News from the light and strange meson sector

Authors

  • Stefan Wallner Technische Universitaet Muenchen (DE)

DOI:

https://doi.org/10.31349/SuplRevMexFis.3.0308004

Keywords:

hadron spectroscopy, GlueX, COMPASS, LHCb, BESIII, JPAC, HadSpec, partial-wave analysis, non-resonant processes, lattice QCD, light mesons, strange mesons, exotics

Abstract

Recent high-quality data sets from various experiments grant new insights into the excitation spectrum of light mesons, which are composed of up, down, and strange quarks. In the non-strange light-meson sector, many recent experimental and theory efforts are focused on the search for so-called exotic states, which are states beyond the na¨ıve constituent quark-model. To this end, various potential decay modes of exotic states are studied at experiments such as GlueX or COMPASS. In addition, there is recent progress in the understanding of so-called non-resonant processes, which act as background in searches for light mesons, as well as in the prediction of light mesons from lattice QCD. While the non-strange light-meson spectrum is already mapped out rather well, many predicted strange mesons have not yet been observed experimentally or need further confirmation. Recent high-precision data from experiments such as LHCb and BESIII allow us to study strange mesons in heavy-meson decays. Alternatively, strange mesons are studied in diffractive scattering of high-energy kaon beams. The so far world’s largest data set on the diffractively produced K−π −π + final state was measured by the COMPASS experiment. A recent analysis of this data covers a large variety of strange mesons over a wide mass range in a single, self-consistent analysis

References

M. G. Alexeev et al., [COMPASS], Exotic meson π1(1600) with J P C = 1−+ and its decay into ρ(770)π, (2021), https://arxiv.org/abs/2108.01744.

J. Dudek et al., [HadSpec], Toward the excited isoscalar meson spectrum from lattice QCD, Phys. Rev. D 88 (2013) 094505, http://doi.org/10.1103/PhysRevD.88.094505.

A. Austregesilo, [GlueX], Exploring the Hadron Spectrum with GlueX, JLUO Group Meeting, Wednesday June 24 2020, https://www.jlab.org/conference/jluo2020/program.

P. Pauli, [GlueX], Accessing glue through photoproduction measurements at GlueX, Hadron2021, Mexico, within these proceedings.

M. Aghasyan et al., [COMPASS], Light isovector resonances in π −p → π −π −π +p at 190 GeV/c, Phys. Rev. D 98 (2018) 092003, http://doi.org/10.1103/PhysRevD.98.092003.

L. Bibrzycki et al., [JPAC], π −p → η ( 0 )π −p in the doubleRegge region, Eur. Phys. J. C 81 (2021) 647, http://doi.org/10.1140/epjc/s10052-021-09420-1.

B. Kopf et al., Investigation of the lightest hybrid meson candidate with a coupled-channel analysis of pp¯ -, π −p- and ππData, Eur. Phys. J. C 81 (2021) 1056, https://doi.org/10.1140/epjc/s10052-021-09821-2.

A. Rodas et al., [JPAC], Determination of the Pole Position of the Lightest Hybrid Meson Candidate, Phys. Rev. Lett. 122 (2019) 042002, http://doi.org/10.1103/PhysRevLett.122.04200.

A. J. Woss et al., [HadSpec], Decays of an exotic 1 −+ hybrid meson resonance in QCD, Phys. Rev. D 103 (2021) 54502, http://doi.org/10.1103/PhysRevD.103.054502.

M. Lu et al., [E852], Exotic meson decay to ωπ0π −, Phys. Rev. Lett. 94 (2005) 032002, http://doi.org/10.1103/PhysRevLett.94.032002.

C. A. Baker et al., Confirmation of a0(1450) and π1(1600) in pp¯ → ωπ+π −π 0 at rest, Phys. Lett. B 563 (2003) 140, http://doi.org/10.1016/S0370-2693(03)00643-9.

F. M. Kaspar and S. Gerassimov, [COMPASS], Analysis of the Diffractively Produced π −π −π + Final State at COMPASS, Hadron2021, Mexico, within these proceedings.

P. A. Zyla et al., [PDG], Review of Particle Physics 2021 update, Prog. Theor. Exp. Phys. 2020 (2021) 083C01, http://doi.org/10.1093/ptep/ptaa104.

D. Ebert, R. N. Faustov, and V. O. Galkin, Mass spectra and Regge trajectories of light mesons in the relativistic quark model, Phys. Rev. D 79 (2009) 114029, http://doi.org/10.1103/PhysRevD.79.114029.

S. Wallner, [COMPASS], Strange-Meson Spectroscopy at COMPASS, HADRON2019, Guilin, China, 2020, 134, http://doi.org/10.1142/9789811219313.0019.

S. Wallner, Exploring the Strange-Meson Spectrum with COMPASS in the Reaction K− + p → K−π −π + + p, Ph.D. thesis: Technical University of Munich, 2022.

C. Daum et al., [ACCMOR], Diffractive production of strange mesons at 63 GeV, Nucl. Phys. B 187 (1981) 1, http://doi.org/10.1016/0550-3213(81)90114-0.

M. Ablikim et al., [BESIII], Partial wave analysis of J/ψ → K+K−π 0 , Phys. Rev. D 100 (2019) 032004, http://doi.org/10.1103/PhysRevD.100.032004.

M. Ablikim et al., [BESIII], Partial wave analysis of ψ(3686) → K+K−η, Phys. Rev. D 101 (2020) 032008, http://doi.org/10.1103/PhysRevD.101. 032008.

R. Aaij et al., [LHCb], Observation of J/ψφ Structures Consistent with Exotic States from Amplitude Analysis of B + → J/ψφK+ Decays, Phys. Rev. Lett. 118 (2017) 022003, http://doi.org/10.1103/PhysRevLett.118.022003.

R. Aaij et al., [LHCb], Observation of New Resonances Decaying to J/ψK+ and J/ψφ, Phys. Rev. Lett. 127 (2021) 082001, http://doi.org/10.1103/PhysRevLett.127.082001

V. M. Karnaukhov, V. I. Moroz, and C. Coca, A Narrow Structure with M = 1.63 GeV/c2 in the Mass Spectrum of KSπ +π − System, Phys. Atom. Nucl. 61 (1998) 203.

B. Adams et al., [AMBER], Letter of Intent: A New QCD facility at the M2 beam line of the CERN SPS (COMPASS++/AMBER), (2018), arXiv:https://arxiv.org/abs/1808.00848.

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Published

2022-05-19

How to Cite

1.
Wallner S. News from the light and strange meson sector. Supl. Rev. Mex. Fis. [Internet]. 2022 May 19 [cited 2022 Dec. 9];3(3):0308004 1-7. Available from: https://rmf.smf.mx/ojs/index.php/rmf-s/article/view/6118