Observation of a broad structure in the $\pi^+ \pi^- J/\psi$ mass spectrum around 4.26-GeV/c$^2$ - INSPIRE

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Observation of a broad structure in the $\pi^+ \pi^- J/\psi$ mass spectrum around 4.26-GeV/c $^2$

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

Jun, 2005

7 pages

Published in:

Phys.Rev.Lett. 95 (2005) 142001

e-Print:

hep-ex/0506081 [hep-ex]

DOI:

10.1103/PhysRevLett.95.142001

PDG:

{{\mathit \psi}{(4230)}}

\rightarrow

{{\mathit e}^{+}}{{\mathit e}^{-}}

Report number:

BABAR-PUB-05-29,
SLAC-PUB-11320,
BABAR-PUB-05-029

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract:

We study initial-state radiation events,

e^+e^- \to \gamma_{ISR}\pi^+\pi^-J/\psi

, with data collected with the BaBar detector. We observe an accumulation of events near 4.26 GeV/

c^2

in the invariant-mass spectrum of

\pi^+\pi^-J/\psi

. Fits of the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/

c^2

is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/

c^2

, depending on the fit hypothesis.

Note:

7 pages, 3 postscript figues, 0 tables submitted to Physics Review Letter Report-no: BABAR-PUB-05/29, SLAC-PUB-11320 Journal-ref: Phys. Rev. Lett. 95, 142001 (2005) DOI: 10.1103/PhysRevLett.95.142001

14.40.Gx
13.66.Bc
13.25.Gv
electron-positron inclusive interactions
X mesons
electron positron: colliding beams
electron positron: annihilation
radiation: initial-state interaction
J/psi(3100): electroproduction
J/psi(3100): leptonic decay

References(12)

Figures(0)

Observation of a narrow charmonium-like state in exclusive $B^\pm \to K^\pm \pi^+ \pi^- J/\psi$ decays

Belle

Collaboration

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D0

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)

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The BaBar detector

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e-Print:
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