Journal
PHYSICAL REVIEW C
Volume 87, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.87.035206
Keywords
-
Categories
Funding
- DOE [DE-FG02-87ER40315]
- United States Department of Energy [DE-AC05-84ER40150]
- National Science Foundation
- United Kingdom's Science and Technology Facilities Council
- STFC [ST/G008582/1, ST/J000175/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000175/1, 1096291, ST/G008582/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969201] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205782, 0856010, 969434] Funding Source: National Science Foundation
Ask authors/readers for more resources
The reaction gamma + p -> K+ + Sigma + pi was used to determine the invariant mass distributions or line shapes of the Sigma(+) pi-, Sigma - pi(+), and Sigma(0)pi(0) final states, from threshold at 1328 MeV/c(2) through the mass range of the Lambda(1405) and the Lambda(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95 < W < 2.85 GeV. The three mass distributions differ strongly in the vicinity of the I = 0 Lambda(1405), indicating the presence of substantial I = 1 strength in the reaction. Background contributions to the data from the Sigma(0)(1385) and from K*Sigma production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the N (K) over bar threshold. A best fit to all the data was obtained after including a phenomenological I = 1, J(P) = 1/2(-) amplitude with a centroid at 1394 +/- 20 MeV/c(2) and a second I = 1 amplitude at 1413 +/- 10 MeV/c(2). The centroid of the I = 0 Lambda(1405) strength was found at the Sigma pi threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c(2).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available