#### ${{\boldsymbol \chi}_{{c1}}{(3872)}}$ WIDTH

VALUE (MeV) CL% EVTS DOCUMENT ID TECN  COMMENT
 $\bf{ 1.19 \pm0.21}$ OUR AVERAGE  Error includes scale factor of 1.1.
$1.39$ $\pm0.24$ $\pm0.10$ 15.6k 1
LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
$0.96$ ${}^{+0.19}_{-0.18}$ $\pm0.21$ 4.2k 2
 2020 S
LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$<2.4$ 90
 2014
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}}$
$<1.2$ 90
 2011
BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$
$<3.3$ 90
 2008 Y
BABR ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$<4.1$ 90 69
 2006
BABR ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$
$<2.3$ 90 36 3
 2003
BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$
 1 Using ${{\mathit \chi}_{{c1}}{(3872)}}$ produced in inclusive ${{\mathit b}}$-hadron decays. Breit-Wigner parametrization.
 2 Using Breit-Wigner parametrization. Partially overlapping dataset with that of AAIJ 2020AD.
 3 Superseded by CHOI 2011 .
References:
PR D102 092005 Study of the lineshape of the $\chi_{c1}(3872)$ state
JHEP 2008 123 Study of the $\psi_2(3823)$ and $\chi_{c1}(3872)$ states in $B^+ \rightarrow \left( J\psi\pi^+\pi^-\right)K^+$ decays
PRL 112 092001 Observation of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}{(3872)}}$ at BESIII
PR D84 052004 Bounds on the Width, Mass Difference and other Properties of ${{\mathit X}{(3872)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$ Decays
PR D77 111101 Study of ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}{(3872)}}{{\mathit K}}$ , with ${{\mathit X}{(3872)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
PR D73 011101 Study of the ${{\mathit X}{(3872)}}$ and ${{\mathit Y}{(4260)}}$ in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{0}}$ and ${{\mathit B}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{-}}$ Decays
PRL 91 262001 Observation of a Narrow Charmoniumlike State in Exclusive ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$ Decay