The Eta(c)(2980) formation in two photon collisions at LEP energies - INSPIRE

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The Eta(c)(2980) formation in two photon collisions at LEP energies

DELPHI

Collaboration

May, 2003

12 pages

Published in:

Eur.Phys.J.C 31 (2003) 481-489

e-Print:

hep-ex/0311002 [hep-ex]

DOI:

10.1140/epjc/s2003-01384-0

PDG:

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

\rightarrow

{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}

Report number:

CERN-EP-2003-035

Experiments:

CERN-LEP-DELPHI

View in:

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Abstract:

eta_c(2980) production in gamma-gamma interactions has been detected via its decays into K0_s K+/- pi-/+, K+ K- K+ K- and K+ K- pi+ pi- in the data taken with the DELPHI detector at LEP1 and LEP2 energies. The two-photon radiative width averaged over all observed decay channels is \Gamma_{\gamma\gamma} = 13.9 +/- 2.0 (stat.) +/- 1.4 (syst.) +/- 2.7 (BR) keV. No direct decay channel eta_c -> pi+ pi- pi+ pi- has been observed. An upper limit

\Gamma_{\gamma\gamma}

< 5.5 keV at 95% confidence level has been evaluated for this decay mode.

Note:

15 pages, 6 figures, Accepted by Eur. Phys. J. C Report-no: CERN-EP/2003-035 Journal-ref: Eur. Phys. J. C31 (2003) 481-489

electron positron: colliding beams
exchange: two-photon
photon photon: interaction
eta/c(2980): photoproduction
eta/c(2980): hadronic decay
eta/c(2980): width
eta/c(2980): branching ratio
mass spectrum
DELPHI
experimental results

References(21)

Figures(0)

Heavy Quark Systems

Waikwok Kwong
(
- Chicago U., EFI and
- Chicago U.
)
,
Jonathan L. Rosner
(
- Chicago U., EFI and
- Chicago U.
)
,
Chris Quigg
(
- Fermilab
)

- Ann.Rev.Nucl.Part.Sci. 37 (1987) 325-382
•
DOI:
- 10.1146/annurev.ns.37.120187.001545

Quarkonium Annihilation Rates

Waikwok Kwong
(
- Chicago U., EFI
)
,
Paul B. Mackenzie
(
- Fermilab
)
,
Rogerio Rosenfeld
(
- Chicago U., EFI
)
,
Jonathan L. Rosner
(
- Chicago U., EFI
)

- Phys.Rev.D 37 (1988) 3210
•
DOI:
- 10.1103/PhysRevD.37.3210

Two photon widths of singlet positronium and quarkonium with arbitrary total angular momentum

E.S. Ackleh
(
- Tennessee U.
)
,
Ted Barnes
(
- Oak Ridge and
- Tennessee U.
)

- Phys.Rev.D 45 (1992) 232-240
•
DOI:
- 10.1103/PhysRevD.45.232

Hadron Properties from QCD Sum Rules

- Phys.Rept. 127 (1985) 1
•
DOI:
- 10.1016/0370-1573(85)90065-1

Evidence for Exclusive $\eta_c$ Production in $\gamma \gamma$ Interactions

PLUTO

Collaboration

•

Christoph Berger
(
- Aachen, Tech. Hochsch.
)

et al.

- Phys.Lett.B 167 (1986) 120-126,
- Phys. Lett. B167 ( 1986) 120-126 and Hamburg Desy - DESY 85-130 (85,REC.NOV.) 13p
•
DOI:
- 10.1016/0370-2693(86)90558-7

Hadronic Decays of the $\eta_c$ (2980)

Mark-III

Collaboration

•

R.M. Baltrusaitis
(
- Caltech
)

et al.

- Phys.Rev.D 33 (1986) 629
•
DOI:
- 10.1103/PhysRevD.33.629

Direct Observation and Partial Width Measurement of $\gamma \gamma$ Decay of Charmonium States

Annecy(LAPP)-CERN-Genoa-Lyon-Oslo-Rome-Strasbourg-Turin

Collaboration

•

C. Baglin
(
- Annecy, LAPP
)

et al.

