First measurement of coherent φ -meson photoproduction from He 4 near threshold

LEPS Collaboration

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The differential cross sections and decay angular distributions for coherent φ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.685-2.385GeV. Thanks to the target with spin-parity JP=0+, unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (>94%) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (θ=0â) for the γp→φp reaction near threshold, the energy dependence of the forward cross section (θ=0â) for the γHe4→φHe4 reaction is analyzed. The comparison to γp→φp data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the γp→φp reaction near threshold.

Original languageEnglish
Article number035208
JournalPhysical Review C
Volume97
Issue number3
DOIs
Publication statusPublished - 2018 Mar 27

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photoproduction
parity
mesons
thresholds
cross sections
helium isotopes
photons
decay
angular distribution
asymmetry
interference
energy
augmentation
polarization

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

First measurement of coherent φ -meson photoproduction from He 4 near threshold. / LEPS Collaboration.

In: Physical Review C, Vol. 97, No. 3, 035208, 27.03.2018.

Research output: Contribution to journalArticle

@article{2e89a2cbac8d4d639cf0a6393b92f2e1,
title = "First measurement of coherent φ -meson photoproduction from He 4 near threshold",
abstract = "The differential cross sections and decay angular distributions for coherent φ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.685-2.385GeV. Thanks to the target with spin-parity JP=0+, unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (>94{\%}) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (θ=0{\^a}) for the γp→φp reaction near threshold, the energy dependence of the forward cross section (θ=0{\^a}) for the γHe4→φHe4 reaction is analyzed. The comparison to γp→φp data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the γp→φp reaction near threshold.",
author = "{LEPS Collaboration} and T. Hiraiwa and M. Yosoi and M. Niiyama and Y. Morino and Y. Nakatsugawa and M. Sumihama and Ahn, {D. S.} and Ahn, {Jung Keun} and Chang, {W. C.} and Chen, {J. Y.} and S. Dat{\'e} and H. Fujimura and S. Fukui and K. Hicks and T. Hotta and Hwang, {S. H.} and T. Ishikawa and Y. Kato and H. Kawai and H. Kohri and Y. Kon and Lin, {P. J.} and Y. Maeda and M. Miyabe and K. Mizutani and N. Muramatsu and T. Nakano and Y. Nozawa and Y. Ohashi and T. Ohta and M. Oka and C. Rangacharyulu and Ryu, {S. Y.} and T. Saito and T. Sawada and H. Shimizu and Strokovsky, {E. A.} and Y. Sugaya and K. Suzuki and Tokiyasu, {A. O.} and T. Tomioka and T. Tsunemi and M. Uchida and T. Yorita",
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T1 - First measurement of coherent φ -meson photoproduction from He 4 near threshold

AU - LEPS Collaboration

AU - Hiraiwa, T.

AU - Yosoi, M.

AU - Niiyama, M.

AU - Morino, Y.

AU - Nakatsugawa, Y.

AU - Sumihama, M.

AU - Ahn, D. S.

AU - Ahn, Jung Keun

AU - Chang, W. C.

AU - Chen, J. Y.

AU - Daté, S.

AU - Fujimura, H.

AU - Fukui, S.

AU - Hicks, K.

AU - Hotta, T.

AU - Hwang, S. H.

AU - Ishikawa, T.

AU - Kato, Y.

AU - Kawai, H.

AU - Kohri, H.

AU - Kon, Y.

AU - Lin, P. J.

AU - Maeda, Y.

AU - Miyabe, M.

AU - Mizutani, K.

AU - Muramatsu, N.

AU - Nakano, T.

AU - Nozawa, Y.

AU - Ohashi, Y.

AU - Ohta, T.

AU - Oka, M.

AU - Rangacharyulu, C.

AU - Ryu, S. Y.

AU - Saito, T.

AU - Sawada, T.

AU - Shimizu, H.

AU - Strokovsky, E. A.

AU - Sugaya, Y.

AU - Suzuki, K.

AU - Tokiyasu, A. O.

AU - Tomioka, T.

AU - Tsunemi, T.

AU - Uchida, M.

AU - Yorita, T.

PY - 2018/3/27

Y1 - 2018/3/27

N2 - The differential cross sections and decay angular distributions for coherent φ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.685-2.385GeV. Thanks to the target with spin-parity JP=0+, unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (>94%) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (θ=0â) for the γp→φp reaction near threshold, the energy dependence of the forward cross section (θ=0â) for the γHe4→φHe4 reaction is analyzed. The comparison to γp→φp data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the γp→φp reaction near threshold.

AB - The differential cross sections and decay angular distributions for coherent φ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.685-2.385GeV. Thanks to the target with spin-parity JP=0+, unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (>94%) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (θ=0â) for the γp→φp reaction near threshold, the energy dependence of the forward cross section (θ=0â) for the γHe4→φHe4 reaction is analyzed. The comparison to γp→φp data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the γp→φp reaction near threshold.

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U2 - 10.1103/PhysRevC.97.035208

DO - 10.1103/PhysRevC.97.035208

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JO - Physical Review C

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SN - 2469-9985

IS - 3

M1 - 035208

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