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Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at $\sqrt{s}=200$ GeV

The STAR collaboration
Phys.Rev.D 103 (2021) L091103, 2021.

Abstract (data abstract)
We report high-precision measurements of the longitudinal double-spin asymmetry, $A_{LL}$, for midrapidity inclusive jet and dijet production in polarized $pp$ collisions at a center-of-mass energy of $\sqrt{s}=200\,\mathrm{GeV}$. The new inclusive jet data are sensitive to the gluon helicity distribution, $\Delta g(x,Q^2)$, for gluon momentum fractions in the range from $x \simeq 0.05$ to $x \simeq 0.5$, while the new dijet data provide further constraints on the $x$ dependence of $\Delta g(x,Q^2)$. The results are in good agreement with previous measurements at $\sqrt{s}=200\,\mathrm{GeV}$ and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that $\Delta g(x,Q^2)$ is positive for $x > 0.05$.

  • Figure 1 JP2

    Data from Figure 1 (blue)

    10.17182/hepdata.104836.v1/t1

    Jet yield versus jet transverse momentum $p_{T}$ at the detector level and at the parton level. Table includes data for...

  • Figure 1 JP1

    Data from Figure 1 (red)

    10.17182/hepdata.104836.v1/t2

    Jet yield versus jet transverse momentum $p_{T}$ at the detector level and at the parton level. Table includes data for...

  • Figure 2

    Data from Figure 2

    10.17182/hepdata.104836.v1/t3

    Dijet yield versus the dijet $M_{inv}$ at the detector level and at the parton level. Table includes data for the...

  • Table 1 top

    Data from Table 1

    10.17182/hepdata.104836.v1/t4

    Parton inclusive-jet $p_T$ and $A_{LL}$ values with associated uncertainties for jet-$\eta$ region $0.5<|\eta|<1$.

  • Table 1 bottom

    Data from Table 1

    10.17182/hepdata.104836.v1/t5

    Parton inclusive-jet $p_T$ and $A_{LL}$ values with associated uncertainties for jet-$\eta$ region $|\eta|<0.5$.

  • Table 2 top

    Data from Table 2 (Figure 4)

    10.17182/hepdata.104836.v1/t6

    Parton dijet invariant mass $M_{inv}$ and $A_{LL}$ values with associated uncertainties for the $\textrm{sign}(\eta_1) = \textrm{sign}(\eta_2)$ topology.

  • Table 2 bottom

    Data from Table 2 (Figure 4)

    10.17182/hepdata.104836.v1/t7

    Parton dijet invariant mass $M_{inv}$ and $A_{LL}$ values with associated uncertainties for the $\textrm{sign}(\eta_1) \neq \textrm{sign}(\eta_2)$ topology.

  • Figure 3

    Data from Figure 3

    10.17182/hepdata.104836.v1/t8

    Parton inclusive-jet $p_T$, $x_T$, and $A_{LL}$ values with associated uncertainties for jet-$\eta$ region $|\eta|<1$.

  • Table 1 Supplemental Material

    Data from Table 1 in Supplemental Material

    10.17182/hepdata.104836.v1/t9

    The correlation matrix for the point-to-point uncertainties for inclusive jet measurements with jets in the $0.5<|\eta|<1$ region. The $A_{LL}$ uncertainty...

  • Table 2 Supplemental Material

    Data from Table 2 in Supplemental Material

    10.17182/hepdata.104836.v1/t10

    The correlation matrix for the point-to-point uncertainties for inclusive jet measurements with jets in the $|\eta|<0.5$ region. The $A_{LL}$ uncertainty...

  • Table 3 Supplemental Material

    Data from Table 3 in Supplemental Material

    10.17182/hepdata.104836.v1/t11

    The correlation matrix for the point-to-point uncertainties for inclusive jet measurements with jets in the $|\eta|<1$ region. The $A_{LL}$ uncertainty...

  • Table 4 Supplemental Material

    Data from Table 4 in Supplemental Material

    10.17182/hepdata.104836.v1/t12

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $|\eta|<0.5$ region and jets in...

  • Table 5 Supplemental Material

    Data from Table 5 in Supplemental Material

    10.17182/hepdata.104836.v1/t13

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $0.5<|\eta|<1$ region with dijet measurements...

  • Table 6 Supplemental Material

    Data from Table 6 in Supplemental Material

    10.17182/hepdata.104836.v1/t14

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $0.5<|\eta|<1$ region with dijet measurements...

  • Table 7 Supplemental Material

    Data from Table 7 in Supplemental Material

    10.17182/hepdata.104836.v1/t15

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $|\eta|<0.5$ region with dijet measurements...

  • Table 8 Supplemental Material

    Data from Table 8 in Supplemental Material

    10.17182/hepdata.104836.v1/t16

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $|\eta|<0.5$ region with dijet measurements...

  • Table 9 Supplemental Material

    Data from Table 9 in Supplemental Material

    10.17182/hepdata.104836.v1/t17

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $|\eta|<1$ region with dijet measurements...

  • Table 10 Supplemental Material

    Data from Table 10 in Supplemental Material

    10.17182/hepdata.104836.v1/t18

    The correlation matrix for the point-to-point uncertainties coupling inclusive jet measurements with jets in the $|\eta|<1$ region with dijet measurements...

  • Table 11 Supplemental Material

    Data from Table 11 in Supplemental Material

    10.17182/hepdata.104836.v1/t19

    The correlation matrix for the point-to-point uncertainties for dijet measurements with the $\textrm{sign}(\eta_1) = \textrm{sign}(\eta_2)$ topology. The $A_{LL}$ uncertainty contribution...

  • Table 12 Supplemental Material

    Data from Table 12 in Supplemental Material

    10.17182/hepdata.104836.v1/t20

    The correlation matrix for the point-to-point uncertainties for dijet measurements with the $\textrm{sign}(\eta_1) \neq \textrm{sign}(\eta_2)$ topology. The $A_{LL}$ uncertainty contribution...

  • Table 13 Supplemental Material

    Data from Table 13 in Supplemental Material

    10.17182/hepdata.104836.v1/t21

    The correlation matrix for the point-to-point uncertainties coupling dijet measurements with the $\textrm{sign}(\eta_1) \neq \textrm{sign}(\eta_2)$ topology and the $\textrm{sign}(\eta_1) =...

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