The End of the Constituent Quark Model?

Close, Frank

doi:10.1063/1.1799819

Cited by 31 publications

(35 citation statements)

References 7 publications

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“…Here we show that some features of exotic baryons spectra obtained within the chiral soliton approach can be illustrated in terms of the quark model, as it was shown at first [45] for the case of antidecuplet. Any model with SU(3) flavor symmetry and its violation in special way mimics the quark model in view of Gell-Mann -Okubo type relations (section 2).…”

Section: Quark Wave Functions Of Pentaquarksmentioning

confidence: 94%

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Baryon spectrum in largeNcchiral soliton and in quark models

Kopeliovich

Shunderuk

2006

Phys. Rev. D

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In memory of Karen Avetovich Ter-Martirosyan, the Teacher. IntroductionDescription of hadrons structure in terms of their quark constituents is generally accepted, but the alternative description within e.g. topological soliton (Skyrme) model [1,2] and its modifications also is useful and has certain advantages in comparison with traditional approaches. The chiral (topological) soliton approach is based on general principles and few ingredients incorporated in the effective chiral lagrangian, this is the reason for apparent simplifications in comparison, for example, with attempts to solve relativistic many-body problem. To simplify the latter, some additional objects like diquarks and triquarks have been phenomenologically introduced and discussed especially intensively after recent observations of the so called pentaquarks [3,4] 1 . Concept of diquarks "as an organizing principle for hadron spectroscopy" is considered in details in [12], see also [13]. The concepts of diquarks, triquarks or other correlated quark clusters are certainly of useful heuristic value, although their properties have not been deduced rigorously from basic QCD lagrangian. It should be noted that diquarks present in different physical states, baryons or mesons, can have different properties like the effective mass and size, even for same quantum numbers. 2In the present paper we perform explicit calculation of the strangeness contents of exotic and nonexotic baryon states at arbitrary number of colors N c , and discuss connection of the chiral soliton approach (CSA) and simple quark (pentaquark) model for exotic baryon states, 1 A contradictive present situation with experimental observation of possible pentaquark states is discussed, e.g. in [5,6]. Consideration of baryon states in the present paper is relevant independently on particular values of masses, widths and other properties of exotic baryon states measured experimentally. A detailed discussion of theoretical predictions of these states can be found in [7,8,9,10,11] 2 Some analogy with nuclei can be noted: two-, three-, etc. nucleon clusters play an important role in the structure of heavy nuclei, however, it is not possible to evaluate their properties from those of deuteron, helium etc., only. See, e.g. [14] for discussion of the role of femtometer toroidal structures in nuclei.

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Section: Quark Wave Functions Of Pentaquarksmentioning

confidence: 94%

“…In the model with3 F diquarks [4,45] the flavor part of the wave function of Θ + is made of two isoscalar diquarks:…”

Section: Quark Contents Of Exotic Baryons In Pentaquark Approximationmentioning

confidence: 99%

Baryon spectrum in largeNcchiral soliton and in quark models

Kopeliovich

Shunderuk

2006

Phys. Rev. D

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“…There is only one state that has been firmly established by different collaborations and whose properties seem to be hardly accommodated in the quark-antiquark scheme, this is the X(3872) [7]. Regarding the zoo of other states that have been proposed, we have to stay tuned but also be cautious [11,12]. Some members of this XY Z jungle are awaiting confirmation, seen only by one collaboration, like the intriguing charged state Z(4430), seen by Belle but not by BABAR [15].…”

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confidence: 99%

“…It is remarkable the case of J P C = 1 ++ for Q = c, where the (QQ) − (nn) and the (Qn) − (nQ) twomeson states are almost degenerate. The reverse of the ordering of the masses of the (QQ) − (nn) and (Qn) − (nQ) thresholds when increasing the mass of the heavy quark for all J P C quantum numbers can be simply understood within the constituent quark model with a Cornell-like potential [11]. The binding of a coulombic system is proportional to the reduced mass of the interacting particles.…”

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confidence: 99%

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Too many X’s, Y’s and Z’s?

2012

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The discoveries in 1974 of the so-called November revolution [1], as the name 'revolution' implies, were not just additions to our knowledge of nature. Instead they signalled a change in our understanding of the structure of matter. Of course, this change did not occur completely overnight. Many of the ideas were there before, accepted by some and doubted by others. As always, there were also plenty of wrong ideas and irrelevant pieces of information. Why were these discoveries so exciting and so significant? First, because those particles were made of an unknown charm quark, and second because the spectrum of such particles could be studied with great precision and it was just the spectrum one would expect on the basis of

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