skip to main content
Show search Show menu
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Deeply virtual Compton scattering at 6 GeV

Abstract

The authors propose a measurement of the Deep Virtual Compton Scattering process (DVCS) ep {yields} ep{gamma} in Hall A at Jefferson Lab with a 6 GeV beam. The authors are able to explore the onset of Q{sup 2} scaling, by measuring a beam helicity asymmetry for Q{sup 2} ranging from 1.5 to 2.5 GeV{sup 2} at x{sub B} {approx} 0.35. At this kinematics, the asymmetry is dominated by the DVCS Bethe-Heitler (BH) interference, which is proportional to the imaginary part of the DVCS amplitude amplified by the full magnitude of the BH amplitude. The imaginary part of the DVCS amplitude is expected to scale early. Indeed, the imaginary part of the forward Compton amplitude measured in deep inelastic scattering (via the optical theorem) scales at Q{sup 2} as low as 1 GeV{sup 2}. If the scaling regime is reached, they make an 8% measurement of the skewed parton distributions (SPD) contributing to the DVCS amplitude. Also, this experiment allows them to separately estimate the size of the higher-twist effects, since they are only suppressed by an additional factor 1/Q compared to the leading-twist term, and have a different angular dependence. They use a polarized electron beam and detect the scatteredmore » electron in the HRSe, the real photon in an electromagnetic calorimeter (under construction) and the recoil proton in a shielded scintillator array (to be constructed). This allows them to determine the difference in cross-sections for electrons of opposite helicities. This observable is directly linked to the SPD's. The authors estimate that 25 days of beam (600 hours) are needed to achieve this goal.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
835025
Report Number(s):
JLAB-PHY-00-79; DOE/ER/40150-3033
TRN: US0407424
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Journal Article
Resource Relation:
Other Information: No journal information given for this preprint; PBD: 1 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ASYMMETRY; CALORIMETERS; COMPTON EFFECT; CONSTRUCTION; CROSS SECTIONS; DEEP INELASTIC SCATTERING; ELECTRON BEAMS; ELECTRONS; HELICITY; OPTICAL THEOREM; PARTONS; PHOSPHORS; PHOTONS; PROTONS

