Observation of hard processes in rapidity gap events in gamma p interactions at HERA

Events with no hadronic energy flow in a large interval of pseudo-rapidity in the proton direction are observed in photon-proton interactions at an average centre of mass energy 〈√s γp 〉 of 200 GeV These events are interpreted as photon diffractive dissociation. Evidence for hard scattering in photon diffractive dissociation is demonstrated using inclusive single particle spectra, thrust as a function of transverse energy, and the observation of jet production. The data can be described by a Monte Carlo calculation including hard photon-pomeron scattering.

electron p: colliding beams
colliding beams: electron p
exchange: one-photon
one-photon: exchange
photon p: inclusive reaction
rapidity spectrum: gap
diffraction: dissociation
hard scattering
jet: photoproduction
photoproduction: jet

References(26)

Figures(0)

Hard scattering in gamma p interactions

H1

Collaboration

•

T. Ahmed
(
- Birmingham U.
)

et al.

- Phys.Lett.B 297 (1992) 205-213
•
DOI:
- 10.1016/0370-2693(92)91094-P

Measurement of inclusive jet cross-sections in photoproduction at HERA

H1

Collaboration

•

I. Abt

et al.

- Phys.Lett.B 314 (1993) 436-444
•
DOI:
- 10.1016/0370-2693(93)91263-M

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

Observation of hard scattering in photoproduction at HERA

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Phys.Lett.B 297 (1992) 404-416
•
DOI:
- 10.1016/0370-2693(92)91280-M

Observation of direct processes in photoproduction at HERA

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Phys.Lett.B 322 (1994) 287-300
•
DOI:
- 10.1016/0370-2693(94)91121-5

Inclusive jet differential cross-sections in photoproduction at HERA

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Phys.Lett.B 342 (1995) 417-432
•
DOI:
- 10.1016/0370-2693(94)01510-J

Total photoproduction cross-section measurement at HERA energies

H1

Collaboration

•

T. Ahmed

et al.

- Phys.Lett.B 299 (1993) 374-384
•
DOI:
- 10.1016/0370-2693(93)90277-O

Diffractive Interactions of Hadrons at High-Energies

Konstantin A. Goulianos
(
- Rockefeller U.
)

- Phys.Rept. 101 (1983) 169
•
DOI:
- 10.1016/0370-1573(83)90010-8

Theory of high-energy scattering and multiple production

- Nuovo Cim. 26 (1962) 896-954
•
DOI:
- 10.1007/BF02781901

A Model of the Bare Pomeron

F.E. Low
(
- MIT, LNS
)

- Phys.Rev.D 12 (1975) 163-173
•
DOI:
- 10.1103/PhysRevD.12.163

Colored Quark Version of Some Hadronic Puzzles

S. Nussinov
(
- Tel Aviv U.
)

- Phys.Rev.Lett. 34 (1975) 1286-1289,
- In *Caneschi, L. (ed.): Regge theory of low-p(T) hadronic interactions* 347-350. (Phys. Rev. Lett. 34 (1975) 1286-1289). (see Book Index)
•
DOI:
- 10.1103/PhysRevLett.34.1286