Physics Letters B (Sep 2022)
Evidence of a dibaryon spectrum in coherent π0π0d photoproduction at forward deuteron angles
- T.C. Jude,
- S. Alef,
- R. Beck,
- A. Braghieri,
- P.L. Cole,
- D. Elsner,
- R. Di Salvo,
- A. Fantini,
- O. Freyermuth,
- F. Frommberger,
- F. Ghio,
- A. Gridnev,
- K. Kohl,
- N. Kozlenko,
- A. Lapik,
- P. Levi Sandri,
- V. Lisin,
- G. Mandaglio,
- D. Moricciani,
- V. Nedorezov,
- D. Novinskiy,
- P. Pedroni,
- A. Polonskiy,
- B.-E. Reitz,
- M. Romaniuk,
- G. Scheluchin,
- H. Schmieden,
- A. Stuglev,
- V. Sumachev,
- V. Tarakanov
Affiliations
- T.C. Jude
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany; Corresponding author.
- S. Alef
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- R. Beck
- Rheinische Friedrich-Wilhelms-Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, 53115 Bonn, Germany
- A. Braghieri
- INFN sezione di Pavia, Via Agostino Bassi, 6, 27100 Pavia, Italy
- P.L. Cole
- Lamar University, Department of Physics, Beaumont, TX, 77710, USA
- D. Elsner
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- R. Di Salvo
- INFN Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Rome, Italy
- A. Fantini
- INFN Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Rome, Italy; Università di Roma “Tor Vergata”, Dipartimento di Fisica, Via della Ricerca Scientifica 1, 00133, Rome, Italy
- O. Freyermuth
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- F. Frommberger
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- F. Ghio
- INFN sezione di Roma La Sapienza, P.le Aldo Moro 2, 00185, Rome, Italy; Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
- A. Gridnev
- Petersburg Nuclear Physics Institute NRC “Kurchatov Institute”, Gatchina, Leningrad District, 188300, Russia
- K. Kohl
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- N. Kozlenko
- Petersburg Nuclear Physics Institute NRC “Kurchatov Institute”, Gatchina, Leningrad District, 188300, Russia
- A. Lapik
- Russian Academy of Sciences, Institute for Nuclear Research, Prospekt 60-letiya Oktyabrya 7a, 117312, Moscow, Russia
- P. Levi Sandri
- INFN - Laboratori Nazionali di Frascati, Via E. Fermi 54, 00044, Frascati, Italy
- V. Lisin
- Russian Academy of Sciences, Institute for Nuclear Research, Prospekt 60-letiya Oktyabrya 7a, 117312, Moscow, Russia
- G. Mandaglio
- INFN sezione Catania, 95129, Catania, Italy; Università degli Studi di Messina, Dipartimento MIFT, Via F. S. D'Alcontres 31, 98166, Messina, Italy
- D. Moricciani
- INFN Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Rome, Italy; INFN - Laboratori Nazionali di Frascati, Via E. Fermi 54, 00044, Frascati, Italy
- V. Nedorezov
- Russian Academy of Sciences, Institute for Nuclear Research, Prospekt 60-letiya Oktyabrya 7a, 117312, Moscow, Russia
- D. Novinskiy
- Petersburg Nuclear Physics Institute NRC “Kurchatov Institute”, Gatchina, Leningrad District, 188300, Russia
- P. Pedroni
- INFN sezione di Pavia, Via Agostino Bassi, 6, 27100 Pavia, Italy
- A. Polonskiy
- Russian Academy of Sciences, Institute for Nuclear Research, Prospekt 60-letiya Oktyabrya 7a, 117312, Moscow, Russia
- B.-E. Reitz
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- M. Romaniuk
- INFN Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Rome, Italy; Institute for Nuclear Research of NASU, 03028, Kyiv, Ukraine
- G. Scheluchin
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- H. Schmieden
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- A. Stuglev
- Petersburg Nuclear Physics Institute NRC “Kurchatov Institute”, Gatchina, Leningrad District, 188300, Russia
- V. Sumachev
- Petersburg Nuclear Physics Institute NRC “Kurchatov Institute”, Gatchina, Leningrad District, 188300, Russia
- V. Tarakanov
- Petersburg Nuclear Physics Institute NRC “Kurchatov Institute”, Gatchina, Leningrad District, 188300, Russia
- Journal volume & issue
-
Vol. 832
p. 137277
Abstract
The coherent reaction, γd→π0π0d was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and π0 decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63GeV/c2. A low mass enhancement in the π0π0 invariant mass is also observed at the d⁎(2380) centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the π0d invariant mass at 2114MeV/c2 with a width of 20MeV/c2 supports a sequential two-dibaryon decay mechanism.
