Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 07 (2023) 161, 2023.

Abstract (data abstract)
A search for pairs of dijet resonances with the same mass is conducted in final states with at least four jets. Results are presented separately for the case where the four jet production proceeds via an intermediate resonant state and for nonresonant production. The search uses a data sample corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$ collected by the CMS detector in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$. Model-independent limits, at 95$\%$ confidence level, are reported on the production cross section of four-jet and dijet resonances. These first LHC limits on resonant pair production of dijet resonances via high mass intermediate states are applied to a signal model of diquarks that decay into pairs of vector-like quarks, excluding diquark masses below $7.6~\mathrm{TeV}$ for a particular model scenario. There are two events in the tails of the distributions, each with a four-jet mass of $8~\mathrm{TeV}$ and an average dijet mass of $2~\mathrm{TeV}$, resulting in local and global significances of 3.9 and 1.6 standard deviations, respectively, if interpreted as a signal. The nonresonant search excludes pair production of top squarks with masses between 0.50 $\mathrm{TeV}$ and 0.77 $\mathrm{TeV}$, with the exception of a small interval between 0.52 and 0.58 $\mathrm{TeV}$, for supersymmetric R-parity-violating decays to quark pairs, significantly extending previous limits. Here, the most significant excess above the predicted background occurs at an average dijet mass of 0.95 $\mathrm{TeV}$, for which the local and global significances are 3.6 and 2.5 standard deviations, respectively.

  • Cross-section limits - $M(X)/M(Y) = 0.11$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t1

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.13$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t2

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.15$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t3

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.17$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t4

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.19$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t5

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.21$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t6

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.23$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t7

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.25$

    Data from Figure 11.

    10.17182/hepdata.130817.v1/t8

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.27$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t9

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.29$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t10

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.31$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t11

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.33$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t12

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - $M(X)/M(Y) = 0.42$

    Data from Figure 10.

    10.17182/hepdata.130817.v1/t13

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for resonant production...

  • Cross-section limits - non resonant scenario

    Data from Figure 12.

    10.17182/hepdata.130817.v1/t14

    The observed 95% CL upper limits on the product of the cross section, branching fraction, and acceptance for the non-resonant...

  • Differential four-jet mass spectrum - 0.22 < $\\a$ < 0.24

    Data from Figure 7.

    10.17182/hepdata.130817.v1/t15

    Observed differential four-jet mass spectrum for 0.22 < $\\a$ < 0.24. The cross-section is calculated by dividing the event yield...

  • Differential four-jet mass spectrum - 0.24 < $\\a$ < 0.26

    Data from Figure 7.

    10.17182/hepdata.130817.v1/t16

    Observed differential four-jet mass spectrum for 0.24 < $\\a$ < 0.26. The cross-section is calculated by dividing the event yield...

  • Differential four-jet mass spectrum - 0.26 < $\\a$ < 0.28

    Data from Figure 7.

    10.17182/hepdata.130817.v1/t17

    Observed differential four-jet mass spectrum for 0.26 < $\\a$ < 0.28. The cross-section is calculated by dividing the event yield...

  • Differential four-jet mass spectrum - inclusive

    Data from Figure 15.

    10.17182/hepdata.130817.v1/t18

    Observed differential four-jet mass spectrum for all $\\a$ bins together. The cross-section is calculated by dividing the event yield by...

  • Differential average dijet mass spectrum

    Data from Figure 9.

    10.17182/hepdata.130817.v1/t19

    Observed differential average dijet mass spectrum within three $\\a$ bins of the non-resonant search. The cross-section is calculated by dividing...

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