Production of a New Light Neutral Boson in High-Energy Collisions

El‐Nadi, M.; Badawy, O. E.

doi:10.1103/physrevlett.61.1271

Cited by 26 publications

(31 citation statements)

References 8 publications

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“…This result constrains the interpretation of the e *e ~ events seen in emulsions [11,12]. For example, a spinzero Xo with mass 1.14 MeV/c 2 and lifetime 1.3xlO" 15 sec would yield 4700 events in Fig.…”

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confidence: 59%

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Search for short-lived particles produced in an electron beam dump

et al. 1991

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confidence: 59%

“…More recently, the production of e + e ~ pairs by heavy ions in emulsion has been presented [11,12] as evidence for new neutral bosons with masses less than 10 MeV/c 2 and lifetimes between 3 x 10 ~1 6 and 1.5 x 10 "' 5 sec.…”

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confidence: 99%

Search for short-lived particles produced in an electron beam dump

et al. 1991

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“…Here, we report the results of neutral boson through the kinematical analysis of 121 measured (e + epairs) found in 200A GeV 32 S interactions with emulsion, as well as pairs from collisions of 12 C and 22 Ne at 4.5A GeV/c [5]. A clear example of 8 events is selected to explain explicitly the production of these pairs in view of the associated projectile fragments having notable charge.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, El-Nadi and Badawy [5] found several experimental results where (e + epairs) were produced in the interactions with emulsion fragments resulting from collision of 12 C and 22 Ne projectiles at ∼ 4.5 GeV/c/nucleon. They used stack of nuclear emulsion rather than using modern electronic detectors joined to a huge heavy ion accelerator.…”

Section: Introductionmentioning

confidence: 99%

Origin Of The Light Neutral Boson Observed In Heavy Ion Collisions

El–Nagdy

Abdelsalam

Badawy

2007

AIP Conference Proceedings

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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.

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“…The general conclusion from these studies has been that no connection exists between the positron peaks observed at GSI and axions [l]. Quite recently we became aware of a nuclear emulsion study [2] where e+e-pairs were reported, which could be due to the decay of light neutral particles. In an independent analysis [3,4] three event clusters appeared around masses of 1.2 (0.2), 2.1 (0.4) and 9.2 (1.2) MeV c -~ and respective lifetimes of 1.3 (0.3) x 3.0 (0.5) x and 6.0 (1.0) x s respectively.…”

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confidence: 99%