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dc.contributor.authorChakraborty, Ben
dc.contributor.authorDavies, CTHen
dc.contributor.authorDonald, GCen
dc.contributor.authorDowdall, RJen
dc.contributor.authorGalloway, Ben
dc.contributor.authorKnecht, Pen
dc.contributor.authorKoponen, Jen
dc.contributor.authorLepage, GPen
dc.contributor.authorMcNeile, Cen
dc.date.accessioned2019-09-01T16:21:13Z
dc.date.available2019-09-01T16:21:13Z
dc.identifier.urihttp://hdl.handle.net/10026.1/14836
dc.description16 pages, 9 figures, 6 tablesen
dc.description.abstract

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 $\overline{\mathrm{MS}}$ mass: $\alpha_{\overline{\mathrm{MS}}}(M_Z,n_f=5) = 0.11822(74)$ and $m_c(3\mathrm{GeV}, n_f=4) = 0.9851(63)$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 $m_s(2\,\mathrm{GeV}, n_f=3)=93.6(8)$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 GUTs. 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.

en
dc.format.extent054508 - ?en
dc.language.isoenen
dc.subjecthep-laten
dc.subjecthep-laten
dc.titleHigh-precision quark masses and QCD coupling from $n_f=4$ lattice QCDen
dc.typeJournal Article
plymouth.author-urlhttp://arxiv.org/abs/1408.4169v3en
plymouth.volume91en
plymouth.publisher-urlhttp://dx.doi.org/10.1103/PhysRevD.91.054508en
plymouth.journalPhys. Rev. Den
dc.identifier.doi10.1103/PhysRevD.91.054508en
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/00 Groups by role
plymouth.organisational-group/Plymouth/00 Groups by role/Academics
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Engineering, Computing and Mathematics
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA10 Mathematical Sciences
dc.rights.embargoperiodNot knownen
rioxxterms.versionofrecord10.1103/PhysRevD.91.054508en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.typeJournal Article/Reviewen


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