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Search for a Heavy Neutral Particle Decaying to $e\mu$, $e\tau$, or $\mu\tau$ in $pp$ Collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector

The ATLAS collaboration
Phys.Rev.Lett. 115 (2015) 031801, 2015

Abstract (data abstract)
CERN-LHC. This Letter presents a search for a heavy neutral particle decaying into an opposite-sign different-flavor dilepton pair, $e^\pm \mu^\mp$, $e^\pm \tau^\mp$, or $\mu^\pm \tau^\mp$ using 20.3 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 8$ TeV collected by the ATLAS detector at the LHC. The numbers of observed candidate events are compatible with the Standard Model expectations. Limits are set on the cross section of new phenomena in two scenarios: the production of $\tilde{\nu}_{\tau}$ in $R$-parity-violating supersymmetric models and the production of a lepton-flavor-violating $Z'$ vector boson.

  • Table 1

    Data from Figure 1a

    10.17182/hepdata.68482.v1/t1

    Observed and predicted $e\mu$ invariant mass distributions.

  • Table 2

    Data from Figure 1a

    10.17182/hepdata.68482.v1/t2

    The expected invariant mass distribution of signal Z'@0.75TeV and $\tilde{\nu}_{\tau}$@1TeV. The arbitrary choice of couplings are: $\lambda_{311}^{'}=0.11$ and $\lambda_{i3k}=0.07$ for...

  • Table 3

    Data from Figure 1b

    10.17182/hepdata.68482.v1/t3

    Observed and predicted $e\tau$ invariant mass distributions.

  • Table 4

    Data from Figure 1b

    10.17182/hepdata.68482.v1/t4

    The expected invariant mass distribution of signal Z'@0.75TeV and $\tilde{\nu}_{\tau}$@1TeV. The arbitrary choice of couplings are: $\lambda_{311}^{'}=0.11$ and $\lambda_{i3k}=0.07$ for...

  • Table 5

    Data from Figure 1c

    10.17182/hepdata.68482.v1/t5

    Observed and predicted $\mu\tau$ invariant mass distributions.

  • Table 6

    Data from Figure 1c

    10.17182/hepdata.68482.v1/t6

    The expected invariant mass distribution of signal Z'@0.75TeV and $\tilde{\nu}_{\tau}$@1TeV. The arbitrary choice of couplings are: $\lambda_{311}^{'}=0.11$ and $\lambda_{i3k}=0.07$ for...

  • Table 7

    Data from Figure 2

    10.17182/hepdata.68482.v1/t7

    Expected cross section times branching ratio as a function of $\tilde{\nu}_{\tau}$ mass in the $e\mu$ channel for the arbitrary choice...

  • Table 8

    Data from Figure 2

    10.17182/hepdata.68482.v1/t8

    The 95% CL limits on cross section times branching ratio as a function of $\tilde{\nu}_{\tau}$ mass in the $e\mu$ channel.

  • Table 9

    Data from Figure 2

    10.17182/hepdata.68482.v1/t9

    Expected cross section times branching ratio as a function of Z' mass in the $e\mu$ channel for the arbitrary choice...

  • Table 10

    Data from Figure 2

    10.17182/hepdata.68482.v1/t10

    The 95% CL limits on cross section times branching ratio as a function of Z' mass in the $e\mu$ channel.

  • Table 11

    Data from Figure 2

    10.17182/hepdata.68482.v1/t11

    The 95% CL limits on cross section times branching ratio as a function of $\tilde{\nu}_{\tau}$ mass in the $e\tau$ channel.

  • Table 12

    Data from Figure 2

    10.17182/hepdata.68482.v1/t12

    The 95% CL limits on cross section times branching ratio as a function of Z' mass in the $e\tau$ channel.

  • Table 13

    Data from Figure 2

    10.17182/hepdata.68482.v1/t13

    The 95% CL limits on cross section times branching ratio as a function of $\tilde{\nu}_{\tau}$ mass in the $\mu\tau$ channel.

  • Table 14

    Data from Figure 2

    10.17182/hepdata.68482.v1/t14

    The 95% CL limits on cross section times branching ratio as a function of Z' mass in the $\mu\tau$ channel.

  • Table 15

    Data from Auxiliary Figure 3

    10.17182/hepdata.68482.v1/t15

    The 95% CL limits on lambda'_311 as a function of sneutrino mass for assumed value of lambda_i3k=0.07 for $e\mu$, $e\tau$...

  • Table 16

    Data from Table 1

    10.17182/hepdata.68482.v1/t16

    Estimated SM backgrounds and observed event yields for the validation and search region.

  • Table 17

    Data from Auxiliary Table 1

    10.17182/hepdata.68482.v1/t17

    Cut flow for signal $\tilde{\nu}_{\tau}$ and Z' at 1TeV mass point.

  • Table 18

    Data from Auxiliary Table 2

    10.17182/hepdata.68482.v1/t18

    Gaussian standard deviation of M(ll') distributions at various signal mass.

  • Table 19

    Data from Auxiliary Table 3

    10.17182/hepdata.68482.v1/t19

    Inputs used for the Z'-->$e\mu$ channel limit setting.

  • Table 20

    Data from Auxiliary Table 4

    10.17182/hepdata.68482.v1/t20

    Inputs used for the $\tilde{\nu}_{\tau}$-->$e\mu$ channel limit setting.

  • Table 21

    Data from Auxiliary Table 5

    10.17182/hepdata.68482.v1/t21

    Inputs used for the Z'-->$e\tau$ channel limit setting.

  • Table 22

    Data from Auxiliary Table 6

    10.17182/hepdata.68482.v1/t22

    Inputs used for the $\tilde{\nu}_{\tau}$ -->$e\tau$ channel limit setting.

  • Table 23

    Data from Auxiliary Table 7

    10.17182/hepdata.68482.v1/t23

    Inputs used for the Z'-->$\mu\tau$ channel limit setting.

  • Table 24

    Data from Auxiliary Table 8

    10.17182/hepdata.68482.v1/t24

    Inputs used for the $\tilde{\nu}_{\tau}$-->$\mu\tau$ channel limit setting.

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