Data Table

Forward Neutral Pion Transverse Single Spin Asymmetries in p+p Collisions at √s=200 GeV
B.I. Abelev et al, submitted to Phys. Rev. Lett. [arXiv:0801.2990]

Figure 1

(.png eps ) Correlation between pion longitudinal momentum scaled by √s/2 (x_F) and transverse momentum (p_T) for all events. Bins in x_F used in Figs. 2 and 4 are indicated by the vertical lines. There is a strong correlation between x_F and p_T at a single pseudorapidity (η).

Figure 2

(.png eps ) Transverse single spin asymmetries in x_F bins (see Fig. 1) at two different pseudorapidities (<η>). Statistical errors are indicated for each point. Systematic errors are given by the shaded band, excluding normalization uncertainty. The Sivers and twist-3 calculations are described in the text. The inset shows examples of the spin-sorted di-photon invariant mass distributions. The vertical lines mark the π⁰ mass.

A_N(x_F)

E_bin	<η>=3.7				<η>=3.3
[GeV]	<x_F>	A_N	δA_N-stat	δA_N-syst	<x_F>	A_N	δA_N-stat	δA_N-syst
18-22					0.201	0.00087	0.00130	0.0019
22-25	0.237	0.00571	0.00579	0.0063	0.234	0.00213	0.00157	0.0006
25-30	0.283	0.00192	0.00122	0.0004	0.270	0.01021	0.00174	0.0009
30-35	0.322	0.00909	0.00093	0.0004	0.320	0.02726	0.00315	0.0011
35-40	0.371	0.02343	0.00144	0.0004	0.370	0.03917	0.00579	0.0019
40-47	0.427	0.03859	0.00228	0.0008	0.425	0.05333	0.01015	0.0004
47-56	0.501	0.06916	0.00478	0.0004	0.499	0.05989	0.02630	0.0073
56-80	0.598	0.10345	0.01369	0.0051

A_N(-x_F)

E_bin	<η>=3.7				<η>=3.3
[GeV]	<x_F>	A_N	δA_N-stat	δA_N-syst	<x_F>	A_N	δA_N-stat	δA_N-syst
18-22					-0.201	-0.00039	0.00127	0.0020
22-25	-0.237	0.00538	0.00538	0.0067	-0.234	0.00032	0.00153	0.0005
25-30	-0.283	0.00123	0.00123	0.0013	-0.270	0.00229	0.00170	0.0011
30-35	-0.322	0.00095	0.00095	0.0004	-0.320	-0.00454	0.00307	0.0007
35-40	-0.371	0.00147	0.00147	0.0004	-0.370	0.00390	0.00566	0.0021
40-47	-0.427	0.00233	0.00233	0.0009	-0.425	-0.01457	0.00990	0.0027
47-56	-0.501	0.00489	0.00489	0.0014	-0.499	0.01008	0.02574	0.0122
56-80	-0.598	0.01405	0.01405	0.0068

Figure 3

(.png eps ) Transverse single spin asymmetries versus π⁰ transverse momentum (p_T) for events with scaled π⁰ longitudinal momentum |x_F| > 0.4. Errors are as described for Fig. 2.

A_N(p_T) for |x_F| > 0.4

p_T	x_F > 0.4			x_F < -0.4
[GeV/c]	A_N	δA_N-stat	δA_N-syst	A_N	δA_N-stat	δA_N-syst
1.283	0.05070	0.01460	0.0056	-0.00751	0.01682	0.0028
1.500	0.03062	0.01249	0.0042	-0.01051	0.01403	0.0019
1.713	0.02595	0.00543	0.0009	0.00005	0.00561	0.0010
1.901	0.03816	0.00376	0.0010	0.00205	0.00386	0.0013
2.095	0.04785	0.00401	0.0008	0.00374	0.00411	0.0007
2.293	0.05675	0.00512	0.0004	-0.00417	0.00524	0.0024
2.531	0.06055	0.00599	0.0004	-0.00128	0.00612	0.0038
2.902	0.06240	0.00774	0.0012	-0.01195	0.00780	0.0021
3.528	0.05538	0.01231	0.0031	-0.01428	0.01213	0.0025

Figure 4

(.png eps ) Transverse single spin asymmetries versus π⁰ transverse momentum (p_T) in fixed x_F bins (see Fig. 1). Errors are as described for Fig. 2. The Sivers and twist-3 calculations are described in the text.

A_N(p_T) in x_F bins

p_T	0.25 < x_F < 0.30, <x_F>=0.28
[GeV/c]	A_N	δA_N-stat	δA_N-syst
0.9551	0.00598	0.00445	0.0051
1.2645	0.00122	0.00145	0.0008
1.6118	0.00559	0.00184	0.0019
2.0959	0.00954	0.00216	0.0004
2.5249	0.02110	0.00738	0.0035
p_T	0.30 < x_F < 0.35, <x_F>=0.32
[GeV/c]	A_N	δA_N-stat	δA_N-syst
1.0571	0.01380	0.00501	0.0004
1.4669	0.00826	0.00101	0.0004
1.8728	0.01229	0.00221	0.0004
2.4107	0.03089	0.00379	0.0004
2.8514	0.03401	0.00937	0.0016
p_T	0.35 < x_F < 0.40, <x_F>=0.37
[GeV/c]	A_N	δA_N-stat	δA_N-syst
1.2912	0.00817	0.00441	0.0028
1.6959	0.02016	0.00174	0.0004
2.0779	0.03596	0.00290	0.0006
2.6443	0.03959	0.00582	0.0007
3.1814	0.03685	0.01383	0.0029
p_T	0.40 < x_F < 0.47, <x_F>=0.43
[GeV/c]	A_N	δA_N-stat	δA_N-syst
1.5516	0.02623	0.00480	0.0004
1.9819	0.04036	0.00292	0.0011
2.4307	0.04523	0.00474	0.0010
3.2374	0.06155	0.01102	0.0020
p_T	0.47 < x_F < 0.56, <x_F>=0.50
[GeV/c]	A_N	δA_N-stat	δA_N-syst
1.7029	0.07517	0.01347	0.0004
2.2041	0.06459	0.00640	0.0004
2.5861	0.07055	0.00854	0.0004
3.3166	0.08877	0.01598	0.0023
p_T	0.56 < x_F < 0.80, <x_F>=0.60
[GeV/c]	A_N	δA_N-stat	δA_N-syst
2.2962	0.08020	0.01911	0.0056
2.8710	0.11799	0.02392	0.0036
3.5122	0.09162	0.03986	0.0114

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Forward Neutral Pion Transverse Single Spin Asymmetries in p+p Collisions at √s=200 GeVB.I. Abelev et al, submitted to Phys. Rev. Lett. [arXiv:0801.2990]

Figure 1

Figure 2

AN(xF)

AN(-xF)