Inclusive π0, η, and direct photon production at high transverse momentum in p+p and d+Au collisions at √sNN=200 GeV

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2010) Inclusive π0, η, and direct photon production at high transverse momentum in p+p and d+Au collisions at √sNN=200 GeV. Physical Review C, 81 (6). pp. 64904-26. ISSN 0556-2813

[img]
Preview
PDF - Published Version
Language: English

Download (1MB) | Preview

Abstract

We report a measurement of high-pT inclusive π0, η, and direct photon production in p+p and d+Au collisions at √sNN=200 GeV at midrapidity (0<η<1). Photons from the decay π0→γγ were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The η→γγ decay was also observed and constituted the first η measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the π0, η, and ω(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.

Item Type: Article
Keywords: photon, direct production pi0, hadroproduction eta, hadroproduction quantum chromodynamics, perturbation theory STAR transverse momentum, high Brookhaven RHIC Coll background p p, inclusive reaction heavy ion, scattering deuteron gold pseudoscalar meson, radiative decay differential cross section, transverse momentum yield, ratio 200 GeV-cms/nucleon
Date: June 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jun 2014 08:16
Last Modified: 24 Feb 2016 15:31
URI: http://digre.pmf.unizg.hr/id/eprint/2309

Actions (login required)

View Item View Item