First observation ofΩ* resonances

Authors :: Biagi, S. F.
Bourquin, M.
Brown, R. M.
Burckhart, H. J.
Doré, Ch.
Extermann, P.
Gailloud, M.
Gee, C. N. P.
Gibson, W. M.
Gray, R. J.
Jacot-Guillarmod, P.
Jeffreys, P. W.
Modis, T.
Owen, R. C.
Perrier, J.
Ragan, K. J.
Rosselet, Ph.
Saunders, B. J.
Schirato, P.
Siebert, H. W.
Smith, V. J.
Streit, K. P.
Thresher, J. J.
Weill, R.
Wood, A. T.
Yanagisawa, C.
Source :: Zeitschrift für Physik C Particles and Fields; March 1986, Vol. 31 Issue: 1 p33-38, 6p
Publication Year :: 1986
Abstract: In a experiment at the CERN SPS charged hyperon beam using incident ?<superscript>-</superscript>, we have obtained evidence for the production of two O<superscript>*</superscript> resonances decaying into ?<superscript>-</superscript>p<superscript>+</superscript>K<superscript>-</superscript>, with the following parameters:M<subscript>1</subscript>=2251±12,G<subscript>1</subscript>=48±20 MeV/c<superscript>2</superscript>, 78 ±23 events, andM<subscript>2</subscript>=2284±12,G<subscript>2</subscript>=26±23 MeV/c<superscript>2</superscript> 45±10 events. The first state is also observed as a 4.2s effect in a subsample which contains an additionalK<superscript>+</superscript> orK<superscript>0</superscript> in the final state. Production cross sections and branching ratios to ?<superscript>*</superscript>K<superscript>-</superscript> and ?<superscript>-</superscript>K<superscript>*</superscript> are presented.