Reconciling the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4630</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>with the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4660</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>

Guo, Feng-Kun; Haidenbauer, J.; Hanhart, C.; Meißner, Ulf‐G.

doi:10.1103/physrevd.82.094008

Cited by 73 publications

(89 citation statements)

References 50 publications

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“…Another test is a search for the decay B + → K + Y η , which has been estimated [322] to have a branching fraction of ∼ 10 −3 . After accounting for the possibility of final state interactions in this picture, it has also been proposed [324] that the X(4630), which decays to Λ and π + π − J/ψ channels have shed light on the nature of the X. As for the Y (4660), the lineshape contains the important information.…”

Section: Molecules and Effective Field Theoriesmentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

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Section: Molecules and Effective Field Theoriesmentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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show abstract

“…In 2008, the Belle collaboration studied the exclusive process e + e − → + −21 MeV, respectively [19]. The Y (4660) and Y (4630) may be the same particle according to the uncertainties of the masses and widths (also the decay properties [20]). There have been several tentative assignments of the Y (4360) and Y (4660), such as the conventional charmonium states [21][22][23][24], baryonium state [25], molecular states or hadro-charmonium states [26][27][28][29][30][31], tetraquark states [32][33][34][35][36][37][38], etc.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the $$Z_c(4020)$$ Z c ( 4020 ) , $$Z_c(4025)$$ Z c ( 4025 ) , $$Y(4360)$$ Y ( 4360 ) , and $$Y(4660)$$ Y ( 4660 ) as vector tetraquark states with QCD sum rules

2014

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In this article, we distinguish the charge conjugations of the interpolating currents, calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion, and we study the masses and pole residues of the J PC = 1 −± hidden charmed tetraquark states with the QCD sum rules. We suggest a formulawith the effective mass M c = 1.8 GeV to estimate the energy scales of the QCD spectral densities of the hidden charmed tetraquark states, which works very well. The numerical results disfavor assigning the Z c (4020), Z c (4025), and Y (4360) as the diquark-antidiquark (with the Dirac-spinor structure C − Cγ μ ) type vector tetraquark states, and they favor assigning the Z c (4020), Z c (4025) as the diquark-antidiquark type 1 +− tetraquark states. While the masses of the tetraquark states with symbolic quark structures ccss and cc(uū + dd)/ √ 2 favor assigning the Y (4660) as the 1 −− diquark-antidiquark type tetraquark state, more experimental data are still needed to distinguish its quark constituents. There are no candidates for the positive charge conjugation vector tetraquark states; the predictions can be confronted with the experimental data in the future at the BESIII, LHCb and Belle-II.

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“…The explanations include conventional cc state [16,17], ψ(2S)f 0 (980) molecule [18][19][20], hadro-charmonium [21], tetraquark state [4,22,23] and baryonium [24]. Although the Y (4630) and Y (4660) were observed in different processes, the similar masses and widths suggest that they could be the same state, which is also discussed in many theoretical works [5,25,26]. Other related studies are also performed [27][28][29][30], and a comprehensive review can be found in Ref.…”

Section: Introductionmentioning

confidence: 96%

Role ofY(4630)in thepp¯→<

et al. 2016

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We investigate the charmed baryon production reaction pp → ΛcΛc in an effective Lagrangian approach. Besides the t-channel D 0 and D * 0 mesons exchanges, the s-channel Y (4630) meson exchange is taken into account. For the total cross sections, the D 0 and D * 0 mesons provide minor background contributions, while the Y (4630) state gives a clear peak structure with the magnitude of 10 µb at center of mass energy 4.63 GeV. Basing on the results, we suggest that the reaction of pp → ΛcΛc can be used to search for the 1 −− charmonium-like Y (4630) state, and our predictions can be tested in future by thePANDA facility.

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Reconciling theX(4630)with theY(4660)

Abstract: The Belle Collaboration observed an enhancement called X(4630) in the Λ

Cited by 73 publications

References 50 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

Analysis of the $$Z_c(4020)$$ Z c ( 4020 ) , $$Z_c(4025)$$ Z c ( 4025 ) , $$Y(4360)$$ Y ( 4360 ) , and $$Y(4660)$$ Y ( 4660 ) as vector tetraquark states with QCD sum rules

Role ofY(4630)in thepp¯→<

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