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arXiv 0912.0217hep-ph
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T宇称破坏的最小Higgs模型中LHC处的双轻子和四轻子信号

Dilepton and Four-Lepton Signals at the LHC in the Littlest Higgs Model with T-parity Violation

Satyanarayan Mukhopadhyay, Biswarup Mukhopadhyaya, Andreas Nyffeler

摘要:

在T宇称破坏的Wess-Zumino-Witten(WZW)反常项存在下,T宇称最小Higgs模型(LHT)中稳定的重光子AH要么衰变为标准模型(SM)规范玻色子对,要么通过圈图衰变为SM费米子.本文详细研究了由反号同味双轻子或四轻子通道中的不变质量峰重建A_H的对撞机签名。这使我们能够获得有关LHT中基本对称破缺尺度f的信息,从而获得该理论的低质量谱。此外,WZW项的存在的指示给了我们暗示可能的紫外线完成的LHT通过强动力学。关键的观察是,所有重T奇夸克对的产生过程的总和在LHC上具有相当大的截面,并且这些T奇粒子最终都级联衰变到重光子A_H。我们表明,对于某些区域的参数空间,无论是一个小的f约为500 GeV或相对较轻的T奇夸克的质量约为400 GeV,人们可以重建的A_H,即使在早期的LHC运行\sqrt{s} =10 TeV和适度的积分亮度为200 pb^{-1}。在\sqrt{s} = 14 TeV,积分亮度为30 fb^{-1}时,可以覆盖LHT的大部分典型参数空间,尺度f可达1.5 TeV,奇夸克质量几乎可达1 TeV。在这个参数空间区域内,重建的A_H的质量在66 GeV到230 GeV之间。

英文摘要:

In the presence of the T-parity violating Wess-Zumino-Witten (WZW) anomaly term, the otherwise stable heavy photon A_H in the Littlest Higgs model with T-parity (LHT) decays to either Standard Model (SM) gauge boson pairs, or to SM fermions via loop diagrams. We make a detailed study of the collider signatures where the A_H can be reconstructed from invariant mass peaks in the opposite sign same flavor dilepton or the four-lepton channels. This enables us to obtain information about the fundamental symmetry breaking scale f in the LHT and thereby the low-lying mass spectrum of the theory. In addition, indication of the presence of the WZW term gives us hints of the possible UV completion of the LHT via strong dynamics. The crucial observation is that the sum of all production processes of heavy T-odd quark pairs has a sizeable cross-section at the LHC and these T-odd particles eventually all cascade decay down to the heavy photon A_H. We show that for certain regions of the parameter space with either a small f of around 500 GeV or relatively light T-odd quarks with a mass of around 400 GeV, one can reconstruct the A_H even at the early LHC run with \sqrt{s}=10 TeV and a modest integrated luminosity of 200 pb^{-1}. At \sqrt{s} = 14 TeV and with an integrated luminosity of 30 fb^{-1}, it is possible to cover a large part of the typical parameter space of the LHT, with the scale f up to 1.5 TeV and with T-odd quark masses almost up to 1 TeV. In this region of the parameter space, the mass of the reconstructed A_H ranges from 66 GeV to 230 GeV.

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