Inclusive $\pi^0$, $\eta$, and direct photon production at high transverse momentum in $p+p$ and $d+$Au collisions at $\sqrt{s_{NN}}=200$ GeV - INSPIRE

DataBETA

Inclusive $\pi^0$ , $\eta$ , and direct photon production at high transverse momentum in $p+p$ and $d+$ Au collisions at $\sqrt{s_{NN}}=200$ GeV

STAR

Collaboration

•

B.I. Abelev
(
- Illinois U., Chicago
)

Dec, 2009

26 pages

Published in:

Phys.Rev.C 81 (2010) 064904

e-Print:

0912.3838 [hep-ex]

DOI:

10.1103/PhysRevC.81.064904

Experiments:

BNL-RHIC-STAR

View in:

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Abstract: (arXiv)

We report a measurement of high-p_T inclusive pi^0, eta, and direct photon production in p+p and d+Au collisions at sqrt(s_NN) = 200 GeV at midrapidity (0 < eta < 1). Photons from the decay pi^0 -> gamma gamma were detected in the Barrel Electromagnetic Calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The eta -> gamma gamma decay was also observed and constituted the first eta measurement by STAR. The first direct photon cross section measurement by STAR is also presented, the signal was extracted statistically by subtracting the pi^0, eta, and omega(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading order perturbative QCD calculations.

Note:

28 pages, 30 figures, 6 tables, the updated version that was accepted by Phys. Rev. C

13.85.Ni
13.87.Fh
13.85.Qk
25.75.-q
OSG : STAR
photon: direct production
pi0: hadroproduction
eta: hadroproduction
quantum chromodynamics: perturbation theory
STAR

References(63)

Figures(0)

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