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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 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

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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 3d

Data from Figure 3d, 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 3e

Data from Figure 3e, 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 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

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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 6e

Data from Figure 6e, 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 6f

Data from Figure 6f, 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 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

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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 8c

Data from Figure 8c, 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 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...