Electroweak vacuum stability and diphoton excess at 750 GeV

doi:10.1088/1674-1137/40/8/081001

	Electroweak vacuum stability and diphoton excess at 750 GeV
	Zhang J(张珏); Zhou S(周顺); Zhang, J; Zhou, S
刊名	CHINESE PHYSICS C
	2016
卷号	40 期号:8
关键词	vacuum stability diphoton excess singlet scalar
DOI	10.1088/1674-1137/40/8/081001
通讯作者	张珏 ; 周顺
文献子类	Article
英文摘要	Recently, both ATLAS and CMS collaborations at the CERN Large Hadron Collider (LHC) announced their observations of an excess of diphoton events around the invariant mass of 750 GeV with a local significance of 3.6 sigma and 2.6 sigma, respectively. In this paper, we interpret the diphoton excess as the on-shell production of a real singlet scalar in the pp -> S -> gamma gamma channel. To accommodate the observed production rate, we further introduce a vector-like fermion F, which carries both color and electric charges. The viable regions of model parameters are explored for this simple extension of the Standard Model (SM). Moreover, we revisit the problem of electroweak vacuum stability in the same scenario, and find that the requirement for the electroweak vacuum stability up to high energy scales imposes serious constraints on the Yukawa coupling of the vector-like fermion and the quartic couplings of the SM Higgs boson and the new singlet scalar. Consequently, a successful explanation for the diphoton excess and the absolute stability of electroweak vacuum cannot be achieved simultaneously in this economical setup.
WOS关键词	RENORMALIZATION-GROUP EQUATIONS ; QUANTUM-FIELD THEORY ; HIGGS-BOSON MASSES ; STANDARD-MODEL ; BROKEN SYMMETRIES ; ATLAS DETECTOR ; ROOT-S=7 TEV ; TOP-QUARK ; LHC ; SUPERSYMMETRY
语种	英语
WOS记录号	WOS:000381731100001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/260678]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhang J,Zhou S,Zhang, J,et al. Electroweak vacuum stability and diphoton excess at 750 GeV[J]. CHINESE PHYSICS C,2016,40(8).
APA	张珏,周顺,Zhang, J,&Zhou, S.(2016).Electroweak vacuum stability and diphoton excess at 750 GeV.CHINESE PHYSICS C,40(8).
MLA	张珏,et al."Electroweak vacuum stability and diphoton excess at 750 GeV".CHINESE PHYSICS C 40.8(2016).