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Search for dark matter produced in association with bottom or top quarks in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2017

Abstract (data abstract)
A search for weakly-interacting-massive-particle (WIMP) dark matter produced in association with bottom or top quarks is presented. Final states containing third generation quarks and missing transverse momentum are considered. The analysis uses 36.1 fb-1 of proton-proton collisions data recorded by the ATLAS experiment at sqrt(s)=13 TeV in 2015 and 2016. No significant deviation from the background prediction is observed. The results are interpreted in the framework of simplified models of spin-0 dark matter mediators. For colour-neutral spin-0 mediators decaying into a pair of dark matter particles, signals with scalar mediator masses below 50 GeV in top quark final states are excluded, assuming a dark matter mass of 1 GeV and unitary coupling. For bottom quark final states 300 times the value of the production cross section for signals with scalar and pseudoscalar mediator masses between 10 and 50 GeV are excluded, assuming a dark matter mass of 1 GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding to a dark matter relic density consistent with measurements.

  • Table 1

    10.17182/hepdata.80080.v1/t1

    - - - - - - - - Overview of HEPData Record - - - - - - - -...

  • Table 2

    Data from Table 6

    10.17182/hepdata.80080.v1/t2

    Summary of the main systematic uncertainties and their impact on the total SM background prediction in each of the signal...

  • Table 3

    Data from Table 7

    10.17182/hepdata.80080.v1/t3

    Fit results in SRb1 and SRb2 for an integrated luminosity of $36.1 fb^{-1}$. The background normalisation parameters are obtained from...

  • Table 4

    Data from Table 8

    10.17182/hepdata.80080.v1/t4

    Fit results in SRt1, SRt2 and SRt3 for an integrated luminosity of $36.1 fb^{-1}$. The background normalisation parameters are obtained...

  • Table 5

    Data from Table 9

    10.17182/hepdata.80080.v1/t5

    95% CL upper limits on the visible cross-section ($\langle\epsilon\mathcal{A}\sigma\rangle^{\rm obs}_{95}$) and on the number of BSM events ($S^{\rm obs}_{95}$ )....

  • Table 6

    Data from Figure 4a

    10.17182/hepdata.80080.v1/t6

    Comparison of the data with the post-fit SM prediction of the $E_{\mathrm T}^{\mathrm{miss}}$ distribution in SRb1. The last bins include...

  • Table 7

    Data from Figure 4b

    10.17182/hepdata.80080.v1/t7

    Comparison of the data with the post-fit SM prediction of the $\cos{\theta}^*_{bb}$ distribution in SRb2. The last bins include overflows,...

  • Table 8

    Data from Figure 4c

    10.17182/hepdata.80080.v1/t8

    Comparison of the data with the post-fit SM prediction of the $m_{\mathrm T}^{\mathrm{b,min}}$ distribution in SRt1. The last bins include...

  • Table 9

    Data from Figure 4d

    10.17182/hepdata.80080.v1/t9

    Comparison of the data with the post-fit SM prediction of the $E_{\mathrm T}^{\mathrm{miss,sig}}$ distribution in SRt2. The last bins include...

  • Table 10

    Data from Figure 4e

    10.17182/hepdata.80080.v1/t10

    Comparison of the data with the post-fit SM prediction of the $\xi^{+}_{\ell\ell}$ distribution in SRt3. The last bins include overflows,...

  • Table 11

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t11

    Expected exclusion limits for colour-neutral scalar model in the SRb2 as a function of the mediator mass for a DM...

  • Table 12

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t12

    Observed exclusion limits for colour-neutral scalar model in SRb2 as a function of the mediator mass for a DM mass...

  • Table 13

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t13

    Expected exclusion limits for colour-neutral scalar model in the SRt1/SRt2 as a function of the mediator mass for a DM...

  • Table 14

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t14

    Observed exclusion limits for colour-neutral scalar model in SRt1/SRt2 as a function of the mediator mass for a DM mass...

  • Table 15

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t15

    Expected exclusion limits for colour-neutral scalar model in SRt3 as a function of the mediator mass for a DM mass...

  • Table 16

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t16

    Observed exclusion limits for colour-neutral scalar model in SRt3 as a function of the mediator mass for a DM mass...

