Physics Letters B (Sep 2021)
Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer
- T.C. Jude,
- S. Alef,
- P. Bauer,
- D. Bayadilov,
- R. Beck,
- A. Bella,
- J. Bieling,
- A. Braghieri,
- P.L. Cole,
- D. Elsner,
- R. Di Salvo,
- A. Fantini,
- O. Freyermuth,
- F. Frommberger,
- F. Ghio,
- S. Goertz,
- A. Gridnev,
- D. Hammann,
- J. Hannappel,
- K. Kohl,
- N. Kozlenko,
- A. Lapik,
- P. Levi Sandri,
- V. Lisin,
- G. Mandaglio,
- F. Messi,
- R. Messi,
- D. Moricciani,
- V. Nedorezov,
- V.A. Nikonov,
- D. Novinskiy,
- P. Pedroni,
- A. Polonskiy,
- B.-E. Reitz,
- M. Romaniuk,
- A.V. Sarantsev,
- G. Scheluchin,
- H. Schmieden,
- A. Stuglev,
- V. Sumachev,
- V. Vegna,
- V. Tarakanov,
- T. Zimmermann
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
- P. Bauer
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- D. Bayadilov
- Rheinische Friedrich-Wilhelms-Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, 53115 Bonn, Germany; Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
- R. Beck
- Rheinische Friedrich-Wilhelms-Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, 53115 Bonn, Germany
- A. Bella
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- J. Bieling
- 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
- S. Goertz
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- A. Gridnev
- Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
- D. Hammann
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- J. Hannappel
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- K. Kohl
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- N. Kozlenko
- Petersburg Nuclear Physics 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
- F. Messi
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- R. Messi
- 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
- D. Moricciani
- 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
- V.A. Nikonov
- Rheinische Friedrich-Wilhelms-Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, 53115 Bonn, Germany; Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
- D. Novinskiy
- Petersburg Nuclear Physics 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
- A.V. Sarantsev
- Rheinische Friedrich-Wilhelms-Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, 53115 Bonn, Germany; Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
- 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, Gatchina, Leningrad District, 188300, Russia
- V. Sumachev
- Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
- V. Vegna
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- V. Tarakanov
- Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
- T. Zimmermann
- Rheinische Friedrich-Wilhelms-Universität Bonn, Physikalisches Institut, Nußallee 12, 53115 Bonn, Germany
- Journal volume & issue
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Vol. 820
p. 136559
Abstract
The γp→K+Σ0 differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the K+ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900 MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.
