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http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3638| Title: | Form-factors and current correlators: chiral couplings L_10(mu) and C_87(mu) at NLO in 1/N(C) |
| Keywords: | QCD Chiral Lagrangians 1/N Expansion |
| Publisher: | Institute of Physics Publishing |
| Description: | 50 páginas, 3 figuras, 5 tablas.-- arXiv:0803.1567v1 Using the resonance chiral theory Lagrangian, we perform a calculation of the vector and axial-vector two-point functions at the next-to-leading order (NLO) in the 1/N(C) expansion. We have analyzed these correlators within the single-resonance approximation and have also investigated the corrections induced by a second multiplet of vector and axial-vector resonance states. Imposing the correct QCD short-distance constraints, one determines the difference of the two correlators Pi(t) = Pi_VV(t)- Pi_AA(t) in terms of the pion decay constant and resonance masses. Its low momentum expansion fixes then the low-energy chiral couplings L_10 and C_87 at NLO, keeping full control of their renormalization scale dependence. At mu_0=0.77 GeV, we obtain L_10(mu_0) = (-4.4 \pm 0.9)10^{-3} and C_87^r(mu_0)=(3.1 \pm 1.1)10^{-5}. This work has been supported by the Spanish Ministry of Education, under grants FPA2007-60323 and CSD2007-00042 (Consolider Project CPAN), and by the EU MRTN-CT-2006-035482 (FLAVIAnet). Peer reviewed |
| URI: | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3638 |
| Other Identifiers: | Journal of High Energy Physics 07: 014 (2008) http://hdl.handle.net/10261/3638 10.1088/1126-6708/2008/07/014 |
| Appears in Collections: | Digital Csic |
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