Model dependence of the π1 (1600) → ρ(770)π signal


  • Fabian Krinner Max-Planck-Institut für Physik



Hadron spectroscopy, COMPASS experiment, partial-wave analysis, isobar model, meson resonance, exotic, pi1(1600), rho(770)


Using the large C OMPASS data set on diffractive three pion production, we investigate the contradictory observations reported by previous experiments on the existence of a resonance signal in the spin-exotic wave with spin, parity and charge conjugation quantum numbers 1−+ . We identify a strong dependence of the result on the employed analysis model as the cause and derive a model tuned to minimize these effects. Additionally, we study the robustness of our analysis model using the approach of freed-isobar partial-wave analysis.


M. G. Alexeev et al. [C OMPASS ], [arXiv:2108.01744].

S. U. Chung, K. Danyo, R. W. Hackenburg, C. Olchanski, J. S. Suh, H. J. Willutzki, S. P. Denisov, V. Dorofeev, V. V. Lipaev, A. V. Popov et al. [BNL E852], Phys. Rev. D 65 (2002) 072001.

A. R. Dzierba, R. Mitchell, E. Scott, P. Smith, M. Swat, S. Teige, A. Szczepaniak, S. P. Denisov, V. Dorofeev, I. Kachaev et al., Phys. Rev. D 73 (2006) 072001, [arXiv:hep-ex/0510068].

A. Zaitsev et al. [VES], Nucl. Phys. A675 (2000) 155–160.

M. Alekseev et al. [C OMPASS ], Phys. Rev. Lett. 104 (2010) 241803, [arXiv:0910.5842].

C. Adolph et al. [C OMPASS ], Phys. Rev. D 95 (2017) 032004, [arXiv:1509.00992].

M. Aghasyan et al. [C OMPASS ], Phys. Rev. D 98 (2018) 092003, [arXiv:1802.05913].

F. Krinner, D. Greenwald, D. Ryabchikov, B. Grube and S. Paul, Phys. Rev. D 97 (2018) 114008, [arXiv:1710.09849].

See data tables in HEPData




How to Cite

Krinner F. Model dependence of the π1 (1600) → ρ(770)π signal. Supl. Rev. Mex. Fis. [Internet]. 2022 Jun. 10 [cited 2022 Dec. 9];3(3):0308015 1-6. Available from: