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Il Nuovo Cimento C

, Volume 11, Issue 1, pp 51–65 | Cite as

Collisons in space experiments at high energies, laboratory experiments and suggested signatures of quark-gluon plasma: an alternative approach to the analysis of actual observations

  • S. Bhattacharyya
Article

Summary

In recent times there have been widespread speculations and claims among the cosmic-ray as well as high-energy physicists about the detection of some «signatures» for the formation of what one calls the quark-gluon plasma states in the ultrahigh-energy cosmic-ray collisions involving heavy nuclei. Furthermore, there are reportedly some hints to the detection of such states in laboratory experiments as well. We have collected here what are, in general, believed to be the diagnostics for such quark-gluon plasma states and have also provided alternative explanations for all the relevant observations at laboratory energies and cosmic-ray energies. Thus the obvious conclusion is: the evidences claimed so far are neither unique and decisive nor are very substantial, tenable and conclusive, as one can understand them almost completely from an altogether different theoretical framework.

PACS. 94.40

Cosmic rays 

Riassunto

In tempi recenti vi sono state diffuse ipotesi ed affermazioni tra i fisici che si occupano dei raggi cosmici e dell'alta energia sulla scoperta di alcune «impronte» per la formazione di quelli che si chiamano stati di plasma tra quark e gluoni in collisioni di raggi cosmici ad energia ultra alta che coinvolgono nuclei pesanti. Inoltre vi sono alcuni indizi a quanto viene riferito per la rivelazioni di questi stati anche negli esperimenti di laboratorio. Qui abbiamo raccolto quella che è in generale ritenuta la diagnostica per questi stati di plasma fra quark e gluoni ed abbiamo inoltre fornito spiegazioni alternative per tutte le osservazioni relative ad energie di laboratorio ed energie di raggi cosmici. Cosí la conclusione ovvia è: le prove non si sono dimostrate né uniche e decisive, né importanti, sostenibili e conclusive, come le si può ritenere quasi completamente da un modello teorico completamente diverso.

Резюме

В последнее время в физике космических лучей и физике высоких энергий интенсивно обсуждается вопрос детектирования некоторых «сигнатур» для образования так называемых состояний кварк-глюонной плазмы при соударениях космических частиц ультравысоких энергий, включая тяжелые ядра. Более того, были также публикации о предлагаемом детектировании таких состояний в лабораторных экспериментах. В этой работе анализируется диагностика таких состояний кварк-глюонной плазмы, а также предлагаются альтернативные объяснения всех имеющихся наблюдений при лабораторных и космических энергиях. На основе анализа делается очевидный вывод: данные наблюденй пока не являются достаточными, чтобы их можно было бы понять из полностью друтих теоретических подходов.

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Copyright information

© Società Italiana di Fisica 1988

Authors and Affiliations

  • S. Bhattacharyya
    • 1
  1. 1.Physical and Earth Sciences DivisionIndian Statistical InstituteCalcuttaIndia

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