Test of the multiquark structure of 
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 in strong two-body decays

Gutsche, Thomas; Ivanov, Mikhail A.; Körner, Jürgen; Lyubovitskij, Valery E.; Xu, Kai

doi:10.1103/physrevd.96.114004

Cited by 23 publications

(15 citation statements)

References 43 publications

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“…Ref. [168]. The meson a 1 was modeled there as a four-quark state with diquark-antidiquark and molecule structures.…”

Section: The Axial-vector Resonance a 1 (1420)mentioning

confidence: 99%

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Four-quark exotic mesons

Agaev¹,

Azizi²,

Sundu³

2020

Turk J Phys

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We review our investigations devoted to the analysis of the resonances Zc(3900) , Zc(4430) , Zc(4100) , X(4140) , X(4274) , a1(1420) , Y (4660) , X(2100) , X(2239) , and Y (2175) discovered in various processes by Belle, BaBar, BESIII, D0, CDF, CMS, LHCb and COMPASS collaborations. These resonances are considered as serious candidates to four-quark (tetraquark) exotic mesons. We treat all of them as diquark-antidiquark states with relevant spin-parities, find their masses and couplings, as well as explore their dominant strong decay channels. Calculations are performed in the context of the QCD sum rule method. Thus, the spectroscopic parameters of the tetraquarks are evaluated using the two-point sum rules. For computations of the strong couplings GT M 1 M 2 , corresponding to the vertices T M1M2 and necessary to find the partial widths of the strong decays T → M1M2 , we employ either the three-point or full/approximate versions of the QCD light-cone sum rules methods. Obtained results are compared with available experimental data, and with predictions of other theoretical studies.

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“…Ref. [168]. The meson a 1 was modeled there as a four-quark state with diquark-antidiquark and molecule structures.…”

Section: The Axial-vector Resonance a 1 (1420)mentioning

confidence: 99%

“…Two-body strong decays of a 1 in the context of the covariant confined quark model were examined in Ref. [168]. The meson a 1 was modeled there as a four-quark state with diquark-antidiquark and molecule structures.…”

Section: The Axial-vector Resonance a 1 (1420)mentioning

confidence: 99%

Four-quark exotic mesons

Agaev¹,

Azizi²,

Sundu³

2020

Turk J Phys

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“…The authors of Ref. [98] studied the two-body decay rates for the modes a 1 ð1420Þ → f 0 ð980Þπ and a 1 ð1420Þ → KK Ã ð892Þ for four-quark configurations using the covariant confined quark model. They found that a molecular configuration is preferred over a compact diquark-antidiquark state.…”

mentioning

confidence: 99%

Light isovector resonances in π−p→π−π−π+p at
Aghasyan¹,
Alexeev²,
Alexeev³
et al. 2018
Phys. Rev. D
71
7
97
0
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We have performed the most comprehensive resonance-model fit of π − π − π þ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction π − þ p → π − π − π þ þ p recoil with a 190 GeV=c pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, 0.5 < m 3π < 2.5 GeV=c 2 , and simultaneously in 11 bins of the reduced four-momentum transfer squared, 0.1 < t 0 < 1.0 ðGeV=cÞ 2 , are subjected to a resonance-model fit using Breit-Wigner amplitudes to simultaneously describe a subset of 14 selected waves using 11 isovector light-meson states with J PC ¼ 0 −þ , 1 þþ , 2 þþ , 2 −þ , 4 þþ , and spin-exotic 1 −þ quantum numbers. The model contains the well-known resonances πð1800Þ, a 1 ð1260Þ, a 2 ð1320Þ, π 2 ð1670Þ, π 2 ð1880Þ, and a 4 ð2040Þ. In addition, it includes the disputed π 1 ð1600Þ, the excited states a 1 ð1640Þ, a 2 ð1700Þ, and π 2 ð2005Þ, as well as the resonancelike a 1 ð1420Þ. We measure the resonance parameters mass and width of these objects by combining the information from the PWA results obtained in the 11 t 0 bins. We extract the relative branching fractions of the ρð770Þπ and f 2 ð1270Þπ decays of a 2 ð1320Þ and a 4 ð2040Þ, where the former one is measured for the first time. In a novel approach, we extract the t 0 dependence of the intensity of the resonances and of their phases. The t 0 dependence of the intensities of most resonances differs distinctly from the t 0 dependence of the nonresonant components. For the first time, we determine the t 0 dependence of the phases of the production amplitudes and confirm that the production mechanism of the Pomeron exchange is common to all resonances. We have performed extensive systematic studies on the model dependence and correlations of the measured physical parameters.

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“…[29]. In this work partial decay channels of a 1 ð1420Þ were investigated in the framework of the covariant confined quark model by treating a 1 ð1420Þ as a tetraquark with both diquark-antidiquark and molecular structures.…”

Section: Introductionmentioning

confidence: 99%

New a1(1420) state: Structure, mass, and width

2018

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The structure, spectroscopic parameters and width of the resonance with quantum numbers J PC ¼ 1 þþ discovered by the COMPASS Collaboration and classified as the a 1 ð1420Þ meson are examined in the context of QCD sum rule method. In the calculations the axial-vector meson a 1 ð1420Þ is treated as a fourquark state with the diquark-antidiquark structure. The mass and current coupling of a 1 ð1420Þ are evaluated using QCD two-point sum rule approach. Its observed decay mode a 1 ð1420Þ → f 0 ð980Þπ, and kinematically allowed ones, namely a 1 → K ÃAE K ∓ , a 1 → K Ã0K0 and a 1 →K Ã0 K 0 channels are studied employing QCD sum rules on the light-cone. Our prediction for the mass of the a 1 ð1420Þ state m a 1 ¼ 1416

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Test of the multiquark structure of a1(1420) in strong two-body decays

Cited by 23 publications

References 43 publications

Four-quark exotic mesons

Four-quark exotic mesons

Light isovector resonances in π−p→π−π−π+p at
Aghasyan¹,
Alexeev²,
Alexeev³
et al. 2018
Phys. Rev. D
71
7
97
0
View full text Add to dashboard Cite

New a1(1420) state: Structure, mass, and width

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Test of the multiquark structure of a1(1420) in strong two-body decays

Cited by 23 publications

References 43 publications

Four-quark exotic mesons

Four-quark exotic mesons

Light isovector resonances in π−p→π−π−π+p at Aghasyan1, Alexeev2, Alexeev3 et al. 2018Phys. Rev. D717970View full textAdd to dashboardCite

New a1(1420) state: Structure, mass, and width

Contact Info

Product

Resources

About

Light isovector resonances in π−p→π−π−π+p at
Aghasyan¹,
Alexeev²,
Alexeev³
et al. 2018
Phys. Rev. D
71
7
97
0
View full text Add to dashboard Cite