Leading-twist nuclear shadowing and suppression of hard coherent diffraction in proton-nucleus scattering

Journal Article · Sun Apr 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.045208· OSTI ID:20995233

Guzey, V; Strikman, M ^[1]

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1. Institut fuer Theoretische Physik II, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)

We use the Glauber-Gribov multiple scattering formalism and the theory of leading-twist nuclear shadowing to develop a method for the calculation of leading-twist hard coherent diffraction in hadron-nucleus processes. We demonstrate that soft multiple rescatterings lead to the factorization breaking of hard diffraction in proton-nucleus scattering, which is larger than that in hadron-nucleon scattering. For the kinematics encountered at the CERN Large Hadron Collider (LHC) and at the BNL Relativistic Heavy Ion Collider (RHIC), we compare the hard diffr-active to electromagnetic (e.m.) mechanisms of hard coherent production of two jets in proton-nucleus scattering. We study the x{sub IP},{beta}, and A dependence of the ratio of the dijet production cross sections due to the two effects, R, at the LHC and RHIC kinematics. We demonstrate that in proton-heavy nucleus hard coherent diffraction at the LHC, R is small, which offers a clean method to study hard photon-proton scattering at energies exceeding those available at the DESY Hadron Electron Ring Accelerator (HERA) by a factor of ten. In contrast, the use of lighter nuclei, such as {sup 40}Ca, allows the study of the screened nuclear diffractive parton distribution. Moreover, a comparison of the dijet diffractive production to the heavy-quark-jet diffractive production will estimate the scree-ned nuclear diffractive gluon PDF, which will be measured in nucleus-nucleus ultraperipheral collisions at the LHC.

• OSTI ID: 20995233
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
B QUARKS
BNL
BROOKHAVEN RHIC
C QUARKS
CALCIUM 40
CERN LHC
COHERENT PRODUCTION
COMPARATIVE EVALUATIONS
DESY
DIFFRACTION
ELECTRON-RING ACCELERATORS
HEAVY NUCLEI
HERA STORAGE RING
MULTIPLE SCATTERING
PHOTON-PROTON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTONS
RESCATTERING
T QUARKS