Publisher’s Note: Search for the rare charmless hadronic decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>a</mml:mi><mml:mn>0</mml:mn><mml:mo>+</mml:mo></mml:msubsup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>[Phys. Rev. D<b>77</b>, 011101 (2008)]

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doi:10.1103/physrevd.77.019904

Cited by 19 publications

(29 citation statements)

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“…He predicted: its quantum numbers to be J PC = 0 −+ or 1 ++ ; a width of order 50 keV; and a strong decay mode to be D 0D0 π 0 via D 0D * 0 . What we now know about the X(3872) aligns well with Törnqvist's predictions: LHCb established its J PC to be unambiguously 1 ++ [8,9]; Belle placed an upper limit on its width of 1.2 MeV [1]; and both Belle & BaBar have reported that X(3872) → D 0D0 π 0 is the dominant decay mode [10][11][12], with a branching fraction that is greater than 40% [4].…”

supporting

confidence: 74%

The XYZ mesons: what they aren’t

Olsen

2019

EPJ Web Conf.

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I discuss the properties of some representative XYZ mesons in the context of the most commonly proposed models for their underlying nature. Some recent historyThe study of hadron spectroscopy had enormous success in the latter part of the twentieth century, when the charmonium (cc) and bottomonium (bb) mesons were discovered and it was established that the mass spectra of these states, and many of their properties, could be accurately described by the Quarkonium model, which is based on non-relativistic Quantum Mechanics with a simple potential comprised of a coulombic short-ranged component smoothly coupled to a linearly rising "confining" term at larger distances. Figure 1 shows the status of the charmonium spectrum in 2003, where the established charmonium mesons are colored yellow and the predicted but at that time unassigned states are gray. The assigned mesons all have properties that closely match their model-based expectations. Moreover, exceptions, i.e., cc mesons that could not be accommodated by this simple picture, were not seen. At the turn of the century, which coincided with the first operation of the PEPII/BaBar and KEKB/Belle "B-factory" experiments, it was generally thought that one of the tasks for early twenty-first century experiments would be the fleshing out some of the remaining unassigned charmonium (and bottomonium) levels.One of the big surprises from the B-factory experiments was the discovery of mesons with decay final states that include a c-and ac-quark that cannot be assigned to any of the remaining unassigned levels of the charmonium spectrum. The first of these charmoniumlike 1 states to be observed was the X(3872) that was seen by Belle as a distinct narrow peak in the π + π − J/ψ invariant mass distribution in B → Kπ + π − J/ψ decays [2] (see Fig. 2). The J/ψ in its decay final state is a clear indication that the X(3872), whatever it is, must contain a c-andc-quark. 2 Although the original Belle report was based on only ∼36 signal events, it established two properties of the X(3872) that ruled against its interpretation as a two-quark, cc charmonium state: i) its mass, reported at that time to be M X(3872) = 3872.0 ± 0.8 MeV and shown as a green horizontal line in Fig. 1, was a poor match to expectations for any of the unassigned cc charmonium states at that time; ii) the π + π − invariant mass peaked near the M X(3872) − m J/ψ ≈ 775 MeV kinematic boundary, * e-mail: solsen@ucas.ac.cn 1 Charmoniumlike is used to designate states that appear to contain a c-andc-quark but have properties that do not match expectations for a cc charmonium level. 2 The large mass of the c-quark ensures that the probability for the production of a cc pair from the vacuum during the quark to hadron fragmentation process is negligibly small.

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supporting

confidence: 74%

The XYZ mesons: what they aren’t

Olsen

2019

EPJ Web Conf.

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“…Although the BABAR Collaboration also gives a bit higher value for the mass in this mode in comparison with the dipion mode [11], it is commonly accepted that this is one and the same state. The value (8) implies that the X(3872) is produced in B-meson decays with the branching fractions of the same order of magnitude as ordinarycc charmonia [4],…”

Section: Conclusion 52mentioning

confidence: 96%

X(3872) in the molecular model

Kalashnikova¹,

Nefediev²

2019

Phys.-Usp.

