Exotic meson production in the f1(1285)π− system observed in the reaction π−p→ηπ+π−π−p at 18 GeV/c

Kühn, J.; 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.; Danyo, K.; Demianov, A. I.; Denisov, S. P.; Dorofeev, V.; Dowd, J.; Eugenio, P.; Fan, X.; Gribushin, A.; Hackenburg, R.; Hayek, M.; Hu, J. F.; Иванов, Э. И.; Joffe, D.; Kachaev, I.; Kern, W.; King, E.; Kodolova, O.; Korotkikh, V.; Kostin, M.; Lipaev, V. V.; LoSecco, J. M.; Lu, M.; Manak, J. J.; Napolitano, J.; Nozar, M.; Olchanski, C.; Ostrovidov, A. I.; Pedlar, T. K.; Popov, A.; Ryabchikov, D.I.; Sarycheva, L.; Seth, K. K.; Shenhav, N.; Shen, X. Y.; Shephard, W. D.; Sinev, N. B.; Stienike, D. L.; Suh, J. S.; Taegar, S. A.; Tomaradze, A.; Vardanyan, I.; Weygand, D. P.; White, D. B.; Willutzki, H. J.; Witkowski, M.; Yershov, A. A.

doi:10.1016/j.physletb.2004.05.032

Cited by 99 publications

(68 citation statements)

References 27 publications

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“…18), they find a resonant description of the π 1 (1600) with a mass of 1.64 ± 0.03 GeV and a width of 0.24 ± 0.06 GeV which they note is compatible with their measurement in the previous two final states. They also note, that in contradiction with E852 [146], they find no significant 1 −+ intensity above a mass of 1.9 GeV (see Section 5.4). For the ρπ final state, they are unable to conclude that the π 1 (1600) is present.…”

Section: Ves Results On the π 1 (1600)mentioning

confidence: 86%

“…The latter was studied in the reaction π − p → pηπ + π − π − with the f 1 being reconstructed in its ηπ + π − decay mode [146]. The π 1 (1600) was seen via interference with both the 1 ++ and 2 −+ partial waves.…”

Section: E852 Results On the π 1 (1600)mentioning

confidence: 99%

“…The careful follow-on studies from COMPASS to more broadly explore the model space and production mechanisms have started to yield very interesting new results and we look forward to new information in the near future. The E852 experiment has also reported a third π 1 state seen decaying to both f 1 π [146] and to b 1 π [147]. In the f 1 π final state, the π 1 (2015) is produced with M = 1 + in conjunction with the π 1 (1600).…”

Section: Cleo-c Results On the π 1 (1600)mentioning

confidence: 99%

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Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

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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: Ves Results On the π 1 (1600)mentioning

confidence: 86%

Section: E852 Results On the π 1 (1600)mentioning

confidence: 99%

Section: Cleo-c Results On the π 1 (1600)mentioning

confidence: 99%

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Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

199

177

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“…We see that the decay modes (21) and (22) are kinematically forbidden (or strongly suppressed) due to energy conservation. The decay modes (19) are difficult to be observed in the experiments due to the large decay width of scalar mesons (σ and κ). Moreover, the scalar mesons below 1 GeV are sometimes interpreted as tetraquark states, and if so, these decay modes should be suppressed due to the extraqq pair [24].…”

Section: Decay Patterns Of the 1 −+ Tetraquark Statesmentioning

confidence: 99%

“…π 1 (1600) was observed in the reaction π − p → η ′ π − p (η ′ decays to ηπ + π − with a fraction 44.5%) [17]. Both π 1 (1600) and π 1 (2015) were observed in the reactions π − p → ωπ − π 0 p [18] and π − p → ηπ + π − π − p [19]. However, a more recent analysis of a higher statistics sample from E852 3π data found no evidence of π 1 (1600) [20].…”

Section: Introductionmentioning

confidence: 99%

IGJPC=1−1−+tetraquark states

2008

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We study the tetraquark states with I G J P C = 1 − 1 −+ in the QCD sum rule. After exhausting all possible flavor structures, we analyses both the SVZ and finite energy sum rules. Both approaches lead to a mass around 1.6 GeV for the state with the quark contents qqqq, and around 2.0 GeV for the state with the quark contents qsqs. The flavor structure (3 ⊗6) ⊕ (6 ⊗ 3) is preferred. Our analysis strongly indicates that both π1(1600) and π1 (2015) are also compatible with the exotic tetraquark interpretation, which are sometimes labeled as candidates of the 1 −+ hybrid mesons. Moreover one of their dominant decay modes is a pair of axial-vector and pseudoscalar mesons such as b1(1235)π, which is sometimes considered as the characteristic decay mode of the hybrid mesons.

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A Short Review of the Theory of Hard Exclusive Processes

Wallon

2012

Few-Body Syst

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We first present an introduction to the theory of hard exclusive processes. We then illustrate this theory by a few selected examples. The last part is devoted to the most recent developments in the asymptotical energy limit. Introduction Hard Processes in QCDQuantum chromodynamics (QCD) is the theory of strong interaction, one of the four elementary interactions of the universe. It is a relativistic quantum field theory of Yang-Mills type, with the SU (3) gauge group. The quark and gluon elementary fields are confined inside hadrons. Nevertheless, they can be expressed as superpositions of Fock states:-mesons (π, η, f 0 , ρ, ω . . .): |qq + |qqg + |qqqq + · · · -baryons ( p, n, N , . . .): |qqq + |qqqg + |qqqqq + · · · In contrast with electrodynamics, strong interaction increases with distance, or equivalently decreases when energy increases. This phenomenon, called asymptotical freedom, means that the coupling satisfies α s (Q) 1 for Q QC D 200 MeV. The natural question which then arises is how to describe and understand the internal structure of hadrons, starting from their elementary constituents, despite the confinement. In the non-perturbative domain, the two available tools are: -Chiral perturbation theory: systematic expansion based on the fact that u and d quarks have a very small mass, the π mass being an expansion parameter outside the chiral limit (in which these mass would be set to zero). -Discretization of QCD on a 4-d lattice, leading to numerical simulations.Other analytical tools have been proposed recently, among which is the AdS/QCD correspondence, a phenomenological extension of the AdS/CFT correspondence.Besides these tools, one may wonder whether it is possible to extract informations reducing the process to interactions involving a small number of partons (quarks, gluons), despite confinement. This is possible if the considered process is driven by short distance phenomena, with typical distances between the interacting partons much less than 1 fm, i.e. for α s 1. This is the underlying principle of perturbative methods.

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Exotic meson production in the f1(1285)π− system observed in the reaction π−p→ηπ+π−π−p at 18 GeV/c

Cited by 99 publications

References 27 publications

Hybrid mesons

Hybrid mesons

IGJPC=1−1−+tetraquark states

A Short Review of the Theory of Hard Exclusive Processes

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