Overview of the Compete Program

Improvedα4term of the muon anomalous magnetic moment

“…However, its contribution to a µ is of order (m µ /m τ ) 2 ln(m τ /m µ )A (8) 2 (1) ∼ 0.005 so that it may be safely ignored for now. Collecting all results of orders α 4 and α 5 [27] we find a µ (QED) given in (9). In conclusion we have found that the improvement of the α 4 term does not significantly affect the comparison of theory and experiment of a µ .…”

“…The small difference comes from the diagram in which two hadronic vacuum-polarizations are inserted in the second-order vertex diagram. [6] e + e − annihilation 694.8 (8.6) [7] e + e − annihilation 692.4 (5.9) exp (2.4) rad [8] e + e − annihilation 699.6 (8.5) exp (1.9) rad (2.0) proc [9] τ decay 711.0 (5.0) exp (0.8) rad (2.8) SU (2) [6] The contribution of hadronic light-by-light scattering to a µ is more difficult to obtain a reliable value because it cannot utilize any experimental information and must rely solely on theory. After correction of a sign error, it seemed to have settled down to around [10,11,12,13,14,15] a µ (had.l − l) ∼ 80 (40) × 10 −11 .…”

GeV-scale thermal WIMPs: Not even slightly ruled out

“…We use PYTHIA8.2 [67] to generate the energy spectra of stable secondary particles produced by DM annihilation, for the various SM final states. For center of mass energies ∼1-10 GeV (DM masses ∼0.5-5 GeV), there are hadronic resonances that may render the PYTHIA calculations less reliable [67,68]. While we will show PYTHIA-based results in this mass range, we will also present a general argument, independent of the details of the PYTHIA output, that Planck limits exclude the thermal relic cross section over this range (see Sec.…”

Dark spectroscopy at lepton colliders

“…[50,51]. By cutting the photon propagator in the diagram, RðsÞ can be written in terms of the off-shell widths at…”