A search for bottom-type vector-like quark pair production in dileptonic and fully hadronic final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-B2G-20-014, 2024.

Abstract
A search is described for the production of a pair of bottom-type vector-like quarks (B VLQs) with mass greater than 1000 GeV. Each B VLQ decays into a b quark and a Higgs boson, a b quark and a Z boson, or a t quark and a W boson. This analysis considers both fully hadronic final states and those containing a charged lepton pair from a Z boson decay. The products of the H $to$ bb boson decay and of the hadronic Z or W boson decays can be resolved as two distinct jets or merged into a single jet, so the final states are classified by the number of reconstructed jets. The analysis uses data corresponding to an integrated luminosity of 138 fb$^{-1}$ collected in proton-proton collisions at $\sqrt{s}$ = 13 TeV with the CMS detector at the LHC from 2016 to 2018. No excess over the expected background is observed. Lower limits are set on the B VLQ mass at 95% confidence level. These depend on the B VLQ branching fractions and are 1570 and 1540 GeV for 100% B $\to$ bH and 100% B $\to$ bZ, respectively. In most cases, the mass limits obtained exceed previous limits by at least 100 GeV.

  • Figure 14 Hadronic 4-Jet bHbH

    Data from Figure 14, located on page 28

    10.17182/hepdata.145997.v1/t1

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 14 Hadronic 4-Jet bHbZ

    Data from Figure 14, located on page 28

    10.17182/hepdata.145997.v1/t2

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 14 Hadronic 4-Jet bZbZ

    Data from Figure 14, located on page 28

    10.17182/hepdata.145997.v1/t3

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 15 Hadronic 5-Jet bHbH

    Data from Figure 15, located on page 29

    10.17182/hepdata.145997.v1/t4

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 15 Hadronic 5-Jet bHbZ

    Data from Figure 15, located on page 29

    10.17182/hepdata.145997.v1/t5

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 15 Hadronic 5-Jet bZbZ

    Data from Figure 15, located on page 29

    10.17182/hepdata.145997.v1/t6

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 15 Hadronic 5-Jet bHtW

    Data from Figure 15, located on page 29

    10.17182/hepdata.145997.v1/t7

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 15 Hadronic 5-Jet bZtW

    Data from Figure 15, located on page 29

    10.17182/hepdata.145997.v1/t8

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 16 Hadronic 6-Jet bHbH

    Data from Figure 16, located on page 30

    10.17182/hepdata.145997.v1/t9

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 16 Hadronic 6-Jet bHbZ

    Data from Figure 16, located on page 30

    10.17182/hepdata.145997.v1/t10

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 16 Hadronic 6-Jet bZbZ

    Data from Figure 16, located on page 30

    10.17182/hepdata.145997.v1/t11

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 16 Hadronic 6-Jet bHtW

    Data from Figure 16, located on page 30

    10.17182/hepdata.145997.v1/t12

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 16 Hadronic 6-Jet bZtW

    Data from Figure 16, located on page 30

    10.17182/hepdata.145997.v1/t13

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 17 Semileptonic 3-Jet bHbZ

    Data from Figure 17, located on page 31

    10.17182/hepdata.145997.v1/t14

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 17 Semileptonic 3-Jet bZbZ

    Data from Figure 17, located on page 31

    10.17182/hepdata.145997.v1/t15

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 17 Semileptonic 4-Jet bHbZ

    Data from Figure 17, located on page 31

    10.17182/hepdata.145997.v1/t16

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 17 Semileptonic 4-Jet bZbZ

    Data from Figure 17, located on page 31

    10.17182/hepdata.145997.v1/t17

    Distributions of reconstructed VLQ mass for expected postfit background (blue histogram), signal plus background (colored lines), and observed data (black...

  • Figure 18 0% B$(B \to bH)$, 100% B$(B \to bZ)$

    Data from Figure 18, located on page 33

    10.17182/hepdata.145997.v1/t18

    The limit at 95% CL on the cross section for VLQ pair production for the branching fraction hypothesis 0% $\mathcal{B}(B...

  • Figure 18 25% B$(B \to bH)$, 25% B$(B \to bZ)$

    Data from Figure 18, located on page 33

    10.17182/hepdata.145997.v1/t19

    The limit at 95% CL on the cross section for VLQ pair production for the branching fraction hypothesis 25% $\mathcal{B}(B...

  • Figure 18 50% B$(B \to bH)$, 50% B$(B \to bZ)$

    Data from Figure 18, located on page 33

    10.17182/hepdata.145997.v1/t20

    The limit at 95% CL on the cross section for VLQ pair production for the branching fraction hypothesis 50% $\mathcal{B}(B...

  • Figure 18 100% B$(B \to bH)$, 0% B$(B \to bZ)$

    Data from Figure 18, located on page 33

    10.17182/hepdata.145997.v1/t21

    The limit at 95% CL on the cross section for VLQ pair production for the branching fraction hypothesis 100% $\mathcal{B}(B...

  • Figure 19

    Data from Figure 19, located on page 34

    10.17182/hepdata.145997.v1/t22

    Median expected exclusion limits on the VLQ mass at 95% CL as a function of the branching fractions $\mathcal{B}(B \to...

  • Figure 20

    Data from Figure 20, located on page 35

    10.17182/hepdata.145997.v1/t23

    Median observed exclusion limits on the VLQ mass at 95% CL as a function of the branching fractions $\mathcal{B}(B \to...

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.