Search for a third-generation leptoquark coupled to a $\tau$ lepton and a b quark through single, pair, and nonresonant production in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 05 (2024) 311, 2024.

Abstract (data abstract)
A search is presented for a third-generation leptoquark (LQ) coupled exclusively to a $\tau$ lepton and a b quark. The search is based on proton-proton collision data at a center-of-mass energy of $\sqrt{s}=13\,\mathrm{TeV}$ recorded with the CMS detector, corresponding to an integrated luminosity of $138\,\mathrm{fb}^{-1}$. Events with $\tau$ leptons and a varying number of jets originating from b quarks are considered, targeting the single and pair production of LQs, as well as nonresonant $t$-channel LQ exchange. An excess is observed in the data with respect to the background expectation in the combined analysis of all search regions. For a benchmark LQ mass of 2 TeV and a coupling strength of 2.5, the excess reaches local significances of up to 2.8 standard deviations. Upper limits at the $95\%$ confidence level are placed on the LQ production cross section in the LQ mass range 0.5-2.3 TeV, and up to 3 TeV for $t$-channel LQ exchange. Leptoquarks are excluded below masses of 1.22-1.88 TeV for different LQ models and varying coupling strengths up to 2.5. Considering only LQ exchange in the $t$ channel, constraints are placed on LQs with masses and coupling strengths of up to 3 TeV and 3.5, respectively.

  • Figure 2: Vector LQ efficiency, 1j

    Data from Figure 2, located on page 7.

    10.17182/hepdata.141707.v1/t1

    Product of acceptance and efficiency of a vector LQ signal as a function of LQ mass under the assumption of...

  • Figure 2: Vector LQ efficiency, 0j

    Data from Figure 2, located on page 7.

    10.17182/hepdata.141707.v1/t2

    Product of acceptance and efficiency of a vector LQ signal as a function of LQ mass under the assumption of...

  • Figure 3a: STMET, emu, 1b

    Data from Figure 3a, located on page 13.

    10.17182/hepdata.141707.v1/t3

    Postfit distributions of $S_\mathrm{T}^\mathrm{MET}$ in the $\mathrm{e}\mu$ channel of the 0b category for the combined 2016-2018 data set after a...

  • Figure 3b: STMET, emu, 1b

    Data from Figure 3b, located on page 13.

    10.17182/hepdata.141707.v1/t4

    Postfit distributions of $S_\mathrm{T}^\mathrm{MET}$ in the $\mathrm{e}\mu$ channel of the $\geq$1b category for the combined 2016-2018 data set after a...

  • Figure 3c: STMET, ltau, 1b

    Data from Figure 3c, located on page 13.

    10.17182/hepdata.141707.v1/t5

    Postfit distributions of $S_\mathrm{T}^\mathrm{MET}$ in the $\ell\tau_\mathrm{h}$ channel of the 0b category for the combined 2016-2018 data set after a...

  • Figure 3d: STMET, ltau, 1b

    Data from Figure 3d, located on page 13.

    10.17182/hepdata.141707.v1/t6

    Postfit distributions of $S_\mathrm{T}^\mathrm{MET}$ in the $\ell\tau_\mathrm{h}$ channel of the $\geq$1b category for the combined 2016-2018 data set after a...

  • Figure 3e: STMET, tautau, 1b

    Data from Figure 3e, located on page 13.

    10.17182/hepdata.141707.v1/t7

    Postfit distributions of $S_\mathrm{T}^\mathrm{MET}$ in the $\tau_\mathrm{h}\tau_\mathrm{h}$ channel of the 0b category for the combined 2016-2018 data set after a...

  • Figure 3f: STMET, tautau, 1b

    Data from Figure 3f, located on page 13.

    10.17182/hepdata.141707.v1/t8

    Postfit distributions of $S_\mathrm{T}^\mathrm{MET}$ in the $\tau_\mathrm{h}\tau_\mathrm{h}$ channel of the $\geq$1b category for the combined 2016-2018 data set after a...

  • Figure 4a: chi, emu, 0j

    Data from Figure 4a, located on page 14.

    10.17182/hepdata.141707.v1/t9

    Postfit distributions of $\chi$ in the $\mathrm{e}\mu$ channel of the 0j, $400 < m_\mathrm{vis} < 600\,\mathrm{GeV}$ category for the combined...

  • Figure 4b: chi, emu, 0j

    Data from Figure 4b, located on page 14.

    10.17182/hepdata.141707.v1/t10

    Postfit distributions of $\chi$ in the $\mathrm{e}\mu$ channel of the 0j, $m_\mathrm{vis} > 600\,\mathrm{GeV}$ category for the combined 2016-2018 data...

  • Figure 4c: chi, ltau, 0j

    Data from Figure 4c, located on page 14.

    10.17182/hepdata.141707.v1/t11

    Postfit distributions of $\chi$ in the $\ell\tau_\mathrm{h}$ channel of the 0j, $400 < m_\mathrm{vis} < 600\,\mathrm{GeV}$ category for the combined...

  • Figure 4d: chi, ltau, 0j

    Data from Figure 4d, located on page 14.

    10.17182/hepdata.141707.v1/t12

    Postfit distributions of $\chi$ in the $\ell\tau_\mathrm{h}$ channel of the 0j, $m_\mathrm{vis} > 600\,\mathrm{GeV}$ category for the combined 2016-2018 data...

  • Figure 4e: chi, tautau, 0j

    Data from Figure 4e, located on page 14.

    10.17182/hepdata.141707.v1/t13

    Postfit distributions of $\chi$ in the $\tau_\mathrm{h}\tau_\mathrm{h}$ channel of the 0j, $400 < m_\mathrm{vis} < 600\,\mathrm{GeV}$ category for the combined...

  • Figure 4f: chi, tautau, 0j

    Data from Figure 4f, located on page 14.

    10.17182/hepdata.141707.v1/t14

    Postfit distributions of $\chi$ in the $\tau_\mathrm{h}\tau_\mathrm{h}$ channel of the 0j, $m_\mathrm{vis} > 600\,\mathrm{GeV}$ category for the combined 2016-2018 data...

  • Figure 5: Cross section limits

    Data from Figure 5, located on page 18.

    10.17182/hepdata.141707.v1/t15

    Exclusion limits on the total cross section of a scalar LQ as a function of LQ mass under the assumption...

  • Figure 6: Cross section limits

    Data from Figure 6, located on page 18.

    10.17182/hepdata.141707.v1/t16

    Exclusion limits on the total cross section of a vector LQ as a function of LQ mass under the assumption...

  • Figure 7: 2D limits

    Data from Figure 7, located on page 19.

    10.17182/hepdata.141707.v1/t17

    Exclusion limits on the mass of a scalar LQ as a function of the coupling strength $\lambda$ under the assumption...

  • Figure 8: 2D limits

    Data from Figure 8, located on page 19.

    10.17182/hepdata.141707.v1/t18

    Exclusion limits on the mass of a vector LQ as a function of the coupling strength $\lambda$ under the assumption...

  • Figure 9a: 2D limits (nonres.)

    Data from Figure 9a, located on page 20.

    10.17182/hepdata.141707.v1/t19

    Exclusion limits on the coupling strength $\lambda$ of a scalar LQ as a function of the LQ mass under the...

  • Figure 9b: 2D limits (nonres.)

    Data from Figure 9b, located on page 20.

    10.17182/hepdata.141707.v1/t20

    Exclusion limits on the coupling strength $\lambda$ of a vector LQ as a function of the LQ mass under the...

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