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New analysis of eta pi tensor resonances measured at the COMPASS experiment

Jackura A. Indiana University Bloomington, Department of Physics
Slunečka Miloš, Ing. Faculty of Mathematics and Physics, Charles University in Prague, JINR Dubna
Smolík Jan, Mgr. Ph.D. Faculty of Nuclear Sciences and Physical Engineering CTU
Taševský  Marek, Mgr. Ph.D. Institute of Physics ASCR
et al.  different institutions


Scientific journal
Physics Letters B, 779, 464-472


We present a new amplitude analysis of the eta pi D-wave in the reaction pi(-) p -> eta pi(-) p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a(2)(1320) and the excited a(2)(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a(2) we find M = (1307 +/- 1 6) MeV and Gamma=(112 +/- 1 +/- 8) MeV, and for the excited state a(2)' we obtain M = (1720 +/- 10 +/- 60) MeV and Gamma = (280 +/- 10 +/- 70) MeV, respectively. (C) 2018 The Author(s). Published by Elsevier B.V.

Cite article as:
A. Jackura, M. Slunečka, J. Smolík, M. Taševský , . et al., "New analysis of eta pi tensor resonances measured at the COMPASS experiment", Physics Letters B, 779, 464-472 (2018)