z Scaling at RHIC

Abstract

The concept of z-scaling reflecting the general regularities of high-p T particle production is reviewed. Properties of data z-presentation are discussed. New data on high-p T particle spectra obtained at the RHIC are analyzed in the framework of z-presentation. It was shown that these experimental data confirm z-scaling. Predictions of strange particle spectra are considered to be useful for understanding of strangeness origin in mesons and baryons and search for new physics phenomena at the RHIC.

Self-similarity of hadron production: z-scaling

“…This regularity is useful for studying collective phenomena in hadron and nuclear matter [14]- [16]. The concept of this scaling [17]- [19] was used to analyze the inclusive spectra obtained at the U70, SppS, SPS, ISR, Tevatron, and RHIC accelerators [16], [20]- [25]. The experimental spectra in the z-representation show a striking similarity over a wide range of kinematic variables.…”

“…is the z-scaling [17]- [19]. It was proposed to express general regularities found in the inclusive hadron production in high-energy proton-(anti)proton and nucleusnucleus collisions [20]- [25], [34]. The scaling is manifested in the inclusive spectra of various types of particles being describable by a universal scaling function Ψ(z).…”

Self-similarity of hadron production: $z$-Scaling

“…), является z-скейлинг [17]- [19]. Он был предложен для того, чтобы выразить общие закономерности, обнаруженные в процессах инклюзивного рождения адронов при столковениях протон-(анти)протон и ядро-ядро при высоких энергиях [20]- [25], [34]. Скейлинг проявляется в том, что инклюзивные спектры частиц различного типа можно описывать при помощи универсальной скейлинговой функции Ψ(z).…”

“…Эта закономерность полезна при изучении коллективных явлений в адронной и ядерной материи [14]- [16]. Концепция скейлинга [17]- [19] использовалась при анализе инклюзивных спектров адронов, полученных на ускорителях U70, SppS, SPS, ISR, Tevatron и RHIC [16], [20]- [25]. Экспериментальные спектры в z-представлении демонстрируют удивительное сходство друг с другом в широком интервале кинематических переменных.…”

Self-similarity of strangeness production in pp collisions at RHIC

“…The scaling behavior of particle production related to self-similarity of hadron interactions at constituent level is manifested by the z-scaling [1,2]. The concept of this scaling was used for analysis of inclusive spectra obtained at the accelerators U70, SppS, SPS, ISR, Tevatron and RHIC [3]- [9]. The experimental spectra reveal striking similarity over a wide range of kinematic variables when expressed by the variable z.…”