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      Measurement of soft-drop jet observables in pp collisions with the ATLAS detector at √s = 13 TeV

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      Creators
      Aad, G.
      Aggarwal, A.
      Caron, S.
      Colasurdo, L.
      Groot, Nicolo de
      Fabiani, V.
      Filthaut, F.
      Gottardo, C.A.
      Igonkina, O.
      Ilic, N.
      König, A.C
      Pedraza Diaz, L.
      Schouwenberg, J.F.P.
      Date of Archiving
      2020
      Archive
      HEPData
      DOI
      https://doi.org/10.17182/hepdata.92073
      Related publications
      Measurement of soft-drop jet observables in pp collisions with the ATLAS detector at √s = 13 TeV  
      Publication type
      Dataset
      Access level
      Open access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/219357   https://hdl.handle.net/2066/219357
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      Organization
      High Energy Physics
      Experimental High Energy Physics
      Audience(s)
      Physics
      Key words
      parton distributions; soft drop jet mass distributions; dijet events.
      Abstract
      Jet substructure quantities are measured using jets groomed with the soft-drop grooming procedure in dijet events from 32.9 fb(-1) of pp collisions collected with the ATLAS detector at root s = 13 TeV. These observables are sensitive to a wide range of QCD phenomena. Some observables, such as the jet mass and opening angle between the two subjets which pass the soft-drop condition, can be described by a high-order (resummed) series in the strong coupling constant alpha(s). Other observables, such as the momentum sharing between the two subjets, are nearly independent of alpha(s). These observables can be constructed using all interacting particles or using only charged particles reconstructed in the inner tracking detectors. Track-based versions of these observables are not collinear safe, but are measured more precisely, and universal nonperturbative functions can absorb the collinear singularities. The unfolded data are directly compared with QCD calculations and hadron-level Monte Carlo simulations. The measurements are performed in different pseudorapidity regions, which are then used to extract quark and gluon jet shapes using the predicted quark and gluon fractions in each region. All of the parton shower and analytical calculations provide an excellent description of the data in most regions of phase space.
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