Evaluating alternative spin scenarios of $P_{c\bar{c}}(4440)$ and $P_{c\bar{c}}(4457)$ using heavy quark symmetries

TL;DR

This paper uses heavy quark symmetries to predict the spin states of the $P_{car{c}}(4440)$ and $P_{car{c}}(4457)$ states, proposing specific spin assignments and exploring related heavy baryon states.

Contribution

It introduces a novel application of heavy quark and antiquark-diquark symmetries to determine the spin states of these pentaquark candidates.

Findings

$P_{car{c}}(4440)$ likely has $J^P=1/2$

$P_{car{c}}(4457)$ likely has $J^P=3/2$

Predicted masses of $P_{car{c}s}$ states support these spin assignments.

Abstract

Heavy quark symmetries are useful for predicting the existence of heavy states, their masses, and spin states. Despite numerous studies on the $P_{c\bar{c}}(4440)$ and $P_{c\bar{c}}(4457)$ heavy states, their spin states have not been previously determined. In this study, heavy symmetries are applied to predict the spin states. If the $P_{c\bar{c}}(4440)$ and $P_{c\bar{c}}(4457)$ states are considered $\bar{D}^*\Sigma_c$ molecules, they can be classified as heavy partners. This classification may help clarify their potential connections with heavy antiquark-diquark symmetry partners. By utilizing these alternative spin assignments and the concept of heavy antiquark-diquark symmetry, it may be possible to estimate $\Xi_{cc}^{(*)}\Sigma_c^{(*)}$ states, and ultimately, their spin states, which have not been elucidated in experiments. In addition to these symmetries, the relationship between $P_{c\bar{c}}$ and $P_{c\bar{c}s}$ pentaquarks can be constructed which supports the prediction of possible $P_{c\bar{c}s}$ states. The predicted masses of the $P_{c\bar{c}s}(4338)$ and $P_{c\bar{c}s}(4459)$ states align with several studies, allowing us to eliminate a specific spin state. One spin state appears to be favored, suggesting that $P_{c\bar{c}}(4440)$ has $J^P=\frac{1}{2}$ and $P_{c\bar{c}}(4457)$ has $J^P=\frac{3}{2}$.