Search for $t$-channel scalar and vector leptoquark exchange in the high-mass dimuon and dielectron spectra in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 12 (2025) 052, 2025.

Abstract (data abstract)
A search for $t$-channel exchange of leptoquarks (LQs) is performed using proton-proton collision data collected at $\sqrt{s}=13$ TeV with the CMS detector at the CERN LHC. The data correspond to an integrated luminosity of $138\text{ fb}^{-1}$. Eight scenarios are considered, in which nonresonant scalar or vector LQs couple up or down quarks to electrons or muons, for dilepton invariant masses above $500$ GeV. LQ masses are probed up to $5$ TeV, heavier than those probed by previous pair-production and single-production searches. The differential distributions of dilepton events are fit to templates constructed from simulated standard model events that are reweighted to the form of the Drell-Yan cross section with LQ exchange. Limits are set on LQ-fermion coupling strengths for various LQ masses at $95\%$ confidence level (CL). For scalar LQs with masses in the $1-5$ TeV range, coupling values greater than $0.3-1.0$ $(0.4-1.3)$ are excluded for LQs coupled to an electron/muon and an up (down) quark. For vector LQs, coupling values greater than $0.1-0.5$ $(0.3-1.4)$ are excluded for LQs coupled to an electron/muon and an up (down) quark.

  • Figure 3

    Data from Figure 3

    10.17182/hepdata.156848.v2/t1

    The observed data in the dielectron channel and the fitted signal-plus-background templates, shown for the $S_{e u}$ scenario with a...

  • Figure 11 (left)

    Data from Figure 11 (left)

    10.17182/hepdata.156848.v2/t2

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|y_{e u}|$, versus $S_{e u}$ mass for scalar LQs coupled to...

  • Figure 4

    Data from Figure 4

    10.17182/hepdata.156848.v2/t3

    The observed data in the dielectron channel and the fitted signal-plus-background templates, shown for the $S_{e d}$ scenario with a...

  • Figure 11 (right)

    Data from Figure 11 (right)

    10.17182/hepdata.156848.v2/t4

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|y_{e d}|$, versus $S_{e d}$ mass for scalar LQs coupled to...

  • Figure 5

    Data from Figure 5

    10.17182/hepdata.156848.v2/t5

    The observed data in the dimuon channel and the fitted signal-plus-background templates, shown for the $S_{\mu u}$ scenario with a...

  • Figure 12 (left)

    Data from Figure 12 (left)

    10.17182/hepdata.156848.v2/t6

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|y_{\mu u}|$, versus $S_{\mu u}$ mass for scalar LQs coupled to...

  • Figure 6

    Data from Figure 6

    10.17182/hepdata.156848.v2/t7

    The observed data in the dimuon channel and the fitted signal-plus-background templates, shown for the $S_{\mu d}$ scenario with a...

  • Figure 12 (right)

    Data from Figure 12 (right)

    10.17182/hepdata.156848.v2/t8

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|y_{\mu d}|$, versus $S_{\mu d}$ mass for scalar LQs coupled to...

  • Figure 7

    Data from Figure 7

    10.17182/hepdata.156848.v2/t9

    The observed data in the dielectron channel and the fitted signal-plus-background templates, shown for the $V_{e u}$ scenario with a...

  • Figure 13 (left)

    Data from Figure 13 (left)

    10.17182/hepdata.156848.v2/t10

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|g_{e u}|$, versus $V_{e u}$ mass for vector LQs coupled to...

  • Figure 8

    Data from Figure 8

    10.17182/hepdata.156848.v2/t11

    The observed data in the dielectron channel and the fitted signal-plus-background templates, shown for the $V_{e d}$ scenario with a...

  • Figure 13 (right)

    Data from Figure 13 (right)

    10.17182/hepdata.156848.v2/t12

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|g_{e d}|$, versus $V_{e d}$ mass for vector LQs coupled to...

  • Figure 9

    Data from Figure 9

    10.17182/hepdata.156848.v2/t13

    The observed data in the dimuon channel and the fitted signal-plus-background templates, shown for the $V_{\mu u}$ scenario with a...

  • Figure 14 (left)

    Data from Figure 14 (left)

    10.17182/hepdata.156848.v2/t14

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|g_{\mu u}|$, versus $V_{\mu u}$ mass for vector LQs coupled to...

  • Figure 10

    Data from Figure 10

    10.17182/hepdata.156848.v2/t15

    The observed data in the dimuon channel and the fitted signal-plus-background templates, shown for the $V_{\mu d}$ scenario with a...

  • Figure 14 (right)

    Data from Figure 14 (right)

    10.17182/hepdata.156848.v2/t16

    Upper limits at $95\%$ CL on the LQ-fermion couplings, $|g_{\mu d}|$, versus $V_{\mu d}$ mass for vector LQs coupled to...

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