- Phys.Lett.B 187 (1987) 191,
- Thessaloniki N anti-N 1986:349
•
DOI:
- 10.1016/0370-2693(87)90098-0

Charmonium Production in Photon-photon Collisions

TPC/Two Gamma

Collaboration

•

H. Aihara

et al.

- Phys.Rev.Lett. 60 (1988) 2355
•
DOI:
- 10.1103/PhysRevLett.60.2355

Study of $\eta_c$ Production in Two Photon Collisions

TASSO

Collaboration

•

W. Braunschweig
(
- Aachen, Tech. Hochsch.
)

et al.

- Z.Phys.C 41 (1989) 533
•
DOI:
- 10.1007/BF01564698

Measurement of $\gamma \gamma$ Widths of Charmonium States

CLEO

Collaboration

•

W.Y. Chen
(
- Purdue U.
)

et al.

- Phys.Lett.B 243 (1990) 169-174
•
DOI:
- 10.1016/0370-2693(90)90975-C

Study of the eta(c) decays

DM2

Collaboration

•

D. Bisello
(
- Padua U. and
- INFN, Padua
)

et al.

- Nucl.Phys.B 350 (1991) 1-24
•
DOI:
- 10.1016/0550-3213(91)90251-R

Determination of the radiative decay width of the eta(c) meson

ARGUS

Collaboration

•

H. Albrecht
(
- DESY
)

et al.

- Phys.Lett.B 338 (1994) 390-396
•
DOI:
- 10.1016/0370-2693(94)91395-1

Formation of the $eta_c$ in two photon collisions at LEP

L3

Collaboration

•

M. Acciarri

et al.

- Phys.Lett.B 461 (1999) 155-166
•
e-Print:
- hep-ex/9909008
•
DOI:
- 10.1016/S0370-2693(99)00784-4

Measurements of the mass, total width and two photon partial width of the eta(c) meson

CLEO

Collaboration

•

G. Brandenburg
(
- Harvard U.
)

et al.

- Phys.Rev.Lett. 85 (2000) 3095-3099
•
e-Print:
- hep-ex/0006026
•
DOI:
- 10.1103/PhysRevLett.85.3095

The DELPHI detector at LEP

DELPHI

Collaboration

•

P.A. Aarnio

et al.

- Nucl.Instrum.Meth.A 303 (1991) 233-276
•
DOI:
- 10.1016/0168-9002(91)90793-P

Performance of the DELPHI detector

DELPHI

Collaboration

•

P. Abreu

et al.

- Nucl.Instrum.Meth.A 378 (1996) 57-100
•
DOI:
- 10.1016/0168-9002(96)00463-9

Architecture and performance of the DELPHI trigger system

V Bocci
(
- INFN, Rome2
)
,
P.S.L Booth
(
- Liverpool U.
)
,
M Bozzo
(
- Genoa U. and
- INFN, Genoa
)
,
A Branco
(
- CERN and
- Rio de Janeiro, CBPF
)
,
J Buytaert
(
- CERN
)

et al.

- Nucl.Instrum.Meth.A 362 (1995) 361-385
•
DOI:
- 10.1016/0168-9002(95)00289-8

- Nucl.Phys.B 184 265

Exclusive Hadron Production in Two Photon Reactions

M. Poppe
(
- Hamburg U.
)

- Int.J.Mod.Phys.A 1 (1986) 545-668
•
DOI:
- 10.1142/S0217751X8600023X

Measurements of the mass and full width of the eta(c) meson

BES

Collaboration

•

J.Z. Bai

et al.

- Phys.Lett.B 555 (2003) 174-180
•
e-Print:
- hep-ex/0301004
•
DOI:
- 10.1016/S0370-2693(03)00074-1

Review of particle physics. Particle Data Group

et al.

- Eur.Phys.J.C 15 (2000) 1-878