Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC
Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC
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DOI：
10.1088/1126-6708/2008/04/090
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发表时间：
2007-12
影响因子：
5.4
通讯作者：
Jeffrey R. Forshaw;J. Gunion;L. Hodgkinson;A. Papaefstathiou;A. Papaefstathiou;A. Pilkington
中科院分区：
文献类型：
--
作者：
Jeffrey R. Forshaw;J. Gunion;L. Hodgkinson;A. Papaefstathiou;A. Papaefstathiou;A. Pilkington
解决 mu 问题的最简单的超对称模型是次最小超对称标准模型 (NMSSM)，其中无需微调 GUT 尺度参数即可预测低尺度下 Z 玻色子质量的正确值。然而，为了不存在微调，最轻的 CP 希格斯玻色子 h 应该具有与 100 GeV 和 SM 耦合相似的质量来测量玻色子和费米子。与 LEP 限制一致的唯一方法是 h 主要通过 h --> aa --> tau(+)tau(-)tau(+)tau(-) 或 4j 而不是 4b 衰减，其中 a 是 NMSSM 中存在的两个伪标量希格斯中较轻的一个。有趣的是，m(a) 2m(tau) 更受青睐。因此，h --> tau(+)tau(-)tau(+)tau(-) 成为感兴趣的关键模式。与此同时，NMSSM 的所有其他希格斯玻色子通常都相当重。在这种优选情况下，使用传统通道检测大型强子对撞机上的任何 NMSSM 希格斯玻色子将非常具有挑战性。在本文中，我们证明，如果希格斯粒子是在 pp --> p + h + p 过程中产生的，并且使用适当安装的前向探测器测量最终态质子，则 h --> aa --> tau(+)tau(-)tau(+)tau(-) 衰变链应该是可见的。此外，我们表明 h 和 a 的质量可以在逐个事件的基础上确定。
The simplest supersymmetric model that solves the mu problem and in which the GUT-scale parameters need not be finely tuned in order to predict the correct value of the Z boson mass at low scales is the Next-to-Minimal Supersymmetric Standard Model (NMSSM). However, in order that fine tuning be absent, the lightest CP-even Higgs boson h should have mass similar to 100 GeV and SM couplings to gauge bosons and fermions. The only way that this can be consistent with LEP limits is if h decays primarily via h --> aa --> tau(+)tau(-)tau(+)tau(-) or 4j but not 4b, where a is the lighter of the two pseudo-scalar Higgses that are present in the NMSSM. Interestingly, m(a) 2m(tau) somewhat preferred. Thus, h --> tau(+)tau(-)tau(+)tau(-) becomes a key mode of interest. Meanwhile, all other Higgs bosons of the NMSSM are typically quite heavy. Detection of any of the NMSSM Higgs bosons at the LHC in this preferred scenario will be very challenging using conventional channels. In this paper, we demonstrate that the h --> aa --> tau(+)tau(-)tau(+)tau(-) decay chain should be visible if the Higgs is produced in the process pp --> p + h + p with the final state protons being measured using suitably installed forward detectors. Moreover, we show that the mass of both the h and the a can be determined on an event-by-event basis.