Is X(3872) really a molecular state?

Liu, Yan‐Rui; Liu, Xiang; Deng, Wubing; Zhu, Shi-Lin

doi:10.1140/epjc/s10052-008-0640-4

Cited by 228 publications

(276 citation statements)

References 84 publications

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“…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%

“…The formation of the bound states relies on the competition between the kinetic energy and attractive potential of the system. In other words, the BB * meson pairs are easier and more likely to form a loosely bound molecular state than the DD * [220].…”

Section: Theoretical and Experimental Challengesmentioning

confidence: 99%

“…In the derivation of the OPE potential in the coordinate space, one generally keeps the principal value only when making the Fourier transformation to the scattering amplitude in the momentum space. The OPE potential of the DD * system not only oscillates but also decreases very slowly [220,226], which is an inherent uncertainty of the OBE model when the mass gap of the final and initial states in the crossed diagram is larger than the exchanged meson mass. The potential from the π meson exchange is…”

Section: A Short Summarymentioning

confidence: 99%

“…This is well-known in nuclear physics. Liu et al [220] performed a dynamical calculation of the D 0D * 0 system taking into account both the pion and sigma meson exchange potential. Their analysis disfavored the interpretation of the X(3872) as a loosely bound molecular state with the experimental D * Dπ coupling constant g = 0.59 and a reasonable cutoff around 1 GeV.…”

Section: Molecular Schemementioning

confidence: 99%

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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: The Meson Exchange Modelmentioning

confidence: 99%

Section: Theoretical and Experimental Challengesmentioning

confidence: 99%

Section: A Short Summarymentioning

confidence: 99%

Section: Molecular Schemementioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…Hence, the coefficient C = ±1 represent C-even and -odd parity respectively, which are different from that of Ref. [4,3,24], since we use normal convention of PDG [25] i.e. B 0 = db andB 0 =db.…”

Section: Wave Functionmentioning

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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Separation properties of novel and commercial polar stationary phases in hydrophilic interaction and reversed‐phase liquid chromatography mode

Bicker

Lindner³

2008

J of Separation Science

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Four novel nonionic polar stationary phases were synthesised by anchoring first 2-mercaptoethanol and 1-thioglycerol, respectively, onto vinylised silica (ME and TG packings) followed by an on-phase oxidation with excess hydrogen peroxide in aqueous medium which yielded sulphoxide analogues of the embedded sulphide groups, i. e. oxidised 2-mercaptoethanol (MEO) and oxidised 1-thioglycerol (TGO) packings. Chromatographic characteristics of these stationary phases were evaluated comparatively to three commercial so-called 'diol' columns. U-shaped response curves of retention factors of adenosine and guanosine with hydro-organic eluents containing 5-95% v/v ACN as well as noticeable CH(2)-increment selectivity demonstrated multimodal separation capabilities of the developed amphiphilic materials, i. e. columns can be operated both in hydrophilic interaction chromatography (HILIC) and in RP mode. Although the selector ligands were physico-chemically related, considerably differing retention and selectivity patterns were observed in the HILIC mode. Thereby the introduction of additional hydroxyl groups in the chromatographic ligand resulted in selectivity increments that were different from those obtained by sulphur oxidation. For example, a set of five vitamins delivered five different elution orders with the overall seven columns. A close examination of HILIC separations of nucleobases and nucleosides on the developed packings revealed that (i) the amount of ACN in the eluent adopts a pivotal role in adjusting retention, (ii) the linearity of the relationship log (retention factor) versus log (volume fraction of water in the eluent) increases with phase polarity in the range of 5-40% v/v water, (iii) the slopes are higher with solutes having more polar interactive sites, (iv) the van't Hoff plots are linear (range 15-45 degrees C) with negative retention enthalpy values DeltaH (-4.5 to -14.5 kJ/mol) and (v) the -DeltaH values tend to be higher with more polar phases and more polar analytes. Based on these data the HILIC retention mechanism is described to be composed of both partitioning and adsorption processes. Distinct types of polar interactive sites in the chromatographic ligands may generate mixed-mode HILIC separation conditions that may additionally be superimposed by surface silanol contributions.

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Is X(3872) really a molecular state?

Cited by 228 publications

References 84 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

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

Separation properties of novel and commercial polar stationary phases in hydrophilic interaction and reversed‐phase liquid chromatography mode

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Is X(3872) really a molecular state?

Cited by 228 publications

References 84 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

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

Separation properties of novel and commercial polar stationary phases in hydrophilic interaction and reversed‐phase liquid chromatography mode

Contact Info

Product

Resources

About

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