Evidence for a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi><mml:mo>=</mml:mo><mml:mn>0</mml:mn><mml:mn /></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>−</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Reson

Selove, W.; Hagopian, V.; Brody, H.; Baker, Adam; Leboy, E.

doi:10.1103/physrevlett.9.272

Cited by 104 publications

(13 citation statements)

References 6 publications

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“…F: The f 2 (1270) was introduced by Walter Selove as f meson to memorise his wife Fay Ajzenberg [78]. Fay herself is a well-known nuclear physicist awarded with 3 doctorates honoris causa.…”

Section: A Guide To the Literaturementioning

confidence: 99%

Glueballs, hybrids, multiquarks

2007

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Glueballs, hybrids and multiquark states are predicted as bound states in models guided by quantum chromo dynamics (QCD), by QCD sum rules or QCD on a lattice. Estimates for the (scalar) glueball ground state are in the mass range from 1000 to 1800 MeV, followed by a tensor and a pseudoscalar glueball at higher mass. Experiments have reported evidence for an abundance of meson resonances with 0 −+ , 0 ++ and 2 ++ quantum numbers. In particular, the sector of scalar mesons is full of surprises starting from the elusive and mesons. The a 0 (980) and f 0 (980), discussed extensively in the literature, are reviewed with emphasis on their Janus-like appearance as KK molecules, tetraquark states or qq mesons. Most exciting is the possibility that the three mesons f 0 (1370), f 0 (1500), and f 0 (1710) might reflect the appearance of a scalar glueball in the world of quarkonia. However, the existence of f 0 (1370) is not beyond doubt and there is evidence that both f 0 (1500) and f 0 (1710) are flavour octet states, possibly in a tetraquark composition. We suggest a scheme in which the scalar glueball is dissolved into the wide background into which all scalar flavour-singlet mesons collapse.There is an abundance of meson resonances with the quantum numbers of the . Three states are reported below 1.5 GeV/c 2 whereas quark models expect only one, perhaps two. One of these states, (1440), was the prime glueball candidate for a long time. We show that (1440) is the first radial excitation of the meson.Hybrids may have exotic quantum numbers which are not accessible by qq mesons. There are several claims for J P C = 1 −+ exotics, some of them with properties as predicted from the flux tube model interpreting the quark-antiquark binding by a gluon string. The evidence for these states depends partly on the assumption that meson-meson interactions are dominated by s-channel resonances. Hybrids with non-exotic quantum numbers should appear as additional states. Light-quark mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers. Two states do not fall under this classification. They are discussed as hybrid candidates.The concept of multiquark states has received revived interest due to new resonances in the spectrum of states with open and hidden charm. The new states are surprisingly narrow and their masses and their decay modes often do not agree with simple quark-model expectations.Lattice gauge theories have made strong claims that glueballs and hybrids should appear in the meson spectrum. However, the existence of a scalar glueball, at least with a reasonable width, is highly questionable. It is possible that hybrids will turn up in complex multibody final states even though so far, no convincing case has been made for them by experimental data. Lattice gauge theories fail to identify the nonet of scalar mesons. Thus, at the present status of approximations, lattice gauge theories seem not to provide a trustworthy guide into unknown territory ...

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Section: A Guide To the Literaturementioning

confidence: 99%

Glueballs, hybrids, multiquarks

2007

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“…This seems to establish the T=Y=O series of mesons '1}, m, lp, f, (1) which exhibits the following remarkable· regularities. …”

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confidence: 85%

The Isosinglet Meson Series

Takabayasi

Ohnuki

1963

Prog. Theor. Phys.

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Recent experiments indicate the existences of iso-singlet 1r+ -1r-resonance 1 ) f and K-K resonance 2 ) lp, whose masses and reasonably assigned quantum numbers are listed in Table I. This seems to establish the T=Y=O series of mesons '1}, m, lp, f, (1) which exhibits the following remarkable· regularities. Table I. T= Y=O I mass I baryonmesons (Mev) JPG n anti baryon state 71 I 548 o-+ 1 I 'So Ql I 782 1--2 I •s, (/)(a) The mass spectrum of (1) obeys a complete equal-interval rule such thatwhere n is the ordering number ranging from 1 to 4 for each successive level in the series (1), andEquation (2) reproduces the observed masses of those four mesons within a few Mev, and moreover suggests that the possible level corresponding to n=O with the ~ass value (4) may be identified with the ABC-particle.3) (b) The charge-parity C for any state of (1), which is identical with the Gparity in this case, is connected with the spin J by (5) Since the relation (5) holds for photons also, we conjecture that it represents a general connection valid for any possible self-conjugate bosons. Equation (5) may be extended to include T=1 states 1r and p mesons such that*)Equation (2) is essentially a linear oscillator formula with the energy quantum A: and the "principal quantum number" n.This n is related with JPG but is not uniquely determined by the latter. Indeed the doubling of 1--mesons m and lfJ represents a novel situation where all the usual quantum numbers are common but masses are distinct. Our n just serves to play the role of the new quantum number to distinguish between m and lp, pointing to the presence of a certain internal structure for the states. A direct interpretation of the formula (2) in terms of an oscillator model, however, would raise difficulty because of the particular correlation of n with JPG.A simple model which allows correct JPG assignments and accords with (2) for all the states of (1) is obtained by assuming those mesons to be tightly bound states of baryon and anti-baryon pair, following Sakata.s) It is well known6) that by identifying ' 1J and m with 1 S0 and 3 S1 states of NN and/or AA system, respectively, their quantum numbers are correctly reproduced. We now introduce an additional assumption that the f-meson is the 3 P 2 state of the same system and the masses are given for those three states by the formula *> It is to -be noted that (6) is analc>ge>us to the rule4) P= ( -1)J-T, which restricted possible non-strange baryon states, i.e. nucleon and its resonances.

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“…F i n a l l y , t h e r e i s one f u r t h e r meson, whose r o l e a , p p e a r s I t o b e r a t h e r a m y s t e r y a t p r e s e n t . T h i s i s t h e K o r K-meson of mass 3 7 2 5 MeV, which h a s b e e n o b s e r v e d i n p o s i t i v e and n e u t r a l c h a r g e s t a t e s , as w e l l as i n t h e c o r r e s p o n d i n g a n t i p a r t i c l e s t a t e s , …”

Section: * T H I S Work S U P P O R T E D By T H E U S Atomic Enermentioning

confidence: 99%

The Systematics of Baryon and Meson States

Dalitz¹

1963

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Evidence for aT=0π+−π−Reson

Cited by 104 publications

References 6 publications

Glueballs, hybrids, multiquarks

Glueballs, hybrids, multiquarks

The Isosinglet Meson Series

The Systematics of Baryon and Meson States

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