A study of isospin 1 meson states using 10 GeV/c K−K0 production data

Martin, A. D.; Ozmutlu, E.N.; Baldi, Ranieri D.; Böhringer, T.; Dorsaz, P.A.; Hungerbühler, V.; Kienzle‐Focacci, M. N.; Martin, Michel; Mermoud, André; Nef, C.; Siegrist, P.

doi:10.1016/0370-2693(78)90693-7

Cited by 32 publications

(10 citation statements)

References 12 publications

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“…In general, a two-pseudoscalar PWA suffers from discrete ambiguities [27,28,24]. The observed insignificance of unnatural-parity transfer crucially reduces the ambiguities.…”

mentioning

confidence: 99%

Odd and even partial waves ofηπ−andη′π−

Adolph¹,

Akhunzyanov²,

Alexeev³

et al. 2015

Physics Letters B

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Exclusive production of ηπ − and η π − has been studied with a 191 GeV/c π − beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c 2 . A striking similarity between the two systems is observed for the L = 2, 4, 6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a 2 (1320) and a 4 (2040) are in line with this similarity. In contrast, a strong enhancement of η π − over ηπ − is found for the L = 1, 3, 5 waves, which carry non-qq quantum numbers. The L = 1 intensity peaks at 1.7 GeV/c 2 in η π − and at 1.4 GeV/c 2 in ηπ − , the corresponding phase motions with respect to L = 2 are different.

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“…In general, a two-pseudoscalar PWA suffers from discrete ambiguities [27,28,24]. The observed insignificance of unnatural-parity transfer crucially reduces the ambiguities.…”

mentioning

confidence: 99%

Odd and even partial waves ofηπ−andη′π−

Adolph¹,

Akhunzyanov²,

Alexeev³

et al. 2015

Physics Letters B

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“…Additional fits including natural-exchange spin-3, spin-5 and spin-6 waves were also performed, their presence being expected from a prior analysis of the K − K 0 S system and double-Regge phenomenology [8,9]. With these waves included, the data can be described without recourse to unnatural-exchange waves all the way up to 3 GeV, in accordance with the expected dominance of the spin-parity natural Pomeron exchange.…”

Section: Partial-wave Analysis In Mass Binsmentioning

confidence: 78%

“…Resonances of the systems π − η (′) in the reactions π − p → π − η (′) prevents the fit from accounting for incoherent contributions, the phases therefore cannot be interpreted without care [8]. Our data show a significant P + wave which interferes with the dominant D + wave.…”

Section: Pos(qnp2012)074mentioning

confidence: 79%

“…The similarity of the scaled D + waves suggests that the difference in the relative phase motion of the P + and D + waves is mainly due to different contents of the P + wave. The aforementioned ambiguity in the phase determination allows reflecting the extracted phases on the line corresponding to −180 degrees, which would make the relative phase of the D + and P + waves of the ηπ − system return to the corresponding relative phases of the η ′ π − system at high masses, suggesting that the difference is due to an incoherent contribution, which in general tends to reduce relative phase differences [8].…”

Section: Pos(qnp2012)074mentioning

confidence: 99%

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Resonances of the systems \pi -\eta and \pi -\eta ' in the reactions \pi -p \rightarrow \pi -\eta p(slow) and \pi -p \rightarrow \pi -\eta ' p(slow) at COMPASS

Schlüter¹

2012

Proceedings of Sixth International Conference on Quarks and Nuclear Physics — PoS(QNP2012)

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“…Note that the normalizations in Eqs. ( 186), ( 188), (191), and (192) only define the relative normalization of the transition amplitudes of the various partial waves. In order to fix the absolute normalization, the additional normalization condition in Eq.…”

Section: Normalizationmentioning

confidence: 99%

Light-Meson Spectroscopy with COMPASS

Ketzer,

Grube,

Ryabchikov

2019

Preprint

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Despite decades of research, we still lack a detailed quantitative understanding of the way quantum chromodynamics (QCD) generates the spectrum of hadrons. Precise experimental studies of the hadron excitation spectrum and the dynamics of hadrons help to improve models and to test effective theories and lattice QCD simulations. In addition, QCD seems to allow hadrons beyond the three-quark and quark-antiquark configurations of the constituent-quark model. These so-called exotic hadrons contain additional constituent (anti)quarks or excited gluonic fields that contribute to the quantum numbers of the hadron. Hadron spectroscopy is currently one of the most active fields of research in hadron physics. The COMPASS experiment at the CERN SPS is studying the excitation spectrum of light mesons, which are composed of up, down, and strange quarks. The excited mesons are produced via the strong interaction, i.e. by Pomeron exchange, by scattering a 190 GeV/c pion beam off proton or nuclear targets. On heavy nuclear targets, in addition the electromagnetic interaction contributes in the form of quasi-real photon exchange at very low four-momentum transfer squared. COMPASS has performed the most comprehensive analyses to date of isovector resonances decaying into ηπ, η π, or π − π − π + final states. In this review, we give a general and pedagogical introduction into scattering theory and the employed partial-wave analysis techniques. We also describe novel methods developed for the high-precision COMPASS data. The COMPASS results are summarized and compared to previous measurements. In addition, we discuss possible signals for exotic mesons and conclude that COMPASS data provide solid evidence for the existence of the manifestly exotic π 1 (1600), which has quantum numbers forbidden for a quark-model state, and of the a 1 (1420), which does not fit into the quark-model spectrum. By isolating the contributions from quasi-real photon exchange, COMPASS has measured the radiative widths of the a 2 (1320) and, for the first time, that of the π 2 (1670) and has tested predictions of chiral perturbation theory for the process π − + γ → π − π − π + .

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A study of isospin 1 meson states using 10 GeV/c K−K0 production data

Cited by 32 publications

References 12 publications

Odd and even partial waves ofηπ−andη′π−

Odd and even partial waves ofηπ−andη′π−

Resonances of the systems \pi -\eta and \pi -\eta ' in the reactions \pi -p \rightarrow \pi -\eta p(slow) and \pi -p \rightarrow \pi -\eta ' p(slow) at COMPASS

Light-Meson Spectroscopy with COMPASS

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