{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.68362.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1346398"}},{"@id":"https://doi.org/10.1007/JHEP07(2015)157","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2016","description":"CERN-LHC.  A search for high-mass resonances decaying into $\\tau^{+}\\tau^{-}$ final states using proton-proton collisions at $\\sqrt{s}= 8$ TeV produced by the Large Hadron Collider is presented. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 19.5-20.3 fb$^{-1}$. No statistically significant excess above the Standard Model expectation is observed; 95% credibility upper limits are set on the cross section times branching fraction of $Z^{\\prime}$ resonances decaying into $\\tau^+\\tau^-$ pairs as a function of the resonance mass. As a result, $Z^{\\prime}$ bosons of the Sequential Standard Model with masses less than 2.02 TeV are excluded at 95% credibility. The impact of the fermionic couplings on the $Z^{\\prime}$ acceptance is investigated and limits are also placed on a $Z^{\\prime}$ model that exhibits enhanced couplings to third-generation fermions\n\nAll events meet the following requirements:\n- At least one reconstructed primary vertex with at least 3 associated tracks having pT > 0.4 GeV.\n- For data, events occurred during periods of stable beam with all relevant detector sub-systems operational.\n\nEvents are triggered by one of the following trigger selections:\n- A trigger requiring the presence of at least one energy deposit in the calorimeter with pT > 125 GeV that has 1-3 associated tracks and passes strict hadronic tau identification criteria based on tracking and calorimetric information (had-had channel).\n- A trigger requiring the presence of at least one energy deposit in the electromagnetic calorimeter either with pT > 24 GeV and tight isolation or with pT > 60 GeV without isolation. The shower profiles are required to be consistent with those expected for electromagnetic showers (lep-had).\n- A trigger requiring the presence of at least one isolated muon with pT > 24 GeV or at least one muon with pT > 36 GeV (lep-had).\n\nThe had-had channel is defined as:\n- No electrons with pT > 15 GeV in the pseudorapidity range [0,1.37] or [1.52,2.47]\n- No muons with pT > 10 GeV in the pseudorapidity range [0,2.5]\n- At least 2 hadronic tau decays with visible pT > 50 GeV \n- The \"leading\" hadronic tau decay has visible pT > 150 GeV\n- Hadronic tau decays are in the pseudorapidity range [0,1.37] or [1.52,2.47]\n- Leading 2 hadronic tau decays pass tau identification\n- Leading 2 hadronic tau decays have opposite electric charge sign\n- Angle between the leading 2 hadronic tau decays in the transverse plane > 2.7 radians\n- Total transverse mass of leading two hadronic tau decays and missing transverse momentum is above a threshold defined for each Z' mass hypothesis\n\nThe lep-had channel is defined as: \n- 1 isolated muon OR 1 isolated electron; pT > 30 GeV \n- Electrons are in the pseudorapidity range [0,1.37] or [1.52,2.47]\n- Electron track and cluster satisfy criteria requiring shower profiles consistent with those expected\n- Electrons are considered isolated if the summed pT of tracks in dR<0.3 is less than 5% of the electron pT and the summed energy in dR<0.2 is less than (5 GeV + 0.7% of the electron pT)\n- Muons are in the pseudorapidity range [0,2.5]\n- Muons are considered isolated if the summed pT of tracks in dR<0.3 is less than 5% of the muon pT\n- No additional electrons with pT > 15 GeV\n- No additional muons with pT > 10 GeV\n- At least 1 hadronic tau decay with visible pT > 30 GeV\n- Hadronic tau decays are in the pseudorapidity range [0,1.37] or [1.52,2.47]\n- Leading hadronic tau decay passes tau identification\n- Isolated lepton and leading hadronic tau decay have opposite electric charge sign\n- Angle between isolated lepton and leading hadronic tau decay in the transverse plane > 2.7 radians\n- Total transverse mass of isolated lepton, leading hadronic tau decay and missing transverse momentum is above a threshold defined for each Z' mass hypothesis\n\nThe transverse mass is defined as:\n\\begin{equation*} \nm_{\\rm T}(p^{A},p^{B})=\\sqrt{2p_{\\rm T}^{A}p_{\\rm T}^{B} \\left ( 1-\\cos\\Delta\\phi(p^{A},p^{B}) \\right )} \\, , \n\\end{equation*}\nwhere $p^{A}$ and $p^{B}$ are two reconstructed physics objects with transverse momenta $p_{\\rm T}^{A}$ and $p_{\\rm T}^{B}$, respectively, which subtend an angle of $\\Delta\\phi(p^{A},p^{B})$ in the transverse plane.\n\nThe total transverse mass is defined as:\n\\begin{equation*}\nm_{\\rm T}^{\\rm tot}(\\tau_1,\\tau_2,E_{\\rm T}^{\\rm miss}) = \\sqrt{m_{\\rm T}^2(\\tau_1,\\tau_2) + m_{\\rm T}^2(\\tau_1,E_{\\rm T}^{\\rm miss}) + m_{\\rm T}^2(\\tau_2,E_{\\rm T}^{\\rm miss})}\\, , \n\\end{equation*}\nwhere $\\tau_1$ and $\\tau_2$ denote the reconstructed visible decay products of the two tau leptons ($e$, $\\mu$ or $\\tau_{\\rm had-vis}$).","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t1","@type":"Dataset","description":"Signal acceptance times efficiency (ACC*EFF) for Z'L, Z'R, Z'narrow and Z'wide divided by ACC*EFF for Z'SSM as a function of...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t2","@type":"Dataset","description":"Ratio of the Z'NU to Z'SSM cross section times tau+tau- branching fraction (SIG*BR) as a function of sin^2phi and the...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t3","@type":"Dataset","description":"Ratio of the Z'NU to Z'SSM acceptance times efficiency (ACC*EFF) in the had-had channel as a function of sin^2phi and...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t4","@type":"Dataset","description":"Ratio of the Z'NU to Z'SSM acceptance times efficiency (ACC*EFF) in the lep-had channel as a function of sin^2phi and...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t5","@type":"Dataset","description":"Z' SSM acceptance (ACC) and product of acceptance and efficiency (ACC*EFF) for the had-had and lep-had selections as a function...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t6","@type":"Dataset","description":"Number of expected Z'SSM signal (NS), background (NB) and observed (N) events passing the total transverse mass ($m_{\\rm T}^{\\rm tot}$)...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t7","@type":"Dataset","description":"Median expected and observed 95% CL upper limits on the cross-section times branching fraction to tau+tau- for Z'SSM production for...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t8","@type":"Dataset","description":"Observed 95% CL upper limits on the cross-section times branching fraction to tau+tau- for Z'L and Z'R production for the...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.68362.v1/t9","@type":"Dataset","description":"Observed 95% CL lower limit on the Z'NU mass as a function of sin^2(phi).","name":"Table 9"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1346398?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/68362"}],"inLanguage":"en","name":"A search for high-mass resonances decaying to $\\tau^{+}\\tau^{-}$ in $pp$ collisions at $\\sqrt{s}=8$ TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1346398?version=1","version":1}