  • Table 17

    Data from Figure 5b

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    Expected exclusion limits for colour-neutral pseudo-scalar model in SRb2 as a function of the mediator mass for a DM mass...

  • Table 18

    Data from Figure 5b

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    Observed exclusion limits for colour-neutral pseudo-scalar model in SRb2 as a function of the mediator mass for a DM mass...

  • Table 19

    Data from Figure 5b

    10.17182/hepdata.80080.v1/t19

    Expected exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the mediator mass for a DM mass...

  • Table 20

    Data from Figure 5b

    10.17182/hepdata.80080.v1/t20

    Observed exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the mediator mass for a DM mass...

  • Table 21

    Data from Figure 5b

    10.17182/hepdata.80080.v1/t21

    Expected limits for colour-neutral pseudo-scalar model in SRt3 as a function of the mediator mass for a DM mass of...

  • Table 22

    Data from Figure 5b

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    Observed exclusion limits for colour-neutral pseudo-scalar model in SRt3 as a function of the mediator mass for a DM mass...

  • Table 23

    Data from Figure 6a

    10.17182/hepdata.80080.v1/t23

    Expected exclusion limits for colour-neutral scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

  • Table 24

    Data from Figure 6a

    10.17182/hepdata.80080.v1/t24

    Observed exclusion limits for colour-neutral scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

  • Table 25

    Data from Figure 6a

    10.17182/hepdata.80080.v1/t25

    Expected exclusion limits for colour-neutral scalar model in SRt3 as a function of the DM mass for a mediator mass...

  • Table 26

    Data from Figure 6a

    10.17182/hepdata.80080.v1/t26

    Observed exclusion limits for colour-neutral scalar model in SRt3 as a function of the DM mass for a mediator mass...

  • Table 27

    Data from Figure 6b

    10.17182/hepdata.80080.v1/t27

    Expected exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

  • Table 28

    Data from Figure 5a

    10.17182/hepdata.80080.v1/t28

    Observed exclusion limits for colour-neutral pseudo-scalar model in SRt1/SRt2 as a function of the DM mass for a mediator mass...

  • Table 29

    Data from Figure 6b

    10.17182/hepdata.80080.v1/t29

    Expected exclusion limits for colour-neutral pseudo-scalar model in SRt3 as a function of the DM mass for a mediator mass...

  • Table 30

    Data from Figure 6b

    10.17182/hepdata.80080.v1/t30

    Observed xclusion limits for colour-neutral pseudo-scalar model in SRt3 as a function of the DM mass for a mediator mass...

  • Table 31

    Data from Figure 7

    10.17182/hepdata.80080.v1/t31

    Comparison of the 90% CL limits on the spin-independent DM–nucleon cross-section versus mediator mass between these results and the direct-detection...

  • Table 32

    Data from Figure 8

    10.17182/hepdata.80080.v1/t32

    Expected exclusion limits for colour-charged scalar mediators ($b$-FDM) as a function of the mediator and DM masses for $36.1fb^{-1}$ of...

  • Table 33

    Data from Figure 8

    10.17182/hepdata.80080.v1/t33

    Exclusion observed limits for colour-charged scalar mediators ($b-$FDM) as a function of the mediator and DM masses for $36.1fb^{-1}$ of...

  • Table 34

    Data from Figure 11a

    10.17182/hepdata.80080.v1/t34

    Comparison of the data with the post-fit Monte Carlo prediction of sub leading jet $p_{T}$ in SRb1. The last bin...

  • Table 35

    Data from Figure 11b

    10.17182/hepdata.80080.v1/t35

    Comparison of the data with the post-fit Monte Carlo prediction of $H_{\mathrm T}^{ratio}$ distribution in SRb2. The last bin includes...

  • Table 36

    Data from Figure 11c

    10.17182/hepdata.80080.v1/t36

    Comparison of the data with the post-fit Monte Carlo prediction of $\Delta R_{bb}$ in SRt1. The last bin includes overflows....

  • Table 37

    Data from Figure 11d

    10.17182/hepdata.80080.v1/t37

    Comparison of the data with the post-fit Monte Carlo prediction of $M_{\mathrm T}^{b,min}$ in SRt2. The last bin includes overflows....

