arXiv 1504.017402015-04hep-phhep-ex

用Stoponium探测光阻

Probing Light Stops with Stoponium

Brian Batell, Sunghoon Jung

备注：: 35 pages, 33 figures. v2: references added

摘要：

我们从大型强子对撞机第一次运行的$γγ$、$Z γ$、$ZZ$、$WW$和$hh$通道中的双玻色子共振搜索中推导出了光停止的新限制。如果光阻的两体衰变被适度抑制或运动学禁止，则在$pp$碰撞中将形成stoponium束缚态，随后通过组成光阻的对湮灭衰变到diboson终态，产生惊人的共振特征。值得注意的是，我们发现，stoponium搜索是高度互补的直接对撞机搜索和间接探测光停止，如希格斯耦合测量。利用一个经验夸克偶素势模型，包括前两个$S$ -波stoponium态，我们发现，在退耦极限下，通过最新的共振搜索和间接约束的结合，$m_{\widetilde t_1} \lesssim 130$ GeV被排除在任何终止混合角和重终止质量的值之外。$γγ$搜索是间接约束的最佳补充，探测$h^0 \tilde t_1 \tilde t_1^*$三线性耦合较小的停止“盲点”参数区域。有趣的是，我们还发现，$Zγ$搜索给出了一个更强的约束，$m_{\widetilde t_1} \lesssim 170$ GeV，如果停止主要是左手。对于具有bino LSP和stop NLSP的场景，直接对撞机搜索停止中的几个间隙可以明确地用LHC的下一次运行来填充。对于通过违反R-奇偶性的$UDD$耦合衰减的停止LSP，在直接搜索耦合$λ" \lesssim 10^{-2}$中，停偶素搜索可以填充100 GeV $\lesssim m_{\tilde t_1} \lesssim 200$ GeV的间隙。

英文摘要：

We derive new limits on light stops from diboson resonance searches in the $γγ$, $Z γ$, $ZZ$, $WW$ and $hh$ channels from the first run of the LHC. If the two-body decays of the light stop are mildly suppressed or kinematically forbidden, stoponium bound states will form in $pp$ collisions and subsequently decay via the pair annihilation of the constituent stops to diboson final states, yielding striking resonance signatures. Remarkably, we find that stoponium searches are highly complementary to direct collider searches and indirect probes of light stops such as Higgs coupling measurements. Using an empirical quarkonia potential model and including the first two $S$-wave stoponium states, we find that in the decoupling limit $m_{\widetilde t_1} \lesssim 130$ GeV is excluded for any value of the stop mixing angle and heavy stop mass by the combination of the latest resonance searches and the indirect constraints. The $γγ$ searches are the most complementary to the indirect constraints, probing the stop "blind spot" parameter region in which the $h^0 \tilde t_1 \tilde t_1^*$ trilinear coupling is small. Interestingly, we also find that the $Zγ$ searches give a stronger constraint, $m_{\widetilde t_1} \lesssim 170$ GeV, if the stop is primarily left-handed. For a scenario with a bino LSP and stop NLSP, several gaps in the direct collider searches for stops can unambiguously be filled with the next run of the LHC. For a stop LSP decaying through an R-parity violating $UDD$ coupling, the stoponium searches can fill the gap 100 GeV $\lesssim m_{\tilde t_1} \lesssim 200$ GeV in the direct searches for couplings $λ" \lesssim 10^{-2}$.

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。

摘要：

英文摘要：

相关论文