Inclusive photoproduction of neutral pions in the photon hemisphere at HERA

The inclusive cross section for the photoproduction of neutral pions has been measured as a function of the transverse momentum, rapidity, and Feynman x of the pizero mesons at an average photon--proton centre-of-mass energy of 208 GeV and for photon virtualities below Q^2=0.01 GeV^2. The pizero measurement extends the range covered by previous charged particle measurements at HERA by two units of rapidity in the photon direction down to a value of -5.5 in the gamma p centre-of-mass frame. The pizero transverse momentum distribution is well described over the whole measured range by a power law ansatz, while an exponential fit falls below the data at transverse momentum values above 1.5 GeV/c. Good agreement with the predictions of the Monte Carlo models PYTHIA and PHOJET is found. In the context of the PYTHIA model the data are inconsistent with large intrinsic transverse momentum values in the photon.

electron positron: colliding beams
electron positron: inclusive reaction
pi0: photoproduction
pi0: radiative decay
differential cross section: transverse momentum
rapidity dependence
x-dependence
mass spectrum: two-photon
numerical calculations: Monte Carlo
H1

References(43)

Figures(0)

Inclusive charged particle cross-sections in photoproduction at HERA

H1

Collaboration

•

I. Abt

et al.

- Phys.Lett.B 328 (1994) 176-186
•
DOI:
- 10.1016/0370-2693(94)90448-0

Charged particle cross-sections in photoproduction and extraction of the gluon density in the photon

H1

Collaboration

•

C. Adloff

et al.

- Eur.Phys.J.C 10 (1999) 363-372
•
e-Print:
- hep-ex/9810020
•
DOI:
- 10.1007/s100520050761

Inclusive transverse momentum distributions of charged particles in diffractive and nondiffractive photoproduction at HERA

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Z.Phys.C 67 (1995) 227-238,
- Preprint - Derrick, M. (94/07,rec.Aug.) 20 p
•
e-Print:
- hep-ex/9503014
•
DOI:
- 10.1007/BF01571283

Inclusive photoproduction of $\pi^0$ mesons at 6 GeV

Christoph Berger
(
- Aachen, Tech. Hochsch. and
- DESY
)
,
G. Dick
(
- Aachen, Tech. Hochsch. and
- DESY
)
,
W. Erlewein
(
- Aachen, Tech. Hochsch. and
- DESY
)
,
K. Luebelsmeyer
(
- Aachen, Tech. Hochsch. and
- DESY
)
,
L. Paul
(
- Aachen, Tech. Hochsch. and
- DESY
)

et al.

- Phys.Lett.B 47 (1973) 377-380
•
DOI:
- 10.1016/0370-2693(73)90629-1

INCLUSIVE pi0 PHOTOPRODUCTION AND THE QUARK - PARTON MODEL

et al.

- Phys.Lett.B 77 (1978) 233-239
•
DOI:
- 10.1016/0370-2693(78)90629-9

Inclusive $\pi^0$ Production in 250-{GeV}/ $c \pi^- p$ Interactions

- Phys.Rev.D 25 (1982) 41
•
DOI:
- 10.1103/PhysRevD.25.41

Production of $\pi^0$ mesons in muon - hydrogen interactions at 200-GeV

European Muon

Collaboration

•

J.J. Aubert

et al.

- Z.Phys.C 18 (1983) 189
•
DOI:
- 10.1007/BF01571359

Inclusive $\pi^0$ Production in 360-{GeV} $p p$ Interactions Using the European Hybrid Spectrometer

EHS-RCBC

Collaboration

•

J.L. Bailly
(
- UMH, Mons
)

et al.

- Z.Phys.C 22 (1984) 119
•
DOI:
- 10.1007/BF01572158

High-energy Photoproduction of Large Transverse Momentum $\pi^0$ Mesons: A Quantitative Test of {QCD}

NA14

Collaboration

•

E. Auge
(
- Orsay, LAL
)

et al.

- Phys.Lett.B 168 (1986) 163-169
•
DOI:
- 10.1016/0370-2693(86)91480-2

Inclusive $\pi^0$ and Eta0 Production in $\pi^- p$ Interactions at 360-{GeV}/ $c$

NA27 and
LEBC-EHS

Collaborations

•

M. Aguilar-Benitez

et al.

- Z.Phys.C 34 (1987) 419,
- Z. Phys. C34 ( 1987) 419-427 and CERN Geneva - CERN-EP 86-165 (86,REC.NOV.) 31p
•
DOI:
- 10.1007/BF01679860

Inclusive $\pi^0$ Production in $\pi^+ p$ , $K^+ p$ and $p p$ Interactions at 250-{GeV}/ $c$

NA22

Collaboration

•

I.V. Aiinenko
(
- Serpukhov, IHEP
)

et al.

- Z.Phys.C 35 (1987) 7,
- Yad.Fiz. 47 (1988) 429-438,
- Sov.J.Nucl.Phys. 47 (1988) 271-277,
- Yad. Fiz. 47 (1988) 429-438 and Serpukhov Inst. High Energy Phys. - 86-210 (86,rec.Jun.87) 20 p.
•
DOI:
- 10.1007/BF01561049