Where Is the Lightest Charmed Scalar Meson?

The Lightest Strange Scalar Meson ∗

I present the results of a recent calculation to determine the number of strange scalar resonances below 1.8 GeV based on the analytic properties of the experimental πK scattering amplitude. Only one resonance was found in the data, and this is readily identifiable as the K * 0 (1430). We found no evidence to support the κ(900).

The Charmed Strange Meson System

Motivated by the recent surprising discovery of two new meson states with cs̄ quark content but unexpectedly low masses and narrow total decay widths, we work out, in a nonrelativistic potential-model approach developed already some two decades ago, the predictions for the energy levels of the corresponding charm–anti-strange quark bound states. In spite of the fact that this simple quark model ...

qq̄-classification of the lightest scalar mesons

We calculate partial widths for the decays a0(980) → γγ and f0(980) → γγ under the assumption that a0(980) and f0(980) are members of the basic 1 P0qq̄ nonet. The results are in a reasonable agreement with data thus giving an argument for a qq̄ origin of these mesons. We also calculate the γγ partial widths for the other scalar mesons, members of the 2P0qq̄ nonet.

Charmed Meson Scattering from Lattice QCD

Measurement of Charmed Meson Lifetimes with Belle

The lifetimes of charmed mesons have been measured using 2.75 fb of data collected with the Belle detector at KEKB. Each candidate is fully reconstructed to identify the flavor of the charmed meson. The lifetimes are measured to be τ(D) = (414.8±3.8±3.4) fs, τ(D) = (1040 −22 ± 18) fs and τ(D + s ) = (479 +17 −16 +6 −8) fs, where the first error is statistical and the second error is systematic....