Observation of $X(2370)$ and search for X(2120) in $J/\psi \rightarrow \gamma K{\bar{K}} \eta '$

Ablikim, M.; Achasov, M.N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, Q.; Lavania, Anita; Bai, Y.

doi:10.1140/epjc/s10052-020-8078-4

Observation of $X(2370)$ and search for X(2120) in $J/\psi \rightarrow \gamma K{\bar{K}} \eta '$

BESIII

Collaboration

Dec 24, 2019

11 pages

Published in:

Eur.Phys.J.C 80 (2020) 8, 746

Published: Aug 17, 2020

e-Print:

1912.11253 [hep-ex]

DOI:

10.1140/epjc/s10052-020-8078-4

PDG:

{{\mathit J / \psi}{(1S)}}

\rightarrow

{{\mathit \gamma}}{{\mathit X}{(2370)}}

\rightarrow

{{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}^{\,'}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search31 citations

Citations per year

Abstract: (Springer)

Using a sample of

1.31\times 10^{9} ~J/\psi

events collected with the BESIII detector, we perform a study of

J/\psi \rightarrow \gamma K{\bar{K}}\eta '

. X(2370) is observed in the

K{\bar{K}}\eta '

invariant-mass distribution with a statistical significance of

8.3\sigma

. Its resonance parameters are measured to be

M=2341.6\pm 6.5 \, \text {(stat.)} \pm 5.7 \, \text {(syst.)}~ \hbox {MeV}/c^{2}

and

\Gamma = 117\pm 10 \, \text {(stat.)}\pm 8 \, \text {(syst.)}~\hbox {MeV}

. The product branching fractions for

J/\psi \rightarrow \gamma X(2370),X(2370)\rightarrow K^{+}K^{-}\eta '

and

J/\psi \rightarrow \gamma X(2370),X(2370)\rightarrow K_{S}^{0}K_{S}^{0}\eta '

are determined to be

(1.79\pm 0.23\, \text {(stat.)}\pm 0.65\,\text {(syst.)})\times 10^{-5}

and

(1.18\pm 0.32\, \text {(stat.)}\pm 0.39\, \text {(syst.)})\times 10^{-5}

, respectively. No evident signal for X(2120) is observed in the

K{\bar{K}}\eta '

invariant-mass distribution. The upper limits for the product branching fractions of

{\mathcal {B}}(J/\psi \rightarrow \gamma X(2120)\rightarrow \gamma K^{+} K^{-} \eta ')

and

{\mathcal {B}}(J/\psi \rightarrow \gamma X(2120)\rightarrow \gamma K_{S}^{0} K_{S}^{0} \eta ')

are determined to be

1.49\times 10^{-5}

and

6.38\times 10^{-6}

at the 90% confidence level, respectively.

13.66.Bc
14.40.Be
electron positron: annihilation
electron positron: colliding beams
J/psi(3100): radiative decay
eta(958)
X(2370)
hadronic decay
X(2120)
mass spectrum: (K anti-K eta(958))

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Observation of X(2370)X(2370)X(2370) and search for X(2120) in J/ψ→γKKˉη′J/\psi \rightarrow \gamma K{\bar{K}} \eta 'J/ψ→γKKˉη′

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Observation of $X(2370)$ and search for X(2120) in $J/\psi \rightarrow \gamma K{\bar{K}} \eta '$