#### ${{\mathit \Xi}_{{c}}^{+}}$ MASS

The fit uses the ${{\mathit \Xi}_{{c}}^{+}}$ and ${{\mathit \Xi}_{{c}}^{0}}$ mass and mass-difference measurements.
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
 $\bf{ 2467.71 \pm0.23}$ OUR FIT  Error includes scale factor of 1.3.
 $\bf{ 2467.95 \pm0.19}$ OUR AVERAGE
$2467.97$ $\pm0.14$ $\pm0.17$ 3.8k 1
 2014 Z
LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV
$2468.00$ $\pm0.18$ $\pm0.51$ 5.1k
 2014 B
CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV
$2468.1$ $\pm0.4$ ${}^{+0.2}_{-1.4}$ 4.9k 2
 2005
BELL ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit \Upsilon}{(4S)}}$
$2465.8$ $\pm1.9$ $\pm2.5$ 90
 1998
E687 ${{\mathit \gamma}}$ ${}^{}\mathrm {Be}$, ${{\overline{\mathit E}}}_{\gamma }$= $220$ GeV
$2467.0$ $\pm1.6$ $\pm2.0$ 147
 1996
CLE2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $\approx{}{{\mathit \Upsilon}{(4S)}}$
$2465.1$ $\pm3.6$ $\pm1.9$ 30
 1990 F
ARG ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at ${{\mathit \Upsilon}{(4S)}}$
$2467$ $\pm3$ $\pm4$ 23
 1989
CLEO ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $10.6$ GeV
$2466.5$ $\pm2.7$ $\pm1.2$ 5
 1989 C
ACCM ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Cu}$ 230 GeV
• • We do not use the following data for averages, fits, limits, etc. • •
$2464.4$ $\pm2.0$ $\pm1.4$ 30
 1993 B
E687 See FRABETTI 1998
$2459$ $\pm5$ $\pm30$ 56 3
 1987
SPEC ${{\mathit n}}{}^{}\mathrm {A}$ $\simeq{}$ 600 GeV
$2460$ $\pm25$ 82
 1983
SPEC ${{\mathit \Sigma}^{-}}{}^{}\mathrm {Be}$ 135 GeV
 1 AAIJ 2014Z systematic error includes in quadrature the 0.14 MeV uncertainty from the m(${{\mathit \Lambda}_{{c}}^{+}}$ ) mass value.
 2 The systematic error was (wrongly) given the other way round in LESIAK 2005 ; see the erratum.
 3 Although COTEUS 1987 claims to agree well with BIAGI 1983 on the mass and width, there appears to be a discrepancy between the two experiments. BIAGI 1983 sees a single peak (stated significance about 6 standard deviations) in the ${{\mathit \Lambda}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$ mass spectrum. COTEUS 1987 sees $\mathit two$ peaks in the same spectrum, one at the ${{\mathit \Xi}_{{c}}^{+}}$ mass, the other 75 MeV lower. The latter is attributed to ${{\mathit \Xi}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Sigma}^{0}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$ $\rightarrow$ ( ${{\mathit \Lambda}}{{\mathit \gamma}}$) ${{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}$ , with the ${{\mathit \gamma}}$ unseen. The $\mathit combined$ significance of the double peak is stated to be 5.5 standard deviations. But the absence of any trace of a lower peak in BIAGI 1983 seems to us to throw into question the interpretation of the lower peak of COTEUS 1987 .
References:
 AAIJ 2014Z
PRL 113 032001 Precision Measurement of the Mass and Lifetime of the ${{\mathit \Xi}_{{b}}^{0}}$ Baryon
 AALTONEN 2014B
PR D89 072014 Mass and Lifetime Measurements of Bottom and Charm Baryons in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 LESIAK 2005
PL B605 237 Measurement of Masses and Branching Ratios of ${{\mathit \Xi}_{{c}}^{+}}$ and ${{\mathit \Xi}_{{c}}^{0}}$ Baryons
 Also
PL B617 198 (errat.) Erratum to LESIAK 2005 . Measurement of Masses and Branching Ratios of ${{\mathit \Xi}_{{c}}^{+}}$ and ${{\mathit \Xi}_{{c}}^{0}}$ Baryons
 FRABETTI 1998
PL B427 211 A New Measurement of the Lifetime of the ${{\mathit \Xi}_{{c}}^{+}}$
 EDWARDS 1996
PL B373 261 Observation of New Decay Modes of the Charmed Strange Baryon ${{\mathit \Xi}_{{c}}^{+}}$
 FRABETTI 1993B
PRL 70 1381 Measurement of the Mass and Lifetime of the ${{\mathit \Xi}_{{c}}^{+}}$
 ALBRECHT 1990F
PL B247 121 Measurement of ${{\mathit \Xi}_{{c}}{(2460)}}$ Production in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ Annihilation at 10.5 GeV Centre-of-Mass Energies
 ALAM 1989
PL B226 401 Measurement of the Isospin Mass Splitting between ${{\mathit \Xi}_{{c}}^{+}}$ and ${{\mathit \Xi}_{{c}}^{0}}$
 BARLAG 1989C
PL B233 522 Measurement of the Mass and Lifetime of the Charmed Strange Baryon ${{\mathit \Xi}_{{c}}^{+}}$
 COTEUS 1987
PRL 59 1530 Production of the Charmed Strange Baryon ${{\mathit \Xi}_{{c}}^{+}}$ by Neutrons
 BIAGI 1983
PL 122B 455 Observation of a Narrow State at 2.46 ${\mathrm {GeV/}}\mathit c{}^{2}$ $−$ A Candidate for the Charmed Strange Baryon ${{\mathit A}^{+}}$