{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.85728.v1/t4","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1692387"}},{"@id":"https://doi.org/10.1103/PhysRevD.99.012008","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Dataset","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2018","description":"The expected upper limits on the production cross-section times the product of branching ratios for the benchmark signal scenario involving...","distribution":[{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/353346/root","description":"ROOT file","encodingFormat":"https://root.cern"},{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/353346/yaml","description":"YAML file","encodingFormat":"https://yaml.org"},{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/353346/csv","description":"CSV file","encodingFormat":"text/csv"},{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/353346/yoda","description":"YODA file","encodingFormat":"https://yoda.hepforge.org"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1692387?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/85728"}],"inLanguage":"en","includedInDataCatalog":{"@id":"https://doi.org/10.17182/hepdata.85728.v1","@type":"DataCatalog","url":"https://www.hepdata.net/record/ins1692387?version=1"},"isPartOf":{"@id":"https://doi.org/10.17182/hepdata.85728.v1","@type":"Dataset","description":"CERN-LHC.  Search for the pair production of photon-jets---collimated groupings of photons---with the ATLAS detector. Highly collimated photon-jets can arise from the decay of new, highly boosted particles that can decay to multiple photons collimated enought to be identified in the electromagnetic calorimeter as a single, photon-like energy cluster. Data from proton\u2013proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36.7 fb$^{-1}$, were collected in 2015 and 2016. Upper limits are placed on $\\sigma\\times \\mathcal{B}(X\\rightarrow aa)\\times \\mathcal{B}(a\\rightarrow\\gamma\\gamma)^2$ and $\\sigma\\times \\mathcal{B}(X\\rightarrow aa)\\times \\mathcal{B}(a\\rightarrow 3\\pi^0)^2$ for 200 GeV < $m_X$ < 2TeV and $m_a$ < 10 GeV.\n\nTables 8 to 35 are provided to allow the recasting of the cross-section upper limits to different signal models predicting final states with photon-jets. These tables present the selection efficiency (before categorisation) $\\varepsilon_{\\gamma_R}(E_\\mathrm{T},\\eta)$ for reconstructed photons originating from a photon-jet, and the fraction $f_{\\gamma_R}(E_\\mathrm{T},\\eta)$ of reconstructed photons with a value of the shower shape variable $\\Delta E$ lower than the threshold.\n\nThe fiducial region is defined as:\n- $E_\\mathrm{T,1}>0.4\\times m_X$\n- $E_\\mathrm{T,2}>0.3\\times m_X$\n- $|\\eta_i| < 2.37 (i=1,2)$  (excluding $1.37 < |\\eta_i| <1.52$)\nwhere $E_\\mathrm{T,1}, \\eta_1$ ($E_\\mathrm{T,2}, \\eta_2$) are the transverse energy and the pseudorapidity of the $a$ particle with the higher (the lower) transverse energy, respectively.\n\nFor a resonance particle $X$ decaying into a pair of photon-jets via $X\\rightarrow aa$, the total selection efficiency, $\\varepsilon$, and the fraction of events in the low-$\\Delta E$ category, $f$, can be computed by integrating over the p.d.f. of $(E_\\mathrm{T,1},\\eta_1,E_\\mathrm{T,2},\\eta_2)$ with the following procedure:\n- apply the fiducial cuts to the two $a$ particles\n- compute $\\varepsilon$ from the integration of $\\varepsilon_{\\gamma_R}(E_\\mathrm{T,1},\\eta_1) \\cdot \\varepsilon_{\\gamma_R}(E_\\mathrm{T,2},\\eta_2)$ \n- compute $f$ from the integration of $\\varepsilon_{\\gamma_R}(E_\\mathrm{T,1},\\eta_1) \\cdot \\varepsilon_{\\gamma_R}(E_\\mathrm{T,2},\\eta_2) \\cdot f_{\\gamma_R}(E_\\mathrm{T,1},\\eta_1) \\cdot f_{\\gamma_R}(E_\\mathrm{T,2},\\eta_2)$ divided by $\\varepsilon$\n\nWith the resulting value of $f$ for a given value of $m_X$, the 95% CL observed upper limit on the visible cross-section (i.e. $\\sigma\\times \\mathcal{B}\\times\\varepsilon$) can be taken from Table 7, which is considered to be model-independent. The corresponding upper limit on the cross-section times branching ratios, $\\sigma \\times \\mathcal{B}$, can be computed by dividing the obtained visible cross-section by $\\varepsilon$.\n\nThe estimation procedure described above is validated by comparing the results for the benchmark signal scenario decaying via $X\\rightarrow aa\\rightarrow 4\\gamma$ with the results presented in the paper (i.e. Table 3). It is found that the two results agree within 20%, and the result with the estimation procedure described above gives lower values. The main difference is found for large values of the mass ratio, $0.005<m_a/m_X$. This is because, for larger values of $m_a/m_X$, the width of the distribution of the reconstructed diphoton mass $m_{\\gamma_{R}\\gamma_{R}}$ increases. This is caused by the wider angular separation between the photons inside a photon-jet for larger $m_a/m_X$, leading to a greater part of the energy of the shower leaking out of the window defined in the cells of the electromagnetic calorimeter to collect energy for the photon reconstruction.","name":"Search for pairs of highly collimated photon-jets in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with the ATLAS detector","url":"https://www.hepdata.net/record/ins1692387?version=1"},"keywords":"13000, Cross-section, Photon-jet, Expected limit, $pp\\rightarrow X \\rightarrow aa \\rightarrow 4\\gamma$","name":"Table 4","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/86572","version":1}