Triangle diagram in heavy-baryon chiral perturbation theory
Triangle diagram in heavy-baryon chiral perturbation theory
复制标题
重重子手征微扰理论中的三角图
DOI:
10.1088/1361-6471/ab4ed3
复制
发表时间:
2016-05
期刊:
影响因子:
--
通讯作者:
Bingwei Long
中科院分区:
文献类型:
--
作者:
Songlin Lyu;Bingwei Long
The pion-baryon triangle diagram is inspected for a special kinematic region where the squared momentum transfer $t$ is close to $4m_\pi^2$: $|t - 4m_\pi^2| \lesssim m_\pi^4/m_N^2$. Instead of arguing on the ground of anomalous threshold, we investigate possible impacts on power counting. The pion can have very small energies, as opposed to $\sim m_\pi$ in the physical region, which allows all three propagators to be extremely near their mass shell and contributes significantly to the loop integral. We find that in this narrow kinematic window the static-limit approximation for the baryon propagator is invalid and the resummation of the kinetic energy is necessary. Interestingly, in contrast to low-energy two-baryon processes, this resummation of baryon recoils does not lead to overall enhancement of power counting of the diagram.
登录
查看更多内容
影响因子:
5
作者:
J. Camalich;L. Geng;M. V. Vacas
通讯作者:
J. Camalich;L. Geng;M. V. Vacas
影响因子:
5
作者:
M. Bayar;F. Aceti;F. Guo;E. Oset
通讯作者:
M. Bayar;F. Aceti;F. Guo;E. Oset
DOI:
--
发表时间:
1983
期刊:
--
影响因子:
--
作者:
S. Berman;U. Maor
通讯作者:
S. Berman;U. Maor
影响因子:
5
作者:
J. M. Alarcón;J. A. Oller;J. Camalich
通讯作者:
J. M. Alarcón;J. A. Oller;J. Camalich
DOI:
10.1007/bf02732141
发表时间:
1960-09
期刊:
Il Nuovo Cimento (1955-1965)
影响因子:
--
作者:
M. Fowler;P. Landshoff;R. Lardner
通讯作者:
M. Fowler;P. Landshoff;R. Lardner