Search for displaced vertices of oppositely charged leptons from decays of long-lived particles in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

The ATLAS collaboration
, 2019

Abstract (data abstract)
A search for long-lived particles decaying into an oppositely charged lepton pair, $\mu\mu$, $ee$, or $e\mu$, is presented using 32.8 fb$^{-1}$ of $pp$ collision data collected at $\sqrt{s}$ = 13 TeV by the ATLAS detector at the LHC. Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced from the primary $pp$ interaction region. No lepton pairs with an invariant mass greater than 12 GeV are observed, consistent with the background expectations derived from data. The result is interpreted in a supersymmetric model in which the lightest neutralino, produced via squark-antisquark production, decays into $\ell^{+}\ell^{'-}\nu$ ($\ell$, $\ell^{'} = e$, $\mu$) with a finite lifetime due to the presence of R-parity violating couplings. Cross-section limits are presented for specific squark and neutralino masses. For a 700 GeV squark, neutralinos with masses of 50-500 GeV and mean proper lifetimes corresponding to $c\tau$ values between 1 mm to 6 m are excluded. For a 1.6 TeV squark, $c\tau$ values between 3 mm to 1 m are excluded for 1.3 TeV neutralinos.

  • Overview

    10.17182/hepdata.90606.v1/t1

    <h1>Overview of reinterpretation material</h1><p><b>Important note:</b> A detailed explanation of the reinterpretation material can be found <a href="https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2017-04/hepdata_info.pdf">here</a>.<br/>Please read this stand-alone...

  • Table 1

    Data from Figure 1

    10.17182/hepdata.90606.v1/t2

    dRcos distribution of dimuon pairs (scaled) and dimuon vertices in the cosmic rays control region. The distribution of all dimuon...

  • Table 2

    Data from Figure 2a

    10.17182/hepdata.90606.v1/t3

    Dependence of the overall signal efficiency on the transverse decay radius Rxy of the long-lived Z' for Z' -> ee....

  • Table 3

    Data from Figure 2b

    10.17182/hepdata.90606.v1/t4

    Dependence of the overall signal efficiency on the pT of the long-lived Z' for Z' -> ee. The error bars...

  • Table 4

    Data from Figure 2c

    10.17182/hepdata.90606.v1/t5

    Dependence of the overall signal efficiency on the transverse decay radius Rxy of the long-lived Z' for Z' -> emu....

  • Table 5

    Data from Figure 2d

    10.17182/hepdata.90606.v1/t6

    Dependence of the overall signal efficiency on the pT of the long-lived Z' for Z' -> emu. The error bars...

  • Table 6

    Data from Figure 2e

    10.17182/hepdata.90606.v1/t7

    Dependence of the overall signal efficiency on the transverse decay radius Rxy of the long-lived Z' for Z' -> mumu....

  • Table 7

    Data from Figure 2f

    10.17182/hepdata.90606.v1/t8

    Dependence of the overall signal efficiency on the pT of the long-lived Z' for Z' -> mumu. The error bars...

  • Table 8

    Data from Figure 3a

    10.17182/hepdata.90606.v1/t9

    Overall signal efficiency as a function of the mean proper lifetime (ctau) of the neutralino for the lambda121 scenario of...

  • Table 9

    Data from Figure 3b

    10.17182/hepdata.90606.v1/t10

    Overall signal efficiency as a function of the mean proper lifetime (ctau) of the neutralino for the lambda122 scenario of...

  • Table 10

    Data from Figure 4a

    10.17182/hepdata.90606.v1/t11

    95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

  • Table 11

    Data from Figure 4b

    10.17182/hepdata.90606.v1/t12

    95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

  • Table 12

    Data from Figure 5a

    10.17182/hepdata.90606.v1/t13

    95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

  • Table 13

    Data from Figure 5b

    10.17182/hepdata.90606.v1/t14

    95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

  • Table 14

    Data from auxiliary Figure 1a

    10.17182/hepdata.90606.v1/t15

    Fraction of detector volume covered by the material veto as a function of z and Rxy of the displaced dilepton...

