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Heppelmann, S. 2
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Adams, J.R. 1

Longitudinal double-spin asymmetry for inclusive jet and dijet production in $pp$ collisions at $\sqrt{s} = 510$ GeV

The STAR collaboration Adam, J. ; Adamczyk, L. ; Adams, J.R. ; et al.

Phys.Rev.D 100 (2019) 052005, 2019.

https://inspirehep.net/literature/1738738 Inspire Record 1738738 DOI 10.17182/hepdata.105278 https://doi.org/10.17182/hepdata.105278

We report the first measurement of the inclusive jet and the dijet longitudinal double-spin asymmetries, $A_{LL}$, at midrapidity in polarized $pp$ collisions at a center-of-mass energy $\sqrt{s} = 510$ GeV. The inclusive jet $A_{LL}$ measurement is sensitive to the gluon helicity distribution down to a gluon momentum fraction of $x\approx 0.015$, while the dijet measurements, separated into four jet-pair topologies, provide constraints on the $x$ dependence of the gluon polarization. Both results are consistent with previous measurements made at $\sqrt{s}= 200$ GeV in the overlapping kinematic region, $x > 0.05$, and show good agreement with predictions from recent next-to-leading order global analyses.

56 data tables

Figure 1 (200GeV)

Fractions of the next-to-leading-order cross section for inclusive jet production arising from quark-quark, quark-gluon and gluon-gluon scattering in pp collisions (200GeV)

Figure 1 (500GeV)

Fractions of the next-to-leading-order cross section for inclusive jet production arising from quark-quark, quark-gluon and gluon-gluon scattering in pp collisions (500GeV)

Figure 2 (JP0)

The upper panel shows the jet yield vs detector jet pT in data and simulation for each of the three trigger categories. The lower three panels show the relative differences between data and simulation (JP0)

Figure 2 (JP1)

Figure 2 (JP2)

Figure 3 (data, 8.0 GeV/c)

Distributions of the charged hadrons within the jets as a function of the hadron longitudinal momentum fraction,z, for two typical detector jet pT bins

Figure 3

Distributions of the charged hadrons within the jets as a function of the hadron longitudinal momentum fraction,z, for two typical detector jet pT bins

Figure 4 (data, 8GeV/c)

Distributions of the charged hadrons within the jets as a function of the hadron longitudinal momentum transverse to the thrust axis,jT, for two typical detector jet pT bins (data, 8GeV/c)

Figure 4 (simulation, 8GeV/c)

Distributions of the charged hadrons within the jets as a function of the hadron longitudinal momentum transverse to the thrust axis,jT, for two typical detector jet pT bins (simulation, 8GeV/c)

Figure 4 (data, 34.4GeV/c)

Distributions of the charged hadrons within the jets as a function of the hadron longitudinal momentum transverse to the thrust axis,jT, for two typical detector jet pT bins (data, 34.4GeV/c)

Figure 4 (simulation, 34.4GeV/c)

Distributions of the charged hadrons within the jets as a function of the hadron longitudinal momentum transverse to the thrust axis,jT, for two typical detector jet pT bins (simulation, 34.4GeV/c)

Figure 5 (JP0, 34.4GeV/c)

The upper panel shows the electromagnetic fraction distribution for jets in a low-pT bin. The lower panel shows the electromagnetic fraction distributions in a higher pT bin for each of the three jet categories (JP0, 34.4GeV/c)

Figure 5

Figure 6 (JP0)

Dijet yield vs invariant mass as measured at the detector level. (JP0)

Figure 6 (JP1)

Dijet yield vs invariant mass as measured at the detector level. (JP1)

Figure 6 (JP2)

Dijet yield vs invariant mass as measured at the detector level. (JP2)

Figure 7 (a)

Dijet opening angle Delta phi distribution

Figure 7 (b)

Dijet opening angle Delta eta distribution

Figure 8 (data and simulation distribution)

Distributions of the charged hadrons within the offaxis cones as a function of hadron pT

