Discovery of a Narrow Resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Annihilation

Augustin, J. E.; Boyarski, A. M.; Breidenbach, M.; Bulos, F.; Dakin, J.T.; Feldman, G. J.; Fischer, G.; Fryberger, D.; Hanson, G.; Jean‐Marie, B.; Larsen, R. R.; Lüth, V.; Lynch, H. L.; Lyon, D.; Morehouse, C. C.; Paterson, J. M.; Перл, М.; Richter, B.; Rapidis, P. A.; Schwitters, R. F.; Tanenbaum, W.; Vannucci, F.; Abrams, G. S.; Briggs, D.; Chinowsky, W.; Friedberg, C. E.; Goldhaber, G.; Hollebeek, R. J.; Kadyk, J. A.; Lulu, B. A.; Pierre, F.; Trilling, G. H.; Whitaker, J. S.; Wiss, J.; Zipse, J. E.

doi:10.1103/physrevlett.33.1406

Cited by 1,273 publications

(334 citation statements)

References 4 publications

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“…The latter experiment [90] and R Y = 0.7 +0. 4 −0.3 ± 0.1 and R NY = 0.7 ± 0.1 ± 0.1, which are both consistent with the previous results [97], and at the same time (almost) agree with the isospin expectation.…”

Section: +003supporting

confidence: 81%

“…The mass and width of the Y(4140) were measured slightly more precisely, to be M = (4143.4 +2.9 −3.0 ± 0.6) MeV and Γ = (15.3 +10. 4 −6.1 ± 2.5) MeV. They also extracted the relative branching fraction B rel to be …”

Section: Y(4140) and Y(4274)mentioning

confidence: 99%

“…The discovery of J/ψ [3,4] in 1974 inspired theorists to propose potential models [5,6]. The mass spectrum of the charmonium family was obtained by solving the Schrödinger equation.…”

Section: Quark Modelmentioning

confidence: 99%

“…We note that this is the "type-I" diquark-antidiquark model, and the "type-II" diquark-antidiquark model [385] has been reviewed in Sec. 4 In this model the hadron masses depend on three ingredients: quark composition, constituent quark masses and spin-spin interactions. The Hamiltonian is…”

Section: Molecular Schemementioning

confidence: 99%

“…3, and review the applications of more theoretical frameworks on the charmonium-like states in Sec. 4. An outlook and a brief summary will be given in Sec.…”

mentioning

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: +003supporting

confidence: 81%

Section: Y(4140) and Y(4274)mentioning

confidence: 99%

“…The discovery of J/ψ [3,4] in 1974 inspired theorists to propose potential models [5,6]. The mass spectrum of the charmonium family was obtained by solving the Schrödinger equation.…”

Section: Quark Modelmentioning

confidence: 99%

Section: Molecular Schemementioning

confidence: 99%

“…3, and review the applications of more theoretical frameworks on the charmonium-like states in Sec. 4. An outlook and a brief summary will be given in Sec.…”

mentioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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The discovery of quarks

Friedman

2001

Ann. Phys.

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In the period following World War II, there was a rapid development of particle physics. With the construction of synchrotrons and the development of detector technology, many new particles were discovered and the systematics of their interactions investigated. The invention of the bubble chamber played an especially important role in uncovering the rich array of hadrons that were discovered in this period. In 1961 Murray Gell‐Mann [1] and Yuval Ne'eman [2] independently introduced a classification scheme, based on SU(3) symmetry, which placed hadrons into families on the basis of spin and parity. Like the periodic table for the elements, this scheme was predictive as well as descriptive, and various hadrons, such as the Ω—, were predicted within this framework and were later discovered. In 1964 Gell‐Mann [3] and George Zweig [4] independently proposed quarks as the building blocks of hadrons as a way of generating the SU(3) classification scheme. When the quark model was first proposed, it postulated three types of quarks: up (u), down (d), and strange (s), with charges 2/3, —1/3, and —1/3 respectively. Each of these was hypothesized to be a spin1/2 particle. In this model the nucleon (and all other baryons) is made up of three quarks, and each meson consists of a quark and an antiquark. For example, as the proton and neutron both have ero strangeness, they are (u,u,d) and (d,d,u) systems respectively. Though the quark model provided the best available tool for understanding the properties of the hadrons that had been discovered at the time, the model was thought by many to be merely a mathematical representation of some deeper dynamics, but one of heuristic value. Among the reasons for this assessment were the following:free quarks had not been found though they had been sought in numerous accelerator and cosmic ray investigations and in searches in the terrestrial environment; there was a deep suspicion about the validity of their fractional charge assignments; and some of the baryon states constructed on the basis of the quark model violated the Pauli exclusion principle. Despite these difficulties there were a small number of theorists who continued to apply the model to explain a wide range of hadronic phenomena. The theory of hadron structure that was most widely accepted at the time was the bootstrap model, an approach based on S‐Matrix theory. This model, sometimes referred to as “nuclear democracy,” was based on the idea that there were no fundamental particles and that all hadrons are made up of one another. This picture was consistent with the low momentum transfer scattering seen in hadron‐hadron interactions and with the observed “soft” electromagnetic form factors of the proton and neutron; however, it could not provide the comprehensive description of multiplet structures that was given by the quark model. Inelastic electron‐nucleon scattering results, and later those from neutrino‐scattering, played a pivotal role in resolving this dilemma by firmly establishing the quark model. These ex...

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Strong Interaction

Karsch

Vogelsang

2009

Digital Encyclopedia of Applied Physics

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We present an introductory overview of the strong force, one of the four known fundamental forces in nature. We review the historical developments of strong interaction physics, which led to the formulation of quantum chromo dynamics (QCD), our accepted theory of strong interaction. We discuss the salient features of QCD, its experimental evidence, as well as some of the techniques used in QCD calculations.

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Discovery of a Narrow Resonance ine+e−Annihilation

Abstract: PHYSICAL REVIEW LETTERS

Cited by 1,273 publications

References 4 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

The discovery of quarks

Strong Interaction

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