Beyond the Narrow Resonance Approximation: Decay Constant and Width of the First Pion-Excitation State

Details Beyond the Narrow Resonance Approximation: Decay Constant and Width of the First Pion-Excitation State Beyond the Narrow Resonance Approximation: Decay Constant and Width of the First Pion-Excitation State

1997-06-23

arxiv.org/abs/hep-ph/9706472v1

Phys.Lett. B412 (1997) 131-136

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, revtex, no figures, accepted for publication in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)01049-6

We consider the first pion excitation as a sub-continuum resonance in the pseudoscalar channel, and we obtain parameters characterizing this resonance through a global fit of the Borel-parameter dependence of the field-theoretical pseudoscalar Laplace sum rule to its hadronic (pion + pion-excitation + QCD-continuum) content. Our analysis incorporates finite-width deviations from the narrow resonance approximation, instanton effects, and higher-loop perturbative contributions to the pseudoscalar correlator. We obtain the following values (uncertainties reflect 90% confidence levels): mass $M_\Pi = 1.15 \pm 0.28 GeV$, width $\Gamma_\Pi = < 0.48 GeV$, decay constant $r \equiv [F_\Pi M_\Pi^2 / f_\pi m_\pi^2]^2 = 4.7 \pm 2.8$.

Affiliated with

Also associated with

No associations

Rating

Beyond the Narrow Resonance Approximation: Decay Constant and Width of the First Pion-Excitation State does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Beyond the Narrow Resonance Approximation: Decay Constant and Width of the First Pion-Excitation State, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Beyond the Narrow Resonance Approximation: Decay Constant and Width of the First Pion-Excitation State will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-149264