Abnormal photonic energy ? a signal of Quark matter possibly seen in exotic cosmic ray events

Abstract

A phenomenological method is proposed to select possible Quark matter forming events in ultra-relativistic nucleus-nucleus interactions. We compare the released photonic and hadronic energies from a Quark matter forming event and from a normal Hadronic event and derive a relation, which may be used in an event-by-event analysis to differentiate the two phases. We determine thus two regions of QCD deconfinement. We also discuss the hadronic, photonic energy and multiplicity contents and the (PT) of several exotic cosmic ray events at ultra high energies. On the basis of the phenomenological model, we suggest that the "Centauro" type are Quark matter events near the projectile fragmentation region with very large baryochemical potential, ~b. The "Anti-Centauro" type events are created by vacuum excitation in the central region with near zero #b-PACS: 25.70.Np; 12.38.Mh; 96.40.Mn

Possibility of observing "Centauro" events at the BNL Relativistic Heavy Ion Collider

“…[5] for the Centauro events and we also suggest the possible formation of strangelets in the very baryon-rich environment of the fireball (Sec. 111).…”

Exotic characteristics of Centauro-I: Reexamination of the Centauro event

“…In summary, the showers found in the lower chamber are originated by hadrons except those of categories (4) and (5), which can be identified easily.…”

“…The experimental distribution agrees well with that of simulated C-jets and we can see a peak at m 100-150 MeV=c 2 , indicating that showers are due to 0 decay. 5 We also apply the above procedure of clustering and invariant mass calculation to the six events shown in Fig. 5(b), which are the simulated events of narrow atmospheric families.…”

“…(1) C-jets, (2) Pb-jets in the lower chamber, (3) Pb-jets in the upper chamber whose showers continue into the lower chamber, (4) high energy rays, incident upon the upper chamber, whose showers continue into the lower chamber, (5) showers which are produced by particles, incident upon the lower chamber directly without passing the upper chamber. In summary, the showers found in the lower chamber are originated by hadrons except those of categories (4) and (5), which can be identified easily.…”

“…These proposals can be classified into two categories: an exotic primary (exotic component among the primary cosmic rays) or an exotic interaction. The former includes a quark glob [3,4], strange quark matter [5,6], etc., and the latter includes multiple production of nucleons [2], coherent production of particles [7,8], DCC (disoriented chiral condensate) [9], etc.…”