The photoproduction of ‰ 0 -mesons and ¢-baryons at photon energies up to 2.6 GeV has been studied with the SAPHIR detector at the electron stretcher ELSA. Total and difierential cross-sections were obtained. The decay angular distributions of ‰ 0 -mesons show that s-channel helicity conservation, which is valid at high photon energies, is broken near threshold. The energy dependencies of the decay angular distributions in the helicity system as well as in the Gottfried-Jackson system hint at small s- or u-channel resonance contributions. For the reactions ∞p ! ¢ ++ … i and ∞p ! ¢ 0 … + new data on cross-sections are presented. PACS. 13.60.Le Meson production { 14.40.Cs Other mesons with S = C = 0, mass < 2.5 GeV

Helicity

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Measurement of g p" K 0 S q at photon energies up to 1.55 GeV 1

S. Goers J. Barth C. Bennhold M. Bockhorst Wolfgang Braun

The reaction g p K 0 S q has been measured with the SAPHIR detector at the electron stretcher ring ELSA. The total cross section rises up to a peak value of 1.1 mb at a photon energy of 1.4 GeV. The differential cross sections dsrdV are consistent with being flat throughout the measured energy range. The first measurement of the S q polarization in photon induced reactions was obtained. q 1999 Published by Elsevier Science B.V. All rights reserved.

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Measurement of the reaction $\gamma p \rightarrow K^ + \Sigma^{\pm}\pi^{\mp}$ at photon energies up to 2.6 GeV

arXiv (Cornell University) (2010)

I. Schulday J. Hannappel N. Jöpen F. J. Klein E. Klempt

The reactions $\gamma p \rightarrow K^{+}\Sigma^{\pm}\pi^{\mp}$ were studied with the SAPHIR detector using a tagged photon beam at the electron stretcher facility ELSA in Bonn. The decays $\Sigma^{-} \rightarrow n\pi^{-}$ and $\Sigma^{+} \rightarrow n\pi^{+}, p\pi^0$ were fully reconstructed. Reaction cross sections were measured as a function of the photon energy from threshold up to $2.6\,$GeV with considerably improved statistics compared to a previous bubble chamber measurement. The cross sections rise monotonously with increasing photon energy. The two-particle mass distributions of $\Sigma^{\pm}\pi^{\mp}$ and $K^+\pi^-$ show substantial production of resonant states.

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Measurement of γp→K+Λ and γp→K+Σ0 at photon energies up to 2 GeV

Physics Letters B (1998)

M.Q. Tran J. Barth C. Bennhold M. Bockhorst Wolfgang Braun

Scattering cross-section

10.1016/s0370-2693(98)01393-8

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Low-energy photoproduction of Φ-mesons

The European Physical Journal A (2003)

J. Barth Wolfgang Braun J. Ernst K.-H. Glander J. Hannappel

10.1140/epja/i2002-10154-1

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Study of the reaction γp → K+Λ(1520) at photon energies up to 2.65 GeV

The European Physical Journal A (2011)

F. W. Wieland J. Barth K.-H. Glander J. Hannappel N. Jöpen

Helicity

Flattening

Photon energy

Momentum transfer

10.1140/epja/i2011-11047-x

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Citations (13)

Measurement of the reaction $γp \rightarrow K^ + Σ^{\pm}π^{\mp}$ at photon energies up to 2.6 GeV

arXiv (Cornell University) (2010)

I. Schulday R. Lawall Johannes V. Barth K.-H. Glander S. Goers

The reactions $γp \rightarrow K^{+}Σ^{\pm}π^{\mp}$ were studied with the SAPHIR detector using a tagged photon beam at the electron stretcher facility ELSA in Bonn. The decays $Σ^{-} \rightarrow nπ^{-}$ and $Σ^{+} \rightarrow nπ^{+}, pπ^0$ were fully reconstructed. Reaction cross sections were measured as a function of the photon energy from threshold up to $2.6\,$GeV with considerably improved statistics compared to a previous bubble chamber measurement. The cross sections rise monotonously with increasing photon energy. The two-particle mass distributions of $Σ^{\pm}π^{\mp}$ and $K^+π^-$ show substantial production of resonant states.

10.48550/arxiv.1011.0823

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