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“…(It is also known as the φ (2170) [2]). This resonance was later confirmed by BaBar [3][4][5], BES [6], and Belle [7] and recently by BESIII [8,9]. Its mass and decay width are M = (2188 ± 10) MeV and Γ = (83 ± 12) MeV and its quantum numbers areTo date, the nature of the Y(2175) is still unknown.…”

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confidence: 93%

Is the Y(2175) a strangeonium hybrid meson?

Berg

Steele

et al. 2019

Phys. Rev. D

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QCD Gaussian sum-rules are used to explore the vector (J PC = 1 −− ) strangeonium hybrid interpretation of the Y(2175). Using a two-resonance model consisting of the Y(2175) and an additional resonance, we find that the relative resonance strength of the Y(2175) in the Gaussian sum-rules is less than 5% that of a heavier 2.9 GeV state. This small relative strength presents a challenge to a dominantly-hybrid interpretation of the Y(2175). PACS numbers: I. INTRODUCTIONThe initial state radiation (ISR) process in e + e − annihilation is a very useful technique to search for vector states (i.e., J PC = 1 −− ) in B-factories. In 2006, the BaBar Collaboration studied the cross sections for the ISR processes e + e − → K + K − π + π − and e + e − → K + K − π 0 π 0 up to 4.5 GeV, aiming to confirm the existence of the Y(4260) in the φππ channels. Instead of observing the Y(4260), however, they found a new resonance structure in the φ(1020) f 0 (980) channel, which was named the Y(2175) [1]. (It is also known as the φ (2170) [2]). This resonance was later confirmed by BaBar [3][4][5], BES [6], and Belle [7] and recently by BESIII [8,9]. Its mass and decay width are M = (2188 ± 10) MeV and Γ = (83 ± 12) MeV and its quantum numbers areTo date, the nature of the Y(2175) is still unknown. Based on strange quarkonium mass predictions using a relativized potential model, only the 3 3 S 1 and 2 3 D 1 ss states are expected to have masses close to that of the Y(2175) [10]. However, both interpretations are disfavoured as the corresponding resonance width predictions are significantly larger than the width of the Y(2175). The width of the 3 3 S 1 ss state was predicted to be 378 MeV using the 3 P 0 decay model [11] whereas the width of the 2 3 D 1 ss state was predicted to be 167 MeV in the 3 P 0 model and 212 MeV in the flux tube breaking model [12]. Another possible interpretation of the Y(2175) is that of a strangeonium hybrid meson (i.e.,sgs). Masses of vector strangeonium hybrid mesons have been computed using several methodologies including the flux tube model [13][14][15][16], lattice QCD [17], and QCD Laplace sum-rules (LSRs) [18]. The flux tube model calculation of [16] found a vector strangeonium hybrid mass of 2.1-2.2 GeV. The lattice QCD analysis of [17] found a vector strangeonium hybrid mass between 2.4 GeV and 2.5 GeV while the LSRs calculation of [18] found a heavier mass of (2.9 ± 0.3) GeV. Yet another possible interpretation of the Y(2175) is that of a ssss tetraquark. In [19], the masses of vector ssss tetraquarks were investigated. Two states were predicted with respective masses (2.34±0.17) GeV and (2.41±0.25) GeV. Other LSRs analyses of ssss tetraquarks can be found in [20,21]. Furthermore, the Y(2175) has also been proposed as a molecular state of ΛΛ [22,23]. In [22], a chromomagnetic interaction Hamiltonian was used to predict a hexaquark of mass 2.184 GeV that is strongly coupled to the ΛΛ channel. In [23], a one-boson-exchange potential model was used to predict a ΛΛ mass between 2.

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Publisher’s Note: Search for the rare charmless hadronic decayB+→a0+π0[Phys. Rev. D77, 011101 (2008)]

Cited by 19 publications

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The XYZ mesons: what they aren’t

The XYZ mesons: what they aren’t

X(3872) in the molecular model

Is the Y(2175) a strangeonium hybrid meson?

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