${{\mathit \chi}_{{{c1}}}{(3872)}}$ T-MATRIX POLE $\sqrt {\mathit s }$

INSPIRE   JSON  (beta) PDGID:
M176PP
Note that $\Gamma $ = $−$2 Im($\sqrt {s }$).
VALUE (MeV) DOCUMENT ID TECN  COMMENT
$(3871.70 \pm0.15 {}^{+0.07}_{-0.08}) − {\mit i}(0.19 \pm0.08 {}^{+0.14}_{-0.19})$ 1
ABLIKIM
2024C
 BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c1}}}{(3872)}}$
1  From simultaneous line shape fits of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c1}}}{(3872)}}$ $\rightarrow$ ${{\mathit \gamma}}$ $\lbrack{}$ ${{\mathit D}^{0}}{{\overline{\mathit D}}^{0}}{{\mathit \pi}^{0}}$ $\rbrack{}$ and ${{\mathit \gamma}}$ $\lbrack{}$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $\rbrack{}$. The most prominent pole is reported at $7.04$ $\pm0.15$ ${}^{+0.07}_{-0.08}$ MeV above the ${{\mathit D}^{0}}{{\overline{\mathit D}}^{0}}{{\mathit \pi}^{0}}$ threshold of 3864.66 MeV on the first sheet with respect to the ${{\mathit D}^{*0}}{{\overline{\mathit D}}^{0}}$ channel. The uncertainty in the ${{\mathit D}^{0}}$ width is included in the uncertainty of the pole mass.
References