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

INSPIRE   PDGID:

B050M

We only average the measurements that appear to us to be most significant and best determined.

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT $\bf{ 1823 \pm5}$ OUR ESTIMATE $\bf{ 1823.5 \pm1.4}$ OUR AVERAGE $1825.5$ $\pm4.7$ $\pm4.7$ 288 ABLIKIM 2020 C BES3 - ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Xi}{(1820)}^{-}}{{\overline{\mathit \Xi}}^{+}}$ $1819.4$ $\pm3.1$ $\pm2.0$ 280 1 BIAGI 1987 SPEC 0 ${{\mathit \Xi}^{-}}$ ${}^{}\mathrm {Be}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\mathit K}^{-}}$) X $1826$ $\pm3$ $\pm1$ 54 BIAGI 1987 C SPEC 0 ${{\mathit \Xi}^{-}}$ ${}^{}\mathrm {Be}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$) X $1822$ $\pm6$ JENKINS 1983 MPS - ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}$ (MM) $1830$ $\pm6$ 300 BIAGI 1981 SPEC - SPS hyperon beam $1823$ $\pm2$ 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. • • $1817$ $\pm3$ ADAMOVICH 1999 B WA89 ${{\mathit \Sigma}^{-}}$ nucleus, 345 GeV $1797$ $\pm19$ 74 BRIEFEL 1977 HBC 0 ${{\mathit K}^{-}}{{\mathit p}}$ 2.87 ${\mathrm {GeV/}}\mathit c$ $1829$ $\pm9$ 68 BRIEFEL 1977 HBC -0 ${{\mathit \Xi}{(1530)}}{{\mathit \pi}}$ $1860$ $\pm14$ 39 BRIEFEL 1977 HBC - ${{\mathit \Sigma}^{-}}{{\overline{\mathit K}}^{0}}$ $1870$ $\pm9$ 44 BRIEFEL 1977 HBC 0 ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$ $1813$ $\pm4$ 57 BRIEFEL 1977 HBC - ${{\mathit \Lambda}}{{\mathit K}^{-}}$ $1807$ $\pm27$ DIBIANCA 1975 DBC -0 ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit \Xi}^{*}}{{\mathit \pi}}$ $1762$ $\pm8$ 28 2 BADIER 1972 HBC -0 ${{\mathit \Xi}}{{\mathit \pi}}$, ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit Y}}{{\mathit K}}$ $1838$ $\pm5$ 38 2 BADIER 1972 HBC -0 ${{\mathit \Xi}}{{\mathit \pi}}$, ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit Y}}{{\mathit K}}$ $1830$ $\pm10$ 25 3 CRENNELL 1970 B DBC -0 3.6, 3.9 ${\mathrm {GeV/}}\mathit c$ $1826$ $\pm12$ 4 CRENNELL 1970 B DBC -0 3.6, 3.9 ${\mathrm {GeV/}}\mathit c$ $1830$ $\pm10$ 40 ALITTI 1969 HBC - ${{\mathit \Lambda}}$, ${{\mathit \Sigma}}{{\overline{\mathit K}}}$ $1814$ $\pm4$ 30 BADIER 1965 HBC 0 ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$ $1817$ $\pm7$ 29 SMITH 1965 C HBC -0 ${{\mathit \Lambda}}{{\overline{\mathit K}}^{0}}$, ${{\mathit \Lambda}}{{\mathit K}^{-}}$ $1770$ 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.

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