Measurement of the gamma gamma* ---> pi0 transition form factor

We study the reaction e+e- --> e+e-pi0 and measure the gamma gamma* --> pi0 transition form factor in the momentum transfer range from 4 to 40 GeV^2. The analysis is based on 442 fb^-1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV.

Note:

19 pages, 23 postscript figures, submitted to Phys. Rev. D

13.40.Gp
12.38.Qk
14.40.Aq
electron positron: inelastic scattering
exchange: two-photon
pi0: photoproduction
form factor: transition: momentum transfer dependence
experimental results
BaBar
SLAC PEP Stor

References(29)

Figures(25)

Two Photon Mechanism of Particle Production by High-Energy Colliding Beams

Stanley J. Brodsky
(
- SLAC
)
,
Toichiro Kinoshita
(
- Cornell U., LNS
)
,
Hidezumi Terazawa
(
- Cornell U., LNS
)

- Phys.Rev.D 4 (1971) 1532-1557
•
DOI:
- 10.1103/PhysRevD.4.1532

Exclusive Processes in Perturbative Quantum Chromodynamics

G.Peter Lepage
(
- Cornell U., LNS
)
,
Stanley J. Brodsky
(
- SLAC
)

- Phys.Rev.D 22 (1980) 2157
•
DOI:
- 10.1103/PhysRevD.22.2157

The Pi gamma transition form-factor and the pion wave function

P. Kroll
(
- Wuppertal U.
)
,
M. Raulfs
(
- Wuppertal U.
)

- Phys.Lett.B 387 (1996) 848-854
•
e-Print:
- hep-ph/9605264
•
DOI:
- 10.1016/0370-2693(96)01101-X

Perturbative effects in the form-factor gamma gamma* ---> pi0 and extraction of the pion wave function from CLEO data

A. Schmedding
(
- Wurzburg U.
)
,
Oleg I. Yakovlev
(
- Wurzburg U.
)

- Phys.Rev.D 62 (2000) 116002
•
e-Print:
- hep-ph/9905392
•
DOI:
- 10.1103/PhysRevD.62.116002

Analytic coupling and Sudakov effects in exclusive processes: Pion and gamma* gamma ---> pi0 form-factors

- Eur.Phys.J.C 18 (2000) 137-156
•
e-Print:
- hep-ph/0005218
•
DOI:
- 10.1007/s100520000510

Pion light cone wave function and pion distribution amplitude in the Nambu-Jona-Lasinio model

Enrique Ruiz Arriola
(
- Granada U.
)
,
Wojciech Broniowski
(
- Cracow, INP
)

- Phys.Rev.D 66 (2002) 094016
•
e-Print:
- hep-ph/0207266
•
DOI:
- 10.1103/PhysRevD.66.094016

Lattice measurements of nonlocal quark condensates, vacuum correlation length, and pion distribution amplitude in QCD

A.P. Bakulev
(
- Dubna, JINR
)
,
S.V. Mikhailov
(
- Dubna, JINR
)

- Phys.Rev.D 65 (2002) 114511
•
e-Print:
- hep-ph/0203046
•
DOI:
- 10.1103/PhysRevD.65.114511

Unbiased analysis of CLEO data at NLO and pion distribution amplitude

Alexander P. Bakulev
(
- Dubna, JINR
)
,
S.V. Mikhailov
(
- Dubna, JINR
)
,
N.G. Stefanis
(
- Ruhr U., Bochum
)

- Phys.Rev.D 67 (2003) 074012
•
e-Print:
- hep-ph/0212250
•
DOI:
- 10.1103/PhysRevD.67.074012

CLEO and E791 data: A Smoking gun for the pion distribution amplitude?

Alexander P. Bakulev
(
- Dubna, JINR
)
,
S.V. Mikhailov
(
- Dubna, JINR
)
,
N.G. Stefanis
(
- Ruhr U., Bochum
)

- Phys.Lett.B 578 (2004) 91-98
•
e-Print:
- hep-ph/0303039
•
DOI:
- 10.1016/j.physletb.2003.10.033

Impact of the higher twist effects on the gamma gamma* ---> pi0 transition form-factor

S.S. Agaev
(
- Regensburg U. and
- Baku State U.
)

- Phys.Rev.D 72 (2005) 114010,
- Phys.Rev.D 73 (2006) 059902 (erratum)
•
e-Print:
- hep-ph/0511192
•
DOI:
- 10.1103/PhysRevD.72.114010

Resummation of large logarithms in gamma* pi0 ---> gamma

- JHEP 06 (2007) 039
•
e-Print:
- 0704.3782
•
DOI:
- 10.1088/1126-6708/2007/06/039

A Measurement of the pi0, eta and eta-prime electromagnetic form-factors

CELLO

Collaboration

•

H.J. Behrend
(
- DESY
)

et al.

- Z.Phys.C 49 (1991) 401-410
•
DOI:
- 10.1007/BF01549692

Measurements of the meson - photon transition form-factors of light pseudoscalar mesons at large momentum transfer

CLEO

Collaboration

•

J. Gronberg
(
- UC, Santa Barbara
)

et al.

- Phys.Rev.D 57 (1998) 33-54
•
e-Print:
- hep-ex/9707031
•
DOI:
- 10.1103/PhysRevD.57.33

The BaBar detector

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Nucl.Instrum.Meth.A 479 (2002) 1-116
•
e-Print:
- hep-ex/0105044
•
DOI:
- 10.1016/S0168-9002(01)02012-5

The Two photon particle production mechanism. Physical problems. Applications. Equivalent photon approximation

V.M. Budnev
(
- Sobolev IM, Novosibirsk
)
,
I.F. Ginzburg
(
- Sobolev IM, Novosibirsk
)
,
G.V. Meledin
(
- Sobolev IM, Novosibirsk
)
,
V.G. Serbo
(
- Sobolev IM, Novosibirsk
)

- Phys.Rept. 15 (1975) 181-281
•
DOI:
- 10.1016/0370-1573(75)90009-5

A Process Independent Radiative Correction Formula for Single Tag and Double Tag Measurements of $\gamma \gamma$ Reactions

Saro Ong
(
- College de France and
- Picardie U.
)
,
Paul Kessler
(
- College de France
)

- Phys.Rev.D 38 (1988) 2280
•
DOI:
- 10.1103/PhysRevD.38.2280

GEANT4 - A Simulation Toolkit

GEANT4

Collaboration

•

S. Agostinelli
(
- Genoa U.
)

et al.

- Nucl.Instrum.Meth.A 506 (2003) 250-303
•
DOI:
- 10.1016/S0168-9002(03)01368-8

High-energy physics event generation with PYTHIA 5.7 and JETSET 7.4

Torbjorn Sjostrand
(
- CERN
)

- Comput.Phys.Commun. 82 (1994) 74-90,
- CERN Geneva - TH. 7111 (93/12,rec.Jan.94) 17 p. and e: CERN th-7111-93
•
DOI:
- 10.1016/0010-4655(94)90132-5