Chakraborty, Bipasha and Davies, C. T. H. and Galloway, B. and Knecht, P. and Koponen, J. and Donald, G. C. and Dowdall, R. J. and Lepage, G. P. and McNeile, C. (2015) High-precision quark masses and QCD coupling from n(f)=4 lattice QCD. PHYSICAL REVIEW D, 91 (5): 054508. ISSN 1550-7998, 1550-2368
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We present a new lattice QCD analysis of heavy-quark pseudoscalar-pseudoscalar correlators, using gluon configurations from the MILC Collaboration that include vacuum polarization from u, d, s, and c quarks (n(f) = 4). We extract new values for the QCD coupling and for the c quark's (MS) over bar mass: alpha((MS) over bar)(M-Z, n(f) = 5) = 0.11822(74) and m(c)(3 GeV, n(f) = 4) = 0.9851(63) GeV. These agree well with our earlier simulations using n(f) = 3 sea quarks, vindicating the perturbative treatment of c quarks in that analysis. We also obtain a new nonperturbative result for the ratio of c and s quark masses: m(c)/m(s) = 11.652(65). This ratio implies m(s)(2 GeV, n(f) = 3) = 93.6(8) MeV when it is combined with our new c mass. Combining m(c)/m(s) with our earlier m(b)/m(c) gives m(b)/m(s) = 52.55(55), which is several standard deviations (but only 4%) away from the Georgi-Jarlskop prediction from certain grand unified theories. Finally we obtain an n(f) = 4 estimate for m(b)/m(c) = 4.528(54) which agrees well with our earlier n(f) = 3 result. The new ratio implies m(b)(m(b), n(f) = 5) = 4.162(48) GeV.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANOMALOUS DIMENSION; CURRENT CORRELATORS; BETA-FUNCTION; O(ALPHA(3)(S)); VACUUM; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Jul 2019 14:09 |
| Last Modified: | 22 Jul 2019 14:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5780 |
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