Elsevier

Nuclear Physics B

Volume 158, Issues 2–3, 15–22 October 1979, Pages 265-279
Nuclear Physics B

Partial-wave analysis in the Q region of (ππ) systems produced in Kp reactions at 4.2 GeV/c

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Abstract

A partial-wave analysis and an isospin analysis are presented of the (Kππ) systems produced in the reactions KpKππ+ and KpK0ππp u sing the high-statistics bubble-chamber data at 4.2 GeV/c. The energy dependence of JP = 1+ waves is investigated in a comparison with results at higher energy. The dominant 1+0+ (Kπ) with its maximum in the Q2 (1.4 GeV) region is an almost pure I = 12 state. The energy dependence of 1+0+ (Kπ) at low masses is consistent with pomeron exchange while at higher masses (including the Q2 region) other natural exchanges are involved. The 11+ (Kϱ) has its maximum at about 1.3 GeV. The relative phase between these two 1+ states is consistent with Q1−Q2 contribution to the 1+ state. Properties of the Q resonances are obtained in a fit of a two-resonance model to the 1+ date. There is no clear evidence for the 0 resonance seen at SLAC.

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Cited by (7)

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3)

The investigation is supported by the joint research program of FOM and ZWO.

1)

At present on leave of absence at the Institut für Hochenergiephysik der ÖsterreichischenAkademie der Wissenschaften, Vienna, Austria.

2)

Now at the Institute of Physics, Silesian University, Katowice, Poland.

4)

Now at Rutherford Laboratory, Chilton, Didcot, Oxon, UK.

5)

Now at Imperial College, London, UK.

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