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Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV

The ATLAS collaboration
No Journal Information, 2017

Abstract (data abstract)
A search for doubly-charged Higgs bosons with pairs of prompt, isolated, highly energetic leptons with the same electric charge is presented. The search uses proton-proton collision data at the center-of-mass energy of 13 TeV data sample corresponding to 36.1 $\mathrm{fb}^{-1}$ of integrated luminosity recorded in 2015 and 2016 by the ATLAS detector at the LHC. This analysis focuses on the decays $H^{\pm\pm}\to e^{\pm}e^{\pm}$, $H^{\pm\pm}\to e^{\pm}\mu^{\pm}$ and $H^{\pm\pm}\to \mu^{\pm}\mu^{\pm}$, fitting the dilepton mass spectra in several exclusive signal regions. No significant evidence of a signal was observed and corresponding limits on the production cross-section and consequently the lower limit on $m(H^{\pm \pm})$ were derived at $95\%$ confidence level. With $\ell={e,\mu}$, the observed lower limit on the mass of a doubly-charged Higgs only coupling to left-handed leptons varies from 770 GeV to 870 GeV (850 GeV expected) for $Br(H^{\pm\pm}\to \ell^{\pm}\ell^{\pm})=100\%$ and both the expected and observed mass limits are still above 450 GeV for $Br(H^{\pm\pm}\to \ell^{\pm}\ell^{\pm})=10\%$ for any combination of partial branching ratios.

  • Table 1

    Data from Figure 10a

    10.17182/hepdata.80462.v1/t1

    Observed and expected upper limit on the cross-section for $pp \to H^{++}H^{--}$ for a combination of partial branching ratios of...

  • Table 2

    Data from Figure 10b

    10.17182/hepdata.80462.v1/t2

    Observed and expected upper limit on the cross-section for $pp \to H^{++}H^{--}$ for a combination of partial branching ratios of...

  • Table 3

    Data from Figure 10c

    10.17182/hepdata.80462.v1/t3

    Observed and expected upper limit on the cross-section for $pp \to H^{++}H^{--}$ for a combination of partial branching ratios of...

  • Table 4

    Data from Figure 10d

    10.17182/hepdata.80462.v1/t4

    Observed and expected upper limit on the cross-section for $pp \to H^{++}H^{--}$ for a combination of partial branching ratios of...

  • Table 5

    Data from Figure 13a

    10.17182/hepdata.80462.v1/t5

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass as a function of the branching ratio $B(H_{L}^{\pm\pm} \to e^{\pm}e^{\pm})$...

  • Table 6

    Data from Figure 13b

    10.17182/hepdata.80462.v1/t6

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass as a function of the branching ratio $B(H_{L}^{\pm\pm} \to \mu^{\pm}\mu^{\pm})$...

  • Table 7

    Data from Figure 13c

    10.17182/hepdata.80462.v1/t7

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass as a function of the branching ratio $B(H_{L}^{\pm\pm} \to e^{\pm}\mu^{\pm})$...

  • Table 8

    Data from Figure 13d

    10.17182/hepdata.80462.v1/t8

    Minimum observed and expected lower limit (among all partial branching ratio combinations) on the $H_{L}^{\pm\pm}$ boson mass as a function...

  • Table 9

    Data from Figure 14a

    10.17182/hepdata.80462.v1/t9

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass as a function of the branching ratio $B(H_{R}^{\pm\pm} \to e^{\pm}e^{\pm})$...

  • Table 10

    Data from Figure 14b

    10.17182/hepdata.80462.v1/t10

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass as a function of the branching ratio $B(H_{R}^{\pm\pm} \to \mu^{\pm}\mu^{\pm})$...

  • Table 11

    Data from Figure 14c

    10.17182/hepdata.80462.v1/t11

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass as a function of the branching ratio $B(H_{R}^{\pm\pm} \to e^{\pm}\mu^{\pm})$...

  • Table 12

    Data from Figure 14d

    10.17182/hepdata.80462.v1/t12

    Minimum observed and expected lower limit (among all partial branching ratio combinations) on the $H_{R}^{\pm\pm}$ boson mass as a function...

  • Table 13

    Data from Figure 11 and Auxiliary Figures 1a and 1c

    10.17182/hepdata.80462.v1/t13

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 100%.

  • Table 14

    Data from Figure 12 and Auxiliary Figures 1b and 1d

    10.17182/hepdata.80462.v1/t14

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 100%.

  • Table 15

    Data from Auxiliary Figures 2a and 5a

    10.17182/hepdata.80462.v1/t15

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 90%.

  • Table 16

    Data from Auxiliary Figures 2b and 5b

    10.17182/hepdata.80462.v1/t16

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 90%.

  • Table 17

    Data from Auxiliary Figures 2c and 5c

    10.17182/hepdata.80462.v1/t17

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 80%.

  • Table 18

    Data from Auxiliary Figures 2d and 5d

    10.17182/hepdata.80462.v1/t18

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 80%.

  • Table 19

    Data from Auxiliary Figures 2e and 5e

    10.17182/hepdata.80462.v1/t19

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 70%.

  • Table 20

    Data from Auxiliary Figures 2f and 5f

    10.17182/hepdata.80462.v1/t20

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 70%.

  • Table 21

    Data from Auxiliary Figures 3a and 6a

    10.17182/hepdata.80462.v1/t21

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 60%.

  • Table 22

    Data from Auxiliary Figures 3b and 6b

    10.17182/hepdata.80462.v1/t22

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 60%.

  • Table 23

    Data from Auxiliary Figures 3c and 6c

    10.17182/hepdata.80462.v1/t23

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 50%.

  • Table 24

    Data from Auxiliary Figures 3d and 6d

    10.17182/hepdata.80462.v1/t24

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 50%.

  • Table 25

    Data from Auxiliary Figures 3e and 6e

    10.17182/hepdata.80462.v1/t25

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 40%.

  • Table 26

    Data from Auxiliary Figures 3f and 6f

    10.17182/hepdata.80462.v1/t26

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 40%.

  • Table 27

    Data from Auxiliary Figures 4a and 7a

    10.17182/hepdata.80462.v1/t27

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 30%.

  • Table 28

    Data from Auxiliary Figures 4b and 7b

    10.17182/hepdata.80462.v1/t28

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 30%.

  • Table 29

    Data from Auxiliary Figures 4c and 7c

    10.17182/hepdata.80462.v1/t29

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 20%.

  • Table 30

    Data from Auxiliary Figures 4d and 7d

    10.17182/hepdata.80462.v1/t30

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 20%.

  • Table 31

    Data from Auxiliary Figures 4e and 7e

    10.17182/hepdata.80462.v1/t31

    Observed and expected lower limit on the $H_{L}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 10%.

  • Table 32

    Data from Auxiliary Figures 4f and 7f

    10.17182/hepdata.80462.v1/t32

    Observed and expected lower limit on the $H_{R}^{\pm\pm}$ boson mass for all branching ratio combinations ($B(ee)$,$B(e\mu)$,$B(\mu\mu)$) that sum to 10%.

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