--- title: "The ηc → pp Decay and a Quark-Diquark Model of the Nucleon: the Contribution of Scalar-Vector Diquark Transition • CBPF Index" description: "CBPF INDEX es el sistema de seguimiento de la producción científica y tecnológica del CBPF. En él se puede obtener la lista de publicaciones de artículos, libros, informes técnicos, etc. de toda la comunidad del CBPF." canonical_url: "https://index.cbpf.br/es/publicacoes/6ad2a767639f62b11adbb681" locale: es meta: "og:description": "CBPF INDEX es el sistema de seguimiento de la producción científica y tecnológica del CBPF. En él se puede obtener la lista de publicaciones de artículos, libros, informes técnicos, etc. de toda la comunidad del CBPF." "og:image": "https://index.cbpf.br/_og/d/c_Item%2Ctitulo_~VGhlIDxtYXRoPs63YzwvbWF0aD4gPG1hdGg-4oaSPC9tYXRoPiA8bWF0aD4gcHA8L21hdGg-IERlY2F5IGFuZCBhIFF1YXJrLURpcXVhcmsgTW9kZWwgb2YgdGhlIE51Y2xlb246IHRoZSBDb250cmlidXRpb24gb2YgU2NhbGFyLVZlY3RvciBEaXF1YXJrIFRyYW5zaXRpb24%2Ctipo_~Tm90YSBkZSBGw61zaWNh%2Ccor_~I2E4MmMwMA%2Cautores_~TS4gQW5zZWxtaW5vOyBGLiBDYXJ1c287IFPDqXJnaW8gSm9mZmlseTsgSm9zw6kgU29hcmVz%2Cdetalhe_1991%2Csecao_Publicaciones%2Cp_Ii9lcy9wdWJsaWNhY29lcy82YWQyYTc2NzYzOWY2MmIxMWFkYmI2ODEi%2Cs_1bdzJ8lf3vZPHzj-.png" "og:image:height": "600" "og:image:type": image/png "og:image:width": "1200" "og:title": "The ηc → pp Decay and a Quark-Diquark Model of the Nucleon: the Contribution of Scalar-Vector Diquark Transition • CBPF Index" "twitter:image": "https://index.cbpf.br/_og/d/c_Item%2Ctitulo_~VGhlIDxtYXRoPs63YzwvbWF0aD4gPG1hdGg-4oaSPC9tYXRoPiA8bWF0aD4gcHA8L21hdGg-IERlY2F5IGFuZCBhIFF1YXJrLURpcXVhcmsgTW9kZWwgb2YgdGhlIE51Y2xlb246IHRoZSBDb250cmlidXRpb24gb2YgU2NhbGFyLVZlY3RvciBEaXF1YXJrIFRyYW5zaXRpb24%2Ctipo_~Tm90YSBkZSBGw61zaWNh%2Ccor_~I2E4MmMwMA%2Cautores_~TS4gQW5zZWxtaW5vOyBGLiBDYXJ1c287IFPDqXJnaW8gSm9mZmlseTsgSm9zw6kgU29hcmVz%2Cdetalhe_1991%2Csecao_Publicaciones%2Cp_Ii9lcy9wdWJsaWNhY29lcy82YWQyYTc2NzYzOWY2MmIxMWFkYmI2ODEi%2Cs_1bdzJ8lf3vZPHzj-.png" --- > Index of every page on this site: [llms.txt](https://index.cbpf.br/llms.txt) **Nota de Física****Publicado** # **The **ηc\\\eta\_c\ηc​** **→\\\rightarrow\→** **ppˉ\ p\\bar{p}\ppˉ​** Decay and a Quark-Diquark Model of the Nucleon: the Contribution of Scalar-Vector Diquark Transition** **M. Anselmino; F. Caruso; Sérgio Joffily; José Soares** 1991 [**Descargar PDF **0,3 MB](https://index.cbpf.br/files/publicacao/6ad2a767639f62b11adbb681/pdf) [**Contactar al responsable**](mailto:apub@cbpf.br?subject=The%20%3Cmath%3E%CE%B7c%3C%2Fmath%3E%20%3Cmath%3E%E2%86%92%3C%2Fmath%3E%20%3Cmath%3E%20pp%3C%2Fmath%3E%20Decay%20and%20a%20Quark-Diquark%20Model%20of%20the%20Nucleon%3A%20the%20Contribution%20of%20Scalar-Vector%20Diquark%20Transition) ## **Datos de la publicación**
Autores
M. Anselmino; F. Caruso; Sérgio Joffily; José Soares
Tipo
Nota de Física
Estado
Publicado
Fecha de publicación
1991
Descripción
The <math>\eta_c\,\!</math> decay into proton-antiproton cannot be explained by a lowest order perturbative QCD quark scheme. Trying to improve a previous result where diquarks were also considered as nucleon's constituents, the contribution of the spin-flip transition between scalar and vector diquarks inside the nucleon is computed and is shown to be strictly zero. This result excludes the possibility of understanding why this decay is experimentally observed with a branching ratio much greater than those of other charmonium decays into the same final state, <math>\chi 0,1,2\,\!</math> <math> \rightarrow p\bar{p}\,\!</math>, successfully described by <math> p QCD\,\!</math> in terms of quark and diquark components of the protons. A theoretical explanation of this decay rate is then still lacking and it is suggested that pseudoscalar glueballs might play an important role in solving the puzzle. The experimental results are also briefly discussed.
Año
1991
Número
CBPF-NF-017/91
Vínculo con tesis
No
Vínculo con beca
No
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