M. Benayoun

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}

Study of

A bstractA study of

D_{sJ}

{D^{+}}K_{\mathrm{S}}^0

decays to

and D0K+ final states is performed in a sample of 1.0 fb−1 of pp collision data collected at a centre-of-mass energy of

D^+\KS

\sqrt{s}=7\;\mathrm{TeV}

and

with the LHCb detector. We confirm the existence of the

D^0K^+

D_{s1}^{*}{{\left( {2700} \right)}^{+}}

final states in

and

pp

D_{sJ}^{*}{{\left( {2860} \right)}^{+}}

collisions

excited states and measure their masses and widths to be