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arXiv 1408.2841hep-phhep-ex
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LSP特性对LHC Slepton河段的影响

Impact of LSP Character on Slepton Reach at the LHC

Jonathan Eckel, Michael J. Ramsey-Musolf, William Shepherd, Shufang Su

摘要:

在大型强子对撞机(LHC)上对超对称性的研究极大地限制了与色超伴子相关的参数空间,而对色单态超伴子的限制则不那么严重。在这项研究中,我们调查的最轻的超对称粒子(LSP)的性质的slepton衰变分支分数的依赖。特别是在类希格斯诺LSP的情况下,两个衰变分支分数的$\tilde\ell_L$和$\tildeν_\ell$强烈依赖于$M_1/M_2$的符号和值,这有很强的影响范围的双轻子加上MET搜索slepton对生产。我们扩展的实验结果相同的味道,相反的符号双轻子加MET搜索在8 TeV的LHC各种LSP的情况。我们发现,LHC边界上的slepton强烈增强了非比诺类LSP:95%C. L。$m_{\tilde\ell_L}$的极限从类Bino LSP的300 GeV扩展到类Wino LSP的约370 GeV。具有类Higgsino LSP的$\tilde\ell_L$的束缚对于$M_1/M_2$~$-\tan^2θ_W$是最强的(~490 GeV),对于$M_1/M_2$~$\tan^2θ_W$是最弱的(~220 GeV)。我们还计算了在14 TeV LHC的预期slepton搜索范围。采用100 fb $^{-1}$集成光度,预计95% C. L.在最乐观(悲观)的情况下,左手slepton的质量范围从类Bino(类Wino)LSP的550(670)GeV变化到类Higgsino LSP的900(390)GeV。右手slepton的能量范围约为440 GeV。相应的5 $σ$发现灵敏度约小100 GeV。对于300 fb的$^{-1}$积分光度,达到约50 - 100 GeV高。

英文摘要:

Searches for supersymmetry at the Large Hadron Collider (LHC) have significantly constrained the parameter space associated with colored superpartners, whereas the constraints on color-singlet superpartners are considerably less severe. In this study, we investigate the dependence of slepton decay branching fractions on the nature of the lightest supersymmetric particle (LSP). In particular, in the Higgsino-like LSP scenarios, both decay branching fractions of $\tilde\ell_L$ and $\tildeν_\ell$ depend strongly on the sign and value of $M_1/M_2$, which has strong implications for the reach of dilepton plus MET searches for slepton pair production. We extend the experimental results for same flavor, opposite sign dilepton plus MET searches at the 8 TeV LHC to various LSP scenarios. We find that the LHC bounds on sleptons are strongly enhanced for a non-Bino-like LSP: the 95% C.L. limit for $m_{\tilde\ell_L}$ extends from 300 GeV for a Bino-like LSP to about 370 GeV for a Wino-like LSP. The bound for $\tilde\ell_L$ with a Higgsino-like LSP is the strongest (~ 490 GeV) for $M_1/M_2$ ~ $-\tan^2θ_W$ and is the weakest (~ 220 GeV) for $M_1/M_2$ ~ $\tan^2θ_W$. We also calculate prospective slepton search reaches at the 14 TeV LHC. With 100 fb$^{-1}$ integrated luminosity, the projected 95% C.L. mass reach for the left-handed slepton varies from 550 (670) GeV for a Bino-like (Wino-like) LSP to 900 (390) GeV for a Higgsino-like LSP under the most optimistic (pessimistic) scenario. The reach for the right-handed slepton is about 440 GeV. The corresponding 5$σ$ discovery sensitivity is about 100 GeV smaller. For 300 fb$^{-1}$ integrated luminosity, the reach is about 50 - 100 GeV higher.

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