Abstract

We report precision measurements of the Feynman-x dependence, and first measurements of the transverse momentum dependence, of transverse single spin asymmetries for the production of \pi^0 mesons from polarized proton collisions at \sqrt{s}=200 GeV. The x_F dependence of the results are in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p_T dependence at fixed x_F are not consistent with pQCD-based calculations.

Table for Figure 2 < eta > =3.7 and x_F > 0.

10.17182/hepdata.97117.v1/t1

Analyzing powers A_N(x_F) in x_F bins at < eta > =3.7 and x_F > 0.
Table for Figure 2 < eta > =3.3 and x_F > 0.

10.17182/hepdata.97117.v1/t2

Analyzing powers A_N(x_F) in x_F bins at < eta > =3.3 and x_F > 0.
Table for Figure 2 < eta > =3.7 and x_F < 0.

10.17182/hepdata.97117.v1/t3

Analyzing powers A_N(-x_F) in x_F bins at < eta > =3.7 and x_F < 0.
Table for Figure 2 < eta > =3.3 and x_F < 0.

10.17182/hepdata.97117.v1/t4

Analyzing powers A_N(-x_F) in x_F bins at < eta > =3.3 and x_F < 0.
Table for Figure 3 x_F > 0.4.

10.17182/hepdata.97117.v1/t5

Analyzing powers versus pi^0 transverse momentum (p_T) for events with scaled pi^0 longitudinal momentum x_F > 0.4.
Table for Figure 3 x_F < -0.4.

10.17182/hepdata.97117.v1/t6

Analyzing powers versus pi^0 transverse momentum (p_T) for events with scaled pi^0 longitudinal momentum x_F < -0.4.
Table for Figure 4 0.25 < x_F < 0.30.

10.17182/hepdata.97117.v1/t7

Analyzing powers versus pi^0 transverse momentum (p_T) in 0.25 < x_F < 0.30 bin.
Table for Figure 4 0.30 < x_F < 0.35.

10.17182/hepdata.97117.v1/t8

Analyzing powers versus pi^0 transverse momentum (p_T) in 0.30 < x_F < 0.35 bin.
Table for Figure 4 0.35 < x_F < 0.40.

10.17182/hepdata.97117.v1/t9

Analyzing powers versus pi^0 transverse momentum (p_T) in 0.35 < x_F < 0.40 bin.
Table for Figure 4 0.40 < x_F < 0.47.

10.17182/hepdata.97117.v1/t10

Analyzing powers versus pi^0 transverse momentum (p_T) in 0.40 < x_F < 0.47 bin.
Table for Figure 4 0.47 < x_F < 0.56.

10.17182/hepdata.97117.v1/t11

Analyzing powers versus pi^0 transverse momentum (p_T) in 0.47 < x_F < 0.56 bin.
Table for Figure 4 0.56 < x_F < 0.80.

10.17182/hepdata.97117.v1/t12

Analyzing powers versus pi^0 transverse momentum (p_T) in 0.56 < x_F < 0.80 bin.

Table for Figure 2 < eta > =3.7 and x_F > 0.

Table for Figure 2 < eta > =3.3 and x_F > 0.

Table for Figure 2 < eta > =3.7 and x_F < 0.

Table for Figure 2 < eta > =3.3 and x_F < 0.

Table for Figure 3 x_F > 0.4.

Table for Figure 3 x_F < -0.4.

Table for Figure 4 0.25 < x_F < 0.30.

Table for Figure 4 0.30 < x_F < 0.35.

Table for Figure 4 0.35 < x_F < 0.40.

Table for Figure 4 0.40 < x_F < 0.47.

Table for Figure 4 0.47 < x_F < 0.56.

Table for Figure 4 0.56 < x_F < 0.80.

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