Gonçalves Dorival, Han Tao, Mukhopadhyay Satyanarayan
PITT PACC, Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, Pennsylvania 15260, USA.
Phys Rev Lett. 2018 Mar 16;120(11):111801. doi: 10.1103/PhysRevLett.120.111801.
Examining the Higgs sector at high energy scales through off-shell Higgs production can potentially shed light on the naturalness problem of the Higgs boson mass. We propose such a study at the LHC by utilizing a representative model with a new scalar field (S) coupled to the standard model Higgs doublet (H) in a form |S|^{2}|H|^{2}. In the process pp→h^{*}→ZZ, the dominant momentum-dependent part of the one-loop scalar singlet corrections, especially above the new threshold at 2m_{S}, leads to a measurable deviation in the differential distribution of the Z-pair invariant mass, in accordance with the quadratic divergence cancellation to the Higgs mass. We find that it is conceivable to probe such new physics at the 5σ level at the high-luminosity LHC, improving further with the upgraded 27 TeV LHC, without requiring the precise measurement of the Higgs boson total width. The discovery of such a Higgs portal could also have important implications for thermal dark matter as well as for electroweak baryogenesis.
通过脱壳希格斯粒子产生过程在高能标度下研究希格斯区，可能会为希格斯玻色子质量的自然性问题提供线索。我们提议在大型强子对撞机（LHC）上进行这样一项研究，利用一个具有新标量场（S）的代表性模型，该新标量场以|S|²|H|²的形式与标准模型希格斯二重态（H）耦合。在pp→h*→ZZ过程中，单圈标量单态修正的主要动量依赖部分，特别是在2m_S的新阈值之上，会导致Z对不变质量的微分分布出现可测量的偏差，这与希格斯质量的二次发散抵消相一致。我们发现，在高亮度LHC上以5σ水平探测这种新物理是可行的，升级到27 TeV的LHC后会进一步改善，而且不需要精确测量希格斯玻色子的总宽度。发现这样一个希格斯门户对热暗物质以及电弱重子生成也可能有重要意义。
