D and rho Mesons: Who resolves whom?

Details D and rho Mesons: Who resolves whom? D and rho Mesons: Who resolves whom?

2001-08-27

arxiv.org/abs/hep-ph/0108223v2

Phys.Lett. B521 (2001) 1-6

Physics

High Energy Physics

High Energy Physics - Phenomenology

1 LaTeX file (9 pages), 2 .ps figures. Accepted for publication to Phys.Letts.B

Scientific paper

10.1016/S0370-2693(01)01192-3

The DDrho form factor is evaluated in a QCD sum rule calculation for both D and rho off-shell mesons. We study the double Borel sum rule for the three point function of two pseudoscalar and one vector meson currents. We find that the momentum dependence of the form factors is very different if the D or the rho meson is off-shell, but they lead to the same coupling constant in the DDrho vertex. We discuss two different approaches to extract the DDrho coupling constant.

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