arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1307.7601hep-phhep-ex
收藏

根据LHC结果计算轻NMSSM赝标在中性伴子衰变中的碰撞特征

Collider signatures of a light NMSSM pseudoscalar in neutralino decays in the light of LHC results

David G. Cerdeno, Pradipta Ghosh, Chan Beom Park, Miguel Peiro

摘要:

我们研究了次最小超对称标准模型(NMSSM)中由非常轻的赝标希格斯粒子在中性伴子衰变中引起的特征,并确定了它们在LHC上的可观测性。我们专注于两个轻标量希格斯玻色子(其中一个是125 GeV的SM类和一个更轻的单态类)和一个质量范围为2m_tau < m_a1 < 2m_b的非常轻(单态类)的赝标量希格斯粒子的场景。我们考虑中性子-电荷子对的产生和随后的衰变X_{2,3} -> X_1 a1,这导致涉及多轻子和丢失的横向能量的拓扑结构。我们确定了一组选择切割,可以有效地将信号从标准模型或最小超对称标准模型的背景中分离出来。我们还将该过程与一组基准点,我们计算预期的事件数和信号强度与8 TeV的质心能量的LHC。我们表明,这个信号已经可以探测NMSSM参数空间中的某些点。

英文摘要:

We investigate signatures induced by a very light pseudoscalar Higgs in neutralino decays in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and determine their observability at the LHC. We concentrate on scenarios which feature two light scalar Higgs bosons (one of them is SM-like with a mass of 125 GeV and a singlet-like lighter one) with a very light (singlet-like) pseudoscalar Higgs in the mass range 2m_tau < m_a1 < 2m_b. We consider neutralino-chargino pair production and the subsequent decay X_{2,3}-> X_1 a1, which leads to topologies involving multi-leptons and missing transverse energy. We determine a set of selection cuts that can effectively isolate the signal from backgrounds of the Standard Model or the Minimal Supersymmetric Standard Model. We also exemplify the procedure with a set of benchmark points, for which we compute the expected number of events and signal strength for LHC with 8 TeV center of mass energy. We show that this signal can already be probed for some points in the NMSSM parameter space.

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。

↑