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arXiv 1206.3987hep-ph
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非最小宇宙额外维度:大型强子对撞机的强相互作用扇区

Non-minimal Universal Extra Dimensions: The strongly interacting sector at the Large Hadron Collider

AseshKrishna Datta, Kenji Nishiwaki, Saurabh Niyogi

摘要:

在存在膜定域动力学项和Yukawa项的情况下,计算了一个平坦额外空间维在S^1/Z_2上轨道折叠的非最小普适额外维(nmUED)方案的强相互作用扇区.在紧化中,这些项被认为对卡鲁扎-克莱因(KK)激发的质量和耦合有重要的、非平凡的影响。我们研究了1级KK胶子和夸克的质量,找到了包含这些粒子的修正的强相互作用顶点。该方案保持KK平价。从不同的KK-水平的夸克之间的显着水平混合的可能性指出,特别是提到顶夸克部门。在大型强子对撞机(LHC)上,通过在MadGraph-5中实现该方案,并借助于FeynRules,计算了包含第一级KK胶子和前两代KK夸克的各种一般末态的截面.研究了强相互作用和弱相互作用KK激发的衰变分支分数,以估计涉及喷流、轻子和丢失能量的各种不同终态的产额。这些是用来把一些保守的约束nmUED参数空间使用最新的LHC数据。的细微差别的情况下,阐明参考最小的通用额外的维度(MUED)和超对称性(SUSY)和它们的影响,大型强子对撞机进行了讨论。

英文摘要:

We work out the strongly interacting sector of a non-minimal Universal Extra Dimension (nmUED) scenario with one flat extra spatial dimension orbifolded on S^1/Z_2 in the presence of brane-localized kinetic and Yukawa terms. On compactification, these terms are known to have significant, nontrivial impact on the masses and the couplings of the Kaluza-Klein (KK) excitations. We study the masses of the level `1' KK gluon and the quarks and find the modified strong interaction vertices involving these particles. The scenario conserves KK parity. Possibility of significant level-mixing among the quarks from different KK-levels is pointed out with particular reference to the top quark sector. Cross sections for various generic final states involving level `1' KK-gluon and KK-quarks from first two generations are estimated at the Large Hadron Collider (LHC) via an implementation of the scenario in MadGraph-5 with the help of FeynRules. The decay branching fractions of both strong and weakly interacting KK excitations are studied to estimate yields in various different final states involving jets, leptons and missing energy. These are used to put some conservative constraints on the nmUED parameter space using the latest LHC data. Nuances of the scenario are elucidated with reference to the minimal Universal Extra Dimension (mUED) and Supersymmetry (SUSY) and their implications for the LHC are discussed.

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。

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