Heath Bland O'Connell

Radiative decays, nonet symmetry, and SU(3) breaking

We reexamine the problem of simultaneously describing in a consistent way all radiative and leptonic decays of light mesons (V{r_arrow}P{gamma}, P{r_arrow}V{gamma}, P{r_arrow}{gamma}{gamma}, V{r_arrow}e{sup +}e{sup {minus}}). For this purpose, we rely on the hidden local symmetry model in both its anomalous and non-anomalous sectors. We show that the SU(3) symmetry breaking scheme proposed by Bando, Kugo and Yamawaki, supplemented with nonet symmetry breaking in the pseudoscalar sector, allows one to reach a nice agreement with all data, except for the K{sup {asterisk}{plus_minus}} radiative decay. An extension of this breaking pattern allows one to account for this particular decay mode too. Considered together, the whole set of radiative decays provides a pseudoscalar mixing angle {theta}{sub P}{approx_equal}{minus}11{degree} and a value for {theta}{sub V} which is {approx_equal}3{degree} from that of ideal mixing. We also show that it is impossible, in a practical sense, to disentangle the effects of nonet symmetry breaking and those of glue inside the {eta}{sup {prime}}, using only light meson decays. {copyright} {ital 1999} {ital The American Physical Society}

SU(3) breaking and hidden local symmetry

We study the various existing implementations of SU(3) breaking in the hidden local symmetry model for the low energy hadronic sector following a mechanism originally proposed by Bando, Kugo and Yamawaki (BKY). We pay particular attention to Hermiticity and current conservation. Following this, we present a new method for including symmetry breaking effects which preserves the BKY mass relation among vector mesons. Symmetry breaking (SB) necessarily requires a transformation of the pseudoscalar fields, which, following BKY, we refer to as field renormalization. We examine the consequences of propagating this through all Lagrangian terms including the anomalous ones. We thus explore the consequences of these various SB schemes for both charged and neutral pseudoscalar decay constants as measured in weak and anomalous decays respectively. {copyright} {ital 1998} {ital The American Physical Society}

Rho-Omega Mixing and Direct CP Violation in Hadronic B-Decays

The extraction of CKM-matrix-element information from hadronic B-decays generally suffers from discrete ambiguities, hampering the diagnosis of physics beyond the Standard Model. We show that a measurement of the rate asymmetry, which is CP-violating, in

Vector meson dominance and the {rho} meson

B^{\pm}\to\rho^{\pm}\rho^0(\omega)\to\rho^{\pm}\pi^+\pi^-

Extracting the r-w mixing amplitude form the pion form-factor

, where the invariant mass of the

ρ-ω mixing and direct CP violation in hadronic B decays

\pi^+\pi^-

Extracting Br(omega->pi^+ pi^-) from the Time-like Pion Form-factor

pair is in the vicinity of the

ON EXTRACTING THE RHO -OMEGA MIXING AMPLITUDE FROM THE PION FORM-FACTOR

\omega

{ital {rho}} -{ital {omega}} Mixing and Direct {ital CP} Violation in Hadronic {ital B} Decays

resonance, can remove the mod(

Extracting Br (

\pi