Strong coupling from e+ e- ? hadrons below charm.
BOITO, Diogo Rodrigues; GOLTERMAN, Maarten; KESHAVARZI, Alexander; MALTMAN, Kim; NOMURA, Daisuke; PERIS, Santiago; TEUBNER, Thomas.
BOITO, Diogo Rodrigues; GOLTERMAN, Maarten; KESHAVARZI, Alexander; MALTMAN, Kim; NOMURA, Daisuke; PERIS, Santiago; TEUBNER, Thomas.
 Abstract: We use a new compilation of the hadronic R-ratio from available data for the process eþe- ? hadrons to determine the strong coupling, as. We make use of all data for the R-ratio from threshold to a center-ofmass energy of 2 GeV by employing finite-energy sum rules. Data above 2 GeV, for which at present far fewer high-precision experimental data are available, do not provide much additional constraint but are fully consistent with the values for as we obtain. Quoting our results at the t mass to facilitate comparison to the results obtained from analogous analyses of hadronic t-decay data, we find asðm2t Þ ¼ 0.298 0.016 0.006 in fixed-order perturbation theory, and asðm2t Þ ¼ 0.304 0.018 0.006 in contour-improved perturbation theory, where the first error is statistical, and the second error reflects our estimate of various systematic effects. These values are in good agreement with a recent determination from the OPAL and ALEPH data for hadronic t decays. | |
| Physical Review D |
| v. 98, n. 7, p. 074030-1-074030-19 - Ano: 2018 |
| Fator de Impacto: 4,394 |
| http://dx.doi.org/10.1103/PhysRevD.98.074030 |  @article={002912006,author = {BOITO, Diogo Rodrigues; GOLTERMAN, Maarten; KESHAVARZI, Alexander; MALTMAN, Kim; NOMURA, Daisuke; PERIS, Santiago; TEUBNER, Thomas.},title={Strong coupling from e+ e- ? hadrons below charm},journal={Physical Review D},note={v. 98, n. 7, p. 074030-1-074030-19},year={2018}} |