Anticipating Non-Resonant New Physics in Dilepton Angular Spectra at the LHC

Abstract

At the LHC, dileptonic events may turn up new physics interacting with quarks and leptons. The poster child for this scenario is a resonant $Z^{\prime }$, much anticipated in ${\ell }^{+}{\ell }^{-}$ invariant mass spectra. However, angular spectra of dileptons may play an equal or stronger role in discovering a non-resonant species. This paper avails of their LHC measurements to corner the couplings and masses of leptoquarks (LQs), that can mediate $q\bar{q}\to {\ell }^{+}{\ell }^{-}$ in the $t$-channel and dramatically alter Standard Model angular spectra. Also derived are constraints from alterations to $m_{\ell \ell }$ distributions. These dilepton probes, exploiting the high rates and small uncertainties of the Drell-Yan process, rival or outdo dedicated LHC searches for LQs in single and pair production modes. The couplings of LQs with electronic interactions are best bound today by low-energy measurements of atomic parity violation, but can be probed better by ${\ell }^{+}{\ell }^{-}$ measurements in the high luminosity runs of the LHC, with the angular spectra leading the way. This work also advocates the experimental presentation of boost-invariant angular asymmetries that vanish in the SM.

20 pages, 10 figures

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• Parton distributions in the SMEFT from high-energy Drell-Yan tails
• Precision Probes of QCD at High Energies
• Precise limits on the charge-$2/3$ $U_1$ vector leptoquark
• Resonant third-generation leptoquark signatures at the Large Hadron Collider
• Adding Flavor to the SMEFT
• New Physics in $b\to s\mu \mu$: FCC-hh or a Muon Collider?
• On Drell-Yan production of scalar leptoquarks coupling to heavy-quark flavours
• Fresh look at the LHC limits on scalar leptoquarks
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• Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Asymmetric Leptoquark Pair Production at LHC
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• 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
• Searching for exclusive leptoquarks with the Nambu-Jona-Lasinio composite model at the LHC and HL-LHC
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• Constraining scalars of $16_H$ through proton decays in non-renormalisable $SO(10)$ models
• Exploring mixed lepton-quark interactions in non-resonant leptoquark production at the LHC