{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.85728.v1","@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":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2018","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.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t1","@type":"Dataset","description":"Distribution of the reconstructed diphoton mass for data events passing the analysis selection, in the low-$\\Delta E$ category. There are...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t2","@type":"Dataset","description":"Distribution of the reconstructed diphoton mass for data events passing the analysis selection, in the high-$\\Delta E$ category. There are...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t3","@type":"Dataset","description":"The observed upper limits on the production cross-section times the product of branching ratios for the benchmark signal scenario involving...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t4","@type":"Dataset","description":"The expected upper limits on the production cross-section times the product of branching ratios for the benchmark signal scenario involving...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t5","@type":"Dataset","description":"The observed upper limits on the production cross-section times the product of branching ratios for the benchmark signal scenario involving...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t6","@type":"Dataset","description":"The expected upper limits on the production cross-section times the product of branching ratios for the benchmark signal scenario involving...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t7","@type":"Dataset","description":"Observed 95% CL upper limits on the visible cross section as a function of $m_X$ and the fraction of events...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t8","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 0.1 GeV.","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t9","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 0.5 GeV.","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t10","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 0.7 GeV.","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t11","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 1 GeV.","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t12","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 2 GeV.","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t13","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 5 GeV.","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t14","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 2\\gamma$ with $m_a$ = 10 GeV.","name":"Table 14"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t15","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 3\\pi^0\\rightarrow 6\\gamma$ with $m_a$ = 0.5 GeV.","name":"Table 15"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t16","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 3\\pi^0\\rightarrow 6\\gamma$ with $m_a$ = 0.7 GeV.","name":"Table 16"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t17","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 3\\pi^0\\rightarrow 6\\gamma$ with $m_a$ = 1 GeV.","name":"Table 17"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t18","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 3\\pi^0\\rightarrow 6\\gamma$ with $m_a$ = 2 GeV.","name":"Table 18"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t19","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 3\\pi^0\\rightarrow 6\\gamma$ with $m_a$ = 5 GeV.","name":"Table 19"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t20","@type":"Dataset","description":"Selection efficiency for reconstructed photons originating from the decay $a\\rightarrow 3\\pi^0\\rightarrow 6\\gamma$ with $m_a$ = 10 GeV.","name":"Table 20"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t21","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 21"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t22","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 22"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t23","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 23"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t24","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 24"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t25","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 25"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t26","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 26"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t27","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 27"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t28","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 28"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t29","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 29"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t30","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 30"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t31","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 31"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t32","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 32"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t33","@type":"Dataset","description":"Fraction of reconstructed photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for reconstructed photons...","name":"Table 33"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t34","@type":"Dataset","description":"Selection efficiency for photons originating from the BSM process $X\\rightarrow\\gamma\\gamma$, where the $X$ particle is a high-mass narrow-width scalar particle...","name":"Table 34"},{"@id":"https://doi.org/10.17182/hepdata.85728.v1/t35","@type":"Dataset","description":"Fraction of photons with a value of shower shape variable $\\Delta E$ lower than the threshold, for photons originating from...","name":"Table 35"}],"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","name":"Search for pairs of highly collimated photon-jets in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1692387?version=1","version":1}