Abstract (data abstract)

CERN-LHC. Results of a search for the electroweak associated production of charginos and next-to-lightest neutralinos, pairs of charginos or pairs of tau sleptons are presented. These processes are characterised by final states with at least two hadronically decaying tau leptons, missing transverse momentum and low jet activity. The analysis is based on an integrated luminosity of 20.3 fb-1 of proton-proton collisions at sqrt(s) = 8 TeV recorded with the ATLAS experiment at the Large Hadron Collider. No significant excess is observed with respect to the predictions from Standard Model processes. Limits are set at 95% confidence level on the masses of the lighter chargino and next-to-lightest neutralino for various hypotheses for the lightest neutralino mass in simplified models. In the scenario of direct production of chargino pairs, with each chargino decaying into the lightest neutralino via an intermediate tau slepton, chargino masses up to 345 GeV are excluded for a massless lightest neutralino. For associated production of mass-degenerate charginos and next-to-lightest neutralinos, both decaying into the lightest neutralino via an intermediate tau slepton, masses up to 410 GeV are excluded for a massless lightest neutralino.

Table 1

Data from Figure 03a

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The stransverse mass distribution in the multi-jet CR-C1N2.
Table 2

Data from Figure 03b

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Mt(tau1)+Mt(tau2) distribution in the multi-jet CR C1C1.
Table 3

Data from Figure 03c

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Effective mass distribution in the multi-jet CR DS-highMass.
Table 4

Data from Figure 03d

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Effective mass distribution in the multi-jet CR DS-lowMass.
Table 5

Data from Figure 04a

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Distribution of Met in the W+jets control region with 20.3/fb.
Table 6

Data from Figure 04b

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Distribution of Meff in the W+jets control region with 20.3/fb.
Table 7

Data from Figure 04c

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Distribution of Mt2 in the W+jets control region with 20.3/fb.
Table 8

Data from Figure 04d

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Distribution of Mt(tau1)+Mt(tau2) in the W+jets control region with 20.3/fb.
Table 9

Data from Figure 05a

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Distribution of Meff in the W+jets control region with 20.3/fb.
Table 10

Data from Figure 05b

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Distribution of Meff in the Z+jets control region with 20.3/fb.
Table 11

Data from Figure 05c

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The stransverse mass distribution in the WW-C1N2 validation region.
Table 12

Data from Figure 05d

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Mt(tau1)+Mt(tau2) distribution in Top-VR.
Table 13

Data from Figure 06a

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The stransverse mass distribution in SR-C1N2.
Table 14

Data from Figure 06b

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Mt(tau1)+Mt(tau2) distribution in SR-C1C1.
Table 15

Data from Figure 06c

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Effective mass distribution in SRDS-highMass.
Table 16

Data from Figure 06d

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Effective mass distribution in SRDS-lowMass.
Table 17

Data from Figure 07a

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Expected 95% CL exclusion limits for simplified models with a combination of chargino-neutralino and chargino-chargino production.
Table 18

Data from Figure 07a

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Observed 95% CL exclusion limits for simplified models with a combination of chargino-neutralino and chargino-chargino production.
Table 19

Data from Figure 07b

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Expected 95% CL exclusion limits for simplified models with chargino-chargino production.
Table 20

Data from Figure 07b

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Observed 95% CL exclusion limits for simplified models with chargino-chargino production.
Table 21

Data from Figure 08a

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Upper limits on the cross section for production of only right-handed stau pairs.
Table 22

Data from Figure 08b

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Upper limits on the cross section for production of only left-handed stau pairs.
Table 23

Data from Figure 09

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Upper limits on the signal strength for the associated production of right-handed and left-handed stau pairs.
Table 24

Data from Figure 10a

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Expected 95% CL exclusion limits for the pMSSM models with fixed stau mass, M1=50 GeV.
Table 25

Data from Figure 10a

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Observed 95% CL exclusion limits for the pMSSM models with fixed stau mass, M1=50 GeV.
Table 26

Data from Figure 10b

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Expected 95% CL exclusion limits for the pMSSM models with variable stau mass, M1=75 GeV.
Table 27

Data from Figure 10b

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Observed 95% CL exclusion limits for the pMSSM models with variable stau mass, M1=75 GeV.
Table 28

Data from Figure 11a

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Numbers give 95% CL excluded model cross sections for the simplified models with chargino-chargino production.
Table 29

Data from Figure 11b

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Numbers give 95% CL excluded model cross sections for the simplified models with chargino-neutralino production.
Table 30

