Measurement of deeply virtual Compton scattering at HERA

The cross section for deeply virtual Compton scattering in the reaction ep -> e gamma p has been measured with the ZEUS detector at HERA using integrated luminosities of 95.0 pb-1 of e+p and 16.7 pb-1 of e-p collisions. Differential cross sections are presented as a function of the exchanged-photon virtuality, Q2, and the centre-of-mass energy, W, of the gamma*p system in the region 5 < Q2 < 100 GeV2 and 40 < W < 140 GeV. The measured cross sections rise steeply with increasing W. The measurements are compared to QCD-based calculations.

Note:

23 pages, 6 figures, 3 tables. Minor wording and changes to references Report-no: DESY-03-059

positron p: colliding beams
electron p: colliding beams
photon: electroproduction
Compton scattering: off-shell
differential cross section: momentum transfer
energy dependence
quantum chromodynamics
ZEUS
experimental results
DESY HERA Stor

References(62)

Figures(0)

Automodel behavior of the virtual Compton scattering amplitude in the framework of the Dyson-Jost-Lehmann representation

- Theor.Math.Phys. 19 (1974) 315-324,
- Teor.Mat.Fiz. 19 (1974) 14-26
•
DOI:
- 10.1007/BF01037187

The Nonforward {QCD} Ladder Diagrams

Jochen Bartels
(
- Hamburg U.
)
,
M. Loewe
(
- Hamburg U.
)

- Z.Phys.C 12 (1982) 263
•
DOI:
- 10.1007/BF01558265

Deeply virtual Compton scattering

Xiang-Dong Ji
(
- Maryland U. and
- MIT, LNS and
- Washington U., Seattle
)

- Phys.Rev.D 55 (1997) 7114-7125
•
e-Print:
- hep-ph/9609381
•
DOI:
- 10.1103/PhysRevD.55.7114

Nonforward parton densities and soft mechanism for form-factors and wide angle Compton scattering in QCD

A.V. Radyushkin
(
- Old Dominion U. and
- Jefferson Lab
)

- Phys.Rev.D 58 (1998) 114008
•
e-Print:
- hep-ph/9803316
•
DOI:
- 10.1103/PhysRevD.58.114008

Proof of factorization for deeply virtual Compton scattering in QCD

John C. Collins
(
- Penn State U.
)
,
Andreas Freund
(
- Penn State U.
)

- Phys.Rev.D 59 (1999) 074009
•
e-Print:
- hep-ph/9801262
•
DOI:
- 10.1103/PhysRevD.59.074009

Diffractive exclusive photoproduction in DIS at HERA

- Phys.Rev.D 58 (1998) 114001,
- Phys.Rev.D 59 (1999) 119901 (erratum)
•
e-Print:
- hep-ph/9710356
•
DOI:
- 10.1103/PhysRevD.58.114001

- Fortsch.Phys. 42 347

Gauge-Invariant Decomposition of Nucleon Spin

Xiang-Dong Ji
(
- MIT, LNS and
- Washington U., Seattle
)

- Phys.Rev.Lett. 78 (1997) 610-613
•
e-Print:
- hep-ph/9603249
•
DOI:
- 10.1103/PhysRevLett.78.610

Off diagonal parton distributions and their evolution

Krzysztof J. Golec-Biernat
(
- Durham U.
)
,
Alan D. Martin
(
- Durham U.
)

- Phys.Rev.D 59 (1999) 014029
•
e-Print:
- hep-ph/9807497
•
DOI:
- 10.1103/PhysRevD.59.014029

Deeply virtual Compton scattering at HERA: A Probe of asymptotia

- Phys.Lett.B 460 (1999) 417-424
•
e-Print:
- hep-ph/9806535
•
DOI:
- 10.1016/S0370-2693(99)00803-5

Theory of deeply virtual Compton scattering on the nucleon

Andrei V. Belitsky
(
- Maryland U. and
- SUNY, Stony Brook and
- Wuppertal U.
)
,
Dieter Mueller
(
- Wuppertal U. and
- Regensburg U.
)
,
A. Kirchner
(
- Regensburg U.
)

- Nucl.Phys.B 629 (2002) 323-392
•
e-Print:
- hep-ph/0112108
•
DOI:
- 10.1016/S0550-3213(02)00144-X

A Next-to-leading order analysis of deeply virtual Compton scattering

A. Freund
(
- Regensburg U.
)
,
M.F. McDermott
(
- Liverpool U., Dept. Math.
)

- Phys.Rev.D 65 (2002) 091901
•
e-Print:
- hep-ph/0106124
•
DOI:
- 10.1103/PhysRevD.65.091901

Prompt photon production and observation of deeply virtual Compton scattering

ZEUS

Collaboration

•

P.R.B. Saull
(
- DESY
)

for the collaboration.

