Backward production of a spin-parity 1<SUP>+</SUP> K<SUB>ϱ</SUB> resonance at 1.28 GeV
- Gavillet, Ph.
- Diaz, J.
- Dionisi, C.
- Gurtu, A.
- Hemingway, R. J.
- Losty, M. J.
- Marin, J. C.
- Mazzucato, M.
- Montanet, L.
- Pagiola, E.
- Blokzijl, R.
- Jongejans, B.
- Massaro, G. G. G.
- Voorthuis, H.
- Engelen, J. J.
- Kittel, W.
- Vergeest, J. S.
- van de Walle, R. T.
- Foster, B.
- Grossmann, P.
- McDowell, W. L.
DOIAbstract
A (K<SUB>ππ </SUB><SUP>+ </SUP> mass enhancement is observed in the reactions K<SUP>- </SUP> p → Ξ −K<SUP>0+ </SUP> π<SUP>+ </SUP> π<SUP>0- </SUP> when events with a small (K<SUP>- </SUP> → Ξ<SUP>- </SUP>) four momentum transfer squared are selected. The signal is also visible in the reaction K<SUP>-</SUP> p → Ξ<SUP>- </SUP> π<SUP>+ </SUP> + neutrals. The enhancement, centered at 1.28 GeV, is seen to decay preferentially into Kϱ with spin-parity JP = 1+. The cross section for K<SUP>- </SUP> p→ Ξ−C<SUP>+ </SUP> (1.28) with C<SUP>+ </SUP> → K<SUB> ϱ </SUB> at 4.15 GeV/c incident K<SUP>- </SUP> momentum is (6.2 ± 0.6) μb
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