Study of the ηπ− system in the π-p reaction at 6.3 GeV/c

Aoyagi, H.; Fukui, S.; Hasegawa, T.; Hayashi, Naoki; Horikawa, N.; Iizuka, Jugoro; Inaba, S.; Ishimoto, S.; Ishizaki, Y.; Iwata, T.; Kanatani, E.; Kawai, H.; Kinashi, T.; Kishi, A.; Kobayashi, Keisuke; Matsuda, Kazunori; Matsuda, T.; Mori, K.; Nakagawa, T.; Nakamura, S.; Nakamura, T.; Nakanishi, Toru; Narita, Atsushi; Ohmi, K.; Ohmori, C.; Samoto, Tetsuo; Shimizu, H.; Tajima, Y.; Takamatsu, K.; Takasaki, M.; Tsubaki, T.; Tsuchiya, K.; Tsuru, T.; Yamauchi, I.; Yasu, Y.; Yoshida, Hiroshi; Wakai, A.

doi:10.1016/0370-2693(93)90456-r

Cited by 74 publications

(32 citation statements)

References 28 publications

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“…Somewhat later, an experiment at KEK using a 6.3 GeV/c π − beam observed a 1 −+ state in the ηπ − system with a mass of 1.3431 ± 0.0046 GeV and a width of 0.1432 ± 0.0125 GeV [123]. Since this mass and width is very close to that of the strong signal for the a 2 (1320), the possibility of signal leakage into the weak exotic wave from the strong a 2 signal often comes up.…”

Section: Kek Results On the π 1 (1400)mentioning

confidence: 99%

Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

199

176

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A review of the theoretical and experimental status of hybrid hadrons is presented. The states π 1 (1400), π 1 (1600), and π 1 (2015) are thoroughly reviewed, along with experimental results from GAMS, VES, Obelix, COMPASS, KEK, CLEO, Crystal Barrel, CLAS, and BNL. Theoretical lattice results on the gluelump spectrum, adiabatic potentials, heavy and light hybrids, and transition matrix elements are discussed. These are compared with bag, string, flux tube, and constituent gluon models. Strong and electromagnetic decay models are described and compared to lattice gauge theory results. We conclude that while good evidence for the existence of a light isovector exotic meson exists, its confirmation as a hybrid meson awaits discovery of its iso-partners. We also conclude that lattice gauge theory rules out a number of hybrid models and provides a reference to judge the success of others.

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Section: Kek Results On the π 1 (1400)mentioning

confidence: 99%

Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

199

176

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“…Motivated by reports of a π 1 (1400) observed in the ηπ spectrum [2][3][4][5], we test the significance of an additional P -wave ηπ and η ′ π resonance that has the mass and width of the π 1 (1400) reported in Ref. [14].…”

Section: Figures 7(a) and 7(d) Display Dalitz Plots From Thementioning

confidence: 99%

“…The π 1 (1400) has been reported primarily decaying to ηπ [2][3][4][5], while the π 1 (1600) has been reported to decay to η ′ π [6,7], b 1 π [8,9], f 1 π [10], and ρπ [11].…”

mentioning

confidence: 99%

Amplitude analyses of the decaysχc1→ηπ+π−andχc1
Adams¹,
Napolitano²,
Ecklund³
et al. 2011
Phys. Rev. D
32
2
18
0
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Using a data sample of 2.59 × 10 7 ψ(2S) decays obtained with the CLEO-c detector, we perform amplitude analyses of the complementary decay chains ψ(2S) → γχ c1 ; χ c1 → ηπ + π − and ψ(2S) → γχ c1 ; χ c1 → η ′ π + π − . We find evidence for an exotic P -wave η ′ π amplitude, which, if interpreted as a resonance, would have parameters consistent with the π 1 (1600) state reported in other production mechanisms. We also make the first observation of the decay a 0 (980) → η ′ π and measure the ratio of branching fractions B(a 0 (980) → η ′ π)/B(a 0 (980) → ηπ) = 0.064 ± 0.014 ± 0.014. The ππ spectrum produced with a recoiling η is compared to that with η ′ recoil.

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“…The E852 collaboration [1] reported a signal for a 1 ÿ hybrid meson decaying into with a mass near 1.6 GeV, though the significance of this result has been questioned [2]. Another exotic 1 ÿ candidate at 1.4 GeV has been tentatively identified in the channel by E852 [3], VES [4], KEK [5], and Crystal Barrel [6]. The first observation of a doubly charmed baryon has been reported [7], and evidence for the possible existence of a strangeness S 1 pentaquark state has emerged at SPring-8, JLab, and elsewhere [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Group-theoretical construction of extended baryon operators in lattice QCD

et al. 2005

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The design and implementation of large sets of spatially extended, gauge-invariant operators for use in determining the spectrum of baryons in lattice QCD computations are described. Group-theoretical projections onto the irreducible representations of the symmetry group of a cubic spatial lattice are used in all isospin channels. The operators are constructed to maximize overlaps with the low-lying states of interest, while minimizing the number of sources needed in computing the required quark propagators. Issues related to the identification of the spin quantum numbers of the states in the continuum limit are addressed.

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Study of the ηπ− system in the π-p reaction at 6.3 GeV/c

Cited by 74 publications

References 28 publications

Hybrid mesons

Hybrid mesons

Amplitude analyses of the decaysχc1→ηπ+π−andχc1
Adams¹,
Napolitano²,
Ecklund³
et al. 2011
Phys. Rev. D
32
2
18
0
View full text Add to dashboard Cite

Group-theoretical construction of extended baryon operators in lattice QCD

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Study of the ηπ− system in the π-p reaction at 6.3 GeV/c

Cited by 74 publications

References 28 publications

Hybrid mesons

Hybrid mesons

Amplitude analyses of the decaysχc1→ηπ+π−andχc1Adams1, Napolitano2, Ecklund3 et al. 2011Phys. Rev. D322180View full textAdd to dashboardCite

Group-theoretical construction of extended baryon operators in lattice QCD

Contact Info

Product

Resources

About

Amplitude analyses of the decaysχc1→ηπ+π−andχc1
Adams¹,
Napolitano²,
Ecklund³
et al. 2011
Phys. Rev. D
32
2
18
0
View full text Add to dashboard Cite