dorsal/arxiv
View SchemaFirst Extraction of a Spin-Polarizability of the Proton
| Authors | J. Tonnison, A. M. Sandorfi, S. Hoblit, A. M. Nathan |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9801008 |
| URL | https://arxiv.org/abs/nucl-th/9801008 |
| DOI | 10.1103/PhysRevLett.80.4382 |
| Journal | Phys.Rev.Lett. 80 (1998) 4382-4385 |
Abstract
A proton spin-polarizability characterizing backward Compton scattering has been extracted from a dispersion analysis of data between 33 and 309 MeV. This backward spin-polarizability, "delta" = 27.1 +/-2.2(stat+sys) +2.8/-2.4(model) in units of 10^-4 fm^4, differs significantly from theoretical estimates which are dominated by pi0 t-channel exchange, and indicates a new contribution from the non-perturbative spin-structure of the proton. This new value for "delta" removes an apparent inconsistency in the difference of charge polarizabilities extracted from data above pi-threshold. Our global result, alpha-beta = 10.11 +/-1.74(stat+sys) +1.22/-0.86 (model) in units of 10^-4 fm^3, is consistent with the previous world average of data below 155 MeV. Our value for alpha+beta = 13.23 +/-0.86(stat+sys) +0.20/-0.49(model) is consistent with a recent re-evaluation of the Baldin sum rule.
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"abstract": "A proton spin-polarizability characterizing backward Compton scattering has\nbeen extracted from a dispersion analysis of data between 33 and 309 MeV. This\nbackward spin-polarizability, \"delta\" = 27.1 +/-2.2(stat+sys) +2.8/-2.4(model)\nin units of 10^-4 fm^4, differs significantly from theoretical estimates which\nare dominated by pi0 t-channel exchange, and indicates a new contribution from\nthe non-perturbative spin-structure of the proton. This new value for \"delta\"\nremoves an apparent inconsistency in the difference of charge polarizabilities\nextracted from data above pi-threshold. Our global result, alpha-beta = 10.11\n+/-1.74(stat+sys) +1.22/-0.86 (model) in units of 10^-4 fm^3, is consistent\nwith the previous world average of data below 155 MeV. Our value for alpha+beta\n= 13.23 +/-0.86(stat+sys) +0.20/-0.49(model) is consistent with a recent\nre-evaluation of the Baldin sum rule.",
"arxiv_id": "nucl-th/9801008",
"authors": [
"J. Tonnison",
"A. M. Sandorfi",
"S. Hoblit",
"A. M. Nathan"
],
"categories": [
"nucl-th",
"nucl-ex"
],
"doi": "10.1103/PhysRevLett.80.4382",
"journal_ref": "Phys.Rev.Lett. 80 (1998) 4382-4385",
"title": "First Extraction of a Spin-Polarizability of the Proton",
"url": "https://arxiv.org/abs/nucl-th/9801008"
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