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${{\mathit \Xi}{(1820)}}$ WIDTH

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B050W

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT $\bf{ 24 {}^{+15}_{-10}}$ OUR ESTIMATE $\bf{ 24 \pm5}$ OUR AVERAGE  Error includes scale factor of 1.3.  See the ideogram below. $17.0$ $\pm15.0$ $\pm7.9$ 288 ABLIKIM 2020 C BES3 - ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Xi}{(1820)}^{-}}{{\overline{\mathit \Xi}}^{+}}$ $24.6$ $\pm5.3$ 280 1 BIAGI 1987 SPEC 0 ${{\mathit \Xi}^{-}}$ ${}^{}\mathrm {Be}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\mathit K}^{-}}$) X $12$ $\pm14$ $\pm1.7$ 54 BIAGI 1987 C SPEC 0 ${{\mathit \Xi}^{-}}$ ${}^{}\mathrm {Be}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$) X $72$ $\pm20$ 300 BIAGI 1981 SPEC - SPS hyperon beam $21$ $\pm7$ 130 GAY 1976 C HBC - ${{\mathit K}^{-}}{{\mathit p}}$ 4.2 ${\mathrm {GeV/}}\mathit c$ • • We do not use the following data for averages, fits, limits, etc. • • $23$ $\pm13$ ADAMOVICH 1999 B WA89 ${{\mathit \Sigma}^{-}}$ nucleus, 345 GeV $99$ $\pm57$ 74 BRIEFEL 1977 HBC 0 ${{\mathit K}^{-}}{{\mathit p}}$ 2.87 ${\mathrm {GeV/}}\mathit c$ $52$ $\pm34$ 68 BRIEFEL 1977 HBC -0 ${{\mathit \Xi}{(1530)}}{{\mathit \pi}}$ $72$ $\pm17$ 39 BRIEFEL 1977 HBC - ${{\mathit \Sigma}^{-}}{{\overline{\mathit K}}^{0}}$ $44$ $\pm11$ 44 BRIEFEL 1977 HBC 0 ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$ $26$ $\pm11$ 57 BRIEFEL 1977 HBC - ${{\mathit \Lambda}}{{\mathit K}^{-}}$ $85$ $\pm58$ DIBIANCA 1975 DBC -0 ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit \Xi}^{*}}{{\mathit \pi}}$ $51$ $\pm13$ 2 BADIER 1972 HBC -0 Lower mass $58$ $\pm13$ 2 BADIER 1972 HBC -0 Higher mass $103$ ${}^{+38}_{-24}$ 3 CRENNELL 1970 B DBC -0 3.6, 3.9 ${\mathrm {GeV/}}\mathit c$ $48$ ${}^{+36}_{-19}$ 4 CRENNELL 1970 B DBC -0 3.6, 3.9 ${\mathrm {GeV/}}\mathit c$ $55$ ${}^{+40}_{-20}$ ALITTI 1969 HBC - ${{\mathit \Lambda}}$, ${{\mathit \Sigma}}{{\overline{\mathit K}}}$ $12$ $\pm4$ BADIER 1965 HBC 0 ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$ $30$ $\pm7$ SMITH 1965 B HBC -0 ${{\mathit \Lambda}}{{\overline{\mathit K}}}$ $\text{<80}$ HALSTEINSLID 1963 FBC -0 ${{\mathit K}^{-}}$ freon 3.5 ${\mathrm {GeV/}}\mathit c$ 1  BIAGI 1987 also sees weak signals in the in the ${{\mathit \Xi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ channel at $1782.6$ $\pm1.4$ MeV ($\Gamma $ = $6.0$ $\pm1.5$ MeV) and $1831.9$ $\pm2.8$ MeV ($\Gamma $ = $9.6$ $\pm9.9$ MeV). 2  BADIER 1972 adds all channels and divides the peak into lower and higher mass regions. The data can also be fitted with a single Breit-Wigner of mass 1800 MeV and width 150 MeV. 3  From a fit to inclusive ${{\mathit \Xi}}{{\mathit \pi}}$, ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$, and ${{\mathit \Lambda}}{{\mathit K}^{-}}$ spectra. 4  From a fit to inclusive ${{\mathit \Xi}}{{\mathit \pi}}$ and ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$ spectra only.

${{\mathit \Xi}{(1820)}}$ width (MeV)

References