skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Virtual Compton scattering measurements in the nucleon resonance region

Abstract

We report on new measurements of the electric Generalized Polarizability (GP) of the proton \( \alpha_{E}\) in a kinematic region where a puzzling dependence on momentum transfer has been observed, and we have found that \( \alpha_E = (5.3 \pm 0.6_{stat} \pm 1.3_{sys}) 10^{-4}\) fm3 at \( Q^{2}=0.20\) (GeV/c)2. The new measurements, when considered along with the rest of the world data, suggest that \( \alpha_E\) can be described by either a local plateau or by an enhancement in the region \( Q^2=0.20\) (GeV/c)2 to 0.33 (GeV/c)2. The experiment also provides the first measurement of the Coulomb quadrupole amplitude in the \( N \rightarrow \Delta\) transition through the exploration of the \( p(e,e'p)\gamma\) reaction. The new measurement gives \( CMR = (-4.4 \pm 0.8_{stat} \pm 0.6_{sys})\%\) at \( Q^2=0.20\) (GeV/c)2 and is consistent with the results from the pion electroproduction world data. It has been obtained using a completely different extraction method, and therefore represents a strong validation test of the world data model uncertainties.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [2];  [2];  [2];  [2];  [1];  [3];  [2];  [2];  [2];  [2];  [1];  [4];  [2] more »;  [1];  [5];  [2];  [2];  [2];  [2];  [6];  [2] « less
  1. Temple Univ., Philadelphia, PA (United States)
  2. Johannes Gutenberg Univ., Mainz (Germany)
  3. Clermont Univ., Clermont-Ferrand (France)
  4. Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
  5. Univ. of Pavia (Italy)
  6. Jozef Stefan Inst. (IJS), Ljubljana (Slovenia); Univ. of Ljubljana (Slovenia)
Publication Date:
Research Org.:
Temple Univ., Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); German Research Foundation (DFG)
OSTI Identifier:
1596686
Grant/Contract Number:  
SC0016577
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 55; Journal Issue: 10; Related Information: Adam Blomberg, PhD Thesis, Temple University, Dept. of Physics (2016); Journal ID: ISSN 1434-6001
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; proton; polarizabilities

