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Observation of structures at sim 17 and sim 38 MeV/c² in the γγ invariant mass spectra in pC, dC, and dCu collisions at textit{p}_(lab) of a few GeV/c per nucleon

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arxiv 2311.18632 v1 pith:GCV5KQFK submitted 2023-11-30 hep-ex

Observation of structures at sim 17 and sim 38 MeV/c² in the γγ invariant mass spectra in pC, dC, and dCu collisions at textit{p}_(lab) of a few GeV/c per nucleon

classification hep-ex
keywords resultsinvariantobservedsignalsgammamassmassesnucleon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The results of an analysis of the invariant mass spectra of photon pairs produced in dC, pC and dCu interactions at momenta of 2.75, 5.5 and 3.83 GeV/c per nucleon respectively, are presented. Signals in the form of enhanced structures at invariant masses of about 17 and 38 MeV/c2 are observed. The results of testing of the observed signals, including the results of the Monte Carlo simulation are presented. The test results support the conclusion that the observed signals are the consequence of detection of the particles with masses of about 17 and 38 MeV/c2 decaying into a pair of photons.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Possible Evidence for Neutral Color-Singlet $q\bar q$ Quark Matter from High-Energy Pb-Emulsion Collisions

    hep-ph 2026-04 reject novelty 7.0

    Pb-emulsion e+e- spectra at 160 A GeV are interpreted as thermal QED-deconfined quark annihilation plus Coulomb and confined QED-meson resonances, tentatively evidencing neutral color-singlet q q-bar matter.

  2. Potential for the discovery of the protophobic boson at the STCF

    hep-ph 2025-12 conditional novelty 5.0

    Detector-level simulations indicate the proposed STCF drift chamber could discover the 17 MeV protophobic X17 boson through displaced electron-positron vertices if Standard Model backgrounds stay below about 10^4 even...

  3. Possible Evidence for Neutral Color-Singlet $q\bar q$ Quark Matter from High-Energy Pb-Emulsion Collisions

    hep-ph 2026-04 unverdicted novelty 4.0

    The complex e+e- invariant mass spectrum below 50 MeV is attributed to thermal annihilation and bound states of QED-deconfined and confined neutral q bar q quark matter.