33,868 research outputs found
Implications from recent measurements on sin 2\beta and muon g-2
The recent data on CP asymmetry in and muon g-2 are discussed
in the framework of standard model and beyond. Possible new phase effects
besides the CKM phase are discussed in the processes concerning CP violation in
B decays and muon anomalous magnetic moment (muon g-2). It is found that the
new phases will result in difference between angles measured from
and the one from global fit. The ration between them serves as
a probe of not only new physics but also new phase besides the CKM phase In the
case of muon g-2, the new phase may change the interferences between various
contributions. By including the new phases, some cancelations in the real
coupling cases can be avoided and the large value of muon g-2 observed in the
recent measurements can be understood.Comment: 7 pages, no figure. Talk delivered by Y.F.Zhou at International
Conference on Flavor Physics (ICFP2001), May 31-June.6, at Zhang-Jia-Jie,
Chin
Isospin relation and SU(3) breaking effects of strong phases in Charmless B decays
Isospin and flavor SU(3) relations in charmless hadronic B decays are investigated in detail with paying attention to the SU(3)
symmetry breaking effects in both amplitudes and strong phases. In general, the
isospin and the flavor SU(3) structure of the effective Hamiltonian provide
several relations among the amplitudes and strong phases. Whereas a global fit
to the latest data shows that some relation seems not to be favorable for a
consistent explanation to the current data within the standard model (SM). By
considering several patterns of SU(3) breaking, the amplitudes and the
corresponding strong phases are extracted and compared with the theoretical
estimations. It is found that in the case of SU(3) limits and also the case
with SU(3) breaking only in amplitudes, the fitting results lead to an
unexpected large ratio between two isospin amplitudes
, which is about an order of magnitude larger than the
SM prediction. The results are found to be insensitive to the weak phase
. By including SU(3) breaking effects on the strong phases, one is able
to obtain a consistent fit to the current data within the SM, which implies
that the SU(3) breaking effect on strong phases may play an important role in
understanding the observed charmless hadronic B decay modes and
. It is possible to test those breaking effects in the near future from
more precise measurements of direct CP violation in B factories.Comment: 14 pages, revtex4, no figure, references added. Updated to the latest
data. To appear in Euro. Phys. Journ.
Holographic QCD with Topologically Charged Domain-Wall/Membranes
We study the thermodynamical phase structures of holographic QCD with
nontrivial topologically charged domain-wall/membranes which are originally
related to the multiple -vacua in the large limit. We realize the
topologically charged membranes as the holographic D6-brane fluxes in the
Sakai-Sugimoto model. The D6-brane fluxes couple to the probe D8-anti-D8 via
Chern-Simon term, and act as the source for the baryonic current density of
QCD. We find rich phase structures of the dual meson system by varying
asymptotic separation of D8 and anti-D8. Especially, there can be a
thermodynamically favored and stable phase of finite baryonic current density.
This provides the supporting evidence for the discovery of the topologically
charged membranes found in the lattice QCD calculations. We also find a
crossover phase with the limiting baryonic current density and temperature
which suggest a Hagedorn-like phase transition of meson dissociation.Comment: 23 pages, 19 figures;v2 typos corrected;v3 text improve
- …