Experimental evidence for the exotic dibaryon d 1 ∗ $d^{\ast }_{1}$
| Autor: | A. S. Khrykin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics Photon 010308 nuclear & particles physics Nuclear Theory Hadron Bremsstrahlung Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Spectral line Nuclear physics Radiative process 0103 physical sciences Energy spectrum Invariant mass Physical and Theoretical Chemistry Nuclear Experiment 010306 general physics Nucleon |
| Zdroj: | Hyperfine Interactions. 237 |
| ISSN: | 1572-9540 0304-3843 |
| Popis: | We provide strong experimental evidence for the existence of a nonstrange exotic dibaryon with a mass of about 1956 MeV called \(d^{\ast }_{1}\)(1956). This dibaryon is expected to be stable against strong decay and decays predominantly into two nucleons (NN) via the isospin-conserving radiative process \(d^{\ast }_{1} \to NN \gamma \). First, we present the experimental evidence for the \(d^{\ast }_{1}\)(1956) found in the energy spectrum of the coincident photons emitted at ±900 from the reaction pp → ppγγ at 216 MeV. Then we give an explanation why the WASA/CELSIUS Collaboration did not find signatures of this dibaryon in its proton-proton bremsstrahlung data measured at 310 and 200 MeV. We also present signatures of this dibaryon found in experimental invariant mass spectra of photon pairs from the pp → ppγγ reaction measured by this collaboration at 1360 and 1200 MeV. These signatures provide very substantial confirmation of the existence of the \(d^{\ast }_{1}\)(1956). |
| Databáze: | OpenAIRE |
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