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Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
Phys Rev Lett. 2007 Jan 5;98(1):012002. doi: 10.1103/PhysRevLett.98.012002.
Cross sections for midrapidity production of direct photons in p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for transverse momenta of 3 < pT < 16 GeV/c. Next-to-leading order perturbative QCD (pQCD) describes the data well for pT >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 pT >7 GeV/c.
报道了相对论重离子对撞机（RHIC）上质子-质子碰撞中直接光子在中快度产生的横截面积，横动量范围为3 < pT < 16 GeV/c。对于pT >5 GeV/c，次领头阶微扰量子色动力学（pQCD）能很好地描述数据，此时测量和理论的不确定性相当。我们还报告了要求光子与部分子喷注能量隔离的效果。对于pT >7 GeV/c，pQCD能很好地描述观测到的隔离光子的份额。
