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Search for heavy lepton resonances decaying to a $Z$ boson and a lepton in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 1509 (2015) 108, 2015

Abstract (data abstract)
CERN-LHC. A search for heavy leptons decaying to a $Z$ boson and an electron or a muon is presented. The search is based on $pp$ collision data taken at $\sqrt{s}=8$ TeV by the ATLAS experiment at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb$^{-1}$. Three high-transverse-momentum electrons or muons are selected, with two of them required to be consistent with originating from a $Z$ boson decay. No significant excess above Standard Model background predictions is observed, and 95% confidence level limits on the production cross section of high-mass trilepton resonances are derived. The results are interpreted in the context of vector-like lepton and type-III seesaw models. For the vector-like lepton model, most heavy lepton mass values in the range 114-176 GeV are excluded. For the type-III seesaw model, most mass values in the range 100-468 GeV are excluded.

  • Table 1

    Data from Figure 3 a

    10.17182/hepdata.69501.v1/t1

    The $\delta m=m_{3\ell}-m_{ell^+\ell^-}$ distributions for the $4\ell$ category and $Z+e$ flavor channel.

  • Table 2

    Data from Figure 3 b

    10.17182/hepdata.69501.v1/t2

    The $\delta m=m_{3\ell}-m_{ell^+\ell^-}$ distributions for the $4\ell$ category and $Z+\mu$ flavor channel.

  • Table 3

    Data from Figure 3 c

    10.17182/hepdata.69501.v1/t3

    The $\delta m=m_{3\ell}-m_{ell^+\ell^-}$ distributions for the $3\ell+jj$ category and $Z+e$ flavor channel.

  • Table 4

    Data from Figure 3 d

    10.17182/hepdata.69501.v1/t4

    The $\delta m=m_{3\ell}-m_{ell^+\ell^-}$ distributions for the $3\ell+jj$ category and $Z+\mu$ flavor channel.

  • Table 5

    Data from Figure 3 e

    10.17182/hepdata.69501.v1/t5

    The $\delta m=m_{3\ell}-m_{ell^+\ell^-}$ distributions for the $3\ell$-only category and $Z+e$ flavor channel.

  • Table 6

    Data from Figure 3 f

    10.17182/hepdata.69501.v1/t6

    The $\delta m=m_{3\ell}-m_{ell^+\ell^-}$ distributions for the $3\ell$-only category and $Z+\mu$ flavor channel.

  • Table 7

    Data from Figure 5 a

    10.17182/hepdata.69501.v1/t7

    95\% CL upper limits on the vector-like lepton cross section, for heavy vector-like leptons coupling exclusively to electrons.

  • Table 8

    Data from Figure 5 b

    10.17182/hepdata.69501.v1/t8

    95\% CL upper limits on the vector-like lepton cross section, for heavy vector-like leptons coupling exclusively to muons.

  • Table 9

    Data from Figure 6 a

    10.17182/hepdata.69501.v1/t9

    95% CL upper limits on the type-III seesaw production cross section, for the seesaw leptons coupling exclusively to electrons.

  • Table 10

    Data from Figure 6 b

    10.17182/hepdata.69501.v1/t10

    95% CL upper limits on the type-III seesaw production cross section, for the seesaw leptons coupling exclusively to muons.

  • Table 11

    Data from Figure 7 a

    10.17182/hepdata.69501.v1/t11

    95% CL upper limits on $\sigma_{\mathrm{vis}}$ for the $Z+e$ flavour channel, derived without dividing events into the three categories.

  • Table 12

    Data from Figure 7 b

    10.17182/hepdata.69501.v1/t12

    95% CL upper limits on $\sigma_{\mathrm{vis}}$ for the $Z+\mu$ flavour channel, derived without dividing events into the three categories.

  • Table 13

    Data from Figure 7 a (auxiliary)

    10.17182/hepdata.69501.v1/t13

    95% CL upper limits on $\sigma_{\mathrm{vis}}$ for the $Z+e$ flavour channel, for events in the four lepton signal region.:.

  • Table 14

    Data from Figure 7 b (auxiliary)

    10.17182/hepdata.69501.v1/t14

    95% CL upper limits on $\sigma_{\mathrm{vis}}$ for the $Z+\mu$ flavour channel, for events in the four lepton signal region.

  • Table 15

    Data from Figure 8 a (auxiliary)

    10.17182/hepdata.69501.v1/t15

    95% CL upper limits on $\sigma_{\mathrm{vis}}$ for the $Z+e$ flavour channel, for events in the two-jet signal region.

  • Table 16

    Data from Figure 8 b (auxiliary)

    10.17182/hepdata.69501.v1/t16

    95% CL upper limits on $\sigma_{\mathrm{vis}}$ for the $Z+\mu$ flavour channel, for events in the two-jet signal region.

  • Table 17

    Data from Figure 9 a (auxiliary)

    10.17182/hepdata.69501.v1/t17

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)e^{\pm}$ decay in the inclusive category and $Z+e$ flavor channel, for events...

  • Table 18

    Data from Figure 9 b (auxiliary)

    10.17182/hepdata.69501.v1/t18

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)\mu^{\pm}$ decay in the inclusive category and $Z+\mu$ flavor channel, for events...

  • Table 19

    Data from Figure 10 a (auxiliary)

    10.17182/hepdata.69501.v1/t19

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)e^{\pm}$ decay in the $4\ell$ category and $Z+e$ flavor channel, for events...

  • Table 20

    Data from Figure 10 b (auxiliary)

    10.17182/hepdata.69501.v1/t20

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)\mu^{\pm}$ decay in the $4\ell$ category and $Z+\mu$ flavor channel, for events...

  • Table 21

    Data from Figure 11 a (auxiliary)

    10.17182/hepdata.69501.v1/t21

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)e^{\pm}$ decay in the $3\ell+jj$ category and $Z+e$ flavor channel, for events...

  • Table 22

    Data from Figure 11 b (auxiliary)

    10.17182/hepdata.69501.v1/t22

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)\mu^{\pm}$ decay in the $3\ell+jj$ category and $Z+\mu$ flavor channel, for events...

  • Table 23

    Data from Figure 12 a (auxiliary)

    10.17182/hepdata.69501.v1/t23

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)e^{\pm}$ decay in the $3\ell$-only category and $Z+e$ flavor channel, for events...

  • Table 24

    Data from Figure 12 b (auxiliary)

    10.17182/hepdata.69501.v1/t24

    Efficiencies for reconstructing and correctly identifying the $L^{\pm}\rightarrow Z(\ell\ell)\mu^{\pm}$ decay in the $3\ell$-only category and $Z+\mu$ flavor channel, for events...

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