Light-meson spectroscopy

Godfrey, Stephen; Napolitano, J.

doi:10.1103/revmodphys.71.1411

Cited by 231 publications

(223 citation statements)

References 385 publications

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“…[29,30,31]). It has been suggested that the light scalars below or near 1 GeVthe isoscalars f 0 (600) (or σ), f 0 (980), the isodoublet K * 0 (800) (or κ) and the isovector a 0 (980)-form an SU(3) flavor nonet, while scalar mesons above 1 GeV, namely, f 0 (1370), a 0 (1450), K * 0 (1430) and f 0 (1500)/f 0 (1710), form another nonet.…”

Section: Quark Structure Of F 0 (980) and Input Parametersmentioning

confidence: 99%

B→f0(980)Kdecays and subleading corrections

Cheng

Yang

2005

Phys. Rev. D

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The decay B → f 0 (980)K is studied within the framework of QCD factorization and the twoquark scenario for f 0 (980). There are two distinct penguin contributions and their interference depends on the unknown mixing angle θ of strange and nonstrange quark contents of f 0 (980): destructive for 0 < θ < π/2 and constructive for π/2 < θ < π. The QCD sum rule method is applied to evaluate the leading-twist light-cone distribution amplitudes and the scalar decay constant of f 0 . We conclude that the short-distance approach is not adequate to explain the observed large rates of f 0 K − and f 0 K 0 . Among many possible subleading corrections, we study and estimate the contributions from the three-parton Fock states of the f 0 and from the intrinsic gluon inside the B meson. It is found that the spectator gluon of the B meson may play an eminent role for the enhancement of f 0 (980)K. We point out that if f 0 (980) is a four-quark state as widely perceived, there will exist extra diagrams contributing to B → f 0 (980)K. However, in practice it is difficult to make quantitative predictions based on the four-quark picture for f 0 (980) as it involves additional nonfactorizable contributions that are difficult to estimate and the calculations of the decay constant and form factors of f 0 (980) are beyond the conventional quark model.

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Section: Quark Structure Of F 0 (980) and Input Parametersmentioning

confidence: 99%

B→f0(980)Kdecays and subleading corrections

Cheng

Yang

2005

Phys. Rev. D

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“…they can be constituents of molecular states with total widths of a few hundred MeV. The possibility has also been discussed elsewhere [17]. In this work, we investigate whether the present data on π 1 (1400) and π 1 (1600) support this specific molecular hypothesis.…”

Section: Introductionmentioning

confidence: 64%

Molecular states and1−+exotic mesons

Zhang

Ding

et al. 2002

Phys. Rev. D

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This work investigates whether the observed 1 −+ exotic mesons are molecular states. We first use a potential model to calculate the spectra and lifetimes of the f 0 (980) and a 0 (980), taken to be loosely bound molecular states of KK, then apply the same scenario to the 1 −+ exotic states π 1 (1400) and π 1 (1600), assuming them to be πη(1295) and πη(1440) molecules respectively. We derive the effective potential in the framework of field theory at the hadronic level. Our results indicate that the present data on π 1 (1400) and π 1 (1600) rule out the specific molecular ansatz. We show that the lifetime of a loosely bound heavy-light molecule with enough angular momentum is fully determined by the lifetimes of its constituent mesons.

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“…These states have a fundamental role for the understanding of strong interaction since they are sensitive to chiral symmetry breaking and vacuum condensate effects. In addition, they allow us to probe the strong force at large distances where linear qq potential leading to confinement is expected to arise as indicated by Lattice QCD calculations [5].…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Meson Spectroscopy in the Light Quark Sector

Vita

2014

EPJ Web of Conferences

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Abstract. Understanding the hadron spectrum is one of the fundamental issues in modern particle physics. We know that existing hadron configurations include baryons, made of three quarks, and mesons, made of quark-antiquark pairs. However most of the mass of the hadrons is not due to the mass of these elementary constituents but to their binding force. Studying the hadron spectrum is therefore a tool to understand one of the fundamental forces in nature, the strong force, and Quantum Chromo Dynamics (QCD), the theory that describes it. This investigation can provide an answer to fundamental questions as what is the origin of the mass of hadrons, what is the origin of quark confinement, what are the relevant degrees of freedom to describe these complex systems and how the transition between the elementary constituents, quarks and gluons, and baryons and mesons occurs. In this field a key tool is given by meson spectroscopy. Mesons, being made by a quark and an anti-quark, are the simplest quark bound system and therefore the ideal benchmark to study the interaction between quarks and understand what the role of gluons is. In this investigation, it is fundamental to precisely determine the spectrum and properties of mesons but also to search for possible unconventional states beyond the qq configuration as tetraquarks (qqqq), hybrids (qqg) and glueballs. These states can be distinguished unambiguously from regular mesons when they have exotic quantum numbers, i.e. combinations of total angular momentum, spin and parity that are not allowed for qq states. These are called exotic quantum numbers and the corresponding states are referred to as exotics. The study of the meson spectrum and the search for exotics is among the goals of several experiments in the world that exploit different reaction processes, as e + e − annihilation, pp annihilation, pion scattering, proton-proton scattering and photo-production, to produce meson states. This intense effort is leading to a very rich phenomenology in this sector and, together with recent theoretical progress achieved with lattice QCD calculations, is providing crucial information to reach a deeper understanding of strong interaction. In these proceedings I will review the present status of meson spectroscopy in the light quark sector and the plans and perspectives for future experiments.

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Light-meson spectroscopy

Cited by 231 publications

References 385 publications

B→f0(980)Kdecays and subleading corrections

B→f0(980)Kdecays and subleading corrections

Molecular states and1−+exotic mesons

Meson Spectroscopy in the Light Quark Sector

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