Search for Z' bosons decaying to pairs of heavy Majorana neutrinos in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 11 (2023) 181, 2023.

Abstract (data abstract)
A search for pair production of heavy Majorana neutrinos (N) from the decays of Z' bosons is performed using the CMS detector at the LHC. The data were collected in proton-proton collisions at a center-of-mass energy of $\sqrt{s}$ = 13 TeV, with an integrated luminosity of $138 fb^{-1}$. The signature for the search is two same-flavor leptons (e or $\mu$) and at least two jets. No significant excess of events beyond the expected background is observed. Upper limits at 95\% confidence level are set on the product of cross section and branching fraction for the pair production of ${N}_{l}$, as functions of ${N}_{l}$ and Z' boson masses (${m}_{N}$ and ${m}_{Z'}$, respectively) for ${m}_{Z'}$ from $0.4$ to 4.4 TeV and ${m}_{N}$ from 0.1 TeV to ${m}_{Z'}/2$. In the theoretical framework of a left-right symmetric model, exclusion bounds on the ${m}_{N}$-${m}_{Z'}$ plane are presented in both the electron and muon channels. The observed upper limit on ${m}_{Z'}$ reaches up to 4.42 TeV.

  • Figure_002_Upper_left

    Data from Figure_002

    10.17182/hepdata.141323.v1/t1

    Reconstructed mass of the Z' candidate in CR1, which consists of flavor sidebands of SR1 (upper), SR2 (middle), and SR3...

  • Figure_002_Upper_right

    Data from Figure_002

    10.17182/hepdata.141323.v1/t2

    Reconstructed mass of the Z' candidate in CR1, which consists of flavor sidebands of SR1 (upper), SR2 (middle), and SR3...

  • Figure_002_Middle_left

    Data from Figure_002

    10.17182/hepdata.141323.v1/t3

    Reconstructed mass of the Z' candidate in CR1, which consists of flavor sidebands of SR1 (upper), SR2 (middle), and SR3...

  • Figure_002_Middle_right

    Data from Figure_002

    10.17182/hepdata.141323.v1/t4

    Reconstructed mass of the Z' candidate in CR1, which consists of flavor sidebands of SR1 (upper), SR2 (middle), and SR3...

  • Figure_002_Lower_left

    Data from Figure_002

    10.17182/hepdata.141323.v1/t5

    Reconstructed mass of the Z' candidate in CR1, which consists of flavor sidebands of SR1 (upper), SR2 (middle), and SR3...

  • Figure_002_Lower_right

    Data from Figure_002

    10.17182/hepdata.141323.v1/t6

    Reconstructed mass of the Z' candidate in CR1, which consists of flavor sidebands of SR1 (upper), SR2 (middle), and SR3...

  • Figure_003_Upper_left

    Data from Figure_003

    10.17182/hepdata.141323.v1/t7

    Reconstructed mass of the Z' candidate in CR2, which consists of the dilepton mass sidebands of SR1 (upper), SR2 (middle),...

  • Figure_003_Upper_right

    Data from Figure_003

    10.17182/hepdata.141323.v1/t8

    Reconstructed mass of the Z' candidate in CR2, which consists of the dilepton mass sidebands of SR1 (upper), SR2 (middle),...

  • Figure_003_Middle_left

    Data from Figure_003

    10.17182/hepdata.141323.v1/t9

    Reconstructed mass of the Z' candidate in CR2, which consists of the dilepton mass sidebands of SR1 (upper), SR2 (middle),...

  • Figure_003_Middle_right

    Data from Figure_003

    10.17182/hepdata.141323.v1/t10

    Reconstructed mass of the Z' candidate in CR2, which consists of the dilepton mass sidebands of SR1 (upper), SR2 (middle),...

  • Figure_003_Lower_left

    Data from Figure_003

    10.17182/hepdata.141323.v1/t11

    Reconstructed mass of the Z' candidate in CR2, which consists of the dilepton mass sidebands of SR1 (upper), SR2 (middle),...

  • Figure_003_Lower_right

    Data from Figure_003

    10.17182/hepdata.141323.v1/t12

    Reconstructed mass of the Z' candidate in CR2, which consists of the dilepton mass sidebands of SR1 (upper), SR2 (middle),...

  • Figure_004_Upper_left

    Data from Figure_004

    10.17182/hepdata.141323.v1/t13

    Distributions of the reconstructed Z' candidate mass in SR1 (upper row), SR2 (middle row) and SR3 (lower row). Left (right)...

  • Figure_004_Upper_right

    Data from Figure_004

    10.17182/hepdata.141323.v1/t14

    Distributions of the reconstructed Z' candidate mass in SR1 (upper row), SR2 (middle row) and SR3 (lower row). Left (right)...

  • Figure_004_Middle_left

    Data from Figure_004

    10.17182/hepdata.141323.v1/t15

    Distributions of the reconstructed Z' candidate mass in SR1 (upper row), SR2 (middle row) and SR3 (lower row). Left (right)...

  • Figure_004_Middle_right

    Data from Figure_004

    10.17182/hepdata.141323.v1/t16

    Distributions of the reconstructed Z' candidate mass in SR1 (upper row), SR2 (middle row) and SR3 (lower row). Left (right)...

  • Figure_004_Lower_left

    Data from Figure_004

    10.17182/hepdata.141323.v1/t17

    Distributions of the reconstructed Z' candidate mass in SR1 (upper row), SR2 (middle row) and SR3 (lower row). Left (right)...

  • Figure_004_Lower_right

    Data from Figure_004

    10.17182/hepdata.141323.v1/t18

    Distributions of the reconstructed Z' candidate mass in SR1 (upper row), SR2 (middle row) and SR3 (lower row). Left (right)...

  • Figure_005_Upper_left

    Data from Figure_005

    10.17182/hepdata.141323.v1/t19

    The observed and expected 95\% CL upper limits on the product of \Zp boson cross section times branching fraction are...

  • Figure_005_Upper_right

    Data from Figure_005

    10.17182/hepdata.141323.v1/t20

    The observed and expected 95\% CL upper limits on the product of \Zp boson cross section times branching fraction are...

  • Figure_005_Lower_left

    Data from Figure_005

    10.17182/hepdata.141323.v1/t21

    The observed and expected 95\% CL upper limits on the product of \Zp boson cross section times branching fraction are...

  • Figure_005_Lower_right

    Data from Figure_005

    10.17182/hepdata.141323.v1/t22

    The observed and expected 95\% CL upper limits on the product of \Zp boson cross section times branching fraction are...

  • Figure_006_Left

    Data from Figure_006

    10.17182/hepdata.141323.v1/t23

    Observed and expected exclusion regions at 95% CL in the 2D phase space of ${m}_{Z'}$ vs. ${m}_{N}$ for dielectron (left)...

  • Figure_006_Right

    Data from Figure_006

    10.17182/hepdata.141323.v1/t24

    Observed and expected exclusion regions at 95% CL in the 2D phase space of ${m}_{Z'}$ vs. ${m}_{N}$ for dielectron (left)...

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