کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9851490 1527295 2005 51 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Compton scattering on the proton, neutron, and deuteron in chiral perturbation theory to O(Q4)
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Compton scattering on the proton, neutron, and deuteron in chiral perturbation theory to O(Q4)
چکیده انگلیسی
We study Compton scattering in systems with A=1 and 2 using chiral perturbation theory up to fourth order. For the proton we fit the two undetermined parameters in the O(Q4)γp amplitude of McGovern to experimental data in the region ω,|t|⩽180MeV, obtaining a χ2/d.o.f. of 133/113. This yields a model-independent extraction of proton polarizabilities based solely on low-energy data: αp=(12.1±1.1(stat.))−0.5+0.5(theory) and βp=(3.4±1.1(stat.))−0.1+0.1(theory), both in units of 10−4fm3. We also compute Compton scattering on deuterium to O(Q4). The γd amplitude is a sum of one- and two-nucleon mechanisms, and contains two undetermined parameters, which are related to the isoscalar nucleon polarizabilities. We fit data points from three recent γd scattering experiments with a χ2/d.o.f.=26.6/20, and find αN=(13.0±1.9(stat.))−1.5+3.9(theory) and a βN that is consistent with zero within sizable error bars.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics A - Volume 747, Issues 2–4, 24 January 2005, Pages 311-361
نویسندگان
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