${{\mathit \chi}_{{{c1}}}{(3872)}}$ MASS FROM ${{\mathit J / \psi}}{{\mathit X}}$ MODE

INSPIRE   PDGID:
M176M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 3871.64 \pm0.06}$ OUR AVERAGE
$3870.2$ $\pm0.7$ $\pm0.3$ 24.6
ABLIKIM
2023W
 BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \omega}}$
$3871.64$ $\pm0.06$ $\pm0.01$ 19.8k 1
AAIJ
2020S
 LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}$
$3871.9$ $\pm0.7$ $\pm0.2$ 20
ABLIKIM
2014
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}}$
$3871.95$ $\pm0.48$ $\pm0.12$ 0.6k
AAIJ
2012H
 LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
$3871.85$ $\pm0.27$ $\pm0.19$ 170 2
CHOI
2011
BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$
$3873$ ${}^{+1.8}_{-1.6}$ $\pm1.3$ 27 3
DEL-AMO-SANCH..
2010B
 BABR ${{\mathit B}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit J / \psi}}{{\mathit K}}$
$3871.61$ $\pm0.16$ $\pm0.19$ 6k 4, 3
AALTONEN
2009AU
 CDF2 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
$3871.4$ $\pm0.6$ $\pm0.1$ 93.4
AUBERT
2008Y
 BABR ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3868.7$ $\pm1.5$ $\pm0.4$ 9.4
AUBERT
2008Y
 BABR ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3871.8$ $\pm3.1$ $\pm3.0$ 522 5, 3
ABAZOV
2004F
 D0 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$3871.57$ $\pm0.09$ 155 6
AAIJ
2023AP
 LHCB ${{\mathit B}_{{{s}}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$3871.695$ $\pm0.067$ $\pm0.068$ 15.6k 7
AAIJ
2020AD
 LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
$3871.59$ $\pm0.06$ $\pm0.03$ 4.2k 8
AAIJ
2020S
 LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}$
$3873.3$ $\pm1.1$ $\pm1.0$ 45 9
ABLIKIM
2019V
 BES ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \omega}}{{\mathit J / \psi}}$
$3860.0$ $\pm10.4$ 13.6 10, 3
AGHASYAN
2018A
 COMP ${{\mathit \gamma}^{*}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit X}}{{\mathit \pi}^{\pm}}{{\mathit N}^{\,'}}$
$3868.6$ $\pm1.2$ $\pm0.2$ 8 11
AUBERT
2006
BABR ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3871.3$ $\pm0.6$ $\pm0.1$ 61 11
AUBERT
2006
BABR ${{\mathit B}^{-}}$ $\rightarrow$ ${{\mathit K}^{-}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3873.4$ $\pm1.4$ 25 12
AUBERT
2005R
 BABR ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3871.3$ $\pm0.7$ $\pm0.4$ 730 3, 13
ACOSTA
2004
CDF2 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
$3872.0$ $\pm0.6$ $\pm0.5$ 36 14
CHOI
2003
BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$
$3836$ $\pm13$ 58 3, 15
ANTONIAZZI
1994
E705 300 ${{\mathit \pi}^{\pm}}$ ${}^{}\mathrm {Li}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$
1  Calculated from ${\mathit m}_{{{\mathit \chi}_{{{c1}}}{(3872)}}}–{\mathit m}_{{{\mathit \psi}{(2S)}}}$ = $185.54$ $\pm0.06$ MeV obtained by combining the data with ${{\mathit \chi}_{{{c1}}}{(3872)}}$ produced in ${{\mathit B}^{+}}$ decays from AAIJ 2020S and inclusive ${{\mathit b}}$-hadron decays from AAIJ 2020AD and using ${\mathit m}_{{{\mathit \psi}{(2S)}}}$ = 3686.097 MeV. Breit-Wigner parametrization.
2  The mass difference for the ${{\mathit \chi}_{{{c1}}}{(3872)}}$ produced in ${{\mathit B}^{+}}$ and ${{\mathit B}^{0}}$ decays is ($-0.71$ $\pm0.96$ $\pm0.19$) MeV.
3  Width consistent with detector resolution.
4  A possible equal mixture of two states with a mass difference greater than 3.6 MeV/c${}^{2}$ is excluded at 95$\%$ CL.
5  Calculated from the corresponding ${\mathit m}_{{{\mathit \chi}_{{{c1}}}{(3872)}}}$ $−$ ${\mathit m}_{{{\mathit J / \psi}}}$ using ${\mathit m}_{{{\mathit J / \psi}}}$=3096.916 MeV.
6  From a fit of a relativistic ${\mathit S}{\mathrm -wave}$ Breit-Wigner convolved with the detector resolution. The width of ${{\mathit \chi}_{{{c1}}}{(3872)}}$ is constrained to the PDG 2022 value. Systematic errors not evaluated.
7  Using ${{\mathit \chi}_{{{c1}}}{(3872)}}$ produced in inclusive ${{\mathit b}}$-hadron decays and ${\mathit m}_{{{\mathit \psi}{(2S)}}}$ = $3686.097$ $\pm0.010$ MeV. Breit-Wigner parametrization. Superseded by the combined value in AAIJ 2020S.
8  Using Breit-Wigner parametrization. Superseded by the combined value in AAIJ 2020S.
9  Fit with fixed width and including two resonances, ${{\mathit \chi}_{{{c0}}}{(3915)}}$ and ${{\mathit X}{(3960)}}$.
10  Could be a different state.
11  Calculated from the corresponding ${\mathit m}_{{{\mathit \chi}_{{{c1}}}{(3872)}}}–{\mathit m}_{{{\mathit \psi}{(2S)}}}$ using ${\mathit m}_{{{\mathit \psi}{(2S)}}}$ = 3686.093 MeV. Superseded by AUBERT 2008Y.
12  Calculated from the corresponding ${\mathit m}_{{{\mathit \chi}_{{{c1}}}{(3872)}}}–{\mathit m}_{{{\mathit \psi}{(2S)}}}$ using ${\mathit m}_{{{\mathit \psi}{(2S)}}}$ = 3685.96MeV. Superseded by AUBERT 2006.
13  Superseded by AALTONEN 2009AU.
14  Superseded by CHOI 2011.
15  A lower mass value can be due to an incorrect momentum scale for soft pions.
References