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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 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%.