  • Table 15

    Data from auxiliary Figure 1b

    10.17182/hepdata.90606.v1/t16

    Fraction of detector volume covered by the disabled pixel modules veto veto as a function of z and Rxy of...

  • Table 16

    Data from auxiliary Figure 2

    10.17182/hepdata.90606.v1/t17

    Observed Rxy distribution of vertices composed of two non-leptonic tracks in a control sample in the data and the predicted...

  • Table 17

    Data from auxiliary Figure 3

    10.17182/hepdata.90606.v1/t18

    Rxy distributions of Kshort vertices from the large radius tracking in the data and background MC samples. Data has been...

  • Table 18

    Data from auxiliary Figure 5a

    10.17182/hepdata.90606.v1/t19

    Acceptance per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> eenu. The...

  • Table 19

    Data from auxiliary Figure 5b

    10.17182/hepdata.90606.v1/t20

    Acceptance per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> emunu. The...

  • Table 20

    Data from auxiliary Figure 5c

    10.17182/hepdata.90606.v1/t21

    Acceptance per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> mumunu. The...

  • Table 21

    Data from auxiliary Figure 6a

    10.17182/hepdata.90606.v1/t22

    Detection efficiency per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> eenu....

  • Table 22

    Data from auxiliary Figure 6b

    10.17182/hepdata.90606.v1/t23

    Detection efficiency per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> emunu....

  • Table 23

    Data from auxiliary Figure 6c

    10.17182/hepdata.90606.v1/t24

    Detection efficiency per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> mumunu....

  • Table 24

    Data from auxiliary Figure 7a

    10.17182/hepdata.90606.v1/t25

    Overall signal efficiency (acceptance times efficiency) per decay as a function of the mean proper lifetime (ctau) of the neutralino...

  • Table 25

    Data from auxiliary Figure 7b

    10.17182/hepdata.90606.v1/t26

    Overall signal efficiency (acceptance times efficiency) per decay as a function of the mean proper lifetime (ctau) of the neutralino...

  • Table 26

    Data from auxiliary Figure 7c

    10.17182/hepdata.90606.v1/t27

    Overall signal efficiency (acceptance times efficiency) per decay as a function of the mean proper lifetime (ctau) of the neutralino...

  • Table 27

    Data from auxiliary Figure 8a

    10.17182/hepdata.90606.v1/t28

    Detection efficiency per decay for Rxy < 22 mm as a function of the invariant mass and pT of the...

  • Table 28

    Data from auxiliary Figure 8b

    10.17182/hepdata.90606.v1/t29

    Detection efficiency per decay for 22 <= Rxy < 38 mm as a function of the invariant mass and pT...

  • Table 29

    Data from auxiliary Figure 8c

    10.17182/hepdata.90606.v1/t30

    Detection efficiency per decay for 38 <= Rxy < 73 mm as a function of the invariant mass and pT...

  • Table 30

    Data from auxiliary Figure 8d

    10.17182/hepdata.90606.v1/t31

    Detection efficiency per decay for 73 <= Rxy < 111 mm as a function of the invariant mass and pT...

  • Table 31

    Data from auxiliary Figure 8e

    10.17182/hepdata.90606.v1/t32

    Detection efficiency per decay for 111 <= Rxy < 145 mm as a function of the invariant mass and pT...

  • Table 32

    Data from auxiliary Figure 8f

    10.17182/hepdata.90606.v1/t33

    Detection efficiency per decay for 145 <= Rxy < 300 mm as a function of the invariant mass and pT...

  • Table 33

    Data from auxiliary Figure 9a

    10.17182/hepdata.90606.v1/t34

    Detection efficiency per decay for Rxy < 22 mm as a function of the invariant mass and pT of the...

  • Table 34

    Data from auxiliary Figure 9b

    10.17182/hepdata.90606.v1/t35

    Detection efficiency per decay for 22 <= Rxy < 38 mm as a function of the invariant mass and pT...

  • Table 35

    Data from auxiliary Figure 9c

    10.17182/hepdata.90606.v1/t36

    Detection efficiency per decay for 38 <= Rxy < 73 mm as a function of the invariant mass and pT...

