10,887 research outputs found

### Supersymmetric Contributions to the B -> phi K Decays in the PQCD Approach

We study the effects of supersymmetric contribution on both the B_d -> phi
K^0 and B^\pm -> phi K^\pm modes using the perturbative QCD approach. We
estimate the deviation of mixing-induced and direct CP asymmetries and discuss
the strong-phase dependence of them.Comment: 4 pages, 2 figures, to appear in the proceedings of the 12th
International Conference on Supersymmetry and Unification of Fundamental
Interactions (SUSY 2004), Tsukuba, Japan, June 17-23, 200

### Study of Penguin Pollution in the B^0 -> J/psi K_S Decay

We study the penguin pollution in the B^0 -> J/psi K_S decay up to leading
power in 1/m_b and to next-to-leading order in \alpha_s, m_b being the b quark
mass and \alpha_s the strong coupling constant. The deviation \Delta S_{J/psi
K_S} of the mixing-induced CP asymmetry from sin(2\phi_1) and the direct CP
asymmetry A_{J/psi K_S} are both found to be of O(10^{-3}) in a formalism that
combines the QCD-improved factorization and perturbative QCD approaches.Comment: 4 pages, 5 figures; talk given at the 4th International Workshop on
the CKM Unitarity Triangle (CKM2006), Nagoya, Japan, Dec. 12-16, 200

### Theoretical status of the B --> pi K decays

We review the theoretical status of the B --> pi K decays, focusing on recent
developments in the QCD factorization and perturbative QCD approaches as well
as on the Standard-Model correlation between the mixing-induced and direct CP
asymmetries of the B^0 --> pi^0 K^0 mode.Comment: 6 pages. Proceedings of CKM2010, the 6th International Workshop on
the CKM Unitarity Triangle, University of Warwick, UK, 6-10 September 2010;
minor changes, references adde

### Recent Developments in the PQCD Approach

We review recent developments in the perturbative QCD approach to exclusive
hadronic B meson decays. We discuss the important next-to-leading-order
corrections to B -> pi K, pi pi, and the penguin-dominated B -> PV modes, where
P (V) is a pseudo-scalar (vector) meson.Comment: 4 pages, 4 figures; talk given at the 4th International Workshop on
the CKM Unitarity Triangle (CKM2006), Nagoya, Japan, Dec. 12-16, 200

### Hadronic B Decays in PQCD

I review recent progress on exclusive hadronic B meson decays in the
perturbative QCD approach, with focus on puzzles in the branching ratios and
the CP asymmetries of the B -> pi K and B -> pi pi modes, and polarization
fractions in B -> VV modes.Comment: Invited talk at Flavor Physics & CP Violation Conference, Vancouver,
2006; 5 pages, 2 figure

### Non-Abelian strategies in quantum penny flip game

In this paper, we formulate and analyze generalizations of the quantum penny
flip game. In the penny flip game, one coin has two states, heads or tails, and
two players apply alternating operations on the coin. In the original Meyer
game, the first player is allowed to use quantum (i.e., non-commutative)
operations, but the second player is still only allowed to use classical (i.e.,
commutative) operations. In our generalized games, both players are allowed to
use non-commutative operations, with the second player being partially
restricted in what operators they use. We show that even if the second player
is allowed to use "phase-variable" operations, which are non-Abelian in
general, the first player still has winning strategies. Furthermore, we show
that even when the second player is allowed to choose one from two or more
elements of the group $U(2)$, the second player has winning strategies under
certain conditions. These results suggest that there is often a method for
restoring the quantum state disturbed by another agent.Comment: 11 pages, 2 figure

### Bound State Effect on the Electron g-2

We evaluate a non-perturbative QED contribution to the electron g-2 which
comes from virtual positronium. We find it to be 9.0*10^{-14}. This value is
comparable to the five-loop contribution of usual perturbative calculation, and
several times larger than the electroweak correction.Comment: 4 pages, 5 figures, 1 tabl

### Non-linear effects for cylindrical gravitational two-soliton

Using a cylindrical soliton solution to the four-dimensional vacuum Einstein
equation, we study non-linear effects of gravitational waves such as Faraday
rotation and time shift phenomenon. In the previous work, we analyzed the
single-soliton solution constructed by the Pomeransky's improved inverse
scattering method. In this work, we construct a new two-soliton solution with
complex conjugate poles, by which we can avoid light-cone singularities
unavoidable in a single soliton case. In particular, we compute amplitudes of
such non-linear gravitational waves and time-dependence of the polarizations.
Furthermore, we consider the time shift phenomenon for soliton waves, which
means that a wave packet can propagate at slower velocity than light.Comment: 13 pages, 8 figure

### Measurement of Squark Flavor Mixings in Supersymmetric Models at Super B Factory

We discuss potential to measure squark flavor mixings based on future data at
super B factory and LHC. In particular we focus on the imaginary part of the
mixings by investigating the CP violating observables. As a result, we find
they are determined with the uncertainty about 10 % at best.Comment: 18 pages, 2 figure

### Construction and application of variations on the cylindrical gravitational waves of Weber, Wheeler, and Bonnor

To clarify certain nonlinear properties of strong gravitational field, we
investigate cylindrically symmetric gravitational waves that are localized as
regular wave packets in the space of radial and time coordinates. The waves are
constructed by applying a certain kind of harmonic mapping method to the seed
solutions with linear polarization, which are generalizations of the solution
representing a cylindrical gravitational pulse wave discussed by Weber-Wheeler
and Bonnor. The solutions obtained here, though their form is rather simple,
show occurrence of strong mutual conversion between a linear mode and a cross
mode apparently. The single localized wave shows the conversion in the vicinity
of the symmetric axis where the self-interaction is strengthened, and the
collision between multiple waves also causes the conversion. These phenomena
can be thought to be the emergence of genuine nonlinearity that the Einstein
gravity holds. Finally we discuss a simple, but interesting application of the
solutions to the case of the Einstein-Maxwell system.Comment: 33 pages, 15 figures, the figures have been displayed, to be
published for Phys.Rev.

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