Chiral corrections to the f_V^T/f_V ratio for vector mesons

Abstract

In this letter we compute the leading chiral corrections to the ratio between the tensor and the vector decay couplings for the lowest lying vector meson multiplet (rho, K^*, phi). We show that the leading chiral logarithms arise from tadpole contributions and are therefore entirely fixed by chiral symmetry, while the next to leading corrections are purely analytic. Interestingly, the flavour structure of the chiral logarithms implies that only the rho meson is sensitive to pion logarithms. By examining SU(2)_L\times SU(2)_R\times U(1)_S theories we show that this result can be easily understood and that it holds to all orders in the m_s expansion. Recent lattice data seem to comply with our results.

16 pages, 2 figures

References in corpus (6)

• B->V gamma Beyond QCD Factorisation
• Form Factors in the radiative pion decay
• Meson masses and decay constants from unquenched lattice QCD
• Novel patterns for vector mesons from the large-Nc limit
• Lattice Results for Vector Meson Couplings and Parton Distribution Amplitudes
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Cited by in corpus (6)

• Constraints on scalar leptoquarks from lepton and kaon physics
• The $\rho$-meson light-cone distribution amplitudes from lattice QCD
• Nucleon matrix elements of the antisymmetric quark tensor
• CP asymmetry in $\tau \to K_S\pi {\nu }_{\tau }$ decays within the Standard Model and beyond
• Computation of the $p^6$ order low-energy constants with tensor sources
• K* vector and tensor couplings from Nf = 2 tmQCD