First Search for Exotic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Boson Decays into Photons and Neutral Pions in Hadron Collisions

Aaltonen, T.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos̆, J.; Apollinari, G.; Appel, J. A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashmanskas, W.; Auerbach, B.; Aurisano, A.; Azfar, F.; Badgett, W.; Bae, T.; Barbaro‐Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barria, P.; Bartoš, P.; Bauce, M.; Bedeschi, F.; Behari, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Beretvas, A.; Bhatti, A.; Bland, K. R.; Blumenfeld, B.; Bocci, A.; Bodek, A.; Bortoletto, D.; Boudreau, J.; Boveia, A.; Brigliadori, L.; Bromberg, C.; Brücken, E.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Bussey, P.; Butti, P.; Buzatu, A.; Calamba, A.; Camarda, S.; Campanelli, M.; Canelli, F.; Carls, B.; Carlsmith, D.; Carosi, R.; Carrillo, S.; Casal, B.; Casarsa, M.; Castro, A.; Catastini, P.; Cauz, D.; Cavaliere, V.; Cavalli‐Sforza, M.; Cerri, A.; Cerrito, L.; Chen, Y. C.; Chertok, M.; Chiarelli, G.; Chlachidze, G.; Cho, K.; Chokheli, D.; Clark, A.; Clarke, C.; Convery, M. 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doi:10.1103/physrevlett.112.111803

Cited by 25 publications

(25 citation statements)

References 50 publications

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“…[21], but ref. [28] points out that for m a m π 0 even stronger constraints can be derived from the CDF result BR(Z → γγ) < 1.45 × 10 −5 [63]. 7 Note that this expression at face value implies a divergent total cross section.…”

Section: Bounds From Electron-positron Collidersmentioning

confidence: 98%

Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

Dolan

Ferber

Hearty

et al. 2017

J. High Energ. Phys.

260

380

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Light pseudoscalars interacting pre-dominantly with Standard Model gauge bosons (so-called axion-like particles or ALPs) occur frequently in extensions of the Standard Model. In this work we review and update existing constraints on ALPs in the keV to GeV mass region from colliders, beam dump experiments and astrophysics. We furthermore provide a detailed calculation of the expected sensitivity of Belle II, which can search for visibly and invisibly decaying ALPs, as well as long-lived ALPs. The Belle II sensitivity is found to be substantially better than previously estimated, covering wide ranges of relevant parameter space. In particular, Belle II can explore an interesting class of dark matter models, in which ALPs mediate the interactions between the Standard Model and dark matter. In these models, the relic abundance can be set via resonant freeze-out, leading to a highly predictive scenario consistent with all existing constraints but testable with single-photon searches at Belle II in the near future.

show abstract

Section: Bounds From Electron-positron Collidersmentioning

confidence: 98%

Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

Dolan

Ferber

Hearty

et al. 2017

J. High Energ. Phys.

260

380

View full text Add to dashboard Cite

show abstract

“…There is a SM decay Z → π 0 γ with expected branching ratio from 10 −12 to 10 −9 [25][26][27][28][29][30][31][32][33][34]. The decay of this type was searched before [35], but not at the LHC.…”

Section: Decays Of the Heavy Scalarmentioning

confidence: 99%

“…The measurement of the Z boson decay into 2 photons was performed by the CDF collaboration [35] providing an upper bound BR(Z → γγ) ≤ 1.5 · 10 −5 .…”

Section: Decays Of the Heavy Scalarmentioning

confidence: 99%

Connection between diphoton and triboson channels in new physics searches

et al. 2018

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Diphoton channel provides a clean signature in searches for new physics. In this paper, we discuss a connection between the diphoton channel (γγ) and triboson channels (Zγγ, ZZγ, W W γ) imposed by the SU (2) L × U (1) Y symmetry of the Standard Model (SM) in certain classes of models. To illustrate this idea we choose a simple model that has all these channels. In this model, the same physics can give rise to γ+MET instead of γγ and 2 bosons plus missing energy instead of 3-boson channels. We analyze existing constraints and previous searches and show that channels W W γ and especially Zγ+MET have a potential to discover new physics at the LHC.

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“…In this section, we turn to the final important constraint: the upper limit from the CDF Collaboration [25] on the Z boson decay to two photons, and from the ATLAS Collaboration [24] on the Z boson decay to three photons. The limits at 95% of confidence level (CL) are as follows:…”

Section: Constraints From Photonic Decays Of the Z Bosonmentioning

confidence: 99%

“…Just as one expects an excess in S → Zγ and S → ZZ in the near future simply on the basis of writing down a gauge invariant theory of S that couples to photons, one also expects couplings of a to Z in models where a decays to photons. This opens up Z → γγγ (constrained by ATLAS [24]) and, in the limit that m a is small and the two photons from a → γγ are reconstructed as a single photon, Z → γγ decays (constrained by CDF [25]). These constraints are depicted in figure 3.…”

Section: Introductionmentioning

confidence: 99%

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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First Search for ExoticZBoson Decays into Photons and Neutral Pions in Hadron Collisions

Cited by 25 publications

References 50 publications

Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

Revised constraints and Belle II sensitivity for visible and invisible axion-like particles

Connection between diphoton and triboson channels in new physics searches

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

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