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arXiv 0711.4145nucl-ex
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利用RHIC的PHENIX实验在sqrt(s_NN)= 200 GeV的Au+Au碰撞中通过转换对的光子测量

Measurement of photons via conversion pairs in Au+Au collisions at sqrt(s_NN) = 200 GeV with the PHENIX experiment at RHIC

Torsten Dahms

摘要:

热光子可以提供在RHIC中产生的新物质状态的温度信息。在1- 3GeV/c的p_T区,热光子是主要的直接光子源。因此,如果可以达到足够的精度,则应在双比率(gamma/gamma(pi^0))_{Measured}/(gamma/gamma(pi^0))_{Simulated}中看到由于热光子贡献而导致的与纯衰变光子信号相比的可能过量。我们提出了一种通过测量来自外部光子转换的e^+e^-对来重建直接光子的方法。

英文摘要:

Thermal photons can provide information on the temperature of the new state of matter created at RHIC. In the p_T region of 1--3 GeV/c thermal photons are expected to be the dominant direct photon source. Therefore, a possible excess compared to a pure decay photon signal due to a thermal photon contribution should be seen in the double ratio (gamma/gamma(pi^0))_{Measured}/(gamma/gamma(pi^0))_{Simulated}, if sufficient accuracy can be reached. We present a method to reconstruct direct photons by measuring e^+e^- pairs from external photon conversions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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