Exotic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi><mml:mi>Q</mml:mi><mml:mover accent="true"><mml:mi>q</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mover accent="true"><mml:mi>q</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi><mml:mi>Q</mml:mi><mml:mover accent="true"><mml:mi>q</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo>¯</

Du, Meng-Lin; Chen, Wei; Chen, Xiaolin; Zhu, Shi-Lin

doi:10.1103/physrevd.87.014003

Cited by 126 publications

(110 citation statements)

References 44 publications

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“…[10], "Four-quark states containing two identical heavy quarks are shown to have a good probability of being stable against strong decays." Recent treatments using QCD sum rules [14,15] have an error of 200 MeV on a central value M (bbūd) = 10300 MeV and therefore do not deliver a crisp answer regarding stability of the bbūd tetraquark against strong decays. An early estimate [16] concluded that the bbūd ground state tetraquark is stable against strong and EM interactions, with a mass of 130 ± 15 MeV below BB * threshold and 85 ± 15 MeV below B 0 B + γ threshold.…”

Section: Discussionmentioning

confidence: 99%

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯d
Karliner
¹
,
Rosner
²

2017
Phys. Rev. Lett.
338
22
243
4
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Recently LHCb discovered the first doubly-charmed baryon Ξ ++ cc = ccu at 3621.40 ± 0.78 MeV, very close to our theoretical prediction. We use the same methods to predict a doubly-bottom tetraquark T (bbūd) with J P =1 + at 10, 389 ± 12 MeV, 215 MeV below the B −B * 0 threshold and 170 MeV below threshold for decay to B −B0 γ. The T (bbūd) is therefore stable under strong and electromagnetic (EM) interactions and can only decay weakly, the first exotic hadron with such a property. On the other hand, the mass of T (ccūd) with J P =1 + is predicted to be 3882 ± 12 MeV, 7 MeV above the D 0 D * + threshold and 148 MeV above D 0 D + γ threshold. T (bcūd) with J P =0 + is predicted at 7134 ± 13 MeV, 11 MeV below theB 0 D 0 threshold. Our precision is not sufficient to determine whether bcūd is actually above or below the threshold. It could manifest itself as a narrow resonance just at threshold.

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Section: Discussionmentioning

confidence: 99%

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯d
Karliner
¹
,
Rosner
²

2017
Phys. Rev. Lett.
338
22
243
4
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“…The convention for the mixed condensate is consistent with Refs. [11,[18][19][20], which have a sign difference from some other QCD sum rule studies because of the definition of the coupling constant g s . We define the pole contribution (PC) using the sum rules established in Eq.…”

Section: Numerical Analysismentioning

confidence: 99%

“…We evaluate the correlation function up to dimension-eight condensate contributions at leading order in α s using the same technique as in Refs. [11,[18][19][20]. The spectral density is then obtained:…”

Section: Qcd Sum Rule and Spectral Densitymentioning

confidence: 99%

$$D^\bar{D}^$$ D ∗ D ¯ ∗ molecule interpretation of $$Z_c(4025)$$ Z c ( 4025 )

et al. 2014

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We have used QCD sum rules to study the newly observed charged state Z c (4025) as a hidden-charm D * D * molecular state with the quantum numbers I G (J P ) = 1 + (1 + ). Using a D * D * molecular interpolating current, we have calculated the two-point correlation function and the spectral density up to dimension eight at leading order in α s . The extracted mass is m X = (4.04 ± 0.24) GeV. This result is compatible with the observed mass of Z c (4025) within the errors, which implies a possible molecule interpretation of this new resonance. We also predict the mass of the corresponding hidden-bottom B * B * molecular state: m Z b = (9.98 ± 0.21) GeV.

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“…Especially the dimeson, dibaryon and pentaquark molecular systems with two charm/bottom quarks are particularly interesting, which have have been studied using various models [852,853,854,855,856,857], QCD sum rules [858,859] as well as the lattice QCD [860,861,862]. These hadrons may be produced either at LHC or through heavy ion collisions or through higher bottomonium decays.…”

Section: Hidden-charm Baryonium or Dibaryons With Two Charm Quarksmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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ExoticQQq¯q¯,QQq¯s¯

Cited by 126 publications

References 44 publications

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯d
Karliner
¹
,
Rosner
²

2017
Phys. Rev. Lett.
338
22
243
4
View full text Add to dashboard Cite

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯d
Karliner
¹
,
Rosner
²

2017
Phys. Rev. Lett.
338
22
243
4
View full text Add to dashboard Cite

$$D^\bar{D}^$$ D ∗ D ¯ ∗ molecule interpretation of $$Z_c(4025)$$ Z c ( 4025 )

The hidden-charm pentaquark and tetraquark states

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ExoticQQq¯q¯,QQq¯s¯

Cited by 126 publications

References 44 publications

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯dKarliner1, Rosner2 2017Phys. Rev. Lett.338222434View full textAdd to dashboardCite

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯dKarliner1, Rosner2 2017Phys. Rev. Lett.338222434View full textAdd to dashboardCite

$$D^*\bar{D}^*$$ D ∗ D ¯ ∗ molecule interpretation of $$Z_c(4025)$$ Z c ( 4025 )

The hidden-charm pentaquark and tetraquark states

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Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯d
Karliner
¹
,
Rosner
²

2017
Phys. Rev. Lett.
338
22
243
4
View full text Add to dashboard Cite

Discovery of the Doubly Charmed Ξcc Baryon Implies a Stable bbu¯d
Karliner
¹
,
Rosner
²

2017
Phys. Rev. Lett.
338
22
243
4
View full text Add to dashboard Cite

$$D^\bar{D}^$$ D ∗ D ¯ ∗ molecule interpretation of $$Z_c(4025)$$ Z c ( 4025 )