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New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment
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arxiv 1707.02848 v1 pith:NQRF37FS submitted 2017-07-10 hep-ph hep-ex
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abstract
We present a new amplitude analysis of the $\eta\pi$ $D$-wave in $\pi^- p\to \eta\pi^- p$ 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 $a_2^\prime(1700)$, and perform a comprehensive analysis of their pole positions. For the mass and width of the $a_2$ we find $M=(1307 \pm 1 \pm 6)$~MeV and $\Gamma=(112 \pm 1 \pm 8)$~MeV, and for the excited state $a_2^\prime$ we obtain $M=(1720 \pm 10 \pm 60)$~MeV and $\Gamma=(280\pm 10 \pm 70)$~MeV, respectively.
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Cited by 2 Pith papers
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Finite-volume quantization condition from the $N/D$ representation
hep-lat 2024-11 conditional novelty 7.0 of 10
A finite-volume quantization condition based on the N/D representation is derived and claimed to remain valid when the energy coincides with left-hand cuts, where the original Luescher condition fails.
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Production Effects and Final-state Interactions in $\pi_1 \to 3\pi$
hep-ph 2026-07 conditional novelty 6.0 of 10
A Khuri-Treiman model with contact and one-pion-exchange production terms fits COMPASS's π1→3π freed-isobar data and produces a smooth 1.6 GeV structure in the extracted production strengths.
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