapidities.

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Data from Figure 1C

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Data simulation comparison (with arbitrary normalization). Difference between jet azimuthal angles.

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Data from Figure 2

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The particle-level di-jet differential cross section. The systematic uncertainty on the data contains contributions from track finding efficiency, track transverse...

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Data from Figure 3 (Top Panel)

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Values of gluon X1 and X2 obtained from the PYTHIA detector-level simulation for the same-sign di-jet topology compared to the...

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Data from Figure 3 (Bottom Panel)

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Values of gluon X1 and X2 obtained from the PYTHIA detector-level simulation for the opposite-sign di-jet topology compared to the...

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Data from Figure 4 (Top Panel)

10.17182/hepdata.77208.v1/t7

Di-jet A_LL asymmetry vs parton-level invariant mass for the same-sign di-jet topology. The systematic uncertainty on the mass includes contributions...

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Data from Figure 4 (Top Panel)

10.17182/hepdata.77208.v1/t8

Theoretical predictions for the di-jet A_LL asymmetry for the same-sign topology using the DSSV14 and NNPDFpol1.1 polarized PDF sets. The...

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Data from Figure 4 (Bottom Panel)

10.17182/hepdata.77208.v1/t9

Di-jet A_LL asymmetry vs parton-level invariant mass for the opposite-sign di-jet topology. The systematic uncertainty on the mass includes contributions...

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Data from Figure 4 (Bottom Panel)

10.17182/hepdata.77208.v1/t10

Theoretical predictions for the di-jet A_LL asymmetry for the opposite-sign topology using the DSSV14 and NNPDFpol1.1 polarized PDF sets. The...