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- PETRE DITA
- 2005

The aim of the paper is to make a comparison between the unitarity condition method and the standard version of the unitarity triangle approach by using as parameters four independent moduli |U ij |. This choice is motivated by the measurability property and leads to a simple criterion for the separation of unistochastic matrices from the double stochastic… (More)

- Petre Diţă
- 2002

In this paper we provide an analytical procedure which leads to a system of (n − 2) 2 polynomial equations whose solutions will give the parametriza-tion of the complex n × n Hadamard matrices. The key ingredient is a new factorization of unitary matrices in terms of n diagonal phase matrices in-terlaced with n−1 orthogonal matrices each one generated by a… (More)

- Petre Diţă
- 2008

We show that the motion on the n-dimensional ellipsoid is complete integrable by exihibiting n integrals in involution. The system is separable at classical and quantum level, the separation of classical variables being realized by the inverse of the momentum map. This system is a generic one in a new class of n-dimensional complete integrable Hamiltonians… (More)

- Petre Dita
- Open Syst. Inform. Dynam.
- 2009

A novel method to obtain parameterizations of complex inverse orthogonal matrices is provided. These matrices are natural generalizations of complex Hadamard matrices which depend on non zero complex parameters. The method we use is via doubling the size of inverse complex conference matrices. When the free parameters take values on the unit circle the… (More)

- Petre Diţă
- 1998

We test the positivity property of the chiral perturbation theory (ChPT) pion-pion scattering amplitudes within the Mandelstam triangle. In the one-loop approximation, O(p 4), the positivity constrains only the coefficients b 3 and b 4 , namely one obtains that b 4 and the linear combination b 3 + 3b 4 are positive quantities. The two-loops approximation… (More)

- Petre Diţă
- 2008

By using an exact method to impose unitarity on the neutrino data we show that around the central values of the moduli of the PMNS matrix there is a continuous approximate unitary set of matrices, all of them being consistent with a maximal CP violation in the lepton sector, i.e. δ ≈ 90 • , over a wide range for Ve3 values.

- Petre Diţă
- 2008

We report on an exact method for global fits of the CKM matrix by using the necessary and sufficient conditions the data have to satisfy in order to find a unitary matrix compatible with them, and this method can be applied to both quark and lepton CKM matrices. The key condition writes −1 ≤ cos δ ≤ 1 where δ is the phase that encodes the CP violation, and… (More)

- Petre Diţă
- 1998

We develop here a simple quantisation formalism that make use of Lie algebra properties of the Poisson bracket. When the brackets {H, ϕ i } and {ϕ i , ϕ j }, where H is the Hamiltonian and ϕ i are primary and secondary constraints, can be expressed as functions of H and ϕ i themselves, the Poisson bracket defines a Poisson-Lie structure. When this algebra… (More)

- Petre Diţă
- 2008

We use in this paper an exact method to impose unitarity on moduli of the neutrino PMNS matrix recently determined, and show how one could obtain information on CP non-conservation from a limited experimental information. One suggests a novel type of global fit by expressing all the theoretical quantities in terms of convention independent parameters, the… (More)

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