3,662 research outputs found
Localized direct CP violation in
We study the localized direct CP violation in the hadronic decays
,
including the effect caused by an interesting mechanism involving the charge
symmetry violating mixing between and . We calculate the
localized integrated direct CP violation when the low invariant mass of
[] is near . For five models of
form factors investigated, we find that the localized integrated direct CP
violation varies from -0.0170 to -0.0860 in the ranges of parameters in our
model when \,GeV. This result, especially the
sign, agrees with the experimental data and is independent of form factor
models. The new experimental data shows that the signs of the localized
integrated CP asymmetries in the regions \,GeV
and \,GeV are positive and negative,
respectively. We find that - mixing makes the localized
integrated CP asymmetry move towards the negative direction, and therefore
contributes to the sign change in those two regions. This behavior is also
model independent. We also calculate the localized integrated direct CP
violating asymmetries in the regions \,GeV and
\,GeV and find that they agree with the
experimental data in some models of form factors.Comment: 22 pages, 2 figures. arXiv admin note: text overlap with
arXiv:hep-ph/0602043, arXiv:hep-ph/0302156 by other author
Possible large violation in three body decays of heavy baryon
We propose a new mechanism which can introduce large asymmetries in the
phase spaces of three-body decays of heavy baryons. In this mechanism, a large
asymmetry is induced by the interference of two intermediate resonances,
which subsequently decay into two different combinations of final particles. We
apply this mechanism to the decay channel , and
find that the differential asymmetry can reach as large as , while
the regional asymmetry can reach as large as in the interference
region of the phase space.Comment: 7 pages, 2 figures, 2nd version accepted by Phys. Lett.
Non-classical properties and algebraic characteristics of negative binomial states in quantized radiation fields
We study the nonclassical properties and algebraic characteristics of the
negative binomial states introduced by Barnett recently. The ladder operator
formalism and displacement operator formalism of the negative binomial states
are found and the algebra involved turns out to be the SU(1,1) Lie algebra via
the generalized Holstein-Primarkoff realization. These states are essentially
Peremolov's SU(1,1) coherent states. We reveal their connection with the
geometric states and find that they are excited geometric states. As
intermediate states, they interpolate between the number states and geometric
states. We also point out that they can be recognized as the nonlinear coherent
states. Their nonclassical properties, such as sub-Poissonian distribution and
squeezing effect are discussed. The quasiprobability distributions in phase
space, namely the Q and Wigner functions, are studied in detail. We also
propose two methods of generation of the negative binomial states.Comment: 17 pages, 5 figures, Accepted in EPJ
Majorana neutrino signals at Belle-II and ILC
For some theoretical and experimental considerations, the relatively light
Majorana neutrinos at the GeV scale have been attracting some interest. In this
article we consider a scenario with only one Majorana neutrino , negligible
mixing with the active neutrinos , where the Majorana neutrino
interactions could be described in a model independent approach based on an
effective theory. Under such a framework, we particularly study the feasibility
of observing the with mass in the range 030 GeV via the process e^+ e^-
\to \nu N \to\gamma + \slashed E in the future Belle-II and ILC experiments.
The results show that it is unpromising for Belle-II to observe the signal,
while ILC may easily make a discovery for the Majorana neutrino.Comment: 14 pages, 7 figures, 2 table
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