# (${\boldsymbol m}_{{{\boldsymbol \Lambda}}}–{\boldsymbol m}_{{{\overline{\boldsymbol \Lambda}}}}$) $/$ ${\boldsymbol m}_{{{\boldsymbol \Lambda}}}$ INSPIRE search

A test of $\mathit CPT$ invariance.
VALUE ($10^{-5}$) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -0.1 \pm1.1}$ OUR AVERAGE  Error includes scale factor of 1.6.
$+1.3$ $\pm1.2$ 31k 1
 1996
NA32 ${{\mathit \pi}^{-}}{}^{}\mathrm {Cu}$, 230 GeV
$-1.08$ $\pm0.90$
 1994
SPEC ${{\mathit p}}{{\mathit p}}$ $27.5$ ${\mathrm {GeV/}}\mathit c$
$4.5$ $\pm5.4$
 1966
HBC 6.9 ${\mathrm {GeV/}}\mathit c$ ${{\overline{\mathit p}}}{{\mathit p}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$-26$ $\pm13$
 1967
HBC 2.4 ${\mathrm {GeV/}}\mathit c$ ${{\overline{\mathit p}}}{{\mathit p}}$
1  RYBICKI 1996 is an analysis of old ACCMOR (NA32) data.
Conservation Laws:
 $\mathit CPT$ INVARIANCE
References:
 RYBICKI 1996
APP B27 2155 Measurement of ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$ Mass Difference
 HARTOUNI 1994
PRL 72 1322 Precise Measurement of the ${{\mathit \Lambda}^{0}}$ and ${{\overline{\mathit \Lambda}}^{0}}$ Masses and a Test of $\mathit CPT$ Invariance
PL 25B 152 Reactions ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \Lambda}}$ at 2.5 ${\mathrm {GeV/}}\mathit c$
PR 152 1171 Hyperon and Antihyperon Production in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at 7 ${\mathrm {GeV/}}\mathit c$