Intra- and intergroup azimuthal correlations of particles in the interaction of gold nuclei with silver and bromine nucl
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EMENTARY PARTICLES AND FIELDS Experiment
Intra- and Intergroup Azimuthal Correlations of Particles in the Interaction of Gold Nuclei with Silver and Bromine Nuclei of Track Emulsions at the Projectile Energy of 10.6 GeV per Nucleon U. U. Abdurakhmanov* , K. G. Gulamov, S. I. Zhokhova, and V. Sh. Navotny** Institute for Physics and Technology, Fizika-Solntse Research and Production Association, Uzbek Academy of Sciences, ul. G. Mavlyanova 2b, Tashkent, 700084 Republic of Uzbekistan Received December 5, 2008; in final form, June 29, 2009
Abstract—Inter- and intragroup azimuthal correlations of target and projectile fragments and of shower particles in the interactions between gold nuclei of energy 10.6 GeV per nucleon and silver and bromine nuclei of a track emulsion are studied at intermediate values of the impact parameter. The asymmetry index β1 and the collinearity index β2 of groups’ asymmetry vectors are used to study azimuthal correlations between two and three groups of particles. The interplay of effects of intra- and intergroup azimuthal particle correlations is investigated. DOI: 10.1134/S106377881001014X
1. INTRODUCTION A great number of studies [1–12] have been devoted to exploring correlation phenomena accompanying the formation of hot strongly compressed nuclear matter—in particular, collective-flow phenomena—in various nucleus–nucleus collisions at primary energies in the range 1–160 GeV per nucleon. Among these studies, there are those that employ track emulsions. Various methods [12–16] were used there to investigate special features of processes involving the emission of target and projectile fragments and of shower particles. The method of studying azimuthal particle correlations by means of the asymmetry index β1 and the collinearity index β2 of particle-transversemomentum vectors [17] proved long ago its efficiency in exploring hadron–nucleon and hadron–nucleus interactions. Later on, this method was successfully used to discover intragroup azimuthal particle correlations in nucleus–nucleus interactions [12]. However, the potential of the method has not been exhausted completely, and the method will be applied here in studying intergroup azimuthal particle correlations. The possibility of studying azimuthal correlations not only between two but also between three (or even more) groups of particles is one of the advantages of the method in question. Azimuthal correlations between three particle groups have never been studied to date. If use is simultaneously made * **
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of the asymmetry index β1 and the collinearity index β2 of groups’ asymmetry vectors—for example, the β1 –β2 two-dimensional plot—it is possible to study intergroup azimuthal correlations not only of the asymmetry or quasicollinearity type but also of other types of correlations in the relative positions of particle groups in the azimuthal plane. The application of the quantities βk and βk makes it possible to study the interplay of intra- and intergroup azimuthal particle co
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