Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV

The PHENIX collaboration
Phys.Rev.D 79 (2009) 012003, 2009.

Abstract (data abstract)
The PHENIX experiment presents results from the RHIC 2006 run with polarized $p + p$ collisions at $\sqrt{s}$ = 62.4 GeV, for inclusive $\pi^0$ production at mid-rapidity. Unpolarized cross section results are measured for transverse momenta $p_T$ = 0.5 to 7 GeV/$c$. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. Double helicity asymmetries ALL are presented for $p_T$ = 1 to 4 GeV/$c$ and probe the higher range of Bjorken $x$ of the gluon ($x_g$) with better statistical precision than our previous measurements at $\sqrt{s}$ = 200 GeV. These measurements are sensitive to the gluon production in the proton for 0.06 < $x_g$ < 0.4.

  • Figure 1

    Data from Figure 1 of Phys. Rev. D 79, 012003 (2009)

    10.17182/hepdata.142076.v1/t1

    The fraction of inclusive $\pi^0$ yield which satisfied the BBC trigger condition.

  • Figure 3

    Data from Figure 3 of Phys. Rev. D 79, 012003 (2009)

    10.17182/hepdata.142076.v1/t2

    The neutral pion production cross section at $\sqrt{s}$ = 62.4 GeV as a function of $p_T$ and the results of...

  • Figure 4

    Data from Figure 4 of Phys. Rev. D 79, 012003 (2009)

    10.17182/hepdata.142076.v1/t3

    The parameter $n$ obtained from the ratio of invariant cross section at $\sqrt{s}$ = 62.4 GeV and $\sqrt{s}$ = 200GeV,...

  • Table 5

    Data from Table.5 of Phys. Rev. D 79, 012003 (2009)

    10.17182/hepdata.142076.v1/t4

    The double helicity asymmetry for neutral pion production at $\sqrt{s}$ = 62.4 GeV as a function $p_T$ (GeV/$c$). Error bars...

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