Data from Figure 12a

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SR with best expected p0-value for each point for the simplified models with chargino-neutralino and chargino-chargino production. SR-C1N2 (SR-C1C1) is...
Table 31

Data from Figure 12b

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SR with best expected p0-value for each point for the simplified models with chargino-chargino production. SR-C1N2 (SR-C1C1) is indicated with...
Table 32

Data from Figure 12c

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SR with best expected p0-value for each point for direct stau pair production. SR-C1N2 (SR-C1C1) is indicated with 1 (2)...
Table 33

Data from Figure 12d

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SR with best expected p0-value for each point for direct stau pair production (left-handed). SR-C1N2 (SR-C1C1) is indicated with 1...
Table 34

Data from Figure 12e

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SR with best expected p0-value for each point for direct stau pair production (right-handed). SR-C1N2 (SR-C1C1) is indicated with 1...
Table 35

Data from Figure 13a

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SR with best expected p0-value for each point for the pMSSM models with fixed stau mass, M1=50 GeV. SR-C1N2 (SR-C1C1)...
Table 36

Data from Figure 13b

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SR with best expected p0-value for each point for the pMSSM models with variable stau mass, M1=75 GeV. SR-C1N2 (SR-C1C1)...
Table 37

Data from Figure 14

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Cutflows for the three SUSY reference points. The event yields have been normalised to 20.3/fb.
Table 38

Data from Figure 15

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Cutflows for data and the SM backgrounds estimated from MC.
Table 39

Data from Figure 16

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Detailed information for the three SUSY benchmark grid points (from left to right): the reference point(1: (chargino1(neutralino2),neutralino1)=(250,100)GeV, 2: (chargino1,neutralino1)=(250,50) GeV,...
Table 40

Data from Figure 17a

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Number of generated events for the simplified models with chargino-neutralino production.
Table 41

Data from Figure 17b

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Number of generated events for the simplified models with chargino-chargino production.
Table 42

Data from Figure 17c

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Number of generated events for direct left-handed stau pair production.
Table 43

Data from Figure 17d

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Number of generated events for direct right-handed stau pair production.
Table 44

Data from Figure 18a

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Production cross section for the simplified models with chargino-neutralino production.
Table 45

Data from Figure 18b

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Production cross section for the simplified models with chargino-chargino production.
Table 46

Data from Figure 18c

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Production cross section for direct left-handed stau pair production.
Table 47

Data from Figure 18d

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Production cross section for direct right-handed stau pair production.
Table 48

Data from Figure 19a

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Acceptance for the simplified models with chargino-neutralino production.
Table 49

Data from Figure 19b

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Acceptance for the simplified models with chargino-chargino production.
Table 50

Data from Figure 19c

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Acceptance for direct left-handed stau pair production.
Table 51

Data from Figure 19d

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Acceptance for direct right-handed stau pair production.
Table 52

Data from Figure 20a

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Efficiency for the simplified models with chargino-neutralino production.
Table 53

Data from Figure 20b

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Efficiency for the simplified models with chargino-chargino production.
Table 54

Data from Figure 20c

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Efficiency for direct stau (the left-handed) pair production.
Table 55

Data from Figure 20d

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Efficiency for direct stau (the right-handed) pair production.
Table 56

Data from Figure 21a

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Experimental systematics (in percentage) for the simplified models with chargino-neutralino production.
Table 57

Data from Figure 21b

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Experimental systematics (in percentage) for the simplified models with chargino-chargino production.
Table 58

Data from Figure 21c

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Experimental systematics (in percentage) for direct stau (the left-handed) pair production.
Table 59

Data from Figure 21d

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Experimental systematics (in percentage) for direct stau (the right-handed) pair production.
Table 60

Data from Figure 22a

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Observed CLs for the simplified models with chargino-neutralino production.
Table 61

Data from Figure 22b

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Observed CLs for the simplified models with chargino-chargino production.
Table 62

Data from Figure 22c

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Observed CLs for direct stau (the left-handed) pair production.
Table 63

Data from Figure 22d

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Observed CLs for direct stau (the right-handed) pair production.
Table 64

Data from Figure 23a

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Expected CLs for the simplified models with chargino-neutralino production.
Table 65

Data from Figure 23b

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Expected CLs for the simplified models with chargino-chargino production.
Table 66

Data from Figure 23c

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Expected CLs for direct stau (the left-handed) pair production.
Table 67

Data from Figure 23d

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Expected CLs for direct stau (the right-handed) pair production.

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