5 papers
Cooper pairing reexamined
M. Fortes, M. de Llano, M. A. Solis
When both two-electron \textit{and} two-hole Cooper-pairing are treated on an equal footing in the ladder approximation to the Bethe-Salpeter (BS) equation, the zero-total-momentum…
Mirror matter admixtures in K_S to gamma gamma
Gabriel Sanchez-Colon, Augusto Garcia
The latest measurement of the K_S to gamma gamma branching ratio clearly shows an enhancement over the current theoretical prediction. As in other K and B meson decays, this invite…
Mirror matter admixtures in K_L \to γγ
G. Sanchez-Colon, A. Garcia
Based on possible albeit tiny, admixtures of mirror matter in ordinary mesons we study the K_L \to γγtransition. We find that this process can be described with a small SU(3) symme…
A finite-dimensional representation of the quantum angular momentum operator
Rafael G. Campos, L. O. Pimentel, .
A useful finite-dimensional matrix representation of the derivative of periodic functions is obtained by using some elementary facts of trigonometric interpolation. This NxN matrix…
Bose-Einstein Condensation in a Constant Magnetic Field
H. Perez, L. Villegas
We discuss the occurrence of Bose-Einstein condensation in systems of noninteracting charged particles in three in one dimensions and in presence of an external magnetic field. In…