Identification of hadronic tau lepton decays using a deep neural network

The CMS collaboration
JINST 17 (2022) P07023, 2022.

Abstract (data abstract)
A new algorithm is presented to discriminate reconstructed hadronic decays of tau leptons (tau_h) that originate from genuine tau leptons in the CMS detector against tau_h candidates that originate from quark or gluon jets, electrons, or muons. The algorithm inputs information from all reconstructed particles in the vicinity of a tau_h candidate and employs a deep neural network with convolutional layers to efficiently process the inputs. This algorithm leads to a significantly improved performance compared with the previously used one. For example, the efficiency for a genuine tau_h to pass the discriminator against jets increases by 10-30% for a given efficiency for quark and gluon jets. Furthermore, a more efficient tau_h reconstruction is introduced that incorporates additional hadronic decay modes. The superior performance of the new algorithm to discriminate against jets, electrons, and muons and the improved tau_h reconstruction method are validated with LHC proton-proton collision data at sqrt(s) = 13 TeV.

  • Figure 1

    Figure 1

    10.17182/hepdata.116281.v1/t1

    Decay mode confusion matrix. For a given generated decay mode, the fractions of reconstructed tau_h in different decay modes are...

  • Figure 4 - top left, low pt DeepTau vs jet

    top left, low pt

    10.17182/hepdata.116281.v1/t2

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top left, low pt DeepTau vs jet WPs

    top left, low pt

    10.17182/hepdata.116281.v1/t3

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top left, low pt MVA WPs

    top left, low pt

    10.17182/hepdata.116281.v1/t4

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top left, low pt MVA updated Decay Mode WPs

    top left, low pt

    10.17182/hepdata.116281.v1/t5

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top right, high pt DeepTau vs jet

    top right, high pt

    10.17182/hepdata.116281.v1/t6

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top right, high pt DeepTau vs jet WPs

    top right, high pt

    10.17182/hepdata.116281.v1/t7

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top right, high pt MVA WPs

    top right, high pt

    10.17182/hepdata.116281.v1/t8

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - top right, high pt MVA updated Decay Mode WPs

    top right, high pt

    10.17182/hepdata.116281.v1/t9

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom left, low pt DeepTau vs jet

    bottom left, low pt

    10.17182/hepdata.116281.v1/t10

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom left, low pt DeepTau vs jet WPs

    bottom left, low pt

    10.17182/hepdata.116281.v1/t11

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom left, low pt MVA WPs

    bottom left, low pt

    10.17182/hepdata.116281.v1/t12

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom left, low pt MVA updated Decay Mode WPs

    bottom left, low pt

    10.17182/hepdata.116281.v1/t13

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom right, high pt DeepTau vs jet

    bottom right, high pt

    10.17182/hepdata.116281.v1/t14

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom right, high pt DeepTau vs jet WPs

    bottom right, high pt

    10.17182/hepdata.116281.v1/t15

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom right, high pt MVA WPs

    bottom right, high pt

    10.17182/hepdata.116281.v1/t16

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 4 - bottom right, high pt MVA updated Decay Mode WPs

    bottom right, high pt

    10.17182/hepdata.116281.v1/t17

    Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper...

  • Figure 5

    Figure 5

    10.17182/hepdata.116281.v1/t18

    Efficiencies for simulated tau_h decays with |eta| < 2.3 to pass the following reconstruction and identification requirements: to be reconstructed...

  • Figure 6 - left, low pt DeepTau vs ele

    left, low pt

    10.17182/hepdata.116281.v1/t19

    Efficiency for electrons against efficiency for genuine tau_h to pass the MVA and De discriminators, separately for electrons and tau_h...

  • Figure 6 - left, low pt DeepTau vs ele WPs

    left, low pt

    10.17182/hepdata.116281.v1/t20

    Efficiency for electrons against efficiency for genuine tau_h to pass the MVA and De discriminators, separately for electrons and tau_h...

  • Figure 6 - left, low pt MVA WPs

    left, low pt

    10.17182/hepdata.116281.v1/t21

    Efficiency for electrons against efficiency for genuine tau_h to pass the MVA and De discriminators, separately for electrons and tau_h...

  • Figure 6 - right, high pt DeepTau vs ele

    right, high pt

    10.17182/hepdata.116281.v1/t22

    Efficiency for electrons against efficiency for genuine tau_h to pass the MVA and De discriminators, separately for electrons and tau_h...

  • Figure 6 - right, high pt DeepTau vs ele WPs

    right, high pt

    10.17182/hepdata.116281.v1/t23

    Efficiency for electrons against efficiency for genuine tau_h to pass the MVA and De discriminators, separately for electrons and tau_h...

  • Figure 6 - right, high pt MVA WPs

    right, high pt

    10.17182/hepdata.116281.v1/t24

    Efficiency for electrons against efficiency for genuine tau_h to pass the MVA and De discriminators, separately for electrons and tau_h...

  • Figure 7 - left, low pt DeepTau vs muon

    left, low pt

    10.17182/hepdata.116281.v1/t25

    Efficiency for muons against efficiency for simulated τh to pass the cutoff-based and Dμ discriminators, separately for muons and tau_h...

  • Figure 7 - left, low pt DeepTau vs muon WPs

    left, low pt

    10.17182/hepdata.116281.v1/t26

    Efficiency for muons against efficiency for simulated τh to pass the cutoff-based and Dμ discriminators, separately for muons and tau_h...

  • Figure 7 - left, low pt cut based WPs

    left, low pt

    10.17182/hepdata.116281.v1/t27

    Efficiency for muons against efficiency for simulated τh to pass the cutoff-based and Dμ discriminators, separately for muons and tau_h...

  • Figure 7 - right, high pt DeepTau vs muon

    right, high pt

    10.17182/hepdata.116281.v1/t28

    Efficiency for muons against efficiency for simulated τh to pass the cutoff-based and Dμ discriminators, separately for muons and tau_h...

  • Figure 7 - right, high pt DeepTau vs muon WPs

    right, high pt

    10.17182/hepdata.116281.v1/t29

    Efficiency for muons against efficiency for simulated τh to pass the cutoff-based and Dμ discriminators, separately for muons and tau_h...

  • Figure 7 - right, high pt cut based WPs

    right, high pt

    10.17182/hepdata.116281.v1/t30

    Efficiency for muons against efficiency for simulated τh to pass the cutoff-based and Dμ discriminators, separately for muons and tau_h...

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