Observation of a New<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">J</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">PC</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mrow><mml:msup><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Exotic State in the Reaction<mml:math xmlns:mml="http://www

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

doi:10.1103/physrevlett.81.5760

Cited by 191 publications

(138 citation statements)

References 23 publications

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“…In this analysis, they carried out a systematic study of which partial waves were important in the fit. When they used the same wave set as in the E852 analysis [143,144], they found the same solution showing a signal for the π 1 (1600) in both final states. However, when they allowed for more partial waves, they found that the signal for the π 1 (1600) vanished.…”

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

confidence: 94%

“…Rather than limiting the rank of the density matrix as was done in [143,144], they did not limit it. This allowed for a more general fit that might be less sensitive to acceptance affects.…”

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

confidence: 99%

“…Using an 18 GeV/c π − beam incident on a proton target, the E852 collaboration carried out a partial wave analysis of the π + π − π − final state [143,144]. They saw both the ρ 0 π − and f 2 (1270)π − intermediate states and observed a J P C = 1 −+ state which decayed to ρπ, the π 1 (1600).…”

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

confidence: 99%

“…[143,144]. In this larger data set, they looked at the reactions π − p → nπ + π − π − and π − p → nπ − π 0 π 0 and carried out a partial wave analysis for both the π + π − π − and the π − π 0 π 0 final states.…”

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

confidence: 99%

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Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

205

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: E852 Results On the π 1 (1600)mentioning

confidence: 94%

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

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Hybrid mesons

Meyer

Swanson

2015

Progress in Particle and Nuclear Physics

205

176

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“…Two experimentally observed 1 −+ hybrid candidates in the light-quark sector have been reported in different decay channels so far, the π 1 (1400) mainly seen in ηπ decays by e.g. E852 [3], VES [4], and Crystal Barrel [5], and the π 1 (1600) observed by both E852 and VES in the decay channels ρπ [6,7], η π [4,8], f 1 π [9,10], and ωππ [10,11]). In particular the resonant nature of the π 1 (1600) in the ρπ decay channel observed in 3π final states is highly disputed, see e.g.…”

Section: Introductionmentioning

confidence: 99%

First Results on Hadron Spectroscopy at COMPASS

Nerling

2011

Proceedings of 35th International Conference of High Energy Physics — PoS(ICHEP 2010)

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The COMPASS fixed-target experiment at the CERN SPS is dedicated to the study of hadron structure and dynamics. One goal of the physics programme using hadron beams is the search for new states, in particular the search for J PC exotic states and glueballs. After a short pilot run in 2004 (190 GeV/c π − beam, lead target), we started our hadron spectroscopy programme in 2008 by collecting unprecedented statistics using 190 GeV/c negative hadron beams on a liquid hydrogen target. A similar amount of data with 190 GeV/c positive hadron beams has been taken in 2009, as well as some data (negative beam) on nuclear targets. As a first result the observation of a significant J PC spin-exotic signal in the 2004 data -consistent with the disputed π 1 (1600) -was recently published. Our spectrometer features good coverage by electromagnetic calorimetry, crucial for the detection of final states involving π 0 , η or η , and the 2008/09 data provide an excellent opportunity for the simultaneous observation of new states in different decay modes. The diffractively produced (3π) − system for example can be studied in π − π + π − and π − π 0 π 0 final states, respectively. Observation of new states in both modes provides important consistency checks within the same experiment as the reconstruction of charged and neutral modes rely on completely different parts of the apparatus. We present the first results and give an overview of the status on various ongoing analyses of the 2008/09 data. π bachelor π 1 π 2 Figure 1: Left: Sketch of the two-stage COMPASS spectrometer. Right: (top) Diffractive meson production via t-channel Reggeon exchange: The beam particle a is excited to a resonance c subsequently decaying into n mesons, the target stays intact. (bottom) Diffractive dissociation into 3π final states as described in the isobar model: The produced resonance X − with quantum numbers J PC M ε decays into an isobar with spin S and relative orbital angular momentum L with respect to the π bachelor . The isobar subsequently decays into two pions. At high energies, the Pomeron is the dominant Regge-trajectory.

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