Charm content of a photon and J / psi photoproduction at high-energies

photoproduction on proton at high energies is presented. Our calculations are based on perturbative QCD and non-relativistic quark model. It is shown that at HERA energy the resolved-photon contribution via partonic subprocess

cg\to J/\psi c

in the total inclusive

J/\psi

photoproduction cross-section is not negligible as compare with the dominant photon-gluon fusion contribution and it is high over the resolved-photon contribution via subprocess

gg\to J/\psi g

. We find that the resolved-photon contribution via subprocess

cg\to J/\psi c

in

J/\psi

plus open charm associated photoproduction dominates over the direct photon-gluon fusion contribution via subprocess

\gamma g\to J/\psi c\bar c

.

Note:

LaTeX, 8 pages, 5 figs not included (available via mail on request)

photon p: inclusive reaction
photon: structure function
quark: charm
quark: associated production
associated production: quark
quantum chromodynamics: perturbation theory
quark: nonrelativistic
fusion: photon gluon
model: parton
Feynman graph: higher-order

References(15)

Figures(0)

Muoproduction of $J/\psi$ and the Photon - Gluon Scattering Process: $\gamma^* g \to J/\psi g$

R. Baier
(
- Orsay, LPT
)
,
R. Ruckl
(
- Munich, Max Planck Inst.
)

- Nucl.Phys.B 218 (1983) 289-296
•
DOI:
- 10.1016/0550-3213(83)90365-6

Algebraic realisations of chiral su(3) x su(3) symmetry

Anthony Sudbery
(
- Glasgow U.
)

- Nucl.Phys.B 20 (1970) 1-13
•
DOI:
- 10.1016/0550-3213(70)90192-6

Inelastic Photoproduction of J/psi and Upsilon by Gluons

Edmond L. Berger
(
- Argonne
)
,
Daniel L. Jones
(
- Argonne
)

- Phys.Rev.D 23 (1981) 1521-1530
•
DOI:
- 10.1103/PhysRevD.23.1521

Inelastic Leptoproduction of $J/\psi$ as a Probe of the Small X Behavior of the Gluon Structure Function

- Phys.Lett.B 191 (1987) 200
•
DOI:
- 10.1016/0370-2693(87)91347-5

- Int.J.Mod.Phys.A 32 7955

Anomalous Cross-Section for Photon - Photon Scattering in Gauge Theories

Edward Witten
(
- Princeton U.
)

- Nucl.Phys.B 120 (1977) 189-202
•
DOI:
- 10.1016/0550-3213(77)90038-4

Photon-Photon Reactions

Christoph Berger
(
- Aachen, Tech. Hochsch.
)
,
W. Wagner
(
- UC, Davis
)

- Phys.Rept. 146 (1987) 1-134
•
DOI:
- 10.1016/0370-1573(87)90012-3

Review of particle properties. Particle Data Group

et al.

- Phys.Rev.D 45 (1992) S1,
- Phys.Rev.D 46 (1992) 5210 (erratum)
•
DOI:
- 10.1103/PhysRevD.45.S1

The hadronic properties of the photon in gamma p interactions

Gerhard A. Schuler
(
- CERN
)
,
Torbjorn Sjostrand
(
- CERN
)

- Phys.Lett.B 300 (1993) 169-174
•
DOI:
- 10.1016/0370-2693(93)90766-B

Parametrizations of the Photon Structure and Applications to Supersymmetric Particle Production at HERA

Manuel Drees
(
- Dortmund U.
)
,
K. Grassie
(
- Dortmund U.
)

- Z.Phys.C 28 (1985) 451
•
DOI:
- 10.1007/BF01413608

Parton structure of the photon beyond the leading order

- Phys.Rev.D 45 (1992) 3986-3994
•
DOI:
- 10.1103/PhysRevD.45.3986

Photonic parton distributions

- Phys.Rev.D 46 (1992) 1973-1979
•
DOI:
- 10.1103/PhysRevD.46.1973

- Yad.Fiz. 38 1240

Z0 decay into charmonium via charm quark fragmentation

- Phys.Rev.D 48 (1993) 4230-4235
•
e-Print:
- hep-ph/9302307
•
DOI:
- 10.1103/PhysRevD.48.4230

Production of four heavy quarks and B(c) mesons at the Z0 boson pole

- Phys.Atom.Nucl. 57 (1994) 689-699,
- Yad.Fiz. 57 (1994) 733-744,
- Phys. At. Nucl. 57 (1994) 689-699. (Yad. Fiz. 57 (1994) 733-744). and Serpukhov Inst. High Energy Phys. - 93-058 (93/04,rec.Apr.94) 20 p. (409185)
•
e-Print:
- hep-ph/9401348