Structure at 2175 MeV in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>ϕ</mml:mi><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>980</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>observed via initial-state radiation

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S.; Li, S.; Luitz, S.; Lüth, V.; Lynch, H. L.; MacFarlane, D. B.; Marsiske, H.; Messner, R.; Muller, D. R.; O’Grady, C. P.; Özcan, V. E.; Perazzo, A.; Перл, М.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A.; Schindler, R. H.; Schwiening, J.; Snyder, A.; Stelzer, J.; Su, D.; Sullivan, M. K.; Suzuki, K.; Swain, S. K.; Thompson, J. M.; Va’vra, J.; Bakel, N. van; Weaver, M.; Weinstein, A. J.R.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Yarritu, A. K.; Yi, K.; Young, C. C.; Burchat, P. R.; Edwards, A. J.; Majewski, S.; Petersen, B. A.; Roat, C.; Wilden, L.; Ahmed, S.; Alam, M. S.; Bula, R.; Ernst, J.; Jain, V.; Pan, B.; Saeed, M. A.; Wappler, F. R.; Zain, S. B.; Bugg, W.; Krishnamurthy, M.; Spanier, S.; Eckmann, R.; Ritchie, J. L.; Satpathy, A.; Schilling, C. J.; Schwitters, R. F.; Izen, J. M.; Lou, X.; Ye, S.; Bianchi, F.; Gallo, F.; Gamba, D.; Bomben, M.; Bosisio, L.; Cartaro, C.; Cossutti, F.; Ricca, G. 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doi:10.1103/physrevd.74.091103

Cited by 137 publications

(54 citation statements)

References 20 publications

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“…at 90% C.L.. Its hidden charm decay modes J/ψη, J/ψK 0 s K 0 s [132,133,122], and charmless decay modes π + π − φ, [134,135,136] were not seen in experiments, neither, and the following upper limits were given:…”

Section: Its Open Charm Decay Modesmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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Section: Its Open Charm Decay Modesmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…This could be tested by looking for other final states. In a study of the ISR process e + e − → γ ISR φf 0 (980), where φ → K + K − and f 0 (980) → π + π − , the BaBar group observed a distinct resonance-like peak in the φf 0 (980) invariant mass distribution at a mass M = (2175 ± 18) MeV/c 2 with a full width Γ = (58 ± 26) MeV/c 2 (125). Recently, a φf 0 (980) invariant mass peak with mass and width values consistent with the BaBar observation was seen in J/ψ → φf 0 (980)η decays by the BES group (126).…”

Section: An Anomalous Partial Width For "υ(5smentioning

confidence: 99%

The Exotic XYZ Charmonium-Like Mesons

Godfrey

Olsen

2008

Annu. Rev. Nucl. Part. Sci.

298

254

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Charmonium, the spectroscopy of cc mesons, has recently enjoyed a renaissance with the discovery of several missing states and a number of unexpected charmonium-like resonances. The discovery of these new states has been made possible by the extremely large data samples made available by the B-factories at the Stanford Linear Accelerator Center and at KEK in Japan, and at the CESR e + e − collider at Cornell. Conventional cc states are well described by quark potential models. However, many of these newly discovered charmonium-like mesons do not seem to fit into the conventional cc spectrum. There is growing evidence that at least some of these new states are exotic, i.e. new forms of hadronic matter such as mesonic-molecules, tetraquarks, and/or hybrid mesons. In this review we describe expectations for the properties of conventional charmonium states and the predictions for molecules, tetraquarks and hybrids and the various processes that can be used to produce them. We examine the evidence for the new candidate exotic mesons, possible explanations, and experimental measurements that might shed further light on the nature these states.

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“…The Yð2175Þ was first observed in 2006 by the BABAR Collaboration in the ϕf 0 ð980Þ invariant mass spectrum [14][15][16][17], and later confirmed in the BESII [18], Belle [19], and BESIII [20,21] experiments. Its mass and width were measured to be M ¼ 2188 AE 10 MeV and Γ ¼ 83 AE 12 MeV, respectively, and its spin-parity quantum number is J PC ¼ 1 −− [1].…”

Section: Introductionmentioning

confidence: 99%

“…Its mass and width were measured to be M ¼ 2188 AE 10 MeV and Γ ¼ 83 AE 12 MeV, respectively, and its spin-parity quantum number is J PC ¼ 1 −− [1]. We list some of these experiments in [14,15] and Belle [19] measurements of the e þ e − → ϕf 0 ð980Þ cross sections, performed by Shen and Yuan in Ref. [22].…”

Section: Introductionmentioning

confidence: 99%

“…Besides the Yð2175Þ, there might be another structure in the ϕf 0 ð980Þ invariant mass spectrum at around 2.4 GeV, whose evidence can be found in the BABAR [15] [15] determined its mass and width to be 2.47 AE 0.07 GeV and 77 AE 65 MeV, respectively. Shen and Yuan [22] also used the BABAR [14,15] and Belle [19] data to fit its mass and width to be 2436 AE 34 MeV and 99 AE 105 MeV, respectively. However, its statistical significance is smaller than 3.0σ.…”

Section: Introductionmentioning

confidence: 99%

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Possible partner state of the Y(2175)

2018

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We study the Yð2175Þ using the method of QCD sum rules. There are two independent ssss interpolating currents with J PC ¼ 1 −− , and we calculate both their diagonal and their off-diagonal correlation functions. We obtain two new currents that do not strongly correlate to each other, so they may couple to two different physical states: one of them couples to the Yð2175Þ, while the other may couple to another state whose mass is evaluated to be 2.41 AE 0.

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Structure at 2175 MeV ine+e−→ϕf0(980)observed via initial-state radiation

Cited by 137 publications

References 20 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

The Exotic XYZ Charmonium-Like Mesons

Possible partner state of the Y(2175)

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