Possible large deuteronlike meson-meson states bound by pions

Törnqvist, Nils A.

doi:10.1103/physrevlett.67.556

Cited by 292 publications

(370 citation statements)

References 15 publications

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“…The mass of the molecular state would be less than the sum of the mass of two mesons. The smaller is the binding energy, the larger is the stability of the system [13][14][15]. Here we briefly study the light di-mesonic masses by semi relativistic approach.…”

Section: Introductionmentioning

confidence: 99%

Masses of di-mesonic molecular states

Rathaud

Kumar

2015

EPJ Web of Conferences

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Section: Introductionmentioning

confidence: 99%

Masses of di-mesonic molecular states

Rathaud

Kumar

2015

EPJ Web of Conferences

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“…First page of our paper [2] proposing a four-quark exotic intermediate state bbud as an explanation of the anomalously large rate partial widths of Υ(5S ) → Υ(2S ) and Υ(5S ) → Υ(1S ). mesons quasi-bound by pion exchange [6][7][8], as schematically shown in Figure 2 The attraction due to π exchange is 3 times weaker in the I=1 channel than in the I= 0 channel. Consequently, in the charm system the I=1 state is expected to be well above the D * D threshold and the I=0 X(3872) is at the threshold.…”

Section: First Observation Of Manifestly Exotic Hadronsmentioning

confidence: 99%

Heavy exotic quarkonia and doubly heavy baryons

Karliner

2015

EPJ Web of Conferences

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Abstract. During the last three years strong experimental evidence from B and charm factories has been accumulating for the existence of exotic hadronic quarkonia, narrow resonances which cannot be made from a quark and an antiquark. Their masses and decay modes show that they contain a heavy quark-antiquark pair, but their quantum numbers are such that they must also contain a light quark-antiquark pair. The main theoretical challenge has been to determine the nature of these resonances. The main possibilities are that they are either "genuine tetraquarks", i.e. two quarks and two antiquarks within one confinement volume, or "hadronic molecules" of two heavy-light mesons. In the last few months there is more and more evidence in favor of the latter. In addition, there exist narrow resonances such as X(3872) which are not exotic but are closely related to the exotic states. Most likely such states are a mixture of hadronic molecules and excited quarkonia. I discuss the experimental data and its interpretation and provide fairly precise predictions for masses and quantum numbers of the additional exotic states which are naturally expected in the molecular picture but have yet to be observed. In addition, I provide arguments in favor of the existence of an even more exotic state -a hypothetical deuteron-like bound state of two heavy baryons. I also consider "baryon-like" states QQ qq , which if found will be direct evidence not just for near-threshold binding of two heavy mesons, but for genuine tetraquarks with novel color networks. I also stress the importance of experimental search for doubly-heavy baryons which are intimately connected with doubly heavy exotics. First observation of manifestly exotic hadronsIn The attraction due to π exchange is 3 times weaker in the I=1 channel than in the I= 0 channel. Consequently, in the charm system the I=1 state is expected to be well above the D * D threshold and the I=0 X(3872) is at the

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“…Such a picture, together with the absence of long-range forces [17] in a charmoniumlight two-meson system, may imply different consequences for the existence of molecules close to the meson-antimeson threshold. First, the possible existence of such molecules in the hidden-strange sector.…”

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confidence: 99%

“…However, the coupling to the lower channel, Υ ω, destroys any possibility of having a bound state. Thus, based on the constituent quark model ideas, one should not expect a twin of the X(3872) in bottomonium spectroscopy like those pointed out in hadronic models based on the traditional meson theory of the nuclear forces or resorting to heavy quark symmetry arguments [17]. Finally, the coupling to channels containing the light pion destroys the degeneracy between meson-antimeson and charmonium-light two-meson thresholds, an important mechanism for binding four-quark states in the I = 0 sector.…”

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confidence: 99%

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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Possible large deuteronlike meson-meson states bound by pions

Cited by 292 publications

References 15 publications

Masses of di-mesonic molecular states

Masses of di-mesonic molecular states

Heavy exotic quarkonia and doubly heavy baryons

Too many X’s, Y’s and Z’s?

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