The pion nucleon coupling constant

被引：33
作者：
Bugg, DV [1 ]
机构：
[1] Univ London, Queen Mary, London E1 4NS, England
来源：
EUROPEAN PHYSICAL JOURNAL C | 2004年 / 33卷 / 04期
关键词：
D O I：
10.1140/epjc/s2004-01666-y
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The latest piN elastic scattering data are re-analysed to determine the coupling constant g(c) of the charged pion, using the dispersion relation for the invariant amplitude B(+ ). Depending on the choice of data-base, values g(c)(2)/4pi = 13.80 to 13.65 are obtained with errors of +/- 0.12. The mass difference between charge states of Delta (1232) is M-0 -M++ = 2.0 +/- 0.4 MeV, close to twice the mass difference between neutron and proton. The difference in widths on resonance is Gamma(0) - Gamma(++) = 3.8 +/- 1.0 MeV. One may account for a width difference of 4.5 MeV from phase space for decays and the extra channel Delta(0) --> gamman.
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页码：505 / 509
页数：5
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