The strangeness content of the nucleon from effective field theory and phenomenology
The strangeness content of the nucleon from effective field theory and phenomenology
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DOI：
10.1016/j.physletb.2014.01.065
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
J. M. Alarcón;L. Geng;J. Camalich;J. A. Oller
中科院分区：
文献类型：
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作者：
J. M. Alarcón;L. Geng;J. Camalich;J. A. Oller
本文在洛伦兹协变手征微扰理论的背景下，重新讨论了核子奇异含量、π-核子σ项和重子质量SU（3）F破缺之间的经典关系.我们发现，π介子-核子σ项的值为1060 MeV不一定与核子的小奇异含量不一致，符合OZI规则的实现。此外，这个值确实受到我们的次领先订单计算的青睐。我们比较我们的结果与以前的手征级数的收敛性，以及手征方法的不确定性，以确定的西格玛条款。
We revisit the classical relation between the strangeness content of the nucleon, the pion–nucleon sigma term and the SU (3) F breaking of the baryon masses in the context of Lorentz covariant chiral perturbation theory with explicit decuplet-baryon resonance fields. We find that a value of the pion–nucleon sigma term of∼ 60 MeV is not necessarily at odds with a small strangeness content of the nucleon, in line with the fulfillment of the OZI rule. Moreover, this value is indeed favored by our next-to-leading order calculation. We compare our results with earlier ones and discuss the convergence of the chiral series as well as the uncertainties of chiral approaches to the determination of the sigma terms.