Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8186844 | Physics Letters B | 2018 | 5 Pages |
Abstract
The Higgs-top coupling plays a central role in the hierarchy problem and the vacuum stability of the Standard Model (SM). We propose a central-edge asymmetry (ACE) to probe the CP violating Higgs-top coupling in dileptonic channel of tt¯h(âbb¯) production at the LHC. We demonstrate that the CP-violating Higgs-top coupling can affect the central-edge asymmetry through distorting Îyâ+ââ distribution because of the contribution of new top charge asymmetric term. Since Îyâ+ââ distribution is frame-independent and has a good discrimination even in boosted regime, we use the jet substructure technique to enhance the observability of the dileptonic channel of tt¯h production. We find that (1) the significance of dileptonic channel of tt¯h production can reach 5Ï for CP phase ξ=0,Ï/4,Ï/2 when the luminosity L=795,993,1276fbâ1 at 14 TeV LHC. (2) the central-edge asymmetry ACE show a good discrimination power of CP phase of tt¯h interaction, which are â40.26%, â26.60%, â9.47% for ξ=0, Ï/4, Ï/2 respectively and are hardly affected by the event selections. Besides, by performing the binned-Ï2 analysis of Îyâ+ââ distribution, we find that the scalar and pseudo-scalar interactions can be distinguished at 95% C.L. level at 14 TeV HL-LHC.
Related Topics
Physical Sciences and Engineering
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Authors
Jinmian Li, Zong-guo Si, Lei Wu, Jason Yue,