在200次GeV p+p碰撞中测量韧致辐射光子
Measuring Bremsstrahlung Photons in 200 GeV p+p Collisions
摘要：
在重离子碰撞中，直接光子产生是一个重要的可观测现象，因为光子是穿透的，因此对导致喷流淬灭的终态效应基本上不敏感。在p+p碰撞和Au+Au碰撞中，对促使光子产额的碎裂分量的测量将为pQCD预测和对重离子碰撞中该分量的修正预测提供重要的检验。利用强子-光子关联选择与近侧喷流相关的光子，可以直接测量碎裂光子。
英文摘要：
Direct photon production is an important observable in heavy ion collisions as photons are penetrating and therefore largely insensetive to final state effects that lead to jet quenching. Measurements of the fragmentation component to prompt photon yields in p+p and Au+Au collisions will provide both an important test of pQCD predictions and of predictions for modifications of this component in heavy ion collisions. By selecting photons associated with jets on the near side using hadron-photon correlations, fragmentation photons can be measured directly.
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