New States with Heavy Quarks

Karliner, Marek; Lipkin, Harry J.; Törnqvist, Nils A.

doi:10.1051/epjconf/20147000024

Cited by 10 publications

(13 citation statements)

References 22 publications

(16 reference statements)

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“…The upshot is that the Z c (3900) isovector resonance confirms and refines the estimates in [9,10] for the mass of the putativeBB * isoscalar bound state. This immediately lead to several predictions [11]: (a) two I = 0 narrow resonances X b in the bottomonium system, about 20 MeV below the correspondingBB * andB * B * thresholds; (b) an I = 1 resonance aboveD * D * threshold; (c) an I = 0 resonance nearD * D * threshold.…”

Section: First Observation Of Manifestly Exotic Hadronssupporting

confidence: 65%

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Pentaquarks and doubly heavy exotic mesons

Karliner

2016

EPJ Web Conf.

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Abstract. I discuss the experimental evidence for and theoretical interpretation of the new mesons and baryons with two heavy quarks. These include doubly-heavy baryons, exotic hadronic quarkonia and most recently a manifestly exotic pentaquark-like doubly heavy baryon with a minimal quark content uudc discovered by LHCb, whose mass, decay mode and width are in agreement with a prediction based on a physical picture of a deuteron-like Σ cD * "hadronic molecule". This strongly suggests a parallel with X(3872), whose mass is almost exactly at the D * D threshold. It also raises the possibility that such states might have a complementary description as deuteron-like "molecule" of two heavy mesons quasi-bound by pion exchange [5][6][7]. First observation of manifestly exotic hadronsThe 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. 1 In the bottom system the attraction due to π exchange is essentially the same, but the kinetic energy is much smaller by a factor of ∼m(B)/m(D)≈2.8 . Therefore the net binding in the bottom system is stronger than in the charm system. This expectation has been confirmed by the discovery by BESIII [8] of charged exotic charmonium Z c (3900) at 3899.0 ± 3.6 ± 4.9 MeV with Γ = 46 ± 10 ± 20 MeV, 27 MeV aboveDD * threshold. e-mail: marek@proton.tau.ac.il 1 For simplicity we treat X(3872) as an isoscalar, since it has no charged partners, and we ignore here the issue of isospin breaking in its decays. A more refined treatment results in the same conclusions.

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Section: First Observation Of Manifestly Exotic Hadronssupporting

confidence: 65%

“…[5]. They were later extensively discussed [6,7,9,10] in analogy with the deuteron which binds via exchange of pions and other light mesons, and were referred to as "deusons".…”

Section: First Observation Of Manifestly Exotic Hadronsmentioning

confidence: 99%

Pentaquarks and doubly heavy exotic mesons

Karliner

2016

EPJ Web Conf.

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“…dibaryon [34][35][36]. We emphasize that the pion-exchange binding mechanism can in principle apply to any two heavy hadrons which carry isospin and satisfy condition (c) above, be they mesons or baryons.…”

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confidence: 99%

New Exotic Meson and Baryon Resonances from Doubly Heavy Hadronic Molecules

2015

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We predict several new exotic doubly-heavy hadronic resonances, inferring from the observed exotic bottomonium-like and charmonium-like narrow states X(3872), Z b (10610), Z b (10650), Z c (3900), and Z c (4020/4025). We interpret the binding mechanism as mostly molecular-like isospin-exchange attraction between two heavy-light mesons in a relative S-wave state. We then generalize it to other systems containing two heavy hadrons which can couple through isospin exchange. The new predicted states include resonances in meson-meson, meson-baryon, baryon-baryon, and baryon-antibaryon channels. These include those giving rise to final states involving a heavy quark Q = c, b and antiquark

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“…Assuming that the isoscalar binding energy in the m Q → ∞ limit is 3 times larger than for the isovector, The upshot is that the newly discovered Z c (3900) isovector resonance confirms and refines the estimates in [9,10] for the mass of the putativeBB * isoscalar bound state. This immediately lead to several predictions [11] The X b states can most likely be observed through the decays X b → Υω or X b → χ b ππ.…”

Section: First Observation Of Manifestly Exotic Hadronsmentioning

confidence: 80%

“…The τ 1 · τ s isospin nature of the exchange implies that the the binding is 3 times stronger in the isoscalar channel. It was estimated [9,10] that in the bottomonium system this difference in the binding potentials raises the I=1 exotics well above the I=0 exotics.…”

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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New States with Heavy Quarks

Cited by 10 publications

References 22 publications

Pentaquarks and doubly heavy exotic mesons

Pentaquarks and doubly heavy exotic mesons

New Exotic Meson and Baryon Resonances from Doubly Heavy Hadronic Molecules

Heavy exotic quarkonia and doubly heavy baryons

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