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1. chinaXiv:201606.00308 [pdf]

Hidden confining world on the 750 GeV diphoton excess

Bian, Ligong; Chen, Ning; Liu, Da; Shu, Jing
Subjects: Physics >> The Physics of Elementary Particles and Fields

We explain the recent diphoton excesses around 750 GeV by both ATLAS and CMS as a singlet scalar Phi which couples to SM gluon and neutral gauge bosons only through higher-dimensional operators. A natural explanation is that Phi is a pseudo-Nambu-Goldstone boson (pNGB) which receives parity violation through anomaly if there exists a hidden strong dynamics. The singlet and other light pNGBs will decay into two SM gauge bosons and even serves as the metastable colored states which can be probed in the future. By accurately measuring their relative decay and the total production rate in the future, we will learn the underlying strong dynamics parameter. The lightest baryon in this confining theory could serve as a viable dark matter candidate.

submitted time 2016-06-24 Hits2091Downloads332 Comment 0

2. chinaXiv:201606.00217 [pdf]

Impact of a complex singlet: Electroweak baryogenesis and dark matter

Jiang, Minyuan; Bian, Ligong; Huang, Weicong; Shu, Jing
Subjects: Physics >> The Physics of Elementary Particles and Fields

With the assistance of a complex singlet, and an effective operator involving CP violations, the dark matter relic abundance and baryon asymmetry of the universe have been addressed simultaneously. We studied the electroweak baryogenesis mechanism systematically. The electroweak phase transition analysis indicates that the strong first order phase transition takes place by one-step or two-step type due to the dynamics of the energy gap between the electroweak vacuum and the vacuum of the complex singlet. The relation between the magnitude of baryon asymmetry of the universe and the phase transition type and strength has been explored in the framework of electroweak baryogenesis.

submitted time 2016-06-18 Hits2174Downloads360 Comment 0

3. chinaXiv:201605.01129 [pdf]

Collider signatures of Higgs-portal scalar dark matter

Han, Huayong; Yang, Jin Min; Zhang, Yang; Zheng, Sibo
Subjects: Physics >> The Physics of Elementary Particles and Fields

In the simplest Higgs-portal scalar dark matter model, the dark matter mass has been restricted to be either near the resonant mass (m(h)/2) or in a large-mass region by the direct detection at LHC Run 1 and LUX. While the large-mass region below roughly 3 TeV can be probed by the future Xenon1T experiment, most of the resonant mass region is beyond the scope of Xenon1T. In this paper, we study the direct detection of such scalar dark matter in the narrow resonant mass region at the 14 TeV LHC and the future 100 TeV hadron collider. We show the luminosities required for the 2 sigma exclusion and 5 sigma discovery. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

submitted time 2016-05-09 Hits492Downloads276 Comment 0

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