External electron pair production in high-energy collisions

El‐Nadi, M.; Kamel, S.; Hussein, A.; Abou-Moussa, Z.; Shaat, E. A.; Salama, H. S.; Osman, W.

doi:10.1007/bf02778236

Cited by 10 publications

(36 citation statements)

References 16 publications

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“…We selected a clear examples of 8 direct (e + epairs) for which the charges of projectile fragments and its energy level have been carried out. The data indicates the production of clusters "A" and "C" obtained before by De Boer and van Dantzig [9], discussion of the Cairo [5,9] and Bristol data [13]. The mass -lifetime distribution plot is given in Fig.…”

Section: Dileptons (E + E -Pairs)mentioning

confidence: 84%

“…Details of the experimental setup, scanning of the pellicles, and event classification can be found in Refs [9,10]. Details of the experimental setup, scanning of the pellicles, and event classification can be found in Refs [9,10].…”

Section: Methodsmentioning

confidence: 99%

“…Cairo high-energy group reported a previous work [9,10] in which 1351 inelastic interactions of 200A GeV 32 S with emulsion nuclei were considered. In this work we studied 121 fully measured (e + epairs) of the previous work as well as pairs from collisions of 12 C and 22 Ne at 4.5A GeV/c [5].…”

Section: Dileptons (E + E -Pairs)mentioning

confidence: 99%

“…In addition, El-Nadi [9] suggested the subsequent decay of four short-lived neutral bosons of average masses 1.8, 2.3, 2.6 and 12.2 MeV/c 2 with lifetime of order 10 -15 -10 -16 s in the interactions of 200A GeV 32 S ions with emulsion nuclei.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Dileptons (E + E -Pairs)mentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Dileptons (E + E -Pairs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Origin Of The Light Neutral Boson Observed In Heavy Ion Collisions

El–Nagdy

Abdelsalam

Badawy

2007

AIP Conference Proceedings

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“…For over 50 years, measurements of e + e − pair production by energetic ions incident on emulsion detectors have yielded events with opening angles at the e + − e − vertex larger than those expected [1] for external pair conversion (EPC) by photons [2,3,4,5,6,7,8,9,10,11]. On the basis of relatively small data sets, El-Nadi and Badawy [6] and de Boer and van Dantzig [12] proposed in 1988 that such events might represent the decays of neutral bosons with masses considerably larger than generally expected for Weinberg-Wilczek axions.…”

Section: Introductionmentioning

confidence: 99%

A Reevaluation of Evidence for Light Neutral Bosons in Nuclear Emulsions

Boer¹,

Fields

2011

Int. J. Mod. Phys. E

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Electron-positron pair-production data obtained by bombardment of emulsion detectors with either cosmic rays or projectiles with masses between one and 207 amu and kinetic energies between 18 GeV and 32 TeV have been re-analysed using a consistent and conservative model of the background from electromagnetic pair conversion. The combined data yield a spectrum of putative neutral bosons decaying to e + e − pairs, with masses between 3 and 20 MeV/c 2 and femtosecond lifetimes. The statistical significance against background for these "X-bosons" varies between 2 and 8 σ. The cross-section for direct production of X-bosons increases slowly with projectile energy, remaining over 1,000 times smaller than the pion production cross-section. * Deceased

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Open string QED meson description of the X17 particle and dark matter

Wong

2020

J. High Energ. Phys.

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As a quark and an antiquark cannot be isolated, the intrinsic motion of a composite qq system in its lowest-energy states lies predominantly in 1+1 dimensions, as in an open string with the quark and the antiquark at its two ends. Accordingly, we study the lowest-energy states of an open string qq system in QCD and QED in 1+1 dimensions. We show that π 0 , η, and η can be adequately described as open string qq QCD mesons. By extrapolating into the qq QED sector in which a quark and an antiquark interact with the QED interaction, we find an open string isoscalar I(J π) = 0(0 −) QED meson state at 17.9±1.5 MeV and an isovector (I(J π) = 1(0 −), I 3 = 0) QED meson state at 36.4±3.8 MeV. The predicted masses of the isoscalar and isovector QED mesons are close to the masses of the hypothetical X17 and E38 particles observed recently, making them good candidates for these particles. The decay products of QED mesons may show up as excess e + e − and γγ pairs in the anomalous soft photon phenomenon associated with hadron productions in high-energy hadron-proton collisions and e +-e − annihilations. Measurements of the invariant masses of excess e + e − and γγ pairs will provide tests for the existence of the open string qq QED mesons. An assembly of gravitating QED mesons are expected to emit electron-positron pairs and/or gamma rays and their decay energies and lifetimes will be modified by their gravitational binding energies. Consequently, a self-gravitating isoscalar QED meson assembly whose mass M and radius R satisfy (M/M)/(R/R) 4.71 × 10 5 will not produce electron-positron pairs nor gamma rays and may be a good candidate for the primordial dark matter.

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External electron pair production in high-energy collisions

Cited by 10 publications

References 16 publications

Origin Of The Light Neutral Boson Observed In Heavy Ion Collisions

Origin Of The Light Neutral Boson Observed In Heavy Ion Collisions

A Reevaluation of Evidence for Light Neutral Bosons in Nuclear Emulsions

Open string QED meson description of the X17 particle and dark matter

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