Citation Formats

Blomberg, A., Atac, H., Sparveris, Nikolaos, Paolone, M., Achenbach, P., Benali, M., Beričič, J., Böhm, R., Correa, L., Distler, M. O., Esser, A., Flay, D., Fonvieille, H., Friščić, I., Kohl, Y., Merkel, H., Müller, U., Meziani, Z. E., Mihovilovic, M., Pochodzalla, J., Polychronopoulou, A., Pasquini, B., Schoth, M., Schulz, F., Schlimme, S., Sfienti, C., Sirca, S., and Weber, A. Virtual Compton scattering measurements in the nucleon resonance region. United States: N. p., 2019. Web. https://doi.org/10.1140/epja/i2019-12877-0.
Blomberg, A., Atac, H., Sparveris, Nikolaos, Paolone, M., Achenbach, P., Benali, M., Beričič, J., Böhm, R., Correa, L., Distler, M. O., Esser, A., Flay, D., Fonvieille, H., Friščić, I., Kohl, Y., Merkel, H., Müller, U., Meziani, Z. E., Mihovilovic, M., Pochodzalla, J., Polychronopoulou, A., Pasquini, B., Schoth, M., Schulz, F., Schlimme, S., Sfienti, C., Sirca, S., & Weber, A. Virtual Compton scattering measurements in the nucleon resonance region. United States. https://doi.org/10.1140/epja/i2019-12877-0
Blomberg, A., Atac, H., Sparveris, Nikolaos, Paolone, M., Achenbach, P., Benali, M., Beričič, J., Böhm, R., Correa, L., Distler, M. O., Esser, A., Flay, D., Fonvieille, H., Friščić, I., Kohl, Y., Merkel, H., Müller, U., Meziani, Z. E., Mihovilovic, M., Pochodzalla, J., Polychronopoulou, A., Pasquini, B., Schoth, M., Schulz, F., Schlimme, S., Sfienti, C., Sirca, S., and Weber, A. Tue . "Virtual Compton scattering measurements in the nucleon resonance region". United States. https://doi.org/10.1140/epja/i2019-12877-0. https://www.osti.gov/servlets/purl/1596686.
@article{osti_1596686,
title = {Virtual Compton scattering measurements in the nucleon resonance region},
author = {Blomberg, A. and Atac, H. and Sparveris, Nikolaos and Paolone, M. and Achenbach, P. and Benali, M. and Beričič, J. and Böhm, R. and Correa, L. and Distler, M. O. and Esser, A. and Flay, D. and Fonvieille, H. and Friščić, I. and Kohl, Y. and Merkel, H. and Müller, U. and Meziani, Z. E. and Mihovilovic, M. and Pochodzalla, J. and Polychronopoulou, A. and Pasquini, B. and Schoth, M. and Schulz, F. and Schlimme, S. and Sfienti, C. and Sirca, S. and Weber, A.},
abstractNote = {We report on new measurements of the electric Generalized Polarizability (GP) of the proton \( \alpha_{E}\) in a kinematic region where a puzzling dependence on momentum transfer has been observed, and we have found that \( \alpha_E = (5.3 \pm 0.6_{stat} \pm 1.3_{sys}) 10^{-4}\) fm3 at \( Q^{2}=0.20\) (GeV/c)2. The new measurements, when considered along with the rest of the world data, suggest that \( \alpha_E\) can be described by either a local plateau or by an enhancement in the region \( Q^2=0.20\) (GeV/c)2 to 0.33 (GeV/c)2. The experiment also provides the first measurement of the Coulomb quadrupole amplitude in the \( N \rightarrow \Delta\) transition through the exploration of the \( p(e,e'p)\gamma\) reaction. The new measurement gives \( CMR = (-4.4 \pm 0.8_{stat} \pm 0.6_{sys})\%\) at \( Q^2=0.20\) (GeV/c)2 and is consistent with the results from the pion electroproduction world data. It has been obtained using a completely different extraction method, and therefore represents a strong validation test of the world data model uncertainties.},
doi = {10.1140/epja/i2019-12877-0},
journal = {European Physical Journal. A},
number = 10,
volume = 55,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Nucleon polarizabilities: From Compton scattering to hydrogen atom
journal, May 2016

  • Hagelstein, Franziska; Miskimen, Rory; Pascalutsa, Vladimir
  • Progress in Particle and Nuclear Physics, Vol. 88
  • DOI: 10.1016/j.ppnp.2015.12.001

Virtual Compton scattering off the nucleon
journal, January 1998


Light-Front Interpretation of Proton Generalized Polarizabilities
journal, March 2010


Virtual compton scattering and generalized polarizabilities of the proton
journal, September 1995


Structure analysis of the virtual Compton scattering amplitude at low energies
journal, February 1998


Low-energy and low-momentum representation of the virtual Compton scattering amplitude
journal, September 1998


Low-energy Compton scattering and the polarizabilities of the proton
journal, April 2001

  • Olmos de León, V.; Wissmann, F.; Achenbach, P.
  • The European Physical Journal A, Vol. 10, Issue 2
  • DOI: 10.1007/s100500170132

Polarizability of the nucleon and Compton scattering
journal, October 2005


Dispersion theory of nucleon Compton scattering and polarizabilities
journal, April 2013


Dispersion relation formalism for virtual Compton scattering off the proton
journal, July 2001

  • Pasquini, B.; Gorchtein, M.; Drechsel, D.
  • The European Physical Journal A, Vol. 11, Issue 2
  • DOI: 10.1007/s100500170084

Dispersion relations in real and virtual Compton scattering
journal, May 2003


Dispersion Theory in Electromagnetic Interactions
journal, October 2018


Virtual Compton scattering measurements in the γ * N Δ transition
journal, July 2008


Overview: The Shape of Hadrons
conference, January 2007

  • Bernstein, A. M.; Papanicolas, C. N.
  • SHAPES OF HADRONS, AIP Conference Proceedings
  • DOI: 10.1063/1.2734399

