Transparency ratio in gamma A -< eta ` A ` and the in-medium eta ` width
Transparency ratio in gamma A -< eta ` A ` and the in-medium eta ` width
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伽玛透明度比 A -< eta`A` 和介质内 eta` 宽度
DOI:
10.1016/j.physletb.2012.03.039
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发表时间:
2012
影响因子:
4.4
通讯作者:
TAPS Collaboration]
中科院分区:
文献类型:
--
作者:
M. Nanova [CBELSA;TAPS Collaboration]
The photoproduction of η′-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500–2200 MeV. The transparency ratio has been deduced and compared to theoretical calculations describing the propagation of η′-mesons in nuclei. The comparison indicates a width of the η′-meson of the order of Γ=15–25 MeV at ρ=ρ0for an average momentum [Formula: see text] , at which the η′-meson is produced in the nuclear rest frame. The inelastic η′N cross section is estimated to be 3–10 mb. Parameterizing the photoproduction cross section of η′-mesons by σ(A)=σ0Aα, a value of α=0.84±0.03 has been deduced.
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DOI:
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发表时间:
2002
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