Diphotons from electroweak triplet-singlet mixing

Howe, Kiel; Knapen, Simon; Robinson, Dean J.

doi:10.1103/PhysRevD.94.035021

Title: Diphotons from electroweak triplet-singlet mixing

Journal Article · Tue Aug 23 00:00:00 EDT 2016 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.94.035021 · OSTI ID:1288744

Howe, Kiel ^[1]; Knapen, Simon ^[2]; Robinson, Dean J. ^[2]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Tokyo, Kashiwa (Japan). Kavli Inst. for the Physics and Mathematics of the Universe

The neutral component of a real pseudoscalar electroweak (EW) triplet can produce a diphoton excess at 750 GeV, if it is somewhat mixed with an EW singlet pseudoscalar. This triplet-singlet mixing allows for greater freedom in the diboson branching ratios than the singlet-only case, but it is still possible to probe the parameter space extensively with 300 fb^-1. The charged component of the triplet is pair produced at the LHC, which results in a striking signal in the form of a pair of Wγ resonances with an irreducible rate of 0.27 fb. Other signatures include multiboson final states from cascade decays of the triplet-singlet neutral states. In conclusion, a large class of composite models feature both EW singlet and triplet pseudo-Nambu-Goldstone bosons in their spectrum, with the diboson couplings generated by axial anomalies.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); Ministry of Education, Culture, Sports, Science and Technology (MEXT). World Premier International Research Center Initiative (WPI)

Grant/Contract Number:: AC02-07CH11359; AC02-05CH11231

OSTI ID:: 1288744

Report Number(s):: FERMILAB-PUB--16-089-T; arXiv:1603.08932; 1436501

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 3 Vol. 94; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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