First Determination of Generalized Polarizabilities of the Proton by a Virtual Compton Scattering Experiment
journal, July 2000


A new measurement of the structure functions PLL - PTT/ε and PLT in virtual Compton scattering at Q2 = 0.33 (GeV/c)2
journal, July 2008


The three-spectrometer facility at the Mainz microtron MAMI
journal, February 1998

  • Blomqvist, K. I.; Boeglin, W. U.; Böhm, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 403, Issue 2-3
  • DOI: 10.1016/S0168-9002(97)01133-9

QED radiative corrections to virtual Compton scattering
journal, July 2000


Virtual Compton scattering and the generalized polarizabilities of the proton at Q 2 = 0.92 and 1.76 GeV 2
journal, July 2012


Determination of quadrupole strengths in the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>γ</mml:mi><mml:mo>∗</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="normal">Δ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1232</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> transition at <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>=</mml:mo><mml:mn>0.20</mml:mn><mml:mspace width="0.25em"/><mml:msup><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mtext>GeV</mml:mtext><mml:mo stretchy="false">/</mml:mo><mml:mi>c</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msup></mml:math>
journal, July 2007


Virtual Compton scattering at low energy and the generalized polarizabilities of the nucleon
journal, July 2005


Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering at Q 2 = 0.92 and 1.76 G e V 2
journal, September 2004


Generalized polarizabilities of the nucleon in baryon chiral perturbation theory
journal, February 2017


Generalized polarizabilities of the nucleon in chiral effective theories
journal, May 2000


Generalized polarizabilities of the proton in a constituent quark model revisited
journal, January 2001


Nucleon polarizabilities in virtual Compton scattering
journal, August 1998


Generalized polarizabilities of the nucleon studied in the linear sigma model
journal, December 1996

  • Metz, A.; Drechsel, D.
  • Zeitschrift für Physik A: Hadrons and Nuclei, Vol. 356, Issue 1
  • DOI: 10.1007/BF02769238

Measurement of the Recoil Polarization in the p ( e , e p ) π 0 Reaction at the Δ ( 1232 ) Resonance
journal, April 2001


Investigation of the Conjectured Nucleon Deformation at Low Momentum Transfer
journal, January 2005


Lowest- Q2 measurement of the γp → Δ reaction: Probing the pionic contribution
journal, December 2006


Measurement of the LT-asymmetry in πelectroproduction at the energy of the Δ(1232)-resonance
journal, January 2006


Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
journal, November 2009


Electroexcitation of the Δ + (1232) at low momentum transfer
journal, September 2016


Measurements of the γ*p → Δ reaction at low Q2
journal, October 2013


Dynamical study of the Δ excitation in N ( e , e π ) reactions
journal, March 2001


Large- N c relations for the electromagnetic nucleon-to- Δ form factors
journal, December 2007


Nucleon and $${\Delta}$$ Δ Elastic and Transition Form Factors
journal, October 2014


π0 Photo- and electroproduction at threshold within a dynamical model
journal, December 2001


A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
journal, January 1999


Pion Cloud and the Q 2 Dependence of γ * N Δ Transition Form Factors
journal, November 1999


Analysis of pion photoproduction data
journal, November 2002


E 1 + M 1 + and S 1 + M 1 + and their Q 2 dependence in γ v N Δ with relativized quark-model wave functions
journal, May 1990


Electromagnetic form factors in the Hypercentral Constituent Quark Model
journal, June 2005


N -to- Δ Electromagnetic-Transition Form Factors from Lattice QCD
journal, January 2005


The role of the pion cloud in electroproduction of the Δ(1232)
journal, April 1996


Chiral effective-field theory in the Δ ( 1232 ) region: Pion electroproduction on the nucleon
journal, February 2006


Signatures of chiral dynamics in the nucleon to Delta transition⋆
journal, April 2006


    Works referencing / citing this record:

    New Insight in the Q 2 Dependence of Proton Generalized Polarizabilities
    journal, November 2019