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Search for new phenomena in events with at least three photons collected in pp collisions at √s = 8 TeV with the ATLAS detector

Aad, G ; Abbott, B. ; Abdallah, J. ; Abdinov, O ; Aben, R ; Abolins, M ; Åkesson, Torsten LU orcid ; Bocchetta, Simona LU ; Bryngemark, Lene LU and Doglioni, Caterina LU , et al. (2016) In European Physical Journal C 76(4).
Abstract
Results of a search for new phenomena in events with at least three photons are reported. Data from proton– proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1, were collected with the ATLAS detector at the LHC. The observed data are well described by the Standard Model. Limits at the 95 % confidence level on new phenomena are presented based on the rate of events in an inclusive signal region and a restricted signal region targeting the rare decay Z → 3γ, as well as di-photon and tri-photon resonance searches. For a Standard Model Higgs boson decaying to four photons via a pair of intermediate pseudoscalar particles (a), limits are found to be σ ×BR(h → aa)×BR(a → γ γ)2< 10−3σSM... (More)
Results of a search for new phenomena in events with at least three photons are reported. Data from proton– proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1, were collected with the ATLAS detector at the LHC. The observed data are well described by the Standard Model. Limits at the 95 % confidence level on new phenomena are presented based on the rate of events in an inclusive signal region and a restricted signal region targeting the rare decay Z → 3γ, as well as di-photon and tri-photon resonance searches. For a Standard Model Higgs boson decaying to four photons via a pair of intermediate pseudoscalar particles (a), limits are found to be σ ×BR(h → aa)×BR(a → γ γ)2< 10−3σSM for 10 GeV < ma < 62 GeV. Limits are also presented for Higgs boson-like scalars (H) for mH > 125 GeV, and for a Z' decaying to three photons via Z' → a + γ → 3γ. Additionally, the observed limit on the branching ratio of the Z boson decay to three photons is found to be BR(Z → 3γ) < 2.2 × 10−6, a result five times stronger than the previous result from LEP. © CERN for the benefit of the ATLAS collaboration 2016. (Less)
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type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
76
issue
4
publisher
Springer
external identifiers
  • scopus:84963894097
ISSN
1434-6044
DOI
10.1140/epjc/s10052-016-4034-8
language
English
LU publication?
yes
additional info
Cited By :17 Export Date: 23 May 2018
id
6f6b1d54-1f8c-4c7f-92a7-434d005901d4
date added to LUP
2018-05-24 11:07:09
date last changed
2023-04-08 12:35:28
@article{6f6b1d54-1f8c-4c7f-92a7-434d005901d4,
  abstract     = {{Results of a search for new phenomena in events with at least three photons are reported. Data from proton– proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1, were collected with the ATLAS detector at the LHC. The observed data are well described by the Standard Model. Limits at the 95 % confidence level on new phenomena are presented based on the rate of events in an inclusive signal region and a restricted signal region targeting the rare decay Z → 3γ, as well as di-photon and tri-photon resonance searches. For a Standard Model Higgs boson decaying to four photons via a pair of intermediate pseudoscalar particles (a), limits are found to be σ ×BR(h → aa)×BR(a → γ γ)2&lt; 10−3σSM for 10 GeV &lt; ma &lt; 62 GeV. Limits are also presented for Higgs boson-like scalars (H) for mH &gt; 125 GeV, and for a Z' decaying to three photons via Z' → a + γ → 3γ. Additionally, the observed limit on the branching ratio of the Z boson decay to three photons is found to be BR(Z → 3γ) &lt; 2.2 × 10−6, a result five times stronger than the previous result from LEP. © CERN for the benefit of the ATLAS collaboration 2016.}},
  author       = {{Aad, G and Abbott, B. and Abdallah, J. and Abdinov, O and Aben, R and Abolins, M and Åkesson, Torsten and Bocchetta, Simona and Bryngemark, Lene and Doglioni, Caterina and Floderus, Anders and Hawkins, Anthony and Hedberg, Vincent and Ivarsson, Jenny and Jarlskog, Göran and Lytken, Else and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Search for new phenomena in events with at least three photons collected in pp collisions at √s = 8 TeV with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-016-4034-8}},
  doi          = {{10.1140/epjc/s10052-016-4034-8}},
  volume       = {{76}},
  year         = {{2016}},
}