Drell-Yan Constraints on New Electroweak States: LHC as a $pp\to l^{+}{l}^{-}$ Precision Machine

Abstract

The Standard Model extensions with vector-like states which have either zero hypercharge or zero weak isospin are rather poorly constrained by the electroweak precision measurements. Such new states would however modify the running of the gauge couplings at high energies. As a result, the Drell-Yan process $pp\to l^{+}{l}^{-}$ at the LHC places useful constraints on these models. The relevant observables include both the di-lepton invariant mass distribution $M_{ll}$ and the forward-backward asymmetry $A_{FB}$. We find that the LHC Run 1 data and the initial data from Run 2 surpass the sensitivity of LEP and already put meaningful constraints on the existence of such particles, which will become progressively stronger with more data.

5 pages; v3: matches the version published in Mod. Phys. Lett. A

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• Probing Electroweakly Interacting Massive Particles with Drell-Yan Process at 100 TeV Hadron Colliders
• Indirect Probe of Electroweakly Interacting Particles at the High-Luminosity Large Hadron Collider
• Characterizing dark matter at the LHC in Drell-Yan events
• Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Learning from the New Higgs-like Scalar before It Vanishes
• Probing the weak mixing angle at high energies at the LHC and HL-LHC
• Indirect Studies of Electroweakly Interacting Particles at 100 TeV Hadron Colliders
• Model Independent Constraints on Charges of New Particles