Evidence for Exotic Meson Production in the Reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="italic">p</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="italic">η</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="italic">p</mml:mi></mml:math

Thompson, David R.; Adams, G. S.; Adams, T.; Bar‐Yam, Z.; Bishop, J. M.; Bodyagin, V. A.; Brown, D. S.; Cason, N. M.; Chung, S. U.; Cummings, J. P.; Denisov, S. P.; Dorofeev, V.; Dowd, J.; Eugenio, P.; Hackenburg, R.; Hayek, M.; Иванов, Э. И.; Kachaev, I.; Kern, W.; King, E.; Kodolova, O.; Korotkikh, V.; Kostin, M.; Kühn, J.; Lipaev, V. V.; LoSecco, J. M.; Manak, J. J.; Napolitano, J.; Nozar, M.; Olchanski, C.; Ostrovidov, A. I.; Pedlar, T. K.; Popov, A.; Ryabchikov, D.I.; Sanjari, A. H.; Sarycheva, L.; Seth, K. K.; Shephard, W. D.; Sinev, N. B.; Smith, J. A.; Stienike, D. L.; Straßburger, C.; Taegar, S. A.; Vardanyan, I.; Weygand, D. P.; White, D. B.; Willutzki, H. J.; Wise, J.; Witkowski, M.; Yershov, A. A.; Zhao, Dongxu

doi:10.1103/physrevlett.79.1630

Cited by 202 publications

(78 citation statements)

References 23 publications

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“…There are three experimental candidates for a light 1 Àþ hybrid. The 1 ð1400Þ was observed by the E852 (BNL, U.S.) [3] and VES (Protvino, Russia) [4] experiments in the reaction À N ! À N, and by the Crystal Barrel experiment [5,6] in pn !…”

mentioning

confidence: 90%

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/c
Alekseev¹,
Alexakhin²,
Alexandrov³
et al. 2010
Phys. Rev. Lett.
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The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1 GeV2/c2. The well-known resonances a1(1260), a2(1320), and π2(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers J(PC)=1-+ at 1.66 GeV/c2 decaying to ρπ. The resonant nature of this wave is evident from the mass-dependent phase differences to the J(PC)=2-+ and 1++ waves. From a mass-dependent fit a resonance mass of (1660±10(-64)(+0)) MeV/c2 and a width of (269±21(-64)(+42)) MeV/c2 are deduced, with an intensity of (1.7±0.2)% of the total intensity.

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mentioning

confidence: 90%

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/c
Alekseev¹,
Alexakhin²,
Alexandrov³
et al. 2010
Phys. Rev. Lett.
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118
7
70
2
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“…3p Á q p 2 q 2 þ p 0 Á q p 02 q 2 þ ih " qqihg 2 s GGi 18 ffiffiffi 2 p À p Á q p 4 q 2 þ p Á q p 2 q 4 À p 0 Á q p 04 q 2 þ p 0 Á q p 02 q 4 þ ihg s " qGqihg 2 s GGi 48 ffiffiffi 2 p À 1 p 04 q 2 þ 1 p 02 q 4 þ 1 p 06 q 4 À 1 p 04 q 6 8 3…”

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Decay properties of the1−+hybrid state

et al. 2011

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Within the framework of the QCD sum rules, we consider the three-point correlation function, work at the limit q 2 ! 0 and m ! 0, and pick out the singular term $ 1 q 2 to extract the pionic coupling constants of the 1 Àþ hybrid meson. Then, we calculate the decay widths of different modes. The decay width of the S-wave modes b 1 , f 1 increases quickly as the hybrid meson mass and decay momentum increase. But for the low mass hybrid meson around 1.6 GeV, the P-wave decay mode is very important and its width is around 180 MeV, while the widths of and 0 are strongly suppressed. We suggest the experimental search of 1 ð1600Þ through the decay chains at the Beijing Spectrometer: J=c ðc 0 Þ ! 1 þ or J=c ðc 0 Þ ! 1 þ , where the 1 state can be reconstructed through the decay modes 1 ! ! þ À 0 or 1 ! f 1 ð1285Þ 0 . It is also interesting to look for 1 using the available BELLE/ BABAR data through the process e þ e

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“…For light quark hybrids one can explore the spectrum for all J P C values, finding [16,17,18] a lightest spin-exotic hybrid with J P C = 1 −+ and mass 1.9(2) GeV. This mass is significantly higher than mass values found [20] experimentally (1.4 and 1.6 GeV).…”

Section: Discussionmentioning

confidence: 79%

“…The J P C = 1 −+ state is found to be lightest. It is not easy to reconcile these lattice results with experimental indications [20] for resonances at 1.4 GeV and 1.6 GeV, especially the lower mass value. Mixing with qqqq states such as ηπ is not included for realistic quark masses in the lattice calculations.…”

Section: Light Quark Hybrid Mesonsmentioning

confidence: 92%

Quarkonia and hybrids from the Lattice

Michael¹

1999

Proceedings of 8th International Symposium on Heavy Flavour Physics — PoS(hf8)

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Evidence for Exotic Meson Production in the Reactionπ−p→ηπ−p

Cited by 202 publications

References 23 publications

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/c
Alekseev¹,
Alexakhin²,
Alexandrov³
et al. 2010
Phys. Rev. Lett.
Self Cite
118
7
70
2
View full text Add to dashboard Cite

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/c
Alekseev¹,
Alexakhin²,
Alexandrov³
et al. 2010
Phys. Rev. Lett.
Self Cite
118
7
70
2
View full text Add to dashboard Cite

Decay properties of the1−+hybrid state

Quarkonia and hybrids from the Lattice

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Evidence for Exotic Meson Production in the Reactionπ−p→ηπ−p

Cited by 202 publications

References 23 publications

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/cAlekseev1, Alexakhin2, Alexandrov3 et al. 2010Phys. Rev. Lett.Self Cite1187702View full textAdd to dashboardCite

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/cAlekseev1, Alexakhin2, Alexandrov3 et al. 2010Phys. Rev. Lett.Self Cite1187702View full textAdd to dashboardCite

Decay properties of the1−+hybrid state

Quarkonia and hybrids from the Lattice

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Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/c
Alekseev¹,
Alexakhin²,
Alexandrov³
et al. 2010
Phys. Rev. Lett.
Self Cite
118
7
70
2
View full text Add to dashboard Cite

Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/c
Alekseev¹,
Alexakhin²,
Alexandrov³
et al. 2010
Phys. Rev. Lett.
Self Cite
118
7
70
2
View full text Add to dashboard Cite