2022/02/04 by David d’Enterria, D. d’Enterria, David d'Enterria +2 · 4 citations
Physics and Astronomy · #Computer science #Crystallography and Radiation Phenomena #Electron #Fusion #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Lepton #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Philosophy #Photon #Physics #Production (economics) #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #State (computer science) #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · open access · doi:10.1103/physrevd.105.093008
published in CERN Document Server (European Organization for Nuclear Research) 105(9) (European Organization for Nuclear Research) · 8 pages, 5 figures. Minor corrections. Matches published version
openalex publication_date 2022/02/04 · openalex created_date 2022/05/05 · arxiv created 2022/05/24 · arxiv updated 2022/05/25 · openalex updated_date 2026/06/22
The feasibility of observing true tauonium, the bound state of two tau leptons, T0≡(τ+τ-)0, via photon-photon collisions at e+e- colliders and at the LHC, is studied. The production cross sections of the process γγ\toT0→γγ -- as well as those of all relevant backgrounds: spin-0 and 2 charmonium resonances decaying to diphotons, and light-by-light scattering -- are computed in the equivalent photon approximation for e+e- collisions at BES III (√(s) = 3.8 GeV), Belle II (√(s) = 10.6 GeV), and FCC-ee (√(s) = 91.2 GeV), as well as for ultraperipheral p-p, p-Pb, and Pb-Pb collisions at the LHC. Despite small T0 production cross sections and a final state swamped by decays from overlapping pseudoscalar and tensor charmonium states -- the \mathrmχc2, \mathrmηc(2S), and \mathrmχc0 states have masses only 2.5, 84, and 139 MeV away, respectively, from the T0 peak -- evidence and observation of the ground state of the heaviest leptonium appears feasible at Belle II and FCC-ee, respectively, with in-situ high-precision measurements of the irreducible backgrounds.