TY - JOUR
T1 - Exploring high-mass diphoton resonance without new colored states
AU - Ahriche, Amine
AU - Faisel, Gaber
AU - Nasri, Salah
AU - Tandean, Jusak
N1 - Funding Information:
A.A. is supported by the Algerian Ministry of Higher Education and Scientific Research under the CNEPRU Project No. B00L02UN180120140040. He would like to thank Xiao-Gang He and J.T. for the warm hospitality at NTU-CTS, where this work was initiated. The work of G.F. was supported in part by the research grant NTU-ERP-102R7701. The work of J.T. was supported in part by the Ministry of Education, Ethiopia (MOE) Academic Excellence Program (Grant No. 102R891505). We gratefully acknowledge partial support from the National Center for Theoretical Sciences of Taiwan.
Publisher Copyright:
© 2017 The Author(s)
PY - 2017/3/1
Y1 - 2017/3/1
N2 - A new heavy resonance may be observable at the LHC if it has a significant decay branching fraction into a pair of photons. We entertain this possibility by looking at the modest excess in the diphoton invariant mass spectrum around 750 GeV recently reported in the ATLAS and CMS experiments. Assuming that it is a spinless boson, dubbed s˜, we consider it within a model containing two weak scalar doublets having zero vacuum expectation values and a scalar singlet in addition to the doublet responsible for breaking the electroweak symmetry. The model also possesses three Dirac neutral singlet fermions, the lightest one of which can play the role of dark matter and which participate with the new doublet scalars in generating light neutrino masses radiatively. We show that the model is consistent with all phenomenological constraints and can yield a production cross section σ(pp→s˜→γγ) of roughly the desired size, mainly via the photon-fusion contribution, without involving extra colored fermions or bosons. We also discuss other major decay modes of s˜ which are potentially testable in upcoming LHC measurements.
AB - A new heavy resonance may be observable at the LHC if it has a significant decay branching fraction into a pair of photons. We entertain this possibility by looking at the modest excess in the diphoton invariant mass spectrum around 750 GeV recently reported in the ATLAS and CMS experiments. Assuming that it is a spinless boson, dubbed s˜, we consider it within a model containing two weak scalar doublets having zero vacuum expectation values and a scalar singlet in addition to the doublet responsible for breaking the electroweak symmetry. The model also possesses three Dirac neutral singlet fermions, the lightest one of which can play the role of dark matter and which participate with the new doublet scalars in generating light neutrino masses radiatively. We show that the model is consistent with all phenomenological constraints and can yield a production cross section σ(pp→s˜→γγ) of roughly the desired size, mainly via the photon-fusion contribution, without involving extra colored fermions or bosons. We also discuss other major decay modes of s˜ which are potentially testable in upcoming LHC measurements.
UR - http://www.scopus.com/inward/record.url?scp=85009164407&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85009164407&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysb.2016.12.026
DO - 10.1016/j.nuclphysb.2016.12.026
M3 - Article
AN - SCOPUS:85009164407
SN - 0550-3213
VL - 916
SP - 64
EP - 93
JO - Nuclear Physics B
JF - Nuclear Physics B
ER -