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

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M176M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 3871.65 \pm0.06}$ OUR AVERAGE $3871.64$ $\pm0.06$ $\pm0.01$ 19.8k 1 AAIJ 2020 S 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 2012 H 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.. 2010 B BABR ${{\mathit B}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit J / \psi}}{{\mathit K}}$ $3871.61$ $\pm0.16$ $\pm0.19$ 6k 4, 3 AALTONEN 2009 AU 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 2008 Y BABR ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $3868.7$ $\pm1.5$ $\pm0.4$ 9.4 AUBERT 2008 Y 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 2004 F 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. • • $3871.695$ $\pm0.067$ $\pm0.068$ 15.6k 6 AAIJ 2020 AD LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit X}}$ $3871.59$ $\pm0.06$ $\pm0.03$ 4.2k 7 AAIJ 2020 S LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}$ $3873.3$ $\pm1.1$ $\pm1.0$ 45 8 ABLIKIM 2019 V BES ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \omega}}{{\mathit J / \psi}}$ $3860.0$ $\pm10.4$ 13.6 9, 3 AGHASYAN 2018 A COMP ${{\mathit \gamma}^{*}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit X}}{{\mathit \pi}^{\pm}}{{\mathit N}^{\,'}}$ $3868.6$ $\pm1.2$ $\pm0.2$ 8 10 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 10 AUBERT 2006 BABR ${{\mathit B}^{-}}$ $\rightarrow$ ${{\mathit K}^{-}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $3873.4$ $\pm1.4$ 25 11 AUBERT 2005 R BABR ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $3871.3$ $\pm0.7$ $\pm0.4$ 730 3, 12 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 13 CHOI 2003 BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$ $3836$ $\pm13$ 58 3, 14 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  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. 7  Using Breit-Wigner parametrization. Superseded by the combined value in AAIJ 2020S. 8  Fit with fixed width and including two resonances, ${{\mathit \chi}_{{c0}}{(3915)}}$ and ${{\mathit X}{(3960)}}$. 9  Could be a different state. 10  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. 11  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 . 12  Superseded by AALTONEN 2009AU. 13  Superseded by CHOI 2011 . 14  A lower mass value can be due to an incorrect momentum scale for soft pions.

References:

AAIJ 2020S 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 AAIJ 2020AD PR D102 092005 Study of the lineshape of the $\chi_{c1}(3872)$ state ABLIKIM 2019V PRL 122 232002 Study of $e^+e^- \to \gamma \omega J/\psi$ and Observation of $X(3872) \to \omega J/\psi$ AGHASYAN 2018A PL B783 334 Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$ ABLIKIM 2014 PRL 112 092001 Observation of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}{(3872)}}$ at BESIII AAIJ 2012H EPJ C72 1972 Observation of ${{\mathit X}{(3872)}}$ Production in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV CHOI 2011 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 DEL-AMO-SANCHEZ 2010B PR D82 011101 Evidence for the Decay ${{\mathit X}{(3872)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \omega}}$ AALTONEN 2009AU PRL 103 152001 Precision Measurement of the ${{\mathit X}{(3872)}}$ Mass in ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decays AUBERT 2008Y PR D77 111101 Study of ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}{(3872)}}{{\mathit K}}$ , with ${{\mathit X}{(3872)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ AUBERT 2006 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 AUBERT 2005R PR D71 071103 Study of the ${{\mathit B}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decay and Measurement of the ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}{(3872)}}{{\mathit K}^{-}}$ Branching Fraction ABAZOV 2004F PRL 93 162002 Observation and Properties of the ${{\mathit X}{(3872)}}$ Decaying to ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV ACOSTA 2004 PRL 93 072001 Observation of the Narrow State ${{\mathit X}{(3872)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 1.96 TeV CHOI 2003 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 ANTONIAZZI 1994 PR D50 4258 Search for Hidden Charm Resonance States Decaying into ${{\mathit J / \psi}}$ or ${{\mathit \psi}^{\,'}}$ Plus Pions