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1-32 Radially Excited Axial Mesons and the Enigmatic Zc and Zb in a Coupled-channel Model

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IMP & HIRFL Annual Report 2015年第1期 41-42页

作者： susana coito 不详

The enigmatic charged states Zc(3900), Zc(4020), Zc(4050), Zb(10610), and Zb(10650) are studied within a coupled-channel Schr¨odinger model[1], where radially excited quark-antiquark (qˉq) pairs, with the same angular momenta and isospin as the a1(1260) and b1(1235), are strongly coupled to their Okubo-Zweig-Iizuka - allowed de-cay channels DˉD+ ˉDD and DˉD, or BˉB+ ˉBB and BˉB, in S and D-wave. Poles, matching the experimental mass and width of all the above states, are found by varying only two free parameters.

关键词： Radially Excited Axial

1-27 Unquenched Quark-model Calculation of Excited p Resonances and P-wave Phase Shifts

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IMP & HIRFL Annual Report 2015年第1期 38-38页

作者： susana coito G. Rupp E. van Beveren 不详

In Ref. [1], (770) vector resonance, its radial recurrences, and the corresponding P-wave phase shifts were investigated in an unquenched quark model with all classes of relevant decay channels included, viz. pseudoscalarpseudoscalar,vector-pseudoscalar, vector-vector, vector-scalar, axialvector-pseudoscalar, and axialvector-vector, totalling26 channels.

关键词： Unquenched Quark-model Calculation

1-31 Unquenching Weak Substructure

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IMP & HIRFL Annual Report 2015年第1期 41-41页

作者： susana coito E. van Beveren G. Rupp 不详

On assuming that weak substructure has a dynamics which is similar to quantum chromodynamics but much stronger, we conclude that unquenching is indispensable for predictions on the spectrum of weak-substructure resona... 详细信息

关键词： Unquenching Weak Substructure

1-29 On the Existence of a Superlight Scalar Boson

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IMP & HIRFL Annual Report 2015年第1期 39-39页

作者： susana coito E. van Beveren G. Rupp 不详

We report on an unexplained high statistics signal that may indicate the existence of a superlight scalar boson[1].The question whether there exists a (scalar) boson with a mass of about 38 MeV does not depend exclusively on the existence of a resonance-like structure(Fig. 1) in the experimental data of Ref. [2], yet it is at present the clearest signal we have found in many experiments.

关键词： Existence Superlight Scalar

1-28 Study of Meson Spectroscopy within S-matrix Approach

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IMP & HIRFL Annual Report 2015年第1期 38-39页

作者： susana coito G. Rupp E. van Beveren 不详

The main goal of meson spectroscopy is to understand the confining force, assumed to be based on low-energy QCD. The usual quark models ignore the dynamical effects of qˉq creation and decay. Recent lattice calculations confirm the much earlier model results showing that neglecting such effects, in the so-called quenched approximation, may give rise to large discrepancies, and so distort the meson spectra resulting from quark confinement only.

关键词： Meson Spectroscopy Approach

1-30 Using X(3823)->J= +.. to Identify Coupled-channel Effects

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IMP & HIRFL Annual Report 2015年第1期 40-40页

作者： susana coito Wang Bo Xu Hao Liu Xiang Chen Dianyong E. Eichten 不详

Very recently, the Belle and BESIII experiments observed a new charmonium-like state X(3823), which is a good candidate for the D-wave charmonium (13D2). Because the X(3823) is just near the DˉD threshold, the decay X(3823) ! J= +?? can be a golden channel to test the significance of coupled-channel effects. In this work[1], this decay is considered including both the hidden-charm dipion and the usual quantum chromodynamics multipole expansion (QCDME) contributions.

关键词： Identify Coupled-channel Effects