The<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mn>2</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>assignment for 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>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>

Burns, Timothy J.; Piccinini, F.; Polosa, A. D.; Sabelli, C.

doi:10.1103/physrevd.82.074003

Cited by 60 publications

(71 citation statements)

References 42 publications

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“…Discrepancies of this size in e + e − collisions at LEP were considered reasonably close to the measurements and do not justify rejecting the MC altogether [336]. Finally, contends [335], the deuteron is a system qualitatively different from a D * 0D0 molecule because the D 0 is spinless and cannot participate in spin interactions. Conversely, spin interactions play an important role in the determination of the deuteron binding: the spin-singlet deuteron and its isospin partner, the dineutron, are not bound.…”

Section: Questioning the X(3872) Molecular Interpretationmentioning

confidence: 93%

“…Fundamentally, a loosely bound S-wave molecule does not satisfy the minimum uncertainty principle, ∆r∆k ∼ 1. Instead, it maximizes the uncertainty, satisfying ∆r∆k 1 with ∆r ∼ k A rebuttal to [333] has been made [335]. It argues that the deuteron and X(3872) are not comparable.…”

Section: Questioning the X(3872) Molecular Interpretationmentioning

confidence: 99%

“…A D * 0D0 2 −+ state would require a relative P -wave. It is unlikely [335], that π-exchange could bind such a state, given that, even in an S-wave configuration, it is not clear that the attraction is sufficiently strong. Even if such a state exists, there remains the further problem that unless spindependent forces prevent the binding, one should expect partner states with 0 −+ and (J P C -exotic) 1 −+ , for which there is no experimental evidence.…”

Section: Questioning the X(3872) Molecular Interpretationmentioning

confidence: 99%

See 2 more Smart Citations

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

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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: Questioning the X(3872) Molecular Interpretationmentioning

confidence: 93%

Section: Questioning the X(3872) Molecular Interpretationmentioning

confidence: 99%

Section: Questioning the X(3872) Molecular Interpretationmentioning

confidence: 99%

See 1 more Smart Citation

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

Self Cite

103

View full text Add to dashboard Cite

show abstract

“…The quantum numbers of the X(3872), both J PC = 2 −+ and 1 ++ , were discussed by Burns, Piccinini, Polosa, and Sabelli in Ref. [570]. According to the prediction for the charged partner of the X(3872) in Ref.…”

Section: Molecular Schemementioning

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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“…Another very interesting alternative is the channel D +D * → J/ψ + ρ [14] where as a "molecular" bound state of D andD * with binding energy below 1 MeV the exotic state X(3872) is discussed [7,41,42] which was recently discovered by BaBar [43] and subsequently confirmed by other experiments.…”

Section: Introductionmentioning

confidence: 99%

Quantum mechanical model for J/ψ suppression in the LHC era

Peña

Blaschke

2014

Nuclear Physics A

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We discuss the interplay of screening, absorption and regeneration effects, on the quantum mechanical evolution of quarkonia states, within a time-dependent harmonic oscillator (THO) model with complex oscillator strength. We compare the results with data for R AA /R AA (CNM) from CERN and RHIC experiments. In the absence of a measurement of cold nuclear matter (CNM) effects at LHC we estimate their role and interpret the recent data from the ALICE experiment. We also discuss the temperature dependence of the real and imaginary parts of the oscillator frequency which stand for screening and absorption/regeneration, respectively. We point out that a structure in the J/ψ suppression pattern for In-In collisions at SPS is possibly related to the recently found X(3872) state in the charmonium spectrum. Theoretical support for this hypothesis comes from the cluster expansion of the plasma Hamiltonian for heavy quarkonia in a strongly correlated medium.

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The2−+assignment for theX(3872)

Cited by 60 publications

References 42 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

The hidden-charm pentaquark and tetraquark states

Quantum mechanical model for J/ψ suppression in the LHC era

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