|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Revisiting the nature of the $P_c$ pentaquarks | | Meng-Lin Du
; Vadim Baru
; Feng-Kun Guo
; Christoph Hanhart
; Ulf-G. Meißner
; José A. Oller
; Qian Wang
; | | Date: |
14 Feb 2021 | | Abstract: | The nature of the three narrow hidden-charm pentaquark $P_c$ states is under
intense discussion since their discovery from the updated analysis of the
process $Lambda_b^0 o J/psi pK^-$ by LHCb. In this work we extend our
previous coupled-channel approach [Phys. Rev. Lett. 124, 072001 (2020)] by
including the $Lambda_car{D}^{(*)}$ and $eta_cp$ explicitly as required by
unitarity and HQSS, respectively. Three calculation schemes are considered: (a)
scheme I with pure contact interactions between the elastic and inelastic
channels and without the $Lambda_car D^{(*)}$ interactions, (b) scheme II,
where the OPE is added to scheme I, and (c) scheme III, where the
$Lambda_car D^{(*)}$ interactions are included in addition. It is shown that
to obtain cutoff independent results, OPE in the multichannel system is to be
supplemented with $S$-wave-to-$D$-wave mixing contact terms. As a result we
demonstrate that the experimental data are consistent with the interpretation
of the $P_c(4312)$ and $P_c(4440)/P_c(4457)$ as $Sigma_car{D}$ and $Sigma_c
ar{D}^{*}$ molecules, respectively, and that the data show clear evidence for
a new narrow state, $P_c(4380)$, identified as a $Sigma_c^*ar D$ molecule,
which should exist as a consequence of HQSS. However, now two solutions are
found in all schemes which describe the data equally well, and thus no
unambiguous conclusion about the quantum numbers of the $P_c(4440)$ and
$P_c(4457)$ from data in the $J/psi p$ channel alone is possible. It is argued
that one of these solutions, in which the quantum numbers of the $P_c(4440)$
and $P_c(4457)$ are $J^P=3/2^-$ and $1/2^-$, respectively, is theoretically
preferred. Moreover, we demonstrate that the line shapes related to the
$P_c(4440)$ and $P_c(4457)$ in the $Sigma_c^{(*)}ar{D}$ and $eta_cp$ mass
distributions will allow one to pin down their quantum numbers once the data
are available. | | Source: | arXiv, 2102.07159 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER