Peaks within peaks and the possible two-peak structure of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>P</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>4457</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> : The effective field theory perspective

The LHCb pentaquarks -- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ have been theorized to be $\Sigma_c \bar{D}$ \bar{D}^*$ S-wave molecules. Here we explore possibility that two of these contain in addition a $\Lambda_c(2595) component P-wave. We will analyze effects this extra channel within effective field theories: first one standard contact-range theory second include non-diagonal pion dynamics connecting channels, which happens unusually long-ranged. impact coupled-channel between components is modest at best for $P_c(4457)$, remain predominantly However, if quantum numbers are $J^P = \frac{1}{2}^-$, likely induce binding molecule (coupled P-wave) with \frac{1}{2}^+$ mass similar $P_c(4457)$. If case, could actually double peak containing different pentaquark states.