dorsal/arxiv
View SchemaRadiative proton-antiproton annihilation and isospin mixing in protonium
| Authors | T. Gutsche, R. Vinh Mau, M. Strohmeier-Presicek, A. Faessler |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9811039 |
| URL | https://arxiv.org/abs/nucl-th/9811039 |
| DOI | 10.1103/PhysRevC.59.630 |
| Journal | Phys.Rev. C59 (1999) 630-641 |
Abstract
A detailed analysis of the radiative $p\bar p$ annihilation is made in the framework of a two-step formalism, the $p\bar p$ annihilates into meson channels containing a vector meson with a subsequent conversion into a photon via the vector dominance model (VDM). Both steps are derived from the underlying quark model. First, branching ratios for radiative protonium annihilation are calculated and compared with data. Then, details of the isospin interference are studied for different models of the initial protonium state and also for different kinematical form factors. The isospin interference is shown to be uniquely connected to the $p\bar p - n\bar n $ mixing in the protonium state. Values of the interference terms directly deduced from data are consistent with theoretical expectations, indicating a dominant $p\bar p$ component for the $^1S_0$ and a sizable $n\bar n$ component for the $^3S_1$ protonium state. The analysis is extended to the $p\bar p \to \gamma \Phi$ transition, where the large observed branching ratio remains unexplained in the VDM approach.
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"abstract": "A detailed analysis of the radiative $p\\bar p$ annihilation is made in the\nframework of a two-step formalism, the $p\\bar p$ annihilates into meson\nchannels containing a vector meson with a subsequent conversion into a photon\nvia the vector dominance model (VDM). Both steps are derived from the\nunderlying quark model. First, branching ratios for radiative protonium\nannihilation are calculated and compared with data. Then, details of the\nisospin interference are studied for different models of the initial protonium\nstate and also for different kinematical form factors. The isospin interference\nis shown to be uniquely connected to the $p\\bar p - n\\bar n $ mixing in the\nprotonium state. Values of the interference terms directly deduced from data\nare consistent with theoretical expectations, indicating a dominant $p\\bar p$\ncomponent for the $^1S_0$ and a sizable $n\\bar n$ component for the $^3S_1$\nprotonium state. The analysis is extended to the $p\\bar p \\to \\gamma \\Phi$\ntransition, where the large observed branching ratio remains unexplained in the\nVDM approach.",
"arxiv_id": "nucl-th/9811039",
"authors": [
"T. Gutsche",
"R. Vinh Mau",
"M. Strohmeier-Presicek",
"A. Faessler"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.59.630",
"journal_ref": "Phys.Rev. C59 (1999) 630-641",
"title": "Radiative proton-antiproton annihilation and isospin mixing in protonium",
"url": "https://arxiv.org/abs/nucl-th/9811039"
},
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