Diffractive Photoproduction of Jets with a Direct Pomeron Coupling at HERA

نویسندگان

  • B A Kniehl
  • G Kohrs
  • G Kramer
چکیده

We investigate in detail the effect of a direct pomeron coupling to quarks on the production of jets in ep scattering with almost real photons. Jet production via a direct pomeron coupling is compared with the resolved–pomeron mechanism. We consider both direct and resolved photoproduction. Rapidity and transverse momentum distributions are calculated and compared with preliminary H1 and ZEUS data. Present Address: KEK Theory Group, 1–1 Oho, Ibaraki–ken, Tsukuba 305, Japan; address after 1 October 1994: Max–Planck–Institut für Physik, Föhringer Ring 6, 80805 Munich, Germany. Supported by Japan Society for the Promotion of Science (JSPS) through Fellowship No. S94159. Supported by Deutsche Forschungsgemeinschaft (DFG) through Graduiertenkolleg. Supported by Bundesministerium für Forschung und Technologie (BMFT), Bonn, Germany, under Contract 05 6 HH 93P (5) and by EEC Program Human Capital and Mobility through Network Physics at High Energy Colliders under Contract CHRX–CT93–0357 (DG12 COMA).

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Jet asymmetry in high energy diffractive production ∗

We propose the asymmetry in the fractional energy of charm versus anticharm jets produced in high energy diffractive photoproduction as a sensitive test of the interference of the Odderon (C = −) and Pomeron (C = +) exchange amplitudes in QCD. If measured at HERA, this asymmetry could provide the first experimental evidence of the Odderon.

متن کامل

Hard Photoproduction at HERA

In view of possible photoproduction studies in ultraperipheral heavy-ion collisions at the LHC, we briefly review the present theoretical understanding of photons and hard photoproduction processes at HERA, discussing the production of jets, light and heavy hadrons, quarkonia, and prompt photons. We address in particular the extraction of the strong coupling constant from photon structure funct...

متن کامل

Quark-Antiquark Production in DIS Diffractive Dissociation

We calculate the cross section for the production of two jets with large transverse momenta k in DIS diffractive dissociation for both transverse and longitudinally polarized photons. The scale which defines the hardness of the Pomeron is found to be k Q 2 +M M . We present analytic expressions and discuss numerical results relevant for the diffractive dissociation at HERA. 1.) The diffractive ...

متن کامل

Diffractive charm photoproduction at HERA ep - collider

The cross section of the D *-meson diffractive photoproduction at the HERA collider has been calculated in the framework of perturbatively motivated model for the different kine-matic regions. The camparison between the different Pomeron models has been performed.

متن کامل

Diffractive Photoproduction of Heavy Vector Mesons

Diffractive vector meson production is described on the one hand within the phenomenological framework based on Regge theory, and on the other hand by perturbative QCD calculations. Light vector mesons in the photoproduction regime (where no hard scale is present) agree well with non-perturbative Regge based descriptions. Perturbative effects are measured in the presence of a hard scale for lig...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1994