•
e-Print:
- hep-ex/0003030

Measurement of deeply virtual Compton scattering at HERA

H1

Collaboration

•

C. Adloff

et al.

- Phys.Lett.B 517 (2001) 47-58
•
e-Print:
- hep-ex/0107005
•
DOI:
- 10.1016/S0370-2693(01)00939-X

Measurement of the beam spin azimuthal asymmetry associated with deeply virtual Compton scattering

HERMES

Collaboration

•

A. Airapetian
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.Lett. 87 (2001) 182001
•
e-Print:
- hep-ex/0106068
•
DOI:
- 10.1103/PhysRevLett.87.182001

Observation of exclusive deeply virtual Compton scattering in polarized electron beam asymmetry measurements

CLAS

Collaboration

•

S. Stepanyan
(
- Christopher Newport U. and
- Jefferson Lab
)

et al.

- Phys.Rev.Lett. 87 (2001) 182002
•
e-Print:
- hep-ex/0107043
•
DOI:
- 10.1103/PhysRevLett.87.182002

Vertex Triggering Using Time Difference Measurements in the ZEUS Central Tracking Detector

N. Harnew
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
G.P. Heath
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
M.D. Jeffs
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
J. Nash
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
G. Salmon
(
- Bristol U. and
- Oxford U. and
- Rutherford
)

et al.

- Nucl.Instrum.Meth.A 279 (1989) 290-296
•
DOI:
- 10.1016/0168-9002(89)91096-6

The Performance of the Zeus central tracking detector z-by-timing electronics in a transputer based data acquisition system

et al.

- Nucl.Phys.B Proc.Suppl. 32 (1993) 181-188,
- In *Como 1992, Proceedings, Advanced technology and particle physics* 181-188,
- Nucl. Phys. B, Proc. Suppl. 32 (1993) 181-188) and Oxford Univ. - OUNP-92-14 (92,rec.Oct.) 8 p
•
DOI:
- 10.1016/0920-5632(93)90023-Y

The Design and construction of the ZEUS central tracking detector

ZEUS

Collaboration

•

B. Foster
(
- Bristol U.
)

et al.

- Nucl.Instrum.Meth.A 338 (1994) 254-283
•
DOI:
- 10.1016/0168-9002(94)91313-7

Design and construction of the ZEUS barrel calorimeter.

et al.

- Nucl.Instrum.Meth.A 309 (1991) 77-100
•
DOI:
- 10.1016/0168-9002(91)90094-7

Construction and beam test of the ZEUS forward and rear calorimeter

ZEUS

Collaboration

•

A. Andresen
(
- Hamburg U., Inst. Theor. Phys. II
)

et al.

- Nucl.Instrum.Meth.A 309 (1991) 101-142
•
DOI:
- 10.1016/0168-9002(91)90095-8

Design and implementation of a high precision readout system for the ZEUS calorimeter

A. Caldwell
(
- Nevis Labs, Columbia U.
)
,
I. Gialas
(
- Nevis Labs, Columbia U.
)
,
S. Mishra
(
- Nevis Labs, Columbia U.
)
,
J. Parsons
(
- Nevis Labs, Columbia U.
)
,
S. Ritz
(
- Nevis Labs, Columbia U.
)

et al.

- Nucl.Instrum.Meth.A 321 (1992) 356-364
•
DOI:
- 10.1016/0168-9002(92)90413-X

Beam tests of the ZEUS barrel calorimeter

et al.

- Nucl.Instrum.Meth.A 336 (1993) 23-52
•
DOI:
- 10.1016/0168-9002(93)91078-2

The Presampler for the forward and rear calorimeter in the ZEUS detector

et al.

- Nucl.Instrum.Meth.A 382 (1996) 419-429,
- ICFA Instrum.Bull. 1996 (1996) F18-F37
•
e-Print:
- hep-ex/9609006
•
DOI:
- 10.1016/S0168-9002(96)00776-0

The ZEUS forward plug calorimeter with lead scintillator plates and WLS fiber readout

et al.

- Nucl.Instrum.Meth.A 450 (2000) 235-252
•
e-Print:
- hep-ex/9912045
•
DOI:
- 10.1016/S0168-9002(00)00274-6

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