02 02 6 v 1 1 4 Fe b 20 04 Upper limit on the decay Σ ( 1385 ) − → Σ − γ , and cross section for γ Σ − → Λ π −
نویسندگان
چکیده
Coherent Λπ− production on Pb of 600GeV Σ− hyperons has been studied with the SELEX facility at Fermilab. Using the Primakoff formalism, we set a 90% CL upper limit on the radiative decay width Γ[Σ(1385)− → Σ−γ] < 9.5 keV, and estimate the cross section for γΣ− → Λπ− at √s ≈ 1.385GeV to be 56± 16μb.
منابع مشابه
2 00 4 Upper limit on the decay Σ ( 1385 ) − → Σ − γ , and cross section for γ Σ − → Λ π −
Coherent Λπ− production on Pb of 600GeV Σ− hyperons has been studied with the SELEX facility at Fermilab. Using the Primakoff formalism, we set a 90% CL upper limit on the radiative decay width Γ[Σ(1385)− → Σ−γ] < 9.5 keV, and estimate the cross section for γΣ− → Λπ− at √s ≈ 1.385GeV to be 56± 16μb.
متن کاملDifferential photoproduction cross sections of the Σ0(1385), Îł(1405), and Îł(1520)
We report the exclusive photoproduction cross sections for the Σ 0 (1385), Λ(1405), and Λ(1520) in the reactions γ + p → K + + Y * using the CLAS detector for energies from near the respective production thresholds up to a center-of-mass energy W of 2.85 GeV. The differential cross sections are integrated to give the total exclusive cross sections for each hyperon. Comparisons are made to curre...
متن کاملMeasurement of (1385) in Al+Al collisions at 1.9 A GeV
The FOPI Collaboration performed a high statistic experiment to study the strangeness production in Al+Al collisions at 1.9A GeV. The high statistics data (300 million of events) allow the reconstruction of the Σ(1385) hyperon resonance at SIS energies for the first time. This measurement corresponds to sub-threshold production since the threshold beam energy for Σ∗ production in the elementary...
متن کاملScaling and asymptotic behavior of the γ ∗ p total cross section at low x ⋆
The scaling in σ γ * p cross sections (for Q 2 /W 2 << 1) in terms of the scaling variable η = (Q 2 + m 2 0)/Λ 2 (W 2) is interpreted in the generalized vector dominance/color-dipole picture (GVD/CDP). The quantity Λ 2 (W 2) is identified as the average gluon transverse momentum absorbed by the q ¯ q state, < l 2 >= (1/6)Λ 2 (W 2). At any Q 2 , for W 2 → ∞, the cross sections for virtual and re...
متن کاملBI-TP 2001/29 The γ ∗ p total cross section at low x ∗
The scaling in σ γ * p (W 2 , Q 2) cross sections (for Q 2 /W 2 << 1) in terms of the scaling variable η = (Q 2 + m 2 0)/Λ 2 (W 2) is interpreted in the generalized vector dominance/color-dipole picture (GVD/CDP). The quantity Λ 2 (W 2) is identified as the average gluon transverse momentum absorbed by the q ¯ q state, < l 2 ⊥ >= (1/6)Λ 2 (W 2). At any Q 2 , for W 2 → ∞, the cross sections for ...
متن کامل