Beauty-full tetraquarks

Bai, Y.; Lu, S. Q.; Osborne, James

doi:10.1016/j.physletb.2019.134930

Cited by 115 publications

(65 citation statements)

References 37 publications

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“…When one attempts to restore the proper Fermi statistics, the extra-attraction is lost [40]. The role of Fermi statistics is not mentioned in [4], and hence we believe that they predict binding for a (QQ QQ ) fictitious system with Q = Q but both having the same mass as the b quark. This is similar to our finding in [39].…”

Section: Improved Chromoelectric Modelsmentioning

confidence: 96%

String dynamics and metastability of all-heavy tetraquarks

2017

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Multiquark states have been advocated to explain recent experimental data in the heavy-light sector, and there are already speculations about multiquarks containing only heavy quarks and antiquarks. With a rigorous treatment of the four-body problem in current quark models, full-charm (cccc) and full-beauty (b bbb) tetraquarks are found to be unbound. Thus their stability should rely on more subtle effects that are not included in the simple picture of constituent quarks. The case of (bcbc) might be more favorable if the naive color-additive model of confinement is replaced by a string-inspired interaction. *

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Section: Improved Chromoelectric Modelsmentioning

confidence: 96%

String dynamics and metastability of all-heavy tetraquarks

2017

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“…However, no evidence has been provided from the LHCb Collaboration by searching for the ϒð1SÞμ þ μ − invariant mass spectrum [33]. Extensive theoretical works with different schemes are devoted to these extremely nonrelativistic systems, QQQQ (Q ¼ c, b): The existence of bbbb bound state is supported by a phenomenological model calculation [34][35][36][37], QCD sum rules [38,39], and the diffusion Monte Carlo method [40]. A narrow cccc tetraquark state in the mass region 5-6 GeV has been predicted by the Bethe-Salpeter approach [41] and also in several phenomenological models [34,[42][43][44].…”

Section: Introductionmentioning

confidence: 99%

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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“…(See, for example, Refs. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].) We will present our own mass estimates, noting experimental strategies that might be particularly appropriate for present-day and near-future searches.…”

Section: Introductionmentioning

confidence: 99%

QQQ¯Q¯ states: Masses, production, and decays

2017

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The question of whether there exist bound states of two heavy quarks Q = (c, b) and antiquarksQ = (c,b), distinct from a pair of quark-antiquark mesons, has been debated for more than forty years. We estimate masses of Q 1 Q 2Q3Q4 resonant states X Q 1 Q 2Q3Q4 and suggest means of producing and observing them. We concentrate on the cccc channel which is most easily produced and the bbbb channel which has a better chance of being relatively narrow. We obtain M(X cccc ) = 6,192±25 MeV and M(X bbbb ) = 18,826±25 MeV, for the J P C = 0 ++ states involving charmed and bottom tetraquarks, respectively. Experimental search for these states in the predicted mass range is highly desirable.

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Beauty-full tetraquarks

Cited by 115 publications

References 37 publications

String dynamics and metastability of all-heavy tetraquarks

String dynamics and metastability of all-heavy tetraquarks

Double-heavy tetraquarks

QQQ¯Q¯ states: Masses, production, and decays

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