Masses of doubly heavy-quark baryons in an extended chromomagnetic model

Weng, Xin-Zhen; Chen, Xiaolin; Deng, Wubing

doi:10.1103/physrevd.97.054008

Cited by 73 publications

(77 citation statements)

References 165 publications

(250 reference statements)

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“…From Table IV, we see that Σ cD and Λ cD * are its dominant decay modes. It is worth stressing that the calculated mass of this state is just several MeV higher than the threshold of Σ cD (4321 MeV); considering the error of the model (Taking Ξ cc for example, our calculation differs from the experiment by 12 MeV [75]), this state may probably lie below the Σ cD threshold and thus cannot decay into this channel. If we assume that the P c (4327.0, 1/2, 1/2 − ) corresponds to the observed P c (4312) state, we have If the P c (4312) is observed in the N η c channel, and its partial decay width is larger than that of the N J/ψ channel, then the P c (4312) is very likely a tightly bound pentaquark which corresponds the P c (4327.0, 1/2, 1/2 − ).…”

Section: The Nnncc Systemmentioning

confidence: 76%

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Hidden-charm pentaquarks and Pc states

et al. 2019

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Recently, the LHCb Collaboration reported three Pc states in the J/ψp channel. We systematically study the mass spectrum of the hidden charm pentaquark in the framework of an extended chromomagnetic model. For the nnncc pentaquark with I = 1/2, we find that (i) the lowest state is Pc(4327.0, 1/2, 1/2 − ) [We use Pc(m, I, J P ) to denote the nnncc pentaquark], which corresponds to the Pc(4312). Its dominant decay mode is ΛcD * . (ii) We find two states in the vicinity of Pc(4380). The first one is Pc(4367.4, 1/2, 3/2 − ) and decays dominantly to N J/ψ and ΛcD * . The other one is Pc(4372.4, 1/2, 1/2 − ). Its dominant decay mode is ΛcD, and its partial decay width of N ηc channel is comparable to that of N J/ψ. (iii) In higher mass region, we find Pc(4476.3, 1/2, 3/2 − ) and Pc(4480.9, 1/2, 1/2 − ), which correspond to Pc(4440) and Pc (4457). In the open charm channels, both of them decay dominantly to the ΛcD * . (iv) We predict two states above 4.5 GeV, namely Pc(4524.5, 1/2, 3/2 − ) and Pc(4546.0, 1/2, 5/2 − ). The masses of the nnncc state with I = 3/2 are all over 4.6 GeV. Moreover, we use the model to explore the nnscc, ssncc, and ssscc pentaquark states. P c (4312) + : M = 4311.9 ± 0.7 +6.8 −0.6 MeV, Γ = 9.8 ± 2.7 +3.7 −4.5 MeV, P c (4440) + : M = 4440.3 ± 1.3 +4.1 −4.7 MeV, Γ = 20.6 ± 4.9 +8.7 −10.1 MeV, P c (4457) + : M = 4457.3 ± 0.6 +4.1 −1.7 MeV, Γ = 6.4 ± 2.0 +5.7 −1.9 MeV.Since their masses are slightly below the Σ cD , Σ * cD , and Σ cD * thresholds respectively, they can be interpreted as molecules composed of a charm baryon and an anticharm meson [37][38][39][40][41][42][43][44][45][46][47][48][49]. For example, Chen [46] interpreted them as bound states of Σ cD with J P = 1/2 − , Σ * cD with J P = 3/2 − , and Σ cD * with J P = 3/2 − , while Chen et al. [45], He [48], and Liu et al. [49] interpreted the P c (4312), P c (4440), and P c (4457) as loosely bound Σ cD with (I = 1/2, J P = 1/2 − ), Σ cD * with (I = 1/2, J P = 1/2 − ), and Σ cD * with (I = 1/2, J P = 3/2 − ). Another interesting possibility is that some of the P c states might be tightly bound pentaquark states. The light q 4q pentaquark states was first studied with the color-magnetic interaction among the quarks [9,10]. Later, Strottman used the MIT bag model to discuss this arXiv:1904.09891v3 [hep-ph] 26 Jul 2019 *

