在CDF双光子通道中寻找Randall-Sundrum引力子
Search for Randall-Sundrum Gravitons in the Diphoton Channel at CDF
摘要：
我们报告的搜索新粒子的双光子通道中使用的数据样本的$p\bar p$碰撞在$\sqrt{s} = 1.96$ TeV收集的CDF II探测器在费米实验室Tevatron，与5.4 FB $^{-1}$的积分亮度。数据的双光子不变质谱与标准模型的预期吻合得很好。我们设定了兰德尔-桑德拉姆引力子的产生截面乘以分支比的上限，作为双光子质量的函数。随后，我们推导出459 GeV $/c^{2}$和963 GeV $/c^{2}$的引力子质量的下限，在95%的置信水平，耦合参数（$k/\bar{M}_{Pl}$）分别为0.01和0.1。
英文摘要：
We report on a search for new particles in the diphoton channel using a data sample of $p\bar p$ collisions at $\sqrt{s} = 1.96$ TeV collected by the CDF II detector at the Fermilab Tevatron, with an integrated luminosity of 5.4 fb$^{-1}$. The diphoton invariant mass spectrum of the data agrees well with the standard model expectation. We set upper limits on the production cross section times branching ratio for the Randall-Sundrum graviton, as a function of diphoton mass. We subsequently derive lower limits on the graviton mass of 459 GeV$/c^{2}$ and 963 GeV$/c^{2}$, at the 95% confidence level, for coupling parameters ($k/\bar{M}_{Pl}$) of 0.01 and 0.1 respectively.
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