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18 April 2024

» arxiv » hep-ex/0505006

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A precision determination of the mass of the $eta$ meson
The GEM collaboration: M. Abdel-Bary ; A. Budzanowski ; A. Chatterjee ; J. Ernst ; P. Hawranek ; R. Jahn ; V. Jha ; K. Kilian ; S. Kliczewski ; D. Kirillov ; D. Kolev ; M. Kravcikova ; T. Kutsarova ; M. Lesiak ; J. Lieb ; H. Machner ; A. Magiera ; R. Maier ; G. Martinska ; S. Nedev ; N. Piskunov ; D. Prasuhn ; D. Proti’c ; P. von Rossen ; B. J. Roy ; I. Sitnik ; R. Siudak ; M. Smiechowicz ; H. J. Stein ; R. Tsenov ; M. Ulicny ; J. Urban ; G. Vankova ; G. Vankova ;
Date:	4 May 2005
Journal:	Phys.Lett. B619 (2005) 281-287
Subject:	hep-ex nucl-ex
Abstract:	Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the $eta$ meson is seen clearly as a sharp missing--mass peak on a slowly varying background in the $p+d o ^3 extrm{He} +X$ reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the $eta$ meson. The final result, $m(eta)=547.311pm 0.028 extrm{(stat)} pm 0.032 extrm{(syst) MeV/c}^2$, is significantly lower than that found by the recent NA48 measurement, though it is consistent with values obtained in earlier counter experiments.
Source:	arXiv, hep-ex/0505006
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