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arXiv 1407.7529hep-phhep-ex
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重新审视LHC的单顶生产

Revisiting monotop production at the LHC

Idir Boucheneb, Giacomo Cacciapaglia, Aldo Deandrea, Benjamin Fuks

摘要:

新物理学的场景中,一个顶夸克可以产生与大的失踪能量(monotop)最近已经从理论的角度和实验合作的研究。我们通过在SU(2)L不变形式中嵌入顶夸克的有效耦合,重新审视了最初提出的单顶设置。我们表明,极小选择一个模型为每个可能的生产机制:一个标量场耦合到右手顶夸克和一个不可见的费米子时,monotop系统是共振产生的,和一个矢量场介导的相互作用的暗扇区右手夸克的非共振生产模式。我们详细研究第二类的情况下,来自标准的单顶过程的贡献时,调解人比顶夸克轻,从暗物质遗迹丰度时,调解人比顶夸克重的限制。

英文摘要:

Scenarios of new physics where a single top quark can be produced in association with large missing energy (monotop) have been recently studied both from the theoretical point of view and by experimental collaborations. We revisit the originally proposed monotop setup by embedding the effective couplings of the top quark in an SU(2)L invariant formalism. We show that minimality selects one model for each of the possible production mechanisms: a scalar field coupling to a right-handed top quark and an invisible fermion when the monotop system is resonantly produced, and a vector field mediating the interactions of a dark sector to right-handed quarks for the non-resonant production mode. We study in detail constraints on the second class of scenarios, originating from contributions to standard single top processes when the mediator is lighter than the top quark and from the dark matter relic abundance when the mediator is heavier than the top quark.

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