arXiv 1201.43962012-01-20hep-phhep-ex

在LHC上测试CDF的双喷射过量的技术颜色解释

Testing the Technicolor Interpretation of CDF's Dijet Excess at the LHC

Estia Eichten, Kenneth Lane, Adam Martin, Eric Pilon

备注：: 24 pages, 24 figures

摘要：

假设CDF合作组在Wjj生产中发现的150 Gev附近的双喷流过剩是由于低尺度人工色过程$ρ_T \rightarrow W π_T$中最轻的technipion，我们用1- 20反飞秒的数据研究了它在LHC探测器中的可观测性。我们描述了有趣的新的运动学测试，可以提供独立的确认这个LSTC假设。我们发现，类似于CDF和最近ATLAS所采用的切割，不能确认dijet信号。我们建议削减量身定制的LSTC假设和它的背景在LHC可能会揭示$ρ_T \rightarrow \ellνjj$。对同位旋相关通道$ρ^{pm}_T \rightarrow Z π^{pm}_T \rightarrow \ell^+ \ell^- jj$和$ρ^{pm}_T \rightarrow WZ$在轻子加中微子和双轻子加双喷流三种模式中的观测将是对CDF信号的LSTC解释的重要证实。$Zπ_T$信道在实验上比$Wπ_T$更干净，并且其速率通过相空间从$Wπ_T$已知。它可以被发现或排除与对撞机数据预计在2012年。$WZ \rightarrow 3\ellν$通道是所有通道中最干净的，其速率由$Wπ_T$和LSTC参数$\sinχ$确定。该通道和$WZ \rightarrow \ell^+\ell^- jj$作为$\sinχ$的函数进行讨论。

英文摘要：

Under the assumption that the dijet excess seen by the CDF Collaboration near 150 Gev in Wjj production is due to the lightest technipion of the low-scale technicolor process $ρ_T \rightarrow W π_T$, we study its observability in LHC detectors with 1--20 inverse femtobarns of data. We describe interesting new kinematic tests that can provide independent confirmation of this LSTC hypothesis. We find that cuts similar to those employed by CDF, and recently by ATLAS, cannot confirm the dijet signal. We propose cuts tailored to the LSTC hypothesis and its backgrounds at the LHC that may reveal $ρ_T \rightarrow \ellνjj$. Observation of the isospin-related channel $ρ^{pm}_T \rightarrow Z π^{pm}_T \rightarrow \ell^+ \ell^- jj$ and of $ρ^{pm}_T \rightarrow WZ$ in the three lepton plus neutrino and dilepton plus dijet modes will be important confirmations of the LSTC interpretation of the CDF signal. The $Zπ_T$ channel is experimentally cleaner than $Wπ_T$ and its rate is known from $Wπ_T$ by phase space. It can be discovered or excluded with the collider data expected in 2012. The $WZ \rightarrow 3\ellν$ channel is cleanest of all and its rate is determined from $Wπ_T$ and the LSTC parameter $\sinχ$. This channel and $WZ \rightarrow \ell^+\ell^- jj$ are discussed as a function of $\sinχ$.

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