Configuration mixing and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>K</mml:mi></mml:math> -forbidden <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>E</mml:mi><mml:mn>2</mml:mn></mml:mrow></mml:math> decays

Perturbative QCD forbidden charmonium decays and gluonia.

We address the problem of observed charmonium decays which should be forbidden in perturbative QCD. We examine the model in which these decays proceed through a gluonic component of the J/Ψ and the ηc, arising from a mixing of (cc̄) and glueball states. We give some bounds on the values of the mixing angles and propose the study of the pp̄ → φφ reaction, at √s ≃ 3 GeV, as an independent test of t...

Rare and Forbidden Decays of D Mesons

D. A. Sanders, E. M. Aitala, S. Amato, J. C. Anjos, J. A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S. B. Bracker, P. R. Burchat, R. A. Burnstein, T. Carter, H. S. Carvalho, N. K. Copty, L. M. Cremaldi, C. Darling, K. Denisenko, S. Devmal, A. Fernandez, G. F. Fox, P. Gagnon, C. Gobel, K. Gounder, A. M. Halling, G. Herrera, G. Hurvits, C. James, P. A. Kasper, S. Kwan, D. C. Langs, ...

Bs Decays and Mixing

Mixing and Rare Decays

Current status of charm mixing search, lifetime difference measurement and rare decay search are reported. The best upper limit at 95% CL for mixing is reported from the CLEO collaboration. E791 has reported lifetime difference measurement and results of rare decay searches. Rare decay searches of the FOCUS collaboration are in progress and their sensitivities to branching ratios are at the lev...

A Survey of Forbidden Configuration Results

Let F be a k×` (0,1)-matrix. We say a (0,1)-matrix A has F as a configuration if there is a submatrix of A which is a row and column permutation of F . In the language of sets, a configuration is a trace and in the language of hypergraphs a configuration is a subhypergraph. Let F be a given k × ` (0,1)-matrix. We define a matrix to be simple if it is a (0,1)-matrix with no repeated columns. The...