Heavy quark spin structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Z</mml:mi><mml:mi>b</mml:mi></mml:msub></mml:math>resonances

Bondar, A.; Garmash, A.; Milstein, A. I.; Mizuk, R.; Voloshin, M.B.

doi:10.1103/physrevd.84.054010

Cited by 279 publications

(332 citation statements)

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“…Especially, they noticed that the bb pair within the Z b (10610) and Z b (10650) resonances is a mixture of a spin-triplet and a spin-singlet of equal amplitude [436]. Voloshin investigated their isoscalar analogs and proposed to observe them in the I G (J P ) = 0 − (1 + ) channel [437].…”

Section: Symmetry Analysismentioning

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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Section: Symmetry Analysismentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…The J P C quantum numbers of both states were determined as 1 +− [10] in line with the expectation of the molecular model. Within the molecular picture, the wave functions of the Z b states can be written as [7] 1 + (1 +− ) :…”

Section: Jhep06(2017)158mentioning

confidence: 99%

Spin partners of the Z b (10610) and Z b (10650) revisited

Baru

Epelbaum

Filin

et al. 2017

J. High Energ. Phys.

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We study the implications of the heavy-quark spin symmetry for the possible spin partners of the exotic states Z b (10610) and Z b (10650) in the spectrum of bottomonium. We formulate and solve numerically the coupled-channel equations for the Z b states that allow for a dynamical generation of these states as hadronic molecules. The force includes short-range contact terms and the one-pion exchange potential, both treated fully nonperturbatively. The strength of the potential at leading order is fixed completely by the pole positions of the Z b states so that the mass and the most prominent contributions to the width of the isovector heavy-quark spin partner states W bJ with the quantum numbers J ++ (J = 0, 1, 2) come out as predictions. In particular, we predict the existence of an isovector 2 ++ tensor state lying a few MeV below the B * B * threshold which should be detectable in the experiment. Since the accuracy of the present experimental data does not allow one to fix the pole positions of the Z b 's reliably enough, we also study the pole trajectories of their spin partner states as functions of the Z b binding energies. It is shown that, once the heavy-quark spin symmetry is broken by the physical B and B * mass difference, especially the pion tensor force has a significant impact on the location of the partner states clearly demonstrating the need of a coupled-channel treatment of pion dynamics to understand the spin multiplet pattern of hadronic molecules.

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“…The isoscalars BB, BB * (C = +), B * B * (J = 2) favor molecular states. Bondar et al also discussed the heavy quark spin structure of the Z b (10610) and Z b (10650) assuming that these are molecular state B * B and B * B * [8]. By considering the contribution from the intermediate Z b (10610) and Z b (10650) states to the Υ(5S) → Υ(2S)π + π − decay process, the anomalous Υ(2S)π + π − production near the peak of Υ(5S) at √ s = 10.87 GeV [9], observed by Belle collaboration, can be explained naturally [10].…”

Section: Introductionmentioning

confidence: 99%

Possible interpretation of theZ_b(10610) andZ_b(10650) in a chiral quark model

Yang

Ping

Deng

et al. 2012

J. Phys. G: Nucl. Part. Phys.

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Abstract. Motivated by the two charged bottomonium-like resonances Z b (10610) and Z b (10650) newly observed by the Belle collaboration, the possible molecular states composed of a pair of heavy mesons, BB, BB * , B * B * , B sB , etc (in S-wave), are investigated in the framework of chiral quark models by the Gaussian expansion method. The bound states BB * and B * B * with quantum numbers I(J P C ) = 1(1 +− ), which are good candidates for the Z b (10610) and Z b (10650) respectively, are obtained. Other three bound states BB * with I(J P C ) = 0(1 ++ ), B * B * with I(J P C ) = 1(0 ++ ), 0(2 ++ ) are predicted. These states may be observed in open-bottom or hiddenbottom decay channel of highly excited Υ. When extending directly the quark model to the hidden color channel of the multi-quark system, more deeply bound states are found. Future experimental search of those states will cast doubt on the validity of applying the chiral constituent quark model to the hidden color channel directly.

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Heavy quark spin structure inZbresonances

Cited by 279 publications

References 6 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Spin partners of the Z b (10610) and Z b (10650) revisited

Possible interpretation of theZ_b(10610) andZ_b(10650) in a chiral quark model

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Heavy quark spin structure inZbresonances

Cited by 279 publications

References 6 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Spin partners of the Z b (10610) and Z b (10650) revisited

Possible interpretation of theZb(10610) andZb(10650) in a chiral quark model

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Possible interpretation of theZ_b(10610) andZ_b(10650) in a chiral quark model