Observation of Gaussian Pseudorapidity Distributions for Produced Particles in Proton-Nucleus Collisions at Tevatron Energies
Аннотация
The statistical event-by-event analysis of inelastic interactions of protons in emulsion at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mn mathvariant="normal">800</mml:mn></mml:mrow></mml:math> GeV reveals the existence of group of events with Gaussian pseudorapidity distributions for produced particles, as suggested by hydrodynamic-tube model. Events belong to very central collisions of protons with heavy emulsion nuclei with probability of realization of less than <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mn mathvariant="normal">1</mml:mn></mml:mrow></mml:math>% and with multiplicity of shower particles exceeding (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M3"><mml:mn mathvariant="normal">2</mml:mn><mml:mo>-</mml:mo><mml:mn mathvariant="normal">3</mml:mn></mml:math> times) the average multiplicity in proton-nucleus collisions in emulsion. Bjorken’s energy density for these events reaches <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M4"><mml:mrow><mml:mn mathvariant="normal">2.0</mml:mn></mml:mrow></mml:math> GeV per <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M5"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">f</mml:mi><mml:mi mathvariant="normal">m</mml:mi></mml:mrow><mml:mrow><mml:mn mathvariant="normal">3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>. The data are interpreted as a result of the QCD phase transition in proton-tube collisions at Tevatron energies.