28 citations · 170 across the 22 of their papers we have counts for
22 papers
Glueball Physics in QCD
Y. M. Cho, X. Y. Pham, Pengming Zhang +2
The Abelian decomposition of QCD which decomposes the gluons to the color neutral binding gluons and the colored valence gluons shows that QCD can be viewed as the restricted QCD (…
Chiral anomaly, triangle loop and the the form factor
T. N. Pham, X. Y. Pham
The recent BaBar measurements of the form factor show spectacular deviation from perturbative QCD computations for large space-like . At …
Chiral Anomaly Effects and the BaBar Measurements of the Transition Form Factor
T. N. Pham, X. Y. Pham
The recent BaBar measurements of the transition form factor show spectacular deviation from perturbative QCD prediction for large space-like up to $34\,\r…
On the B Decay
Xuan Son Nguyen, Xuan-Yem Pham
We calculate the process- and polarization-dependent nonfactorizable terms of the B J decay within the QCD-impro…
Superheavy Majorana neutrino effects in the lepton-number violating e- + e- -> mu- + mu- process
X. Y. Pham
In the minimal extension of the standard electroweak theory with ultra massive Majorana neutrinos, the process e- + e- -> mu- + mu- could be observable, in sharp contrast with the…
One-loop flavor changing electromagnetic transitions
Q. Ho-Kim, X. Y. Pham
We discuss the effect of the external fermion masses in the flavor-changing radiative transitions of a heavy fermion (quark or lepton) to a lighter fermion at the one-loop level, a…
CP Asymmetries in B_d \to D^{*+}D^{*-} and B_s \to D^{*+}_s D^{*-}_s Decays: P-wave Dilution, Penguin and Rescattering Effects
Xuan-Yem Pham, Zhi-zhong Xing
Determination of the CP-violating parameters \sin 2βand \sin 2β' is shown to be possible from B^0_d vs \bar{B}^0_d \to D^{*+}D^{*-} and B^0_s vs \bar{B}^0_s \to D^{*+}_sD^{*-}_s de…
Massive Neutrino Decays
X. Y. Pham
Neutrino physics is used as an illustrative example for an elementary introduction to the computational method of Feynman loop-diagrams and decay rates. If the neutrinos are as mas…
The decays "neutrino{heavy} -> neutrino{light} + photon" and "neutrino{heavy} -> neutrino{light} e+ e-" of massive neutrinos
Q. Ho-Kim, B. Machet, X. Y. Pham
If, as recently reported by the Super-Kamiokande collaboration, the neutrinos are massive, the heaviest one would not be stable and, though chargeless, could in particular decay in…
Lepton flavor changing in neutrinoless decays
X. Y. Pham
Neutrino oscillations, as recently reported by the Super-Kamiokande collaboration, imply that lepton numbers could be violated, and $τ^{\pm}\to μ^{\pm}+\ell^{+}+\ell^{-},τ^{\pm}\to…
Is the lepton flavour changing observable in decay?
X. Y. Pham
Neutrino oscillations as suggested by the recent Super-Kamiokande result imply that lepton numbers could be violated, and Z is a typical manifestation. We poi…
A new CP violation mechanism generated by the standard neutral Higgs boson : the case
X. Y. Pham, M. Gourdin
Strictly within the standard electro-weak interaction, CP violation in the flavour conserving process could originate from the mixing of the meson with the…
CP violation in by Higgs - mixing through two-loop quantum effects
X. Y. Pham
Strictly within the standard electro-weak interaction, CP violation in the flavour conserving process $η\ra π+ π$ could originate from the mixing of the meson with the virtual…
A MODEL FOR THE CHARMED MESON DECAYS INTO THREE PIONS
M. GOURDIN, Y. Y. KEUM, X. Y. PHAM
We propose a phenomenological three component model describing the decay amplitude of the process $D_{s}^{+} \ra 3π$. The first component is a constant background, the second one i…
A Model for the decay of the meson into three pions,
M. Gourdin, Y. Y. Keum, X. Y. Pham
We propose a phenomenological two component model describing the decay amplitude of the process $D_s^{+} \ra 3 π$, whose rate has been found surprisingly large. The first component…
SU(2) HEAVY FLAVOUR SYMMETRY FOR B -> K(K^*) HADRONIC FORM FACTORS
M. Gourdin, Y. Y. Keum, X. Y. Pham
We show that the factorization assumption in colour-suppressed meson decays is not ruled out by experimental data on $B \ra K(K^*) + J/Ψ(Ψ^{'})$. The problem previously pointed…
Factorization and SU(2) Heavy Flavor Symmetry for B-Meson Decays Producing Charmonium
M. Gourdin, Y. Y. Keum, X. Y. Pham
We show that the factorization assumption in color-suppressed meson decays is not ruled out by experimental data on $B \ra K(K^*) + J/Ψ(Ψ^{'})$. The problem previously pointed…
Testing factorization in colour-suppressed beauty decays with the B -> η_c + K(K^*) modes
M. Gourdin, Y. Y. Keum, X. Y. Pham
The large discrepancy recently observed between $B \ra J/Ψ+ K (K^*)$ data and commonly used hadronic form factor models might be due to a breakdown of the factorization assumption.…
Implications of factorization for the determination of hadronic form factors in $D_s^+ \ra ϕ$ transition
M. Gourdin, A. N. Kamal, Y. Y. Keum +1
Using factorization we determine the allowed domains of the ratios of form factors, and , from the experimentally measured ratio $R_h \equiv Γ(…
On the Determination of and from Hadronic Two Body Decays
M. Gourdin, A. M Kamal, Y. Y. Keum +1
{}From Class I decays : $B^o \ra π^+ ( ρ^+ ) + D^- ( {D^*}^- )$, we determine , and from Class III decays : $B^+ \ra π^+ ( ρ^+ ) + \ol{D}^o ( {\ol{D}^*}^o )$, we determine an…
Failure of the commonly used B -> K(K^*) form factors in explaining recent data on B -> J/Ψ+ K ( K^* ) decays
M. Gourdin, A. N. Kamal, X. Y. Pham
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 s…
Possible huge enhancement in the radiative decay of the weal W boson into the charmed meson
Y. Y. Keum, X. Y. Pham
We point out that the rare decay mode could be spectacularly enhanced, with a branching ratio around which is three order of magnit…