Elsevier

Nuclear Physics B

Volume 32, Issue 2, 15 September 1971, Pages 381-414
Nuclear Physics B

Kπ scattering phase shifts determined from the reactions K+p→K+πΔ++ and K+p→KoπoΔ++

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Abstract

We studied the Kπ scattering from threshold to mKπ = 1200 MeV using the Chew-Low extrapolation method in the reactions K+pKoπoΔ++. In addition to an analysis using only the data at 5.43 GeV/c incident momentum, we also present the results using the world data compiled from experiments with momenta from 3.0 to 12.7 GeV/c.

The extrapolated cross section for the elastic K+π→K+π scattering exceeds the p-wave isospin-12 unitary limit in the K (890) region. The phase shift δ11 (notation δl2I) shows the expected Breit-Wigner behavior which suggests that δ13⋍0 in the mass region studied. Solutions for the s-wave phase shifts δo1 and δo3 are obtained from the extrapolated differential cross sections. We obtain a unique set of solutions for δo1 and δo3 by requiring the calculated cross sections to agree with those extrapolated from K+π elastic scattering and with those for Kπ scattering obtained in other experiments. We find δo1 increasing slowly from 0° at threshold and approaching 80° at m⋍1150 MeV with no evidence of passing through 90° in the mass range studied. The phase shift δo3 decreases slowly from 0° at threshold to ⋍ − 30° at m ⋍ 1200 MeV.

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Cited by (0)

Supported in part by the National Science Foundation and the US Atomic Energy Commission Computation Center.

Present address: University of Indiana, Bloomington, Indiana.

‡‡

Present address: Raytheon Corporation, Newport, R.I.

#

Present address: University of Massachusetts, Amherst, Massachusetts.

##

Present address: American Institute of Physics, New York, N.Y. 10017.

Present address: Rutherford High Energy Laboratory, Chilton, Didcot, Berkshire, England.

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