Origin Of The Light Neutral Boson Observed In Heavy Ion Collisions

Abstract

We report the results of (e + epairs) produced during the interactions of 200A GeV 32 S with emulsion nuclei. The results for the electron pairs suggest that they originate from light neutral bosons emitted during the collision. The origin of such neutral bosons could be due to de-excitation of the produced fragments 4 He, 8 Be and 12 C resulting in 32 S fragmentation. The masses of the neutral bosons were estimated from electron kinematics and found to be equal 1.51±0.14 and 9.88±2.85 MeV/c 2 and life time of orders 10 -16 -10 -15 s. The data and results obtained could explain and put conclusion to the puzzles which were going on during the last 50 years around the anomalous mean free path of αparticles produced during high energy particle collisions. The depression of average shower particle multiplicities produced in the collisions of secondary helium fragments as compared to those of primary helium at similar energy signs the possibility of formation of the neutral boson.

Comment on "Search for new particles decaying into electron pairs of mass below 100 MeV/c^2"

“…A re-analysis of the data presented in Fig. 1f indicates presumed neutral particle X invariant masses of 1.5 to 21 MeV/c 2 , with lifetimes between 10 −16 and 10 −14 s. This mass and lifetime range are consistent with previous indications of light neutral particles decaying to e + e − from cosmic ray [2][3], emulsion bombardment [4][5][6][7][8][9] and nuclear decay [10][11][12][13][14][15][16] data.…”

“…Evidence for neutral particles with masses less than 10 MeV decaying into e + e − pairs has previously been reported from cosmic ray [2,3], emulsion bombardment [4][5][6][7][8][9] and nuclear decay [10][11][12][13][14][15][16] data. The structure of these particles is unknown.…”

Charge spectra of projectile fragmentation at relativistic energy

“…Whereas other charge projectile fragments production shows mixed nature. [12], 56 Fe at 1.88 A GeV [12,13], 84 Kr at 1.52 A GeV [3,12], 131 Xe at 1.22 A GeV [12], 197 Au at 0.99 [12,13], 238 U at 0.96 A GeV [3,12]. A GeV [3,12], 84 Kr at 1.40 -1.10 [3,13], 84 Kr at 0.95 A GeV [Present work], 84 Kr at 0.70-0.50 A GeV [3].…”