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

Medientyp: E-Artikel

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

Beteiligte: Goslawski, P. [Verfasser:in]; Khoukaz, A. [Verfasser:in]; Lehrach, A. [Verfasser:in]; Lorentz, Bernd [Verfasser:in]; Maier, Rudolf [Verfasser:in]; Mersmann, T. [Verfasser:in]; Mielke, M. [Verfasser:in]; Mikirtytchiants, Sergey [Verfasser:in]; Ohm, Henner [Verfasser:in]; Papenbrock, M. [Verfasser:in]; Prasuhn, Dieter [Verfasser:in]; Rausmann, T. [Verfasser:in]; Barsov, S. [Verfasser:in]; Serdyuk, V. [Verfasser:in]; Stockhorst, Hans [Verfasser:in]; Stroeher, Hans [Verfasser:in]; Täschner, A. [Verfasser:in]; Valdau, Y. [Verfasser:in]; Wilkin, C. [Verfasser:in]; Burmeister, I. [Verfasser:in]; Chiladze, D. [Verfasser:in]; Dymov, S. [Verfasser:in]; Gebel, Ralf [Verfasser:in]; Hartmann, Michael [Verfasser:in]; [...]

Erschienen: Soc., 2012

Sprache: Englisch

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

ISSN: 0556-2821; 1550-2368; 1089-4918; 1550-7998

Schlagwörter: deuteron: polarized beam ; eta: mass: measured ; spin: resonance ; ANKE ; p deuteron: nuclear reaction ; depolarization ; Juelich COSY PS ; calibration ; experimental results ; threshold ; data analysis method ; deuteron p --> helium eta ; mass spectrum: missing-mass ; eta: hadroproduction ; 1.57-1.59 GeV/c/nucleon ; kinematics

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Beschreibung: A value for the mass of the eta meson has been determined at the COSY-ANKE facility through the measurement of a set of deuteron laboratory beam momenta and associated 3He center-of-mass momenta in the d+p -> 3He+X reaction. The eta 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 x 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 d+p -> 3He+eta reaction were investigated in detail by studying the size of the 3He 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 3He 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, m(eta)=(547.873 +- 0.005(stat) +- 0.027(syst)) MeV/c^2, is consistent and competitive with other recent measurements, in which the meson was detected through its decay products.

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