New analysis of ηπ tensor resonances measured at the COMPASS experiment

JPAC Collaboration, COMPASS Collaboration

Research output: Contribution to journalArticlepeer-review


We present a new amplitude analysis of the ηπ D-wave in the reaction πp→ηπp 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 a2(1320) and the excited a2 (1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M=(1307±1±6) MeV and Γ=(112±1±8) MeV, and for the excited state a2 we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.

Original languageEnglish (US)
Pages (from-to)464-472
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Apr 10 2018

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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