publication . Article . Other literature type . Preprint . 2018

New analysis of ηπ tensor resonances measured at the COMPASS experiment

Ondřej Šubrt; Ana Sofia Nunes; Jan Friedrich; Márcia Quaresma; Aram Kotzinian; Andrzej Rychter; Antonín Květoň; Annika Thiel; Boris Grube; Jan Matousek; ...
Open Access English
  • Published: 01 Jan 2018
  • Publisher: HAL CCSD
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.
Subjects
arXiv: Nuclear Experiment
free text keywords: Physics and Astronomy, PP INTERACTIONS, 450 GEV/C, MESONS, CONNECTION, UNITARITY, EXCHANGE, MATRIX, hep-ex, Particle Physics - Experiment, hep-ph, Particle Physics - Phenomenology, a2(1700), a2(1320), pomeron, S-matrix, analytic properties, meson resonance, excited state, amplitude analysis, COMPASS, 11.80.Et, 11.55.Fv, 11.55.Bq, 14.40.Be, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear and High Energy Physics, 530, M162W, M162M, M012W3, M012M3, High Energy Physics - Phenomenology, High Energy Physics - Experiment, Physics, QC1-999, Nuclear and high energy physics; peripheral photoproduction; physics, ddc:530
Funded by
NSF| A Program of Medium Energy Nuclear Physics
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1506416
,
NSF| Extensible Computational Services for Discovery of New Particles
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1415459
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Physics
,
EC| HADRONPHYSICS3
Project
HADRONPHYSICS3
Study of Strongly Interacting Matter
  • Funder: European Commission (EC)
  • Project Code: 283286
  • Funding stream: FP7 | SP4 | INFRA
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