11,844 research outputs found
U-spin analysis of CP violation in decays into three charged light pseudoscalar mesons
We carry out a -spin symmetry analysis for CP violation in decays
into three light , , and mesons. We clarify some subtle points in constructing decay
amplitudes with formed by the two negatively charged light mesons in the
final states. -spin conserving momentum independent and momentum dependent
decay amplitudes, and -spin violating decay amplitudes due to quark mass
difference are constructed.Comment: RevTex 12 pages wit no figur
The angle as the CP violating phase in the CKM matrix
The CKM matrix describing quark mixing with three generations can be
parameterized by three Euler mixing angles and one CP violating phase. In most
of the parameterizations, the CP violating phase chosen is not a directly
measurable quantity and is parametrization dependent. In this work, we propose
to use the most accurately measured CP violating angle in the unitarity
triangleas the phase in the CKM matrix, and construct an explicit
parameterization. We also derive an approximate Wolfenstein-like expression for
this parameterization.Comment: RevTex 7 pages with one figure. Version to be published in Phys.
Lett. B. arXiv admin note: substantial text overlap with arXiv:1204.123
The , and parameterizations of CP violating CKM phase
The CKM matrix describing quark mixing with three generations can be
parameterized by three mixing angles and one CP violating phase. In most of the
parameterizations, the CP violating phase chosen is not a directly measurable
quantity and is parametrization dependent. In this work, we propose to use
experimentally measurable CP violating quantities, , or
in the unitarity triangle as the phase in the CKM matrix, and
construct explicit , and parameterizations.
Approximate Wolfenstein-like expressions are also suggested.Comment: 14 page, 1 figur
Permanents of Tridiagonal and Hessenberg Matrices Representing Recursive Number and Polynomial Sequences
Sharp Bounds for the Signless Laplacian Spectral Radius in Terms of Clique Number
In this paper, we present a sharp upper and lower bounds for the signless
Laplacian spectral radius of graphs in terms of clique number. Moreover, the
extremal graphs which attain the upper and lower bounds are characterized. In
addition, these results disprove the two conjectures on the signless Laplacian
spectral radius in [P. Hansen and C. Lucas, Bounds and conjectures for the
signless Laplacian index of graphs, Linear Algebra Appl., 432(2010) 3319-3336].Comment: 15 pages 1 figure; linear algebra and its applications 201
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