On deusons or deuteronlike meson-meson bound states

Törnqvist, Nils A.

doi:10.1007/bf02734018

Cited by 105 publications

(143 citation statements)

References 22 publications

Supporting

Mentioning

139

Contrasting

Order By: Relevance

“…With the quark-pion interaction model, Törnqvist calculated the possible DD * and D * D * molecular states in Refs. [185,186]. Later, Dubynskiy and Voloshin also indicated the existence of a possible resonance around the DD * threshold [187,188].…”

Section: Exotic Statesmentioning

confidence: 99%

“…The proximity of their masses to the thresholds inspired molecular explanations of these structures [196,215,216,202,217,218,219,220,221,222,223,224,225,203,226,200,227,228,229,230,231,232,233,234,235,236,237,238,239]. With the refinement of the meson exchange model, many subtle aspects of this framework were investigated, such as the S-D wave mixing effect [185,197], coupled-channel effect [240,241,242], and recoil correction [243,244].…”

Section: The Meson Exchange Modelmentioning

confidence: 99%

See 1 more Smart Citation

The hidden-charm pentaquark and tetraquark states

et al. 2016

View full text Add to dashboard Cite

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.

show abstract

Section: Exotic Statesmentioning

confidence: 99%

Section: The Meson Exchange Modelmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The first, a molecular state, sometimes referred to as a deuson (38), is comprised of two charmed mesons bound together to form a molecule. These states are by nature loosely bound.…”

Section: Multiquark Statesmentioning

confidence: 99%

“…This close correspondence has led to considerable speculation that the X(3872) is a molecule-like bound state of a D 0 and aD * 0 meson (8,9,38,68,69,72). 14 The recent measurement of the D 0 mass implies a D * 0D0 binding energy of (0.6 ± 0.6) MeV/c 2 .…”

Section: X(3872)mentioning

confidence: 99%

The Exotic XYZ Charmonium-Like Mesons

Godfrey

Olsen

2008

Annu. Rev. Nucl. Part. Sci.

296

254

View full text Add to dashboard Cite

Charmonium, the spectroscopy of cc mesons, has recently enjoyed a renaissance with the discovery of several missing states and a number of unexpected charmonium-like resonances. The discovery of these new states has been made possible by the extremely large data samples made available by the B-factories at the Stanford Linear Accelerator Center and at KEK in Japan, and at the CESR e + e − collider at Cornell. Conventional cc states are well described by quark potential models. However, many of these newly discovered charmonium-like mesons do not seem to fit into the conventional cc spectrum. There is growing evidence that at least some of these new states are exotic, i.e. new forms of hadronic matter such as mesonic-molecules, tetraquarks, and/or hybrid mesons. In this review we describe expectations for the properties of conventional charmonium states and the predictions for molecules, tetraquarks and hybrids and the various processes that can be used to produce them. We examine the evidence for the new candidate exotic mesons, possible explanations, and experimental measurements that might shed further light on the nature these states.

show abstract

“…Diquark molecules, also called deusons, are a pair of loosely bound charmed mesons [26]. While predictions for states of this sort have existed for some time, it is only in light of recent evidence from the B Factory experiments(described in Section 2.5) that they have been closely re-evaluated.…”

Section: Exotic Quarkoniamentioning

confidence: 99%

A Study of B→c$\bar{c}$γK in the BaBar Experiment

Fulsom

2009

View full text Add to dashboard Cite

The BABAR Collaboration is a high energy physics experiment located at the Stanford Linear Accelerator Center. The primary goal of the experiment is to study charge and parity violation in the B-meson sector, however the copious production of B mesons decaying to other final states allows for a wide-ranging physics program. In particular, one can access the charmonium system via colour-suppressed b → c decays of the type B → ccK.This thesis presents a study of B → ccγK decays where cc includes J/ψ and ψ(2S), and K includes K ± , K 0 S and K * (892). The particular emphasis is on a search for the radiative decays X(3872) → J/ψ γ and X(3872) → ψ(2S)γ. The X(3872) state is a recently-discovered resonance of undetermined quark composition, speculatively a conventional charmonium state or exotic four-quark di-meson molecule. This research is also sensitive to the well-known radiative charmonium decays B → χ c1,2 K, which are used as verification for the analysis technique.This dissertation sets the best B → χ c1 K branching fraction measurements to date, and sees the first evidence for factorization-suppressed B 0 → χ c2 K * 0 decay at a level of 3.6σ. It also provides evidence for X(3872) → J/ψγ and X(3872) → ψ(2S)γ with 3.6σ and 3.3σ significance, respectively.The product of branching fractions B(B ± → X(3872)K ± ) · B(X(3872) → J/ψγ) = (2.8 ± 0.8(stat.) ± 0.2(syst.)) × 10 −6 and B(B ± → X(3872)K ± ) · B(X(3872) → ψ(2S)γ) = (9.5 ± 2.7(stat.) ± 0.9(syst.)) × 10 −6 are measured.These results improve upon previous X(3872) → J/ψ γ measurements, and represent the first evidence for X(3872) → ψ(2S)γ.

show abstract

On deusons or deuteronlike meson-meson bound states

Cited by 105 publications

References 22 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

The Exotic XYZ Charmonium-Like Mesons

A Study of B→c$\bar{c}$γK in the BaBar Experiment

Contact Info

Product

Resources

About