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New determination of the mass of the η meson at COSY-ANKE

P. Goslawski1,*, A. Khoukaz1,†, S. Barsov2, I. Burmeister1, D. Chiladze3,4, S. Dymov5,6, R. Gebel3, M. Hartmann3, A. Kacharava3 et al.

P. Kulessa7, A. Lehrach3, B. Lorentz3, R. Maier3, T. Mersmann1, M. Mielke1, S. Mikirtychiants3,2, H. Ohm3, M. Papenbrock1, D. Prasuhn3, T. Rausmann1, V. Serdyuk6, H. Stockhorst3, H. Ströher3, A. Täschner1, Yu. Valdau3,8, and C. Wilkin9

  • 1Institut für Kernphysik, Universität Münster, D-48149 Münster, Germany
  • 2High Energy Physics Department, Petersburg Nuclear Physics Institute, RU-188350 Gatchina, Russia
  • 3Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
  • 4High Energy Physics Institute, Tbilisi State University, GE-0186 Tbilisi, Georgia
  • 5Physikalisches Institut, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
  • 6Laboratory of Nuclear Problems, JINR, RU-141980 Dubna, Russia
  • 7H. Niewodniczanski Institute of Nuclear Physics PAN, PL-31342 Cracow, Poland
  • 8Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
  • 9Physics and Astronomy Department, UCL, Gower Street, London WC1E 6BT, United Kingdom

  • *paul.goslawski@uni-muenster.de
  • †khoukaz@uni-muenster.de
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Phys. Rev. D 85, 112011 – Published 25 June, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.112011

Abstract

A value for the mass of the η meson has been determined at the COSY-ANKE facility through the measurement of a set of deuteron laboratory beam momenta and associated He3 center-of-mass momenta in the dp→He3X reaction. The η was then identified by the missing-mass peak and the production threshold determined. The individual beam momenta were fixed with a relative precision of 3×10−5 for values around 3  GeV/c by using a polarized deuteron beam and inducing an artificial depolarizing spin resonance, which occurs at a well-defined frequency. The final-state momenta in the two-body dp→He3η reaction were investigated in detail by studying the size of the He3 momentum ellipse with the forward detection system of the ANKE spectrometer. Final alignment of the spectrometer for this high precision experiment was achieved through a comprehensive study of the He3 final-state momenta as a function of the center-of-mass angles, taking advantage of the full geometrical acceptance. The value obtained for the mass, mη=(547.873±0.005stat±0.027syst)  MeV/c2, is consistent and competitive with other recent measurements, in which the meson was detected through its decay products.

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Phys. Rev. D 85, 112011– Published 25 June, 2012
  • Received 16 April 2012

© 2012 American Physical Society

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