Diphotons at the Z-pole in models of the 750 GeV resonance decaying to axion-like particles

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dc.contributor.author Alves, Alexandre [UNIFESP]
dc.contributor.author Dias, Alex G.
dc.contributor.author Sinha, Kuver
dc.date.accessioned 2019-07-22T15:46:54Z
dc.date.available 2019-07-22T15:46:54Z
dc.date.issued 2016
dc.identifier http://dx.doi.org/10.1007/JHEP08(2016)060
dc.identifier.citation Journal Of High Energy Physics. New York, v. , n. 8, p. -, 2016.
dc.identifier.issn 1029-8479
dc.identifier.uri http://repositorio.unifesp.br/handle/11600/51172
dc.description.abstract Models in which the 750 GeV resonance (S) decays to two light axion-like particles (ALPs a), which in turn decay to collimated photons mimicking the observed signal, are motivated by Hidden Valley scenarios and could also provide a mechanism by which a S -> gamma gamma signal persists while S -> Z gamma, ZZ and WW remain subdued in the near future. We point out that these Hidden Valley like models invoking S -> aa -> 4 gamma must also contend with Z -> a(-> gamma gamma)gamma constraints coming from CDF and ATLAS. Within an effective field theory framework, we work out the constraints on the couplings of S to a and gauge bosons coming from photonic Z decays and ensuring that the ALPs decay inside the electromagnetic calorimeter, in two regimes - where a decays primarily to photons, and where a also has hadronic branchings. The analysis is done for both when S has a large as well as a narrow width, and for different relative contributions to the signal coming from S -> gamma gamma and a -> gamma gamma. Results for the particular case where S and a belong to the same complex field are also presented. A gamma gamma resonance at the Z-pole coming from Z -> a gamma is expected in this class of models. Taking benchmark ALP masses below around 0.4 GeV and, assuming reasonable values for the fake jet rate and the identification efficiency of the photon-jet, we find the prospects for the discovery of diphotons at the Z-pole. en
dc.description.sponsorship Brazilian agency CNPq [303094/2013-3, 307098/2014-1]
dc.description.sponsorship Brazilian agency FAPESP [2013/22079-8]
dc.format.extent -
dc.language.iso eng
dc.publisher Springer
dc.rights Acesso restrito
dc.subject Beyond Standard Model en
dc.subject Effective field theories en
dc.subject Extended Supersymmetry en
dc.title Diphotons at the Z-pole in models of the 750 GeV resonance decaying to axion-like particles en
dc.type Artigo
dc.description.affiliation Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil
dc.description.affiliation Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Santo Andre, SP, Brazil
dc.description.affiliation Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
dc.description.affiliationUnifesp Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil
dc.description.sponsorshipID CNPq:303094/2013-3
dc.description.sponsorshipID 307098/2014-1
dc.description.sponsorshipID FAPESP:2013/22079-8
dc.identifier.doi 10.1007/JHEP08(2016)060
dc.description.source Web of Science
dc.identifier.wos WOS:000381585800002



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