arXiv subjects

X. Y. Pham

Publications and source records attributed to X. Y. Pham.

20 records · Page 2Linked to original sources

arXiv1994

Failure of the commonly used B -> K(K^) form factors in explaining recent data on B -> J/Ψ+ K ( K^ ) decays

We establish restrictions on $B \ra K ( K^* )$ form factors imposed by recent data on $B \ra J/Ψ+ K ( K^* ) $ decay rates and polarization. We show that these constraints are not satisfied by few commonly used models. Finally, we relate $B \ra K ( K^* )$ form factors to those in $D \ra K ( K^* )$ transitions using the heavy flavour symmetry as proposed by Isgur and Wise and discuss the uncertainties in this procedure. We find that this method also leads to form factors excluded by data.

hep-ph↗

arXiv1993

Possible huge enhancement in the radiative decay of the weal W boson into the charmed $D_{s} $ meson

We point out that the rare decay mode $W^{\pm} \rightarrow γ+ D^{\pm}_{s} $ could be spectacularly enhanced, with a branching ratio around $10^{-6} $ which is three order of magnitude larger than previous predictions. Its observation will determine the W boson mass with great accuracy, providing additional high precision tests of the standard model, as well as reveal eventual deviation from the trilinear non-abelian gauge coupling.

hep-ph↗

X. Y. Pham

Failure of the commonly used B -> K(K^*) form factors in explaining recent data on B -> J/Ψ+ K ( K^* ) decays

Possible huge enhancement in the radiative decay of the weal W boson into the charmed $D_{s} $ meson

Failure of the commonly used B -> K(K^) form factors in explaining recent data on B -> J/Ψ+ K ( K^ ) decays