Figure 8 (the ratio of simulation and data)

The ratio of simulation to data for pT < 2 GeV/c

Figure 9 (a)

the mean underlying event correction to the jet transverse momentum, as a function of detector jet pT

Figure 9 (b, data)

the mean underlying event correction to the dijet mass, as a function of detector dijet invariant mass, from data

Figure 9 (b, simulation)

the mean underlying event correction to the dijet mass, as a function of detector dijet invariant mass, from simulation

Figure 10

the observed longitudinal double-spin asymmetry of the underlying event contributions, as a function of detector jet pT

Figure 11 (triggered detector jets, 8.0 GeV/c)

the sampled gluon x distributions, weighted by the partonic asymmetry (triggered detector jets, 8.0 GeV/c)

Figure 11 (triggered detector jets, 34.4 GeV/c)

the sampled gluon x distributions, weighted by the partonic asymmetry (triggered detector jets, 34.4 GeV/c)

Figure 11 (all parton jets, 8.0 GeV/c)

the sampled gluon x distributions, weighted by the partonic asymmetry (all parton jets, 8.0 GeV/c)

Figure 11 (all parton jets, 34.4 GeV/c)

the sampled gluon x distributions, weighted by the partonic asymmetry (all parton jets, 34.4 GeV/c)

Figure 12 (Run12)

the inclusive jet asymmetries and systematic uncertainties,as function of pT compared to the theoretical predictions (Run12)

Figure 12 (DSSV14)

the inclusive jet asymmetries and systematic uncertainties,as function of pT compared to the theoretical predictions (DSSV14)

Figure 12 (NNPDFpol.1)

the inclusive jet asymmetries and systematic uncertainties,as function of pT compared to the theoretical predictions (NNPDFpol.1)

Figure 12 (NNPDFpol.1 -rep)

the inclusive jet asymmetries and systematic uncertainties,as function of pT compared to the theoretical predictions (NNPDFpol.1 -rep)

Figure 13 (Run12)

the inclusive jet asymmetries and systematic uncertainties, as function of xT compared to the theoretical predictions (Run12)

Figure 13 (Run9)

the inclusive jet asymmetries and systematic uncertainties, as function of xT compared to the theoretical predictions (Run9)

Figure 13 (DSSV14)

the inclusive jet asymmetries and systematic uncertainties, as function of xT compared to the theoretical predictions (DSSV14)

Figure 13 (NNPDFpol1.1)

the inclusive jet asymmetries and systematic uncertainties, as function of xT compared to the theoretical predictions (NNPDFpol1.1)

Figure 14 (a,A,x1)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,A,x1)

Figure 14 (a,A,x2)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,A,x2)

Figure 14 (a,B,x1)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,B,x1)

Figure 14 (a,B,x2)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,B,x2)

Figure 14 (a,C,x1)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,C,x1)

Figure 14 (a,C,x2)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,C,x2)

Figure 14 (a,D,x1)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,D,x1)

Figure 14 (a,D,x2)

Leading order extractions from the embedding sample of the x1 and x2 distributions in dijet events for topological bins A-D (a,D,x2)

Figure 14 (b,A,DSSV14)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,A,DSSV14)

Figure 14 (b,B,DSSV14)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,B,DSSV14)

Figure 14 (b,C,DSSV14)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,C,DSSV14)

Figure 14 (b,D,DSSV14)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,D,DSSV14)

Figure 14 (b,A,NNPDF11)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,A,NNPDF11)

Figure 14 (b,B,NNPDF11)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,B,NNPDF11)

Figure 14 (b,C,NNPDF11)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,C,NNPDF11)

Figure 14 (b,D,NNPDF11)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,D,NNPDF11)

Figure 14 (b,A,data)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,A,data)

Figure 14 (b,B,data)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,B,data)

Figure 14 (b,C,data)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,C,data)

Figure 14 (b,D,data)

Dijet asymmetries for the same topological bins in 510 GeV pp collisions (b,D,data)

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