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Search for single production of a vector-like T quark decaying to a top quark and a Z boson in the final state with jets and missing transverse momentum at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-B2G-19-004, 2022.

Abstract (data abstract)
A search is presented for single production of a vector-like T quark with charge $2e/3$, in the decay channel featuring a top quark and a Z boson, with the top quark decaying hadronically and the Z boson decaying to neutrinos. The search uses data collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 136 $\mathrm{fb}^{-1}$ recorded at the CERN LHC in 2016--2018. The search is sensitive to a T quark mass between 0.6 and 1.8 TeV with decay widths ranging from negligibly small up to 30$\%$ of the T quark mass. Reconstruction strategies for the top quark are based on the degree of Lorentz boosting of its final state. At 95$\%$ confidence level, the upper limit on the product of the cross section and branching fraction for a T quark of small decay width varies between 15 and 602 $\mathrm{fb}$, depending on its mass. For a T quark with decay widths between 10 and 30$\%$ of its mass, this upper limit ranges between 16 and 836 $\mathrm{fb}$. For most of the studied range, the results provide the best limits to date. This is the first search for single T quark production based on the full Run 2 data set of the LHC.

  • Figure 2a

    Data from Figure 2a, located on page 7

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    Product of efficiency and acceptance of the event selection for T signal events as a function of the particle mass...

  • Figure 2b

    Data from Figure 2b, located on page 7

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    Product of efficiency and acceptance of the event selection for T signal events as a function of the particle mass...

  • Figure 2c

    Data from Figure 2c, located on page 7

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    Product of efficiency and acceptance of the event selection for T signal events as a function of the particle mass...

  • Figure 2d

    Data from Figure 2d, located on page 7

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    Product of efficiency and acceptance of the event selection for T signal events as a function of the particle mass...

  • Figure 2e

    Data from Figure 2e, located on page 7

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    Product of efficiency and acceptance of the event selection for T signal events as a function of the particle mass...

  • Figure 2f

    Data from Figure 2f, located on page 7

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    Product of efficiency and acceptance of the event selection for T signal events as a function of the particle mass...

  • Figure 3a

    Data from Figure 3a, located on page 9

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged validation...

  • Figure 3b

    Data from Figure 3b, located on page 9

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged validation...

  • Figure 3c

    Data from Figure 3c, located on page 9

    10.17182/hepdata.100426.v1/t9

    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged validation...

  • Figure 3d

    Data from Figure 3d, located on page 9

    10.17182/hepdata.100426.v1/t10

    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged validation...

  • Figure 3e

    Data from Figure 3e, located on page 9

    10.17182/hepdata.100426.v1/t11

    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged validation...

  • Figure 3f

    Data from Figure 3f, located on page 9

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged validation...

  • Figure 4a

    Data from Figure 4a, located on page 10

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved validation...

  • Figure 4b

    Data from Figure 4b, located on page 10

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved validation...

  • Figure 4c

    Data from Figure 4c, located on page 10

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved validation...

  • Figure 4d

    Data from Figure 4d, located on page 10

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved validation...

  • Figure 4e

    Data from Figure 4e, located on page 10

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved validation...

  • Figure 4f

    Data from Figure 4f, located on page 10

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved validation...

  • Figure 5a

    Data from Figure 5a, located on page 12

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged region...

  • Figure 5b

    Data from Figure 5b, located on page 12

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged region...

  • Figure 5c

    Data from Figure 5c, located on page 12

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged region...

  • Figure 5d

    Data from Figure 5d, located on page 12

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged region...

  • Figure 5e

    Data from Figure 5e, located on page 12

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged region...

  • Figure 5f

    Data from Figure 5f, located on page 12

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the merged region...

  • Figure 6a

    Data from Figure 6a, located on page 13

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the partially merged...

  • Figure 6b

    Data from Figure 6b, located on page 13

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the partially merged...

  • Figure 6c

    Data from Figure 6c, located on page 13

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the partially merged...

  • Figure 6d

    Data from Figure 6d, located on page 13

    10.17182/hepdata.100426.v1/t28

    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the partially merged...

  • Figure 6e

    Data from Figure 6e, located on page 13

    10.17182/hepdata.100426.v1/t29

    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the partially merged...

  • Figure 6f

    Data from Figure 6f, located on page 13

    10.17182/hepdata.100426.v1/t30

    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the partially merged...

  • Figure 7a

    Data from Figure 7a, located on page 14

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved region...

  • Figure 7b

    Data from Figure 7b, located on page 14

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved region...

  • Figure 7c

    Data from Figure 7c, located on page 14

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved region...

  • Figure 7d

    Data from Figure 7d, located on page 14

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved region...

  • Figure 7e

    Data from Figure 7e, located on page 14

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved region...

  • Figure 7f

    Data from Figure 7f, located on page 14

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    Distribution of the transverse mass $M_T$ reconstructed from the top quark and the missing transverse energy in the resolved region...

  • Figure 8a

    Data from Figure 8a, located on page 15

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    Observed and expected 95% CL upper limits on the product of the cross section and branching fraction of a T...

  • Figure 8b

    Data from Figure 8b, located on page 15

    10.17182/hepdata.100426.v1/t38

    Observed and expected 95% CL upper limits on the product of the cross section and branching fraction of a T...

  • Figure 8c

    Data from Figure 8c, located on page 15

    10.17182/hepdata.100426.v1/t39

    Observed and expected 95% CL upper limits on the product of the cross section and branching fraction of a T...

  • Figure 8d

    Data from Figure 8d, located on page 15

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    Observed and expected 95% CL upper limits on the product of the cross section and branching fraction of a T...

  • Figure 9 Observed CLs

    Data from Figure 9, located on page 16

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    Model independent observed 95% CL upper limits on the product of the cross section and branching fraction of a T...

  • Figure 9 Exclusion limit

    Data from Figure 9, located on page 16

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    Singlet model 95% CL excluded values of the product of the cross section and branching fraction for a T decaying...

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