excited states within a  HQSS model

J. Nieves; R. Pavao; L. Tolos

doi:10.1140/epjc/s10052-018-5597-3

EPJ

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2018) 78: 114
https://doi.org/10.1140/epjc/s10052-018-5597-3

Regular Article - Theoretical Physics

$\Omega _c$ excited states within a $\mathrm{SU(6)}_{\mathrm{lsf}}\times$ HQSS model

J. Nieves¹, R. Pavao¹ and L. Tolos²^,3^,4^,5^*

¹ Instituto de Física Corpuscular (centro mixto CSIC-UV), Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
² Institut für Theoretische Physik, University of Frankfurt, Max-von-Laue-Str. 1, 60438, Frankfurt am Main, Germany
³ Frankfurt Institute for Advanced Studies, University of Frankfurt, Ruth-Moufang-Str. 1, 60438, Frankfurt am Main, Germany
⁴ Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, 08193, Barcelona, Spain
⁵ Institut d’Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain

^* e-mail: tolos@th.physik.uni-frankfurt.de

Received: 1 December 2017
Accepted: 26 January 2018
Published online: 7 February 2018

Abstract

We have reviewed the renormalization procedure used in the unitarized coupled-channel model of Romanets et al. (Phys Rev D 85:114032, 2012), and its impact in the $$C=1$$ , $S=-\,2$ , and $$I=0$$ sector, where five $\Omega _c^{(*)}$ states have been recently observed by the LHCb Collaboration. The meson-baryon interactions used in the model are consistent with both chiral and heavy-quark spin symmetries, and lead to a successful description of the observed lowest-lying odd parity resonances $\Lambda _c(2595)$ and $\Lambda _c(2625)$ , and $\Lambda _b(5912)$ and $\Lambda _b(5920)$ resonances. We show that some (probably at least three) of the states observed by LHCb will also have odd parity and $$J=1/2$$ or $$J=3/2$$ , belonging two of them to the same $\mathrm{SU(6)}_{\mathrm{light}\text {-}\mathrm{spin}\text {-}\mathrm{flavor}}\times$ HQSS multiplets as the latter charmed and beauty $\Lambda$ baryons.