Observation of a new charmonium state in double charmonium production in e+ e- annihilation at s**(1/2) ~ 10.6-GeV

Abe, Kazuo; Adachi, I.; Aihara, H.; Arinstein, K.; Asano, Y.; Aulchenko, V.; Aushev, T.; Aziz, T.; Bakich, A.M.; Balagura, V.

doi:10.1103/PhysRevLett.98.082001

Observation of a new charmonium state in double charmonium production in e+ e- annihilation at s**(1/2) ~ 10.6-GeV

Belle

Collaboration

Jul, 2005

10 pages

Published in:

Phys.Rev.Lett. 98 (2007) 082001

e-Print:

hep-ex/0507019 [hep-ex]

DOI:

10.1103/PhysRevLett.98.082001

PDG:

{{\mathit \eta}_{{{c}}}{(1S)}}

MASS

Report number:

BELLE-CONF-0517,
LP2005-152,
EPS05-489

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

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Abstract:

We report the first observation of a new charmonium state at a mass of

(3.943 \pm 0.006 \pm 0.006) {GeV}/c^2

. This state, called X(3940), is observed in the process

e^+ e^- \to J/\psi X(3940)

in the spectrum of masses recoiling against a reconstructed

J/\psi

. We also observe the decay of the X(3940) into

D^* \bar{D}

and measure the intrinsic width of this state to be less than

52 MeV/c^2

at the 90% C.L. These results are obtained from a

350 fb^{-1}

data sample collected with the Belle detector near the

\Upsilon(4S)

resonance, at the KEKB asymmetric energy

e^+ e^-

collider.

Note:

BELLE-CONF-0517

14.40.Gx
13.66.Bc
12.38.Bx
electron positron: colliding beams
electron positron: annihilation
charmonium
J/psi(3100): associated production
J/psi(3100): leptonic decay
mass spectrum: recoil
X(3940): hadronic decay

References(14)

Figures(0)

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Study of double charmonium production in e+ e- annihilation at s**(1/2) ~ 10.6-GeV

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