Strange quark condensate from QCD sum rules to five loops
| dc.creator | Dominguez, C. A. | |
| dc.creator | Nasrallah, N. F. | |
| dc.creator | Schilcher, K. | |
| dc.date | 2007-11-26 | |
| dc.date | 2008-02-08 | |
| dc.date.accessioned | 2026-07-07T12:24:03Z | |
| dc.date.available | 2026-07-07T12:24:03Z | |
| dc.description | It is argued that it is valid to use QCD sum rules to determine the scalar and pseudoscalar two-point functions at zero momentum, which in turn determine the ratio of the strange to non-strange quark condensates $R_{su} = \frac{<\bar{s} s>}{<\bar{q} q>}$ with ($q=u,d$). This is done in the framework of a new set of QCD Finite Energy Sum Rules (FESR) that involve as integration kernel a second degree polynomial, tuned to reduce considerably the systematic uncertainties in the hadronic spectral functions. As a result, the parameters limiting the precision of this determination are $Λ_{QCD}$, and to a major extent the strange quark mass. From the positivity of $R_{su}$ there follows an upper bound on the latter: $\bar{m_{s}} (2 {GeV}) \leq 121 (105) {MeV}$, for $Λ_{QCD} = 330 (420) {MeV} .$ | |
| dc.description | Minor changes to Sections 2 and 6 | |
| dc.identifier | https://arxiv.org/abs/0711.3962 | |
| dc.identifier | http://arxiv.org/abs/0711.3962 | |
| dc.identifier | JHEP 0802:072,2008 | |
| dc.identifier | doi:10.1088/1126-6708/2008/02/072 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/214204 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Strange quark condensate from QCD sum rules to five loops | |
| dc.type | text |