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Title: Generalized parton distributions and rapidity gap survival in exclusive diffractive pp scattering

Abstract

We propose a new approach to the problem of rapidity gap survival (RGS) in the production of high-mass systems (H = dijet, heavy quarkonium, Higgs boson) in double-gap exclusive diffractive pp scattering, pp-->p + (gap) + H + (gap) + p. It is based on the idea that hard and soft interactions proceed over widely different time- and distance scales and are thus approximately independent. The high-mass system is produced in a hard scattering process with exchange of two gluons between the protons. Its amplitude is calculable in terms of the gluon generalized parton distributions (GPDs) in the protons, which can be measured in J= production in exclusive ep scattering. The hard scattering process is modified by soft spectator interactions, which we calculate in a model-independent way in terms of the pp elastic scattering amplitude. Contributions from inelastic intermediate states are suppressed. A simple geometric picture of the interplay of hard and soft interactions in diffraction is obtained. The onset of the black-disk limit in pp scattering at TeV energies strongly suppresses diffraction at small impact parameters and is the main factor in determining the RGS probability. Correlations between hard and soft interactions (e.g. due to scattering from the long-rangemore » pion field of the proton, or due to possible short-range transverse correlations between partons) further decrease the RGS probability. We also investigate the dependence of the diffractive cross section on the transverse momenta of the final-state protons (''diffraction pattern''). By measuring this dependence one can perform detailed tests of the interplay of hard and soft interactions, and even extract information about the gluon GPD in the proton. Such studies appear to be feasible with the planned forward detectors at the LHC.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
890536
Report Number(s):
JLAB-THY-06-533; DOE/ER/40150-4012
TRN: US0604601
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article
Journal Name:
Phys.Rev.D
Additional Journal Information:
Journal Volume: 75
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; CROSS SECTIONS; DIFFRACTION; ELASTIC SCATTERING; GLUONS; HIGGS BOSONS; IMPACT PARAMETER; PARTICLE RAPIDITY; PIONS; PROBABILITY; PRODUCTION; PROTONS; QUARKONIUM; SCATTERING

Citation Formats

Leonid Frankfurt, Charles Hyde-Wright, Mark Strikman, and Christian Weiss. Generalized parton distributions and rapidity gap survival in exclusive diffractive pp scattering. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.75.054009.
Leonid Frankfurt, Charles Hyde-Wright, Mark Strikman, & Christian Weiss. Generalized parton distributions and rapidity gap survival in exclusive diffractive pp scattering. United States. doi:10.1103/PhysRevD.75.054009.
Leonid Frankfurt, Charles Hyde-Wright, Mark Strikman, and Christian Weiss. Thu . "Generalized parton distributions and rapidity gap survival in exclusive diffractive pp scattering". United States. doi:10.1103/PhysRevD.75.054009. https://www.osti.gov/servlets/purl/890536.
@article{osti_890536,
title = {Generalized parton distributions and rapidity gap survival in exclusive diffractive pp scattering},
author = {Leonid Frankfurt and Charles Hyde-Wright and Mark Strikman and Christian Weiss},
abstractNote = {We propose a new approach to the problem of rapidity gap survival (RGS) in the production of high-mass systems (H = dijet, heavy quarkonium, Higgs boson) in double-gap exclusive diffractive pp scattering, pp-->p + (gap) + H + (gap) + p. It is based on the idea that hard and soft interactions proceed over widely different time- and distance scales and are thus approximately independent. The high-mass system is produced in a hard scattering process with exchange of two gluons between the protons. Its amplitude is calculable in terms of the gluon generalized parton distributions (GPDs) in the protons, which can be measured in J= production in exclusive ep scattering. The hard scattering process is modified by soft spectator interactions, which we calculate in a model-independent way in terms of the pp elastic scattering amplitude. Contributions from inelastic intermediate states are suppressed. A simple geometric picture of the interplay of hard and soft interactions in diffraction is obtained. The onset of the black-disk limit in pp scattering at TeV energies strongly suppresses diffraction at small impact parameters and is the main factor in determining the RGS probability. Correlations between hard and soft interactions (e.g. due to scattering from the long-range pion field of the proton, or due to possible short-range transverse correlations between partons) further decrease the RGS probability. We also investigate the dependence of the diffractive cross section on the transverse momenta of the final-state protons (''diffraction pattern''). By measuring this dependence one can perform detailed tests of the interplay of hard and soft interactions, and even extract information about the gluon GPD in the proton. Such studies appear to be feasible with the planned forward detectors at the LHC.},
doi = {10.1103/PhysRevD.75.054009},
journal = {Phys.Rev.D},
number = ,
volume = 75,
place = {United States},
year = {2007},
month = {3}
}