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Section: The Nnncc Systemmentioning

confidence: 76%

“…As pointed out in Refs. [72,73,75], the effective quark masses are not enough to absorb all the two-body chromoelectric effects. To solve this problem, Høgaasen et al generalized the chromomagnetic model by including a chromoelectric term [73]…”

Section: The Extended Chromomagnetic Modelmentioning

confidence: 99%

Hidden-charm pentaquarks and Pc states

et al. 2019

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“…3. If we use m Ξ bc = 6922 MeV, m Ξ bc = 6948 MeV, and m Ξ * bc = 6973 MeV [66], one finds that the lowest two bcnns pentaquarks should be stable and the lowest J P = 3/2 − state is probably narrow. Since the three I = 3/2 bcnnn states are more than 350 MeV lower than the Λ b D threshold and just above the Ξ bc π threshold, they probably have narrow widths and we may use the Ξ bc π channels to identify such pentaquarks.…”

Section: B the Bcnnq And Bcssq Pentaquark Statesmentioning

confidence: 99%

Surveying exotic pentaquarks with the typical QQqqq¯ configuration

et al. 2018

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As a hot issue, exploring exotic pentaquarks is full of challenges and opportunities for both theorist and experimentalist. In this work, we focus on a type of pentaquark with the QQqqq (Q = b, c; q = u, d, s) configuration, where their mass spectrum is estimated systematically. Especially, our result indicates that there may exist some stable or narrow exotic pentaquark states. Obviously, our study may provides valuable information for further experimental search for the QQqqq pentaquarks. With the running of LHCb and forthcoming Belle II, we have a reason to believe that these predictions present here can be tested.

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“…In the literature, there are a plenty of studies on the vacuum mass of the spin−3/2 doubly heavy baryons listed in the same table. We refer to some of them, which are extracted using: an Extended Choromomagnetic Model (ECM) [33], the Bethe Salpeter Equation Approach (BSEA) [35], Vacuum QCD Sum Rule (VQCDSR) [15,21] , a Relativized Quark Model (RQM) [17,32], the Feynman-Hellmann Theorem (FHT) [56] , Quark Model (QM) [16], Lattice QCD (LQCD) [7] and a Bag Model (BM) [57].…”

Section: The Analysis Of the Sum Rulesmentioning

confidence: 99%

“…The spectroscopic parameters and production of the doubly heavy baryons have been widely investigated via different methods and approaches in vacuum [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. The studies devoted to their investigation in medium, however, are very limited [37][38][39].…”

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confidence: 99%

Fate of the doubly heavy spin- 3/2 baryons in a dense medium

Azizi

2019

Phys. Rev. D

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We investigate the behavior of the doubly heavy spin−3/2 baryons in cold nuclear matter.In particular, we study the variations of the spectroscopic parameters of the ground state Ξ * QQ ′ and Ω * QQ ′ particles, with Q and Q ′ being b or c quark, with respect to the changes in the density of the nuclear medium. We find the shifts on the parameters under question at saturation medium density compared to their vacuum values. It is observed that the parameters of the Ξ * QQ ′ states containing two heavy quarks and one up or down quark are affected by the medium, considerably. The parameters of the Ω * QQ ′ states containing two heavy quarks and one strange quark, however, do not show any sensitivity to the density of the cold nuclear medium. We also discuss the variations of the vector self-energy at each channel with respect to the changes in the density. The negative shifts in the mass of Ξ * QQ ′ states due to nucleons in the medium can be used to study the doubly heavy baryons' interactions with the nucleons. The results obtained can also be used in analyses of the results of the future in-medium experiments.

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Masses of doubly heavy-quark baryons in an extended chromomagnetic model

Cited by 73 publications

References 165 publications

Hidden-charm pentaquarks and Pc states

Hidden-charm pentaquarks and Pc states

Surveying exotic pentaquarks with the typical QQqqq¯ configuration

Fate of the doubly heavy spin- 3/2 baryons in a dense medium

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