  • Table 36

    Data from auxiliary Figure 9d

    10.17182/hepdata.90606.v1/t37

    Detection efficiency per decay for 73 <= Rxy < 111 mm as a function of the invariant mass and pT...

  • Table 37

    Data from auxiliary Figure 9e

    10.17182/hepdata.90606.v1/t38

    Detection efficiency per decay for 111 <= Rxy < 145 mm as a function of the invariant mass and pT...

  • Table 38

    Data from auxiliary Figure 9f

    10.17182/hepdata.90606.v1/t39

    Detection efficiency per decay for 145 <= Rxy < 300 mm as a function of the invariant mass and pT...

  • Table 39

    Data from auxiliary Figure 10a

    10.17182/hepdata.90606.v1/t40

    Detection efficiency per decay for Rxy < 22 mm as a function of the invariant mass and pT of the...

  • Table 40

    Data from auxiliary Figure 10b

    10.17182/hepdata.90606.v1/t41

    Detection efficiency per decay for 22 <= Rxy < 38 mm as a function of the invariant mass and pT...

  • Table 41

    Data from auxiliary Figure 10c

    10.17182/hepdata.90606.v1/t42

    Detection efficiency per decay for 38 <= Rxy < 73 mm as a function of the invariant mass and pT...

  • Table 42

    Data from auxiliary Figure 10d

    10.17182/hepdata.90606.v1/t43

    Detection efficiency per decay for 73 <= Rxy < 111 mm as a function of the invariant mass and pT...

  • Table 43

    Data from auxiliary Figure 10e

    10.17182/hepdata.90606.v1/t44

    Detection efficiency per decay for 111 <= Rxy < 145 mm as a function of the invariant mass and pT...

  • Table 44

    Data from auxiliary Figure 10f

    10.17182/hepdata.90606.v1/t45

    Detection efficiency per decay for 145 <= Rxy < 300 mm as a function of the invariant mass and pT...

  • Table 45

    Data from auxiliary Figure 11a

    10.17182/hepdata.90606.v1/t46

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 46

    Data from auxiliary Figure 11b

    10.17182/hepdata.90606.v1/t47

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 47

    Data from auxiliary Figure 11c

    10.17182/hepdata.90606.v1/t48

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 48

    Data from auxiliary Figure 12a

    10.17182/hepdata.90606.v1/t49

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 49

    Data from auxiliary Figure 12b

    10.17182/hepdata.90606.v1/t50

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 50

    Data from auxiliary Figure 12c

    10.17182/hepdata.90606.v1/t51

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 51

    Data from auxiliary Figure 13a

    10.17182/hepdata.90606.v1/t52

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 52

    Data from auxiliary Figure 13b

    10.17182/hepdata.90606.v1/t53

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 53

    Data from auxiliary Figure 13c

    10.17182/hepdata.90606.v1/t54

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 54

    Data from auxiliary Figure 14a

    10.17182/hepdata.90606.v1/t55

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 55

    Data from auxiliary Figure 14b

    10.17182/hepdata.90606.v1/t56

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 56

    Data from auxiliary Figure 14c

    10.17182/hepdata.90606.v1/t57

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 57

    Data from auxiliary Figure 15a

    10.17182/hepdata.90606.v1/t58

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 58

    Data from auxiliary Figure 15b

    10.17182/hepdata.90606.v1/t59

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 59

    Data from auxiliary Figure 15c

    10.17182/hepdata.90606.v1/t60

    Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

  • Table 60

    Data from auxiliary Table 5

    10.17182/hepdata.90606.v1/t61

    Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 100 GeV, three mean proper...

  • Table 61

    Data from auxiliary Table 6

    10.17182/hepdata.90606.v1/t62

    Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 250 GeV, three mean proper...

  • Table 62

    Data from auxiliary Table 7

    10.17182/hepdata.90606.v1/t63

    Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 500 GeV, three mean proper...

  • Table 63

    Data from auxiliary Table 8

    10.17182/hepdata.90606.v1/t64

    Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 750 GeV, three mean proper...

  • Table 64

    Data from auxiliary Table 9

    10.17182/hepdata.90606.v1/t65

    Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 1000 GeV, three mean proper...

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