Upper bounds on $f_D$ and $f_{D_s}$ from two-point correlation function in QCD
| dc.creator | Khodjamirian, Alexander | |
| dc.date | 2008-12-19 | |
| dc.date | 2009-02-11 | |
| dc.date.accessioned | 2026-07-07T12:51:28Z | |
| dc.date.available | 2026-07-07T12:51:28Z | |
| dc.description | The correlation function of two pseudoscalar charmed quark currents with a positive hadronic spectral density is employed to obtain upper bounds on the decay constants of $D$ and $D_s$ mesons. Including all known terms of the operator-product-expansion of this correlation function in QCD and taking into account the estimated uncertainties, we obtain $f_{D}<230 $ MeV and $f_{D_s}<270$ MeV. Comparison with the decay constants determined from $D\to l ν_l$ and $D_s\to l ν_l$ measurements, reveals a tension between the bound and current experimental value of $f_{D_s}$. | |
| dc.description | 8 pages, 3 figures, a few comments,a table and references added, version to appear in Phys.Rev.D | |
| dc.identifier | https://arxiv.org/abs/0812.3747 | |
| dc.identifier | http://arxiv.org/abs/0812.3747 | |
| dc.identifier | Phys.Rev.D79:031503,2009 | |
| dc.identifier | doi:10.1103/PhysRevD.79.031503 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/222996 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Upper bounds on $f_D$ and $f_{D_s}$ from two-point correlation function in QCD | |
| dc.type | text |