Line shapes of the 
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Wang, Q.; Baru, V.; Filin, A. A.; Hanhart, C.; Nefediev, A. V.; Wynen, Jan-Lukas

doi:10.1103/physrevd.98.074023

Cited by 71 publications

(160 citation statements)

References 87 publications

(166 reference statements)

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“…The observed two Z b states have narrow widths, Γ Z b (10610) = 18.4 MeV and Γ Z b (10650) = 11.5 MeV [105], and they should not be compact tetraquarks. Since they are near-threshold states, the natural explanation is that they are hadronic molecules [106][107][108]. The Z c (3900) near the DD * threshold has a width around 28 MeV and is basically thought as a 1 +− DD * molecule.…”

Section: B Effective Interactions and Supplemental Results For The Cmentioning

confidence: 99%

Systematic studies of charmonium-, bottomonium-, and Bc -like tetraquark states

Liu

et al. 2019

Phys. Rev. D

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We study the mass splittings of Q1q2Q3q4 (Q = c, b, q = u, d, s) tetraquark states with chromomagnetic interactions between their quark components. Assuming that X(4140) is the lowest J P C = 1 ++ cscs tetraquark, we estimate the masses of the other tetraquark states. From the obtained masses and defined measure reflecting effective quark interactions, we find the following assignments for several exotic states: (1) both X(3860) and the newly observed Zc(4100) seem to be 0 ++ cncn tetraquarks; (2) Zc(4200) is probably a 1 +− cncn tetraquark; (3) Zc(3900), X(3940), and X(4160) are unlikely compact tetraquarks; (4) Zc(4020) is unlikely a compact tetraquark, but seems the hidden-charm correspondence of Z b (10650) with J P C = 1 +− ; and (5) Zc(4250) can be a tetraquark candidate but the quantum numbers cannot be assigned at present. We hope further studies may check the predictions and assignments given here.

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Section: B Effective Interactions and Supplemental Results For The Cmentioning

confidence: 99%

Systematic studies of charmonium-, bottomonium-, and Bc -like tetraquark states

Liu

et al. 2019

Phys. Rev. D

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“…Owing to their closeness to the B * B and B * B * thresholds, the Z b 's have been proposed to be molecular [43,64]. [65] suggest B 2 = 0.9 − 1.7 MeV for the Z b (i.e. a bit closer to threshold than in Ref.…”

Section: The Isovector Heavy Meson-antimeson Systemmentioning

confidence: 89%

Heavy-quark spin and flavor symmetry partners of the X(3872) revisited: What can we learn from the one boson exchange model?

et al. 2019

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Heavy-quark symmetry as applied to heavy hadron systems implies that their interactions are independent of their heavy-quark spin (heavy-quark spin symmetry) and heavy flavour contents (heavy flavour symmetry). In the molecular hypothesis the X(3872) resonance is a 1 ++ D * D bound state. If this is the case, the application of heavy-quark symmetry to a molecular X(3872) suggests the existence of a series of partner states, the most obvious of which is a possible 2 ++ D * D * bound state for which the two-body potential is identical to that of the 1 ++ D * D system, the reason being that these two heavy hadron-antihadron states have identical light-spin content. As already discussed in the literature this leads to the prediction of a partner state at 4012 MeV, at least in the absence of other dynamical effects which might affect the location of this molecule. However the prediction of further heavy-quark symmetry partners cannot be done solely on the basis of symmetry and requires additional information. We propose to use the one boson exchange model to fill this gap, in which case we will be able to predict or discard the existence of other partner states. Besides the isoscalar 2 ++ D * D * bound state, we correctly reproduce the location and quantum numbers of the isovector hidden-bottom Z b (10610) and Z b (10650) molecular candidates. We also predict the hidden-bottom 1 ++ B * B * and 2 ++ B * B * partners of the X(3872), in agreement with previous theoretical speculations, plus a series of other states. The isoscalar, doubly charmed 1 + DD * and D * D * molecules and their doubly bottomed counterparts are likely to bind, providing a few instances of explicitly exotic systems.2 −D * Σ * c state. Yet, with the exception of the doubly charmed pentaquark family, heavyquark symmetry alone is in general not able to determine the

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“…about an order of magnitude larger than the experimental upper limit [15]. The reason for such suppression is not known and the behavior is described in terms of a form factor suppression [16] of the pion exchange or as an effect of a contact term [17] effectively canceling the pion contribution. Given that the puzzle of that suppression is not yet resolved, it is currently not clear if a similar behavior may take place in the decays of hidden-charm molecules to Λ cD ( * ) .…”

mentioning

confidence: 91%

Some decay properties of hidden-charm pentaquarks as baryon-meson molecules

Voloshin

2019

Phys. Rev. D

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It is pointed out that the previously suggested interpretation of the hidden-charm pentaquarks P c (4312), P c (4440) and P c (4457) as molecular bound states of Σ cD and Σ cD * baryon-meson pairs gives rise to specific relations for their decays. In particular, the heavy quark spin symmetry predicts ratios of rates of decays of each of the molecules to J/ψp and to η c p as well as of the decays to Λ cD and to Λ cD * . Experimental studies of these relations would thus provide an indicative probe of the molecular structure.The initial experimental evidence [1, 2] for hidden-charm pentaquarks has been recently refined into an observation [3] of three relatively narrow resonances P c (4312), P c (4440) and P c (4457) in the J/ψp system produced in the decays Λ b → J/ψpK. The measured positions of the resonance peaks are just few MeV below the thresholds for hidden-charm baryon-meson channels Σ cD and Σ cD * , and the experimental report [3] strongly suggests an interpretation of the lowest P c (4312) resonance as a shallow bound S wave state of Σ cD with the spinparity J P = 1/2 − and the two higher peaks as similar S wave bound systems of Σ cD * with J P = 1/2 − and J P = 3/2 − . Existence of molecular states with hidden heavy flavor was suggested long ago [4], and similar heavy meson-antimeson systems have been observed both with hidden charm [e.g. X(3872) [5]] and the bottomonium-like Z b (10610) and Z b (10650) [6].(Recent reviews of multiquark hadrons including molecular systems with hidden heavy flavor

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Line shapes of the Zb(10610) and Zb(10650

Cited by 71 publications

References 87 publications

Systematic studies of charmonium-, bottomonium-, and Bc -like tetraquark states

Systematic studies of charmonium-, bottomonium-, and Bc -like tetraquark states

Heavy-quark spin and flavor symmetry partners of the X(3872) revisited: What can we learn from the one boson exchange model?

Some decay properties of hidden-charm pentaquarks as baryon-meson molecules

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