# ${{\boldsymbol \Sigma}{(1840)}}$ MASS INSPIRE search

VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ \approx1840}$ OUR ESTIMATE
$1798$ or $1802$ 1
 1977
DPWA ${{\overline{\mathit K}}}{{\mathit N}}$ multichannel
$1720$ $\pm30$ 2
 1975
IPWA ${{\overline{\mathit K}}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$
$1925$ $\pm200$
 1975
DPWA ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$
$1840$ $\pm10$
 1972
IPWA ${{\overline{\mathit K}}}{{\mathit N}}$ multichannel
1  The two MARTIN 1977 values are from a T-matrix pole and from a Breit-Wigner fit.
2  From solution 1 of BAILLON 1975 ; not present in solution 2.
References:
 MARTIN 1977
NP B127 349 ${{\overline{\mathit K}}}{{\mathit N}}$ Interactions in the Resonance Region. 3. Resonance Spectra
 BAILLON 1975
NP B94 39 Energy Independent Partial Wave Analysis of ${{\overline{\mathit K}}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$ between 1540 and 2150 MeV
 VANHORN 1975
NP B87 145 Energy Dependent Partial Wave Analysis of ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$ between 1540 and 2215 MeV
 LANGBEIN 1972
NP B47 477 An Energy Independent Coupled Channel Phase Shift Analysis for the ${{\overline{\mathit K}}}{{\mathit N}}$ System