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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 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

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

• #### Table 2

Data from Figure 1a

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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

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

• #### Table 4

Data from Figure 1b

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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

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

• #### Table 6

Data from Figure 1c

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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

• #### Table 17

Data from Auxiliary Table 1

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

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Data from Auxiliary Table 2

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

• #### Table 19

Data from Auxiliary Table 3

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

• #### Table 20

Data from Auxiliary Table 4

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

• #### Table 21

Data from Auxiliary Table 5

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

• #### Table 22

Data from Auxiliary Table 6

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

• #### Table 23

Data from Auxiliary Table 7

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

• #### Table 24

Data from Auxiliary Table 8

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