Hadrons in a nonperturbative continuum approach to QCD beyond rainbows and ladders
Charmed hadrons at the confinement scale: structure and interactions with matter
| Full text | |
| Author(s): |
Boito, Diogo
[1]
;
Golterman, Maarten
[2, 3, 4]
;
Keshavarzi, Alexander
[5, 6]
;
Maltman, Kim
[7, 8]
;
Nomura, Daisuke
[9]
;
Peris, Santiago
[2, 4]
;
Teubner, Thomas
[6]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13570970 Sao Carlos, SP - Brazil
[2] Univ Autonoma Barcelona, Dept Phys, E-08193 Barcelona - Spain
[3] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 - USA
[4] Univ Autonoma Barcelona, IFAE BIST, E-08193 Barcelona - Spain
[5] Univ Mississippi, University, MS 38677 - USA
[6] Univ Liverpool, Dept Math Sci, Liverpool L69 3BX, Merseyside - England
[7] Univ Adelaide, CSSM, Adelaide, SA 5005 - Australia
[8] York Univ, Dept Math & Stat, Toronto, ON M3J 1P3 - Canada
[9] KEK Theory Ctr, Tsukuba, Ibaraki 3050801 - Japan
Total Affiliations: 9
|
| Document type: | Journal article |
| Source: | Physical Review D; v. 98, n. 7 OCT 31 2018. |
| Web of Science Citations: | 2 |
| Abstract | |
We use a new compilation of the hadronic R-ratio from available data for the process e(+)e(-) -> hadrons to determine the strong coupling, as. We make use of all data for the R-ratio from threshold to a center-of-mass 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 tau-decay data, we find alpha(s)(m(tau)(2)) = 0.298 +/- 0.016 +/- 0.006 in fixed-order perturbation theory, and alpha(s)(m(tau)(2)) = 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 tau decays. (AU) | |
| FAPESP's process: | 15/20689-9 - Precise determination of fundamental QCD parameters |
| Grantee: | Diogo Rodrigues Boito |
| Support Opportunities: | Research Grants - Young Investigators Grants |