Exotic Lepton Searches via Bound State Production at the LHC

Abstract

Heavy long-lived multi-charged leptons (MCLs) are predicted by various new physics models. These hypothetical MCLs can form bound states, due to their high electric charges and long life times. In this work, we propose a novel strategy of searching for MCLs through their bound state productions and decays. By utilizing LHC-8 TeV data in searching for resonances in the diphoton channel, we exclude the masses of isospin singlet heavy leptons with electric charge $|q|\ge 6$ (in units of electron charge) lower than $\sim$1.2 TeV, which are much stronger than the corresponding 8 TeV LHC bounds from analysing the high ionisation and the long time-of-flight of MCLs. By utilising the current 13 TeV LHC diphoton channel measurements the bound can further exclude MCL masses up to $\sim$1.6 TeV for $|q|\ge 6$. Also, we demonstrate that the conventional LHC limits from searching for MCLs produced via Drell-Yan processes can be enhanced by including the contribution of photon fusion processes.

9 pages, 3 figures, Updated to match PLB

References in corpus (6)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The global electroweak fit at NNLO and prospects for the LHC and ILC
• Stable Massive Particles at Colliders
• Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
• Large N flavor beta-functions: a recap
• QED and ortho-para- positronium mass difference

Cited by in corpus (7)

• Discovery prospects for long-lived multiply charged particles at the LHC
• Complementarity for Dark Sector Bound States
• Lepton Number Violation: Seesaw Models and Their Collider Tests
• Bounds and Prospects for Stable Multiply Charged Particles at the LHC
• The Two Scales of New Physics in Higgs Couplings
• Searching for Monopoles via Monopolium Multiphoton Decays
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos