dorsal/arxiv
View SchemaSpin Information from Vector-Meson Decay in Photoproduction
| Authors | W. M. Kloet, Wen-Tai Chiang, Frank Tabakin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9803042 |
| URL | https://arxiv.org/abs/nucl-th/9803042 |
| DOI | 10.1103/PhysRevC.58.1086 |
| Journal | Phys.Rev.C58:1086-1097,1998 |
Abstract
For the photoproduction of vector mesons, all single and double spin observables involving vector meson two-body decays are defined consistently in the $\gamma N$ center of mass. These definitions yield a procedure for extracting physically meaningful single and double spin observables that are subject to known rules concerning their angle and energy evolution. As part of this analysis, we show that measuring the two-meson decay of a photoproduced $\rho$ or $\phi$ does not determine the vector meson's vector polarization, but only its tensor polarization. The vector meson decay into lepton pairs is also insensitive to the vector meson's vector polarization, unless one measures the spin of one of the leptons. Similar results are found for all double spin observables which involve observation of vector meson decay. To access the vector meson's vector polarization, one therefore needs to either measure the spin of the decay leptons, make an analysis of the background interference effects or relate the vector meson's vector polarization to other accessible spin observables.
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"abstract": "For the photoproduction of vector mesons, all single and double spin\nobservables involving vector meson two-body decays are defined consistently in\nthe $\\gamma N$ center of mass. These definitions yield a procedure for\nextracting physically meaningful single and double spin observables that are\nsubject to known rules concerning their angle and energy evolution. As part of\nthis analysis, we show that measuring the two-meson decay of a photoproduced\n$\\rho$ or $\\phi$ does not determine the vector meson\u0027s vector polarization, but\nonly its tensor polarization. The vector meson decay into lepton pairs is also\ninsensitive to the vector meson\u0027s vector polarization, unless one measures the\nspin of one of the leptons. Similar results are found for all double spin\nobservables which involve observation of vector meson decay. To access the\nvector meson\u0027s vector polarization, one therefore needs to either measure the\nspin of the decay leptons, make an analysis of the background interference\neffects or relate the vector meson\u0027s vector polarization to other accessible\nspin observables.",
"arxiv_id": "nucl-th/9803042",
"authors": [
"W. M. Kloet",
"Wen-Tai Chiang",
"Frank Tabakin"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.58.1086",
"journal_ref": "Phys.Rev.C58:1086-1097,1998",
"title": "Spin Information from Vector-Meson Decay in Photoproduction",
"url": "https://arxiv.org/abs/nucl-th/9803042"
},
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