HEPData

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...
https://www.hepdata.net/record/data/65274yaml https://www.hepdata.net/record/data/65274/csvcsv
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...
https://www.hepdata.net/record/data/65276yaml https://www.hepdata.net/record/data/65276/csvcsv
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...
https://www.hepdata.net/record/data/65277yaml https://www.hepdata.net/record/data/65277/csvcsv
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...
https://www.hepdata.net/record/data/65278yaml https://www.hepdata.net/record/data/65278/csvcsv
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.
https://www.hepdata.net/record/data/65279yaml https://www.hepdata.net/record/data/65279/csvcsv
Table 6

Data from Figure 2b

10.17182/hepdata.73441.v1/t6

Distribution of the product of the TPC reconstructed charge sign and $E_T/p_T$.
https://www.hepdata.net/record/data/65280yaml https://www.hepdata.net/record/data/65280/csvcsv
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.
https://www.hepdata.net/record/data/65281yaml https://www.hepdata.net/record/data/65281/csvcsv
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.
https://www.hepdata.net/record/data/65282yaml https://www.hepdata.net/record/data/65282/csvcsv
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.
https://www.hepdata.net/record/data/65283yaml https://www.hepdata.net/record/data/65283/csvcsv
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.
https://www.hepdata.net/record/data/65284yaml https://www.hepdata.net/record/data/65284/csvcsv
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.
https://www.hepdata.net/record/data/65285yaml https://www.hepdata.net/record/data/65285/csvcsv
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.
https://www.hepdata.net/record/data/65286yaml https://www.hepdata.net/record/data/65286/csvcsv
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.
https://www.hepdata.net/record/data/65287yaml https://www.hepdata.net/record/data/65287/csvcsv

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