Evidence of a dibaryon spectrum in coherent π0π0d photoproduction at forward deuteron angles

Jude, T. C.; Alef, S.; Beck, R.; Braghieri, A.; Cole, P. L.; Elsner, D.; Salvo, R. Di; Fantini, A.; Freyermuth, O.; Frommberger, F.; Ghio, F.; Goertz, Stefan; Gridnev, A.; Kohl, Katrin; Kozlenko, N.; Lapik, A.; Sandri, P. Levi; Lisin, V.; Mandaglio, G.; Moricciani, D.; Nedorezov, V.; Novinsky, D. V.; Pedroni, P.; Polonskiy, A.; Reitz, B.; Romaniuk, M.; Scheluchin, G.; Schmieden, H.; Stuglev, A.; Sumachev, V. V.; Тараканов, В. И.

doi:10.1016/j.physletb.2022.137277

Cited by 9 publications

(2 citation statements)

References 47 publications

(49 reference statements)

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“…The authors of [41,42] also studied the reaction [45,46]. This reaction was throughly studied theoretically in [47], and the authors discovered that the pion rescattering mechanisms were particularly important, and the most striking feature of the reaction, i.e., the shift of the shape of the invariant mass distributions, was well reproduced. In the reaction, η rescattering had a small effect, and only the π rescattering was relevant.…”

Section: Discussionmentioning

confidence: 99%

Sequential single pion production explaining the dibaryon "d(2380)" peak

Peralta

Ikeno

2023

Chinese Phys. C

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We study the two step sequential one pion production mechanism, $np(I=0)\to \pi^-pp$, followed by the fusion reaction $pp\to \pi^+d$, in order to describe the $np\to \pi^+\pi^-d$ reaction with $\pi^+\pi^-$ in $I=0$, where a narrow peak, so far identified with a ``$d(2380)$'' dibaryon, has been observed. We find that the second step $pp\to \pi^+d$ is driven by a triangle singularity that determines the position of the peak of the reaction and the large strength of the cross section. The combined cross section of these two mechanisms produce a narrow peak with the position, width and strength compatible with the experimental observation within the approximations done. This novel interpretation of the peak without invoking a dibaryon explains why the peak is not observed in other reactions where it has been searched for.

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Section: Discussionmentioning

confidence: 99%

Sequential single pion production explaining the dibaryon "d(2380)" peak

Peralta

Ikeno

2023

Chinese Phys. C

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“…The fitted distribution (red line) is comprised of phase space (green line) and the proposed sequential dibaryon decay (blue line). Figure adapted from Ref [14]…”

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confidence: 99%