Update on 750 GeV diphotons from closed string states

Anchordoqui, Luis A.; Antoniadis, Ignatios; Goldberg, Haim; Huang, Xing; Lüst, Dieter; Taylor, Tomasz R. (2016). Update on 750 GeV diphotons from closed string states. Physics letters. B, 759, pp. 223-228. Elsevier 10.1016/j.physletb.2016.05.063

[img]
Preview
Text
1-s2.0-S0370269316302106-main.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (2MB) | Preview

Motivated by the recent update on LHC searches for narrow and broad resonances decaying into diphotons we reconsider the possibility that the observed peak in the invariant mass spectrum at Mγ γ = 750 GeV originates from a closed string (possibly axionic) excitation φ (associated with low mass scale string theory) that has a coupling with gauge kinetic terms. We reevaluate the production of φ by photon fusion to accommodate recent developments on additional contributions to relativistic light– light scattering. We also study the production of φ via gluon fusion. We show that for both a narrow and a broad resonance these two initial topologies can accommodate the excess of events, spanning a wide range of string mass scales 7 Ms/TeV 30 that are consistent with the experimental lower bound: Ms > 7 TeV, at 95% CL. We demonstrate that for the two production processes the LHC13 data is compatible with the lack of a diphoton excess in LHC8 data within ∼1σ. We also show that if the resonance production is dominated by gluon fusion the null results on dijet searches at LHC8 further constrain the coupling strengths of φ, but without altering the range of possible string mass scales.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Antoniadis, Ignatios

Subjects:

500 Science > 530 Physics

ISSN:

0370-2693

Publisher:

Elsevier

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

07 Sep 2016 10:50

Last Modified:

07 Sep 2016 10:50

Publisher DOI:

10.1016/j.physletb.2016.05.063

ArXiv ID:

1603.08294

BORIS DOI:

10.7892/boris.86330

URI:

https://boris.unibe.ch/id/eprint/86330

Actions (login required)

Edit item Edit item
Provide Feedback