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${{\mathit \Sigma}{(1690)}}$ WIDTH (PRODUCTION EXPERIMENTS)

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B058W

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT $240$ $\pm60$ 70 1 GODDARD 1979 HBC + ${{\mathit \pi}^{+}}{{\mathit p}}$ 10.3 ${\mathrm {GeV/}}\mathit c$ $130$ ${}^{+100}_{-60}$ 40 2 GODDARD 1979 HBC + ${{\mathit \pi}^{+}}{{\mathit p}}$ 10.3 ${\mathrm {GeV/}}\mathit c$ $142$ $\pm40$ 15 ADERHOLZ 1969 HBC + ${{\mathit \pi}^{+}}{{\mathit p}}$ 8 ${\mathrm {GeV/}}\mathit c$ $25$ $\pm10$ 46 BLUMENFELD 1969 HBC + ${{\mathit K}_L^0}$ ${{\mathit p}}$ $130$ $\pm25$ MOTT 1969 HBC + ${{\mathit K}^{-}}{{\mathit p}}$ 5.5 ${\mathrm {GeV/}}\mathit c$ $105$ $\pm35$ 60 3 PRIMER 1968 HBC + ${{\mathit K}^{-}}{{\mathit p}}$ 4.6$-$5 ${\mathrm {GeV/}}\mathit c$ $62$ $\pm14$ 4 SIMS 1968 HBC - ${{\mathit K}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}{{\mathit \pi}}$ $100$ $\pm35$ 30 COLLEY 1967 HBC + ${{\mathit K}^{-}}{{\mathit p}}$ 6 ${\mathrm {GeV/}}\mathit c$ 1  From ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$) ${{\mathit K}^{+}}$. $\mathit J$ $>{}^{}1/2{}^{}$ is not required by the data. 2  From ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$) ( ${{\mathit K}}{{\mathit \pi}}$) ${}^{+}$. $\mathit J$ $>{}^{}1/2{}^{}$ is indicated, but large background precludes a definite conclusion. 3  See the ${{\mathit \Sigma}{(1670)}}$ Listings. AGUILAR-BENITEZ 1970B with three times the data of PRIMER 1968 find no evidence for the ${{\mathit \Sigma}{(1690)}}$. 4  This analysis, which is difficult and requires several assumptions and shows no unambiguous ${{\mathit \Sigma}{(1690)}}$ signal, suggests $\mathit J{}^{P} = 5/2{}^{+}$. Such a state would lead all previously known ${{\mathit Y}^{*}}$ trajectories.

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