Hidden-charm and bottom meson-baryon molecules coupled with five-quark states

Abstract

In this paper, we investigate the hidden-charm pentaquarks asD ( * ) Λ c andD ( * ) Σ ( * ) c molecules coupled to the five-quark states. Furthermore, we extend our calculations to the hidden-bottom sector. The coupling to the five-quark states is treated as the short range potential, where the relative strength for the meson-baryon channels is determined by the structure of the five-quark states. We found that resonant and/or bound states appear in both the charm and bottom sectors.The five-quark state potential turned out to be attractive and, for this reason, it plays an important role to produce these states. In the charm sector, we need the five-quark potential in addition to the pion exchange potential in producing bound and resonant states, whereas, in the bottom sector, the pion exchange interaction is strong enough to produce states. Thus, from this investigation, it emerges that the hidden-bottom pentaquarks are more likely to form than their hidden-charm counterparts; for this reason, we suggest that the experimentalists should look for states in the bottom sector.

Heavy quark spin multiplet structure of P¯(*)ΣQShimizu1, Yamaguchi2, Harada3 2018Phys. Rev. DSelf Cite142120View full textAdd to dashboardCite

“…In Refs. [34,38], the short-range interaction in the P c pentaquarks are studied, which is derived based on the quark cluster model. The contributions from the color magnetic interaction of ccuud are evaluated, and they find that the ccuud configurations having the other spin j ¼ 3=2 are important to produce an attraction.…”

“…In 2015, the Large Hadron Collider beauty experiment (LHCb) Collaboration announced the observation of two hidden-charm pentaquarks, P Before the LHCb observation, some theoretical studies of hidden-charm pentaquarks were done [4][5][6][7]. After the LHCb announcement, there were many analyses based on the hadronic molecular state [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], compact pentaquark state [25][26][27][28][29][30][31][32][33], quark-cluster model [34], baryocharmonium model [35], hadroquarkonia model [36], topologial soliton model [37], and meson-baryon molecules coupled with five-quark states [38]. The kinematical rescattering effects are also discussed in Refs.…”

Pc(4457)+ , PcCheng1, Liu2 2019Phys. Rev. D940580View full textAdd to dashboardCite

“…threshold, one more state around the P c ð4440Þ þ is expected. If short-range interactions are considered, the number of molecular states will be reduced because of the forbidden states [60]. Therefore, the full J=ψp spectrum is also helpful to establish state assignments.…”

Hidden-charm meson-baryon molecules with a short-range attraction from five quark states

“…The negative sign of V 5q is assumed because of the massive compact 5q state giving an attraction [11]. The strength f and Gaussian range α are treated as a free parameter.…”