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Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC

The STAR collaboration
Phys.Rev.Lett. 113 (2014) 072301, 2014.

Abstract (data abstract)
BNL-RHIC. We report measurements of single- and double- spin asymmetries for $W^{\pm}$ and $Z/\gamma^*$ boson production in longitudinally polarized $p+p$ collisions at $\sqrt{s} = 510$ GeV by the STAR experiment at RHIC. The asymmetries for $W^{\pm}$ were measured as a function of the decay lepton pseudorapidity, which provides a theoretically clean probe of the proton's polarized quark distributions at the scale of the $W$ mass. The results are compared to theoretical predictions, constrained by recent polarized deep inelastic scattering measurements, and show a preference for a sizable, positive up antiquark polarization in the range $0.05<x<0.2$.

  • Table 1

    Data from Figure 1

    10.17182/hepdata.73441.v1/t1

    $E_T^e$ distribution of $W^{\pm}$ candidate events, background contributions, and sum of backgrounds and W -> ev MC signal. This plot...

  • Table 2

    Data from Figure 1

    10.17182/hepdata.73441.v1/t2

    $E_T^e$ distribution of $W^{\pm}$ candidate events, background contributions, and sum of backgrounds and W -> ev MC signal. This plot...

  • Table 3

    Data from Figure 1

    10.17182/hepdata.73441.v1/t3

    $E_T^e$ distribution of $W^{\pm}$ candidate events, background contributions, and sum of backgrounds and W -> ev MC signal. This plot...

  • Table 4

    Data from Figure 1

    10.17182/hepdata.73441.v1/t4

    $E_T^e$ distribution of $W^{\pm}$ candidate events, background contributions, and sum of backgrounds and W -> ev MC signal. This plot...

  • Table 5

    Data from Figure 2a

    10.17182/hepdata.73441.v1/t5

    Signed $P_T$-balance distribution for e+/e- candidates reconstructed in the EEMC.

  • Table 6

    Data from Figure 2b

    10.17182/hepdata.73441.v1/t6

    Distribution of the product of the TPC reconstructed charge sign and $E_T/p_T$.

  • Table 7

    Data from Figure 3

    10.17182/hepdata.73441.v1/t7

    Distribution of the invariant mass of Z/$\gamma^*$ -> e+ e- candidate events, with MC for comparison.

  • Table 8

    Data from Figure 4

    10.17182/hepdata.73441.v1/t8

    Longitudinal single-spin asymmetry $A_L$ for W+ production as a function of lepton pseudorapidity.

  • Table 9

    Data from Figure 4

    10.17182/hepdata.73441.v1/t9

    Longitudinal single-spin asymmetry $A_L$ for W- production as a function of lepton pseudorapidity.

  • Table 10

    Data from Figure 4

    10.17182/hepdata.73441.v1/t10

    Longitudinal single-spin asymmetry $A_L$ for W+ production as a function of lepton pseudorapidity.

  • Table 11

    Data from Figure 5

    10.17182/hepdata.73441.v1/t11

    Longitudinal double-spin asymmetry $A_{LL}$ for W+ production as a function of lepton pseudorapidity.

  • Table 12

    Data from Figure 5

    10.17182/hepdata.73441.v1/t12

    Longitudinal double-spin asymmetry $A_{LL}$ for W- production as a function of lepton pseudorapidity.

  • Table 13

    Data from Figure 5

    10.17182/hepdata.73441.v1/t13

    Longitudinal double-spin asymmetry $A_{LL}$ for theory $W^{+/-}$ production as a function of lepton pseudorapidity.

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