Phenomenology of photon-jets

Ellis, Stephen; Roy, T.; Scholtz, Jakub

doi:10.1103/physrevd.87.014015

Cited by 56 publications

(89 citation statements)

References 52 publications

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“…The possibility for such photon-jets has previously been considered in detail, and in particular as an exotic decay mode of the standard model Higgs [51][52][53][54][55][56][57]. The obvious class of models producing this topology are Hidden Valleys [6,7], in which Φ decays at tree level into a pair of light scalars, φ, which in turn decays to a pair of photons.…”

Section: Collimated Pairs Of Photons? Hidden Valley Modelsmentioning

confidence: 99%

Rays of light from the LHC

et al. 2016

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We consider models for the di-photon resonance observed at ATLAS (with 3.6 fb −1 ) and CMS (with 2.6 fb −1 ). We find there is no conflict between the signal reported at 13 TeV, and the constraints from both experiments at 8 TeV with 20.3 fb −1 . We make a simple argument for why the decay to γγ mode must be generated by additional, beyond the standard model (SM) states. We explore four viable options: (i): resonance production and decay through loops of messenger fermions or scalars; (ii): a resonant messenger which decays to the di-photon resonance + X; (iii): an edge configuration where A → Bγ → Cγγ, and (iv): Hidden Valley-like models where the resonance decays to a pair of very light (sub-GeV) states, each of which in turn decays to a pair of collimated photons that cannot be distinguished from a single photon. Since in each case multiple new states have been introduced, a wealth of signatures is expected to ensue at Run-2 of LHC.

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Section: Collimated Pairs Of Photons? Hidden Valley Modelsmentioning

confidence: 99%

Rays of light from the LHC

et al. 2016

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“…This problem is ameliorated if one instead considers the following process that could mimic a diphoton signal: gg → s → aa → 4γ, where the field a is a very light scalar so that two photons from its decays are highly collimated and can be misidentified as a single photon. 1 In this construction the interaction between s and a can occur at tree, rather 1 The possibility that a pair of photons from a highly boosted particle could be identified as a single photon has previously been studied in [189][190][191][192][193][194][195], and considered in the context of the 750 GeV signal [196][197][198][199][200].…”

Section: Introductionmentioning

confidence: 99%

Diphotons from diaxions

Aparicio¹,

Azatov²,

Hardy³

et al. 2016

J. High Energ. Phys.

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We study models in which the 750 GeV diphoton excess is due to a scalar decaying to two pseudo-Nambu-Goldstone bosons that subsequently decay into two pairs of highly boosted photons, misidentified as individual photons. Performing a model independent analysis we find that, with axion mass around 200 MeV, this class of theories can naturally explain the observed signal with a large width, without violating monojet constraints. At the same time the requirement of a prompt axion decay can be satisfied only with a relatively large axion-photon coupling, leading to many new charged particles at the TeV scale. However, the required multiplicities of such fields is still moderately reduced relative to models with direct diphoton production.

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“…Identifying photon-jets at hadron colliders has been an interesting line of investigation in recent years [48][49][50][51]. In particular, concerning the diphoton excess of 750 GeV photons Figure 10.…”

Section: Discovery Estimate From An Improved Analysis For Detecting Pmentioning

confidence: 99%

“…[50,51]. In these works, samples of Higgs bosons of 120 GeV were assumed to decay to light scalars which, by their turn, decay to collimated photons.…”

Section: Discovery Estimate From An Improved Analysis For Detecting Pmentioning

confidence: 99%

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

Alves

Dias

Sinha

2016

J. High Energ. Phys.

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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 → γγ signal persists while S → Zγ, ZZ and W W remain subdued in the near future. We point out that these Hidden Valley like models invoking S → aa → 4γ must also contend with Z → a(→ γγ)γ 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 → γγ and a → γγ. Results for the particular case where S and a belong to the same complex field are also presented. A γγ resonance at the Z-pole coming from Z → aγ 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.

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Phenomenology of photon-jets

Cited by 56 publications

References 52 publications

Rays of light from the LHC

Rays of light from the LHC

Diphotons from diaxions

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

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