Interpreting the 750 GeV diphoton excess within topflavor seesaw model
We propose that the extension of the Standard Model by typical vector-like SU(2)L doublet fermions and non-singlet scalar field can account for the observed 750 GeV diphoton excess in experimentally allowed parameter space. Such an idea can be realized in a typical topflavor seesaw model where the n...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2016-10-01
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| Series: | Nuclear Physics B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0550321316302486 |
| _version_ | 1818897803627200512 |
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| author | Junjie Cao Liangliang Shang Wei Su Fei Wang Yang Zhang |
| author_facet | Junjie Cao Liangliang Shang Wei Su Fei Wang Yang Zhang |
| author_sort | Junjie Cao |
| collection | DOAJ |
| description | We propose that the extension of the Standard Model by typical vector-like SU(2)L doublet fermions and non-singlet scalar field can account for the observed 750 GeV diphoton excess in experimentally allowed parameter space. Such an idea can be realized in a typical topflavor seesaw model where the new resonance X is identified as a CP-even or CP-odd scalar emerging from a certain bi-doublet Higgs field, and it can couple rather strongly to photons and gluons through mediators such as vector-like fermions, scalars as well as gauge bosons predicted by the model. Numerical analysis indicates that the model can predict the central value of the diphoton excess without contradicting any constraints from 8 TeV LHC. Among all the constraints, the tightest one comes from the Zγ channel with σ8 TeVZγ≲3.6 fb, which requires σ13 TeVγγ≲6 fb in most of the favored parameter space. Theoretical issues such as vacuum stability and Landau pole are also addressed. |
| first_indexed | 2024-12-19T19:21:59Z |
| format | Article |
| id | doaj.art-8bfc355244be4045b45c8f0651592a90 |
| institution | Directory Open Access Journal |
| issn | 0550-3213 1873-1562 |
| language | English |
| last_indexed | 2024-12-19T19:21:59Z |
| publishDate | 2016-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Physics B |
| spelling | doaj.art-8bfc355244be4045b45c8f0651592a902022-12-21T20:08:59ZengElsevierNuclear Physics B0550-32131873-15622016-10-01911C44747010.1016/j.nuclphysb.2016.08.018Interpreting the 750 GeV diphoton excess within topflavor seesaw modelJunjie Cao0Liangliang Shang1Wei Su2Fei Wang3Yang Zhang4Department of Physics, Henan Normal University, Xinxiang 453007, PR ChinaDepartment of Physics, Henan Normal University, Xinxiang 453007, PR ChinaState Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, PR ChinaDepartment of Physics, Henan Normal University, Xinxiang 453007, PR ChinaState Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, PR ChinaWe propose that the extension of the Standard Model by typical vector-like SU(2)L doublet fermions and non-singlet scalar field can account for the observed 750 GeV diphoton excess in experimentally allowed parameter space. Such an idea can be realized in a typical topflavor seesaw model where the new resonance X is identified as a CP-even or CP-odd scalar emerging from a certain bi-doublet Higgs field, and it can couple rather strongly to photons and gluons through mediators such as vector-like fermions, scalars as well as gauge bosons predicted by the model. Numerical analysis indicates that the model can predict the central value of the diphoton excess without contradicting any constraints from 8 TeV LHC. Among all the constraints, the tightest one comes from the Zγ channel with σ8 TeVZγ≲3.6 fb, which requires σ13 TeVγγ≲6 fb in most of the favored parameter space. Theoretical issues such as vacuum stability and Landau pole are also addressed.http://www.sciencedirect.com/science/article/pii/S0550321316302486 |
| spellingShingle | Junjie Cao Liangliang Shang Wei Su Fei Wang Yang Zhang Interpreting the 750 GeV diphoton excess within topflavor seesaw model Nuclear Physics B |
| title | Interpreting the 750 GeV diphoton excess within topflavor seesaw model |
| title_full | Interpreting the 750 GeV diphoton excess within topflavor seesaw model |
| title_fullStr | Interpreting the 750 GeV diphoton excess within topflavor seesaw model |
| title_full_unstemmed | Interpreting the 750 GeV diphoton excess within topflavor seesaw model |
| title_short | Interpreting the 750 GeV diphoton excess within topflavor seesaw model |
| title_sort | interpreting the 750 gev diphoton excess within topflavor seesaw model |
| url | http://www.sciencedirect.com/science/article/pii/S0550321316302486 |
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