1994/10/07 by E. W. N. Glover, E.W.N. Glover, M. R. Sutton +1 · 4 citations
Engineering · Materials Science · Physics and Astronomy · #Atomic and Molecular Physics #Electron and X-Ray Spectroscopy Techniques #Muon and positron interactions and applications #hep-ph
paper · pdf · doi:10.1016/0370-2693(94)01354-f
published as Phys.Lett.B342:375-380,1995 · 10 pages, 2 figs in uuencoded PS, LaTex using tables.tex appended at end of file, DTP/94/80, LaTex reformed
arxiv created 1994/10/07 · openalex publication_date 1995/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
The \cal O(αs2) coefficient of the energy-energy correlation function (EEC) has been calculated by four groups with differing results. This discrepancy has lead to some confusion over how to measure the strong coupling constant using the EEC and the asymmetry of the energy-energy correlation function (AEEC) in electron-positron annihilation at the Z resonance. For example, SLD average the four values of αs extracted from each of the different calculations. To resolve this situation, we present a new calculation of this coefficient using three separate numerical techniques to cancel the infrared poles. All three methods agree with each other and confirm the results of Kunszt and Nason that form the benchmark for other \cal O(αs2) quantities. As a consequence, the central values and theoretical errors of the strong coupling constant derived by SLD from the EEC and AEEC are altered. Using the SLD data, we find, αsEEC(MZ2) = 0.125+0.002-0.003~(\rm exp.) ± 0.012 ~(\rm theory) and αsAEEC(MZ2) = 0.114± 0.005~(\rm exp.) ± 0.004 ~(\rm theory).