Hadron rich and Centauro events

Abstract

An exploratory statistical analysis of the event C16S086I037 was possible to do using two simulations. A γ and hadron induced showers recognition done on this event through a best fitting procedure shows identification of 25 and 37 for γ and hadron induced showers, respectively. Assuming that the most energetic shower is the surviving particle of an interaction and the tertiary produced particles are from normal multiple pion production, the characteristics of the interaction are: Energy of primary particle E 0 = 1 , 061 TeV , Inelasticity of collision K = 0.81 , Mean inelasticity of γ -ray < k γ > = 0.27 , Hadron induced showers energy/Total energy Q h ′ = 0.90 ≈ Q h , Rapidity density N h / Δ Y = ( 8.56 – 9.89 ) , Mean energy of secondary hadrons < E h > = ( 21.5 ± 4 ) TeV , Mean transverse momentum < P T h > = ( 1.2 ± 0.2 ) GeV/c , Upper bound of partial cross section σ ⩽ ( 15 – 39 ) μ barn and life time τ ⩽ 10 −16 s . Without the surviving particle assumption, the values are: E 0 = 873 TeV , K = 1.0 , < k γ > = 1 / 3 , Q h ′ = 0.90 , N h / Δ Y = ( 8.32 – 9.34 ) , < E h > = ( 21 ± 3.5 ) TeV , < P T h > = ( 1.0 ± 0.16 ) GeV/c . Using another simulation for energy determination with χ 2 > 3.16 for best fitting results 22 and 40 for γ and hadron induced showers, respectively. Under the surviving particle assumption, the figures are: Energy of primary particle E 0 = 1 , 047 TeV , Inelasticity of collision K = 0.80 , Mean inelasticity of γ -ray < k γ > = 0.27 , Hadronic induced showers energy/Total energy Q h ′ = 0.89 ≈ Q h , Rapidity density N h / Δ Y = ( 10.25 − 13.19 ) , Mean energy of secondary hadrons < E h > = ( 19 ± 3 ) TeV , Mean transverse momentum < P T h > = ( 1.0 ± 0.2 ) GeV/c . That is, we get almost similar figures independently of simulation and a mean transverse momentum for this hadron-rich event similar to the Centauro events.