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A Multidimensional Study of Clustering in the Reactions π ± p → p π + π ± π − at 16 GeV/c using the Yang Variables
Author(s) -
Honecker R.,
Laven H.,
Schmitz P.,
Becker L.,
Lanius K.,
Naumann T.,
Schiller H.,
Zobernig G.,
Kostka P.,
Morrison D. R. O.,
Schmid P.,
Triantis F. A.,
Stopa P.,
Wojcik W.
Publication year - 1979
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19794910307
Subject(s) - physics , dissociation (chemistry) , phase space , proton , cluster (spacecraft) , cluster analysis , resonance (particle physics) , pion , atomic physics , nuclear physics , statistics , quantum mechanics , chemistry , mathematics , computer science , programming language
The clustering of events in 7‐dimensional phase space is studied in the reactions π ± p → p π + π ± π − at 16GeV/c. The Yang variables are used for locating events in the phase space. Clusters are defined and events are allocated by a novel iterative technique. This is based on a measure of the distance of each event from the cluster center, weighted by the covariance matrix of the event density. The clusters found are then related to reaction mechanisms such as diffraction dissociation of pion and proton, resonance production, etc. High mass enhancements in the (3π) system and in the ( p π + π − ) system are identified and separated from other mechanisms. Cross sections are given for individual sub‐channels and compared to results obtained by other techniques.