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The 750 GeV excess from photon-photon and quark-quark processes
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics. (Theoretical high energy physics)ORCID iD: 0000-0001-7268-549X
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics. (Theoretical high energy physics)ORCID iD: 0000-0003-0452-0671
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics. (Theoretical high energy physics)
2016 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The observed excess in the diphoton mass spectrum around 750 GeV at the 13 TeV LHC possibly indicates the presence of a photonphilic resonance. We show that the excess can be explained by a scalar of the type involved in Bekenstein's framework for varying electromagnetic coupling theories. The scalar, in our model, couples dominantly to photons and is mainly produced by the quark-quark fusion at the LHC. In addition, it can also be produced in photon-photon fusion. Our model has only two free parameters, the mass of the scalar and the scale of the new physics, which are fixed by the LHC excess to 750 GeV and 1.5 - 2 TeV, respectively. The scalar has a large three-body decay to a fermion pair and a photon, which provides an interesting search channel with a dilepton-photon resonance around 750 GeV.

Place, publisher, year, edition, pages
2016.
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics; Theoretical Physics
Identifiers
URN: urn:nbn:se:uu:diva-392453OAI: oai:DiVA.org:uu-392453DiVA, id: diva2:1348527
Conference
51st Rencontres de Moriond on QCD and High Energy Interactions, 19-26 Mar 2016, La Thuile, Italy
Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-10-11Bibliographically approved

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arXiv:1605.05627

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Mandal, TanumoyDanielsson, UlfEnberg, RikardIngelman, Gunnar
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