$p$ $p$ --> Direct Photon
midrapidity
Max results
Sort by Reverse order

Showing 1 of 1 results

Measurement of direct photon production in p + p collisions at s**(1/2) = 200-GeV.

The PHENIX collaboration Adler, S.S. ; Afanasiev, S. ; Aidala, C. ; et al.
Phys.Rev.Lett. 98 (2007) 012002, 2007.
Inspire Record 726259 DOI 10.17182/hepdata.143523

Cross sections for mid-rapidity production of direct photons in p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for 3 < p_T < 16 GeV/c. Next-to-leading order (NLO) perturbative QCD (pQCD) describes the data well for p_T > 5 GeV/c, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for p_T > 7 GeV/c.

3 data tables
Figure 2

Direct photon spectra with NLO pQCD calculations for three theory scales, $\mu$ and a comparison to the NLO pQCD calculations for $\mu$ = $p_T$.

Figure 3a

Ratio of isolated direct photons to all direct photons from the $\pi^0$-tagging method.

Figure 3b

Ratio of isolated direct photons to all direct photons from the $\pi^0$-tagging method.