#### ${{\overline{\boldsymbol \Xi}}^{+}}$ MASS

The fit uses the ${{\mathit \Xi}^{-}}$, ${{\overline{\mathit \Xi}}^{+}}$, and ${{\mathit \Xi}^{0}}$ masses and the ${{\mathit \Xi}^{-}}−{{\overline{\mathit \Xi}}^{+}}$ mass difference. It assumes that the ${{\mathit \Xi}^{-}}$ and ${{\overline{\mathit \Xi}}^{+}}$ masses are the same.
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
 $\bf{ 1321.71 \pm0.07}$ OUR FIT
$1321.73$ $\pm0.08$ $\pm0.05$ $2256$ $\pm63$
 2006 E
DLPH from ${{\mathit Z}}$ decays
• • We do not use the following data for averages, fits, limits, etc. • •
$1321.6$ $\pm0.8$ 35
 1972
HBC 10 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{+}}{{\mathit p}}$
$1321.2$ $\pm0.4$ 34
 1970
HBC
$1320.69$ $\pm0.93$ 5
 1966
HBC 6.9 ${\mathrm {GeV/}}\mathit c$ ${{\overline{\mathit p}}}{{\mathit p}}$
References:
 ABDALLAH 2006E
PL B639 179 Masses, Lifetimes and Production Rates of ${{\mathit \Xi}^{-}}$ and ${{\overline{\mathit \Xi}}^{+}}$ at LEP 1
 VOTRUBA 1972
NP B45 77 Multiple Strange Particle Production by 10 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{+}}$ Mesons in Hydrogen
 STONE 1970
PL 32B 515 Production of ${{\mathit \Xi}^{-}}$ and ${{\overline{\mathit \Xi}}^{+}}$ Particles in ${{\mathit K}^{+}}{{\mathit p}}$ Collisions at 12.7 ${\mathrm {GeV/}}\mathit c$
 CHIEN 1966
PR 152 1171 Hyperon and Antihyperon Production in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at 7 ${\mathrm {GeV/}}\mathit c$