Interference Effect between φ and Λ (1520) Production Channels in the γp →k+K-p Reaction near Threshold

(LEPS Collaboration)

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The φ-Λ(1520) interference effect in the γp→K+K-p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between φ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the s=2.1 GeV bump structure in forward differential cross sections for φ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.

Original languageEnglish
Article number232001
JournalPhysical Review Letters
Volume116
Issue number23
DOIs
Publication statusPublished - 2016 Jun 7

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interference
thresholds
strangeness
photoproduction
kinematics
protons
cross sections
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Interference Effect between φ and Λ (1520) Production Channels in the γp →k+K-p Reaction near Threshold. / (LEPS Collaboration).

In: Physical Review Letters, Vol. 116, No. 23, 232001, 07.06.2016.

Research output: Contribution to journalArticle

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title = "Interference Effect between φ and Λ (1520) Production Channels in the γp →k+K-p Reaction near Threshold",
abstract = "The φ-Λ(1520) interference effect in the γp→K+K-p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between φ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the s=2.1 GeV bump structure in forward differential cross sections for φ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.",
author = "{(LEPS Collaboration)} and Ryu, {S. Y.} and Ahn, {Jung Keun} and T. Nakano and Ahn, {D. S.} and S. Ajimura and H. Akimune and Y. Asano and Chang, {W. C.} and Chen, {J. Y.} and S. Dat{\'e} and H. Ejiri and H. Fujimura and M. Fujiwara and S. Fukui and S. Hasegawa and K. Hicks and K. Horie and T. Hotta and Hwang, {S. H.} and K. Imai and T. Ishikawa and T. Iwata and Y. Kato and H. Kawai and K. Kino and H. Kohri and Y. Kon and N. Kumagai and Lin, {P. J.} and Y. Maeda and S. Makino and T. Matsuda and N. Matsuoka and T. Mibe and M. Miyabe and M. Miyachi and Y. Morino and N. Muramatsu and R. Murayama and Y. Nakatsugawa and Nam, {S. I.} and M. Niiyama and M. Nomachi and Y. Ohashi and H. Ohkuma and T. Ohta and T. Ooba and Oshuev, {D. S.} and Parker, {J. D.} and C. Rangacharyulu",
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T1 - Interference Effect between φ and Λ (1520) Production Channels in the γp →k+K-p Reaction near Threshold

AU - (LEPS Collaboration)

AU - Ryu, S. Y.

AU - Ahn, Jung Keun

AU - Nakano, T.

AU - Ahn, D. S.

AU - Ajimura, S.

AU - Akimune, H.

AU - Asano, Y.

AU - Chang, W. C.

AU - Chen, J. Y.

AU - Daté, S.

AU - Ejiri, H.

AU - Fujimura, H.

AU - Fujiwara, M.

AU - Fukui, S.

AU - Hasegawa, S.

AU - Hicks, K.

AU - Horie, K.

AU - Hotta, T.

AU - Hwang, S. H.

AU - Imai, K.

AU - Ishikawa, T.

AU - Iwata, T.

AU - Kato, Y.

AU - Kawai, H.

AU - Kino, K.

AU - Kohri, H.

AU - Kon, Y.

AU - Kumagai, N.

AU - Lin, P. J.

AU - Maeda, Y.

AU - Makino, S.

AU - Matsuda, T.

AU - Matsuoka, N.

AU - Mibe, T.

AU - Miyabe, M.

AU - Miyachi, M.

AU - Morino, Y.

AU - Muramatsu, N.

AU - Murayama, R.

AU - Nakatsugawa, Y.

AU - Nam, S. I.

AU - Niiyama, M.

AU - Nomachi, M.

AU - Ohashi, Y.

AU - Ohkuma, H.

AU - Ohta, T.

AU - Ooba, T.

AU - Oshuev, D. S.

AU - Parker, J. D.

AU - Rangacharyulu, C.

PY - 2016/6/7

Y1 - 2016/6/7

N2 - The φ-Λ(1520) interference effect in the γp→K+K-p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between φ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the s=2.1 GeV bump structure in forward differential cross sections for φ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.

AB - The φ-Λ(1520) interference effect in the γp→K+K-p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between φ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K+K- pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the s=2.1 GeV bump structure in forward differential cross sections for φ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.

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U2 - 10.1103/PhysRevLett.116.232001

DO - 10.1103/PhysRevLett.116.232001

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