  • Table 38

    Data from Figure 11e

    10.17182/hepdata.80080.v1/t38

    Comparison of the data with the post-fit Monte Carlo prediction of $\Delta \phi_{boost}$ in SRt3. The last bin includes overflows....

  • Table 39

    Data from Table 19

    10.17182/hepdata.80080.v1/t39

    Acceptance of the SRb1 selection of the $b$-FDM model signal samples

  • Table 40

    Data from Table 19

    10.17182/hepdata.80080.v1/t40

    Efficiency of the SRb1 selection of the $b$-FDM model signal samples

  • Table 41

    Data from Table 20

    10.17182/hepdata.80080.v1/t41

    Acceptance of the SRb2 selection of the colour-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 42

    Data from Table 21

    10.17182/hepdata.80080.v1/t42

    Efficiency of the SRb2 selection to the colour-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 43

    Data from Table 22

    10.17182/hepdata.80080.v1/t43

    Efficiency of the SRb2 selection to the colour-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 44

    Data from Table 23

    10.17182/hepdata.80080.v1/t44

    Acceptance of SRb2 selection to the colour-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced in...

  • Table 45

    Data from Table 24

    10.17182/hepdata.80080.v1/t45

    Acceptance of the SRt2 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 46

    Data from Table 24

    10.17182/hepdata.80080.v1/t46

    Acceptance of the SRt1 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 47

    Data from Table 24

    10.17182/hepdata.80080.v1/t47

    Efficiency of the SRt2 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 48

    Data from Table 24

    10.17182/hepdata.80080.v1/t48

    Efficiency of the SRt1 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 49

    Data from Table 25

    10.17182/hepdata.80080.v1/t49

    Acceptance of the SRt2 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 50

    Data from Table 25

    10.17182/hepdata.80080.v1/t50

    Acceptance of the SRt1 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 51

    Data from Table 25

    10.17182/hepdata.80080.v1/t51

    Efficiency of the SRt2 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 52

    Data from Table 25

    10.17182/hepdata.80080.v1/t52

    Efficiency of the SRt1 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 53

    Data from Table 26

    10.17182/hepdata.80080.v1/t53

    Acceptance of the SRt3 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 54

    Data from Table 26

    10.17182/hepdata.80080.v1/t54

    Efficiency of the SRt3 selections to the color-neutral simplified model samples with scalar mediator decaying into dark matter pairs produced...

  • Table 55

    Data from Table 27

    10.17182/hepdata.80080.v1/t55

    Acceptance of the SRt3 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 56

    Data from Table 27

    10.17182/hepdata.80080.v1/t56

    Efficiency of the SRt3 selections to the color-neutral simplified model samples with pseudo-scalar mediator decaying into dark matter pairs produced...

  • Table 57

    Data from Table 28

    10.17182/hepdata.80080.v1/t57

    Number of signal events selected at different stages of the SRb1 selections for the $b$-FDM benchmark model $m(\phi_b,\chi)=(1000,35)$GeV

  • Table 58

    Data from Table 29

    10.17182/hepdata.80080.v1/t58

    Number of signal events selected at different stages of the SRb2 selections for the $b\bar{b} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV, $g=1$.

  • Table 59

    Data from Table 30

    10.17182/hepdata.80080.v1/t59

    Number of signal events selected at different stages of the SRt1 selections for the $t \bar{t} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

  • Table 60

    Data from Table 31

    10.17182/hepdata.80080.v1/t60

    Number of signal events selected at different stages of the SRt2 selections for the $t \bar{t} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

  • Table 61

    Data from Table 32

    10.17182/hepdata.80080.v1/t61

    Number of signal events selected at different stages of the SRt1 selections for the $t \bar{t} +a$ benchmark model $m(a,\chi)=(20,1)$GeV,...

  • Table 62

    Data from Table 33

    10.17182/hepdata.80080.v1/t62

    Number of signal events selected at different stages of the SRt2 selections for the $t \bar{t} +a$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

  • Table 63

    Data from Table 34

    10.17182/hepdata.80080.v1/t63

    Number of signal events selected at different stages of the SRt3 selections for the $t \bar{t} +\phi$ benchmark model $m(\phi,\chi)=(20,1)$GeV,...

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