Spin-Parity Analysis of $p\bar{p}$ Mass Threshold Structure in $J/\psi$ and $\psi^\prime$ Radiative Decays

Ablikim, M.; Achasov, M.N.; Alberto, D.; Ambrose, D.J.; An, F.F.; An, Q.; An, Z.H.; Bai, J.Z.; Baldini Ferroli, R.B.F.; Ban, Y.

doi:10.1103/PhysRevLett.108.112003

Spin-Parity Analysis of $p\bar{p}$ Mass Threshold Structure in $J/\psi$ and $\psi^\prime$ Radiative Decays

BESIII

Collaboration

•

M. Ablikim
(
- Beijing, Inst. High Energy Phys.
)

Dec, 2011

5 pages

Published in:

Phys.Rev.Lett. 108 (2012) 112003

e-Print:

1112.0942 [hep-ex]

DOI:

10.1103/PhysRevLett.108.112003

PDG:

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

\rightarrow

{{\mathit \gamma}}{{\mathit X}{(1835)}}

\rightarrow

{{\mathit \gamma}}{{\mathit p}}{{\overline{\mathit p}}}

Experiments:

BEPC-BES-III

View in:

pdf

reference search139 citations

Citations per year

Abstract: (arXiv)

A partial wave analysis of the

p \bar{p}

mass-threshold enhancement in the reaction

J/\psi\rightarrow\gamma p\bar{p}

is used to determine: its

J^{PC}

quantum numbers to be

0^{-+}

; its peak mass to be below threshold at

M=1832^{+19}_{-5} {\rm(stat.)}^{+18}_{-17} {\rm (syst.)}\pm19 {\rm (model)} {\rm MeV}/c^2

; and its total width to be

\Gamma<76 {\rm MeV}/c^2

at the 90% C.L. The product branching ratio is measured to be

B(J/\psi\rightarrow\gamma X(p\bar{p}))B(X(p\bar{p})\rightarrow p\bar{p})=(9.0^{+0.4}_{-1.1} {\rm (stat.)}^{+1.5}_{-5.0} {\rm (syst.)}\pm2.3 {\rm (model)})\times10^{-5}

. A similar analysis performed on

\psi^\prime\rightarrow\gamma p\bar{p}

decays shows, for the first time, the presence of a corresponding enhancement with a production rate relative to that for

J/\psi

decays of

R=(5.08^{+0.71}_{-0.45} {\rm (stat.)}^{+0.67}_{-3.58} {\rm (syst.)}\pm0.12 {\rm (model)})%

.

Note:

5 pages, 3 figures, submitted to Phys. Rev. Lett

13.20.Gd
12.40.Yx
13.75.Cs
12.39.Mk
electron positron: annihilation
J/psi(3100): radiative decay
psi(3685): radiative decay
p: pair production
mass spectrum: (p anti-p)
partial wave analysis

References(29)

Figures(0)

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Spin-Parity Analysis of ppˉp\bar{p}ppˉ​ Mass Threshold Structure in J/ψJ/\psiJ/ψ and ψ′\psi^\primeψ′ Radiative Decays

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Spin-Parity Analysis of $p\bar{p}$ Mass Threshold Structure in $J/\psi$ and $\psi^\prime$ Radiative Decays