Exotic 
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 four-quark states

Caramés, Teresa Fernández; Vijande, J.; Valcarce, A.

doi:10.1103/physrevd.99.014006

Cited by 44 publications

(35 citation statements)

References 29 publications

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“…In these sector, some bound or resonance states are obtained only for isoscalar tetraquarks, and our theoretical findings in meson-meson channels are comparable with those results in Table Vof Ref. [94]. Hence, we will discuss them according to IðJ P Þ quantum numbers individually.…”

Section: Charm-bottom Tetraquarkssupporting

confidence: 82%

Double-heavy tetraquarks

2020

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In the framework of the chiral quark model along with complex scaling range, we perform a dynamical study on the low-lying S-wave double-heavy tetraquark states (QQqq, Q ¼ c, b and q ¼ u, d) with an accurate computing approach, Gaussian expansion method. The meson-meson and diquark-antidiquark configurations within all possible color structures for spin-parity quantum numbers J P ¼ 0 þ , 1 þ , and 2 þ and in the 0 and 1 isospin sectors are considered. Possible tightly bound and narrow resonance states are obtained for double-charm and double-bottom tetraquarks with IJ P ¼ 01 þ , and these exotic states are also obtained in charm-bottom tetraquarks with 00 þ and 01 þ quantum numbers. Only a loosely bound state is found in charm-bottom tetraquarks of 02 þ states. All of these bound states within meson-meson configurations are loosely bound whether in color-singlet channels or coupling to hidden-color ones. However, compact structures are available in diquark-antidiquark channels except for charm-bottom tetraquarks in 02 þ states.

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Section: Charm-bottom Tetraquarkssupporting

confidence: 82%

Double-heavy tetraquarks

2020

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“…[75,81] suggest a binding energy for the isoscalar J P = 1 + bottom-bottom tetraquark of 143 ± 34 MeV and 128±24±10 MeV respectively (relative to the BB * thresholds), while the recent quark-model calculation of Ref. [100] locates the isoscalar J P = 1 + charm-bottom tetraquark at B 2 = 164 MeV with respect to the D * B * threshold. Notice that here we are predicting a molecular state instead of a compact tetraquark.…”

Section: Discussionmentioning

confidence: 99%

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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“…[4] for a recent compendium-about the existence of a deeply-bound doubly-bottom tetraquark, T bb , with quantum numbers (I)J P = (0)1 + , strong-and electromagnetic-interaction stable with a binding energy that might be as large as 100 MeV or more [4][5][6][7][8][9][10][11][12][13]. This exciting perspective is further reinforced by recent calculations predicting the stability of tetraquarks with distinguishable heavy quarks, QQ ′qq ≡ T QQ ′ [6,14,15].…”

Section: Introductionmentioning

confidence: 99%

Production of exotic tetraquarks QQq¯q¯ in heavy-ion collisions at the LHC

et al. 2019

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We investigate the production of exotic tetraquarks, QQqq ≡ T QQ (Q = c or b and q = u or d), in relativistic heavy-ion collisions using the quark coalescence model. The T QQ yield is given by the overlap of the density matrix of the constituents in the emission source with the Wigner function of the produced tetraquark. The tetraquark wave function is obtained from exact solutions of the four-body problem using realistic constituent models. The production yields are typically one order of magnitude smaller than previous estimations based on simplified wave functions for the tetraquarks. We also evaluate the consequences of the partial restoration of chiral symmetry at the hadronization temperature on the coalescence probability. Such effects, in addition to increasing the stability of the tetraquarks, lead to an enhancement of the production yields, pointing towards an excellent discovery potential in forthcoming experiments. We discuss further consequences of our findings for the search of exotic tetraquarks in central Pb+Pb collisions at the LHC.

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Exotic bcq¯q¯ four-quark states

Cited by 44 publications

References 29 publications

Double-heavy tetraquarks

Double-heavy tetraquarks

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

Production of exotic tetraquarks QQq¯q¯ in heavy-ion collisions at the LHC

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