pdgLive Home   >   Baryon Summary Table   >   ${{\mathit \Xi}_{{{c}}}^{+}}$   >   ${{\mathit \Xi}_{{{c}}}^{+}}$ MASS

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

INSPIRE   PDGID:

S045M

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 AAIJ 2014 Z LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV $2468.00$ $\pm0.18$ $\pm0.51$ 5.1k AALTONEN 2014 B CDF ${{\mathit p}}{{\overline{\mathit p}}}$ at 1.96 TeV $2468.1$ $\pm0.4$ ${}^{+0.2}_{-1.4}$ 4.9k 2 LESIAK 2005 BELL ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \Upsilon}{(4S)}}$ $2465.8$ $\pm1.9$ $\pm2.5$ 90 FRABETTI 1998 E687 ${{\mathit \gamma}}{}^{}\mathrm {Be}$, ${{\overline{\mathit E}}}_{\gamma }$= $220$ GeV $2467.0$ $\pm1.6$ $\pm2.0$ 147 EDWARDS 1996 CLE2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $\approx{}{{\mathit \Upsilon}{(4S)}}$ $2465.1$ $\pm3.6$ $\pm1.9$ 30 ALBRECHT 1990 F ARG ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at ${{\mathit \Upsilon}{(4S)}}$ $2467$ $\pm3$ $\pm4$ 23 ALAM 1989 CLEO ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $10.6$ GeV $2466.5$ $\pm2.7$ $\pm1.2$ 5 BARLAG 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 FRABETTI 1993 B E687 See FRABETTI 1998 $2459$ $\pm5$ $\pm30$ 56 3 COTEUS 1987 SPEC ${{\mathit n}}{}^{}\mathrm {A}$ $\simeq{}$ 600 GeV $2460$ $\pm25$ 82 BIAGI 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