Search for Short Lived Particles in High Multiplicity Environment.pdf

Warsaw University Report IFD/3/92 (1992) High Energy Nuclear Collisions Group 9 9 9 1 r p A 4 Search for Short Lived Particles in High 1 Multiplicity Environment 1 v 8 0 Marek Ga´zdzicki1 and Waldemar Retyk 0 4 Institute of Experimental Physics, Warsaw University, 0 ul. Ho˙za 69, PL–00-681 Warsaw, Poland 9 9 / and x e Jan Pluta - l Institute of Physics, Warsaw University of Technology, c u ul. Koszykowa 75, PL–00-662 Warsaw, Poland n : v i X r a Abstract. A method of statistical selection of short lived particles in high multiplicity nucleus–nucleus collisions is discussed. 1present address: Institut f¨ur Kernphysik, University of Frankfurt, August Euler Str. 6, D–60486 Frankfurt, Germany 1 1 Introduction High energy nuclear collisions will produce many thousands charged particles in the central rapidity interval usually covered by tracking detectors. Among the measured charged hadrons are those which are: • directly produced in the process of strong interaction between two nu- clei, • products of decay of resonances during the hadronization process and • products of weak decays of heavy hadrons. The characteristic distance between emission points of particles originat- ing from the first two processes is of the order 1 to 100 fm; this distance can be measured only in the statistical way using particle interferometry. How- ever, the characteristic distance between weak decay poi