The width of the Roper resonance in baryon chiral perturbation theory

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• 作者：Jambul Gegelia^a ; ^b ; ^{j.gegelia@fz-juelich.de" class="auth_mail" title="E-mail the corresponding author} ; Ulf-G. Meiß ; ner^a ; ^c ; ^{meissner@hiskp.uni-bonn.de" class="auth_mail" title="E-mail the corresponding author} ; De-Liang Yao^a ; ^{d.yao@fz-juelich.de" class="auth_mail" title="E-mail the corresponding author} ; ^{yaodeliang@pku.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 September 2016
• 年：2016
• 卷：760
• 期：Complete
• 页码：736-741
• 全文大小：308 K

文摘

We calculate the width of the Roper resonance at next-to-leading order in a systematic expansion of baryon chiral perturbation theory with pions, nucleons, and the delta and Roper resonances as dynamical degrees of freedom. Three unknown low-energy constants contribute up to the given order. One of them can be fixed by reproducing the empirical value for the width of the Roper decay into a pion and a nucleon. Assuming that the remaining two couplings of the Roper interaction take values equal to those of the nucleon, the result for the width of the Roper decaying into a nucleon and two pions is consistent with the experimental value.