Citation Formats

Chen, Jian-ping, Chudakov, Eugene, Jager, Cornelis De, Gomez, Javier, Hansen, Jens-ole, Lerose, John, Michaels, Robert, Mitchell, Joseph, Saha, Arunava, Wojtsekhowski, Bogdan, Berthot, J, Bertin, Pierre, Deur, Alexandre, Salvo, Rachele Di, Weinstein, Lawrence, Boeglin, Werner, Markowitz, Pete, Templon, Jeffrey, Gueye, Paul, Chang, Ting, Nathan, Alan, Leo, Raffaele De, Lagamba, Luigi, Amarian, Moskov, Cisbani, Evaristo, Frullani, Salvatore, Garibaldi, Franco, Iommi, R, Iodice, Mauro, Urciuoli, Guido, Vanderhaeghen, Marc, Higinbotham, Douglas, Jiang, Xiaodong, Guichon, Pierre, Roblin, Yves, Dodge, Gail, Jutier, Christophe, Hyde-wright, Charles, Sabatie, Franck, Todor, Luminita, and Ulmer, Paul. Deeply virtual Compton scattering at 6 GeV. United States: N. p., 2000. Web.
Copy to clipboard
Chen, Jian-ping, Chudakov, Eugene, Jager, Cornelis De, Gomez, Javier, Hansen, Jens-ole, Lerose, John, Michaels, Robert, Mitchell, Joseph, Saha, Arunava, Wojtsekhowski, Bogdan, Berthot, J, Bertin, Pierre, Deur, Alexandre, Salvo, Rachele Di, Weinstein, Lawrence, Boeglin, Werner, Markowitz, Pete, Templon, Jeffrey, Gueye, Paul, Chang, Ting, Nathan, Alan, Leo, Raffaele De, Lagamba, Luigi, Amarian, Moskov, Cisbani, Evaristo, Frullani, Salvatore, Garibaldi, Franco, Iommi, R, Iodice, Mauro, Urciuoli, Guido, Vanderhaeghen, Marc, Higinbotham, Douglas, Jiang, Xiaodong, Guichon, Pierre, Roblin, Yves, Dodge, Gail, Jutier, Christophe, Hyde-wright, Charles, Sabatie, Franck, Todor, Luminita, & Ulmer, Paul. Deeply virtual Compton scattering at 6 GeV. United States.
Copy to clipboard
Chen, Jian-ping, Chudakov, Eugene, Jager, Cornelis De, Gomez, Javier, Hansen, Jens-ole, Lerose, John, Michaels, Robert, Mitchell, Joseph, Saha, Arunava, Wojtsekhowski, Bogdan, Berthot, J, Bertin, Pierre, Deur, Alexandre, Salvo, Rachele Di, Weinstein, Lawrence, Boeglin, Werner, Markowitz, Pete, Templon, Jeffrey, Gueye, Paul, Chang, Ting, Nathan, Alan, Leo, Raffaele De, Lagamba, Luigi, Amarian, Moskov, Cisbani, Evaristo, Frullani, Salvatore, Garibaldi, Franco, Iommi, R, Iodice, Mauro, Urciuoli, Guido, Vanderhaeghen, Marc, Higinbotham, Douglas, Jiang, Xiaodong, Guichon, Pierre, Roblin, Yves, Dodge, Gail, Jutier, Christophe, Hyde-wright, Charles, Sabatie, Franck, Todor, Luminita, and Ulmer, Paul. 2000. "Deeply virtual Compton scattering at 6 GeV". United States. https://www.osti.gov/servlets/purl/835025.
Copy to clipboard
@article{osti_835025,
title = {Deeply virtual Compton scattering at 6 GeV},
author = {Chen, Jian-ping and Chudakov, Eugene and Jager, Cornelis De and Gomez, Javier and Hansen, Jens-ole and Lerose, John and Michaels, Robert and Mitchell, Joseph and Saha, Arunava and Wojtsekhowski, Bogdan and Berthot, J and Bertin, Pierre and Deur, Alexandre and Salvo, Rachele Di and Weinstein, Lawrence and Boeglin, Werner and Markowitz, Pete and Templon, Jeffrey and Gueye, Paul and Chang, Ting and Nathan, Alan and Leo, Raffaele De and Lagamba, Luigi and Amarian, Moskov and Cisbani, Evaristo and Frullani, Salvatore and Garibaldi, Franco and Iommi, R and Iodice, Mauro and Urciuoli, Guido and Vanderhaeghen, Marc and Higinbotham, Douglas and Jiang, Xiaodong and Guichon, Pierre and Roblin, Yves and Dodge, Gail and Jutier, Christophe and Hyde-wright, Charles and Sabatie, Franck and Todor, Luminita and Ulmer, Paul},
abstractNote = {The authors propose a measurement of the Deep Virtual Compton Scattering process (DVCS) ep {yields} ep{gamma} in Hall A at Jefferson Lab with a 6 GeV beam. The authors are able to explore the onset of Q{sup 2} scaling, by measuring a beam helicity asymmetry for Q{sup 2} ranging from 1.5 to 2.5 GeV{sup 2} at x{sub B} {approx} 0.35. At this kinematics, the asymmetry is dominated by the DVCS Bethe-Heitler (BH) interference, which is proportional to the imaginary part of the DVCS amplitude amplified by the full magnitude of the BH amplitude. The imaginary part of the DVCS amplitude is expected to scale early. Indeed, the imaginary part of the forward Compton amplitude measured in deep inelastic scattering (via the optical theorem) scales at Q{sup 2} as low as 1 GeV{sup 2}. If the scaling regime is reached, they make an 8% measurement of the skewed parton distributions (SPD) contributing to the DVCS amplitude. Also, this experiment allows them to separately estimate the size of the higher-twist effects, since they are only suppressed by an additional factor 1/Q compared to the leading-twist term, and have a different angular dependence. They use a polarized electron beam and detect the scattered electron in the HRSe, the real photon in an electromagnetic calorimeter (under construction) and the recoil proton in a shielded scintillator array (to be constructed). This allows them to determine the difference in cross-sections for electrons of opposite helicities. This observable is directly linked to the SPD's. The authors estimate that 25 days of beam (600 hours) are needed to achieve this goal.},
doi = {},
url = {https://www.osti.gov/biblio/835025}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2000},
month = {Thu Jun 01 00:00:00 EDT 2000}
}
Copy to clipboard
Journal Article:
View Journal Article
Other availability
Find in Google Scholar Find in Google Scholar
Search WorldCat Search WorldCat to find libraries that may hold this journal
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

Similar records in OSTI.GOV collections: