Related papers: First Measurement of pi e -> pi e gamma Pion Virtu…

Virtual Compton scattering at low energies with a positron beam

The Virtual Compton scattering (VCS) process at low energies explores the electromagnetic structure of the proton in terms of generalized polarizabilities (GPs). In the one-photon exchange approximation, VCS can be accessed with exclusive…

High Energy Physics - Phenomenology · Physics 2021-12-08 B. Pasquini , M. Vanderhaeghen

Measurement of the transverse target-spin asymmetry associated with deeply virtual Compton scattering on the proton

Measurements of deeply virtual Compton scattering (DVCS) made at HERMES using 27.6 GeV $e^\pm$ beams and various internal polarized or unpolarized gaseous targets are discussed. Results are reported on the transverse target-spin asymmetry…

High Energy Physics - Experiment · Physics 2007-05-23 Zhenyu Ye

Pion Generalized Dipole Polarizabilities by Virtual Compton Scattering $\pi e \to \pi e\gamma$

We present a calculation of the cross section and the event generator of the reaction $\pi e\to \pi e \gamma$. This reaction is sensitive to the pion generalized dipole polarizabilities, namely, the longitudinal electric $\alpha_L(q^2)$,…

High Energy Physics - Phenomenology · Physics 2009-11-07 C. Unkmeir , A. Ocherashvili , T. Fuchs , M. A. Moinester , S. Scherer

Deeply Virtual Compton Scattering at HERA II

A new measurement is presented of elastic deeply virtual Compton scattering (DVCS) based on data taken by the H1 detector during the complete HERA II period. The data are well described by QCD based calculations. For the first time, a beam…

High Energy Physics - Phenomenology · Physics 2007-05-23 Laurent Schoeffel

A new measurement of the structure functions $P_{LL}-P_{TT}/epsilon$ and $P_{LT}$ in virtual Compton scattering at $Q^2=$ 0.33 (GeV/c)$^2$

The cross section of the $ep \to e' p' \gamma$ reaction has been measured at $Q^2 = 0.33$ (GeV/c)$^2$. The experiment was performed using the electron beam of the MAMI accelerator and the standard detector setup of the A1 Collaboration. The…

Nuclear Experiment · Physics 2012-08-27 A1 Collaboration , P. Janssens , L. Doria , P. Achenbach , C. Ayerbe Gayoso , D. Baumann , J. C. Bernauer , I. K. Bensafa , R. Böhm , D. Bosnar , E. Burtin , N. D'Hose , X. Defaÿ , M. Ding , M. O. Distler , H. Fonvieille , J. Friedrich , J. M. Friedrich , G. Laveissière , M. Makek , J. Marroncle , H. Merkel , U. Müller , L. Nungesser , B. Pasquini , J. Pochodzalla , O. Postavaru , M. Potokar , D. Ryckbosch , S. Sanchez Majos , B. S. Schlimme , M. Seimetz , S. Širca , G. Tamas , R. Van de Vyver , L. Van Hoorebeke , A. Van Overloop , Th. Walcher , M. Weinriefer

Pion production in deeply virtual Compton scattering

Using a soft pion theorem based on chiral symmetry and a $\Delta(1232)$ resonance model we propose an estimate for the production cross section of low energy pions in the deeply virtual Compton scattering (DVCS) process. In particular, we…

High Energy Physics - Phenomenology · Physics 2016-09-06 P. A. M. Guichon , L. Mossé , M. Vanderhaeghen

Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab

We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off $^4$He using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident…

Nuclear Experiment · Physics 2021-08-18 R. Dupré , M. Hattawy , N. A. Baltzell , S. Bültmann , R. De Vita , A. El Alaoui , L. El Fassi , H. Egiyan , F. X. Girod , M. Guidal , K. Hafidi , D. Jenkins , S. Liuti , Y. Perrin , S. Stepanyan , B. Torayev , E. Voutier , M. J. Amaryan , W. R. Armstrong , H. Atac , C. Ayerbe Gayoso , L. Barion , M. Battaglieri , I. Bedlinskiy , F. Benmokhtar , A. Bianconi , A. S. Biselli , M. Bondi , F. Bossù , S. Boiarinov , W. J. Briscoe , D. Bulumulla , V. Burkert , D. S. Carman , J. C. Carvajal , M. Caudron , A. Celentano , P. Chatagnon , V. Chesnokov , T. Chetry , G. Ciullo , B. A. Clary , P. L. Cole , M. Contalbrigo , G. Costantini , V. Crede , A. D'Angelo , N. Dashyan , M. Defurne , A. Deur , S. Diehl , C. Djalali , M. Ehrhart , L. Elouadrhiri , P. Eugenio , S. Fegan , A. Filippi , T. A. Forest , Y. Ghandilyan , G. P. Gilfoyle , R. W. Gothe , K. A. Griffioen , H. Hakobyan , T. B. Hayward , K. Hicks , A. Hobart , M. Holtrop , Y. Ilieva , D. G. Ireland , E. L. Isupov , H. S. Jo , K. Joo , S. Joosten , D. Keller , G. Khachatryan , A. Khanal , M. Khandaker , A. Kim , W. Kim , A. Kripko , V. Kubarovsky , S. E. Kuhn , L. Lanza , K. Livingston , M. L. Kabir , M. Leali , P. Lenisa , I. J. D. MacGregor , D. Marchand , N. Markov , V. Mascagna , M. Mayer , B. McKinnon , M. Mirazita , V. I. Mokeev , K. Neupane , S. Niccolai , T. R. O'Connell , M. Osipenko , M. Paolone , L. L. Pappalardo , R. Paremuzyan , E. Pasyuk , D. Payette , W. Phelps , N. Pivnyuk , O. Pogorelko , J. Poudel , Y. Prok , M. Ripani , J. Ritman , A. Rizzo , G. Rosner , P. Rossi , J. Rowley , F. Sabatié , C. Salgado , A. Schmidt , R. Schumacher , V. Sergeyeva , Y. Sharabian , U. Shrestha , D. Sokhan , O. Soto , N. Sparveris , I. I. Strakovsky , S. Strauch , N. Tyler , M. Ungaro , L. Venturelli , H. Voskanyan , A. Vossen , D. Watts , K. Wei , X. Wei , L. B. Weinstein , R. Wishart , M. H. Wood , B. Yale , N. Zachariou , J. Zhang

Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS

This paper reports the measurement of polarized and unpolarized cross sections for the ep -> e'p' reaction, which is comprised of Deeply Virtual Compton Scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88…

High Energy Physics - Experiment · Physics 2018-10-17 N. Hirlinger Saylor , B. Guegan , V. D. Burkert , L. Elouadrhiri , M. Garcon , F. X. Girod , M. Guidal , H. S. Jo , V. Kubarovsky , S. Niccolai , P. Stoler

First Exclusive Measurement of Deeply Virtual Compton Scattering off $^4$He: Toward the 3D Tomography of Nuclei

We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV electron beam from the CEBAF accelerator at Jefferson Lab…

Nuclear Experiment · Physics 2017-11-22 M. Hattawy , N. A. Baltzell , R. Dupré , K. Hafidi , S. Stepanyan , S. Bültmann , R. De Vita , A. El Alaoui , L. El Fassi , H. Egiyan , F. X. Girod , M. Guidal , D. Jenkins , S. Liuti , Y. Perrin , B. Torayev , E. Voutier , K. P. Adhikari , S. Adhikari , D. Adikaram , Z. Akbar , M. J. Amaryan , S. Anefalos Pereira , Whitney R. Armstrong , H. Avakian , J. Ball , M. Bashkanov , M. Battaglieri , V. Batourine , I. Bedlinskiy , A. S. Biselli , S. Boiarinov , W. J. Briscoe , W. K. Brooks , V. D. Burkert , Frank Thanh Cao , D. S. Carman , A. Celentano , G. Charles , T. Chetry , G. Ciullo , L. Clark , L. Colaneri , P. L. Cole , M. Contalbrigo , O. Cortes , V. Crede , A. D'Angelo , N. Dashyan , E. De Sanctis , A. Deur , C. Djalali , L. Elouadrhiri , P. Eugenio , G. Fedotov , S. Fegan , R. Fersch , A. Filippi , J. A. Fleming , T. A. Forest , A. Fradi , M. Garçon , N. Gevorgyan , Y. Ghandilyan , G. P. Gilfoyle , K. L. Giovanetti , C. Gleason , W. Gohn , E. Golovatch , R. W. Gothe , K. A. Griffioen , L. Guo , H. Hakobyan , C. Hanretty , N. Harrison , D. Heddle , K. Hicks , M. Holtrop , S. M. Hughes , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , H. Jiang , K. Joo , S. Joosten , D. Keller , G. Khachatryan , M. Khachatryan , M. Khandaker , A. Kim , W. Kim , A. Klein , F. J. Klein , V. Kubarovsky , S. E. Kuhn , S. V. Kuleshov , L. Lanza , P. Lenisa , K. Livingston , H. Y. Lu , I . J . D. MacGregor , N. Markov , M. Mayer , M. E. McCracken , B. McKinnon , C. A. Meyer , Z. E. Meziani , T. Mineeva , M. Mirazita , V. Mokeev , R. A. Montgomery , H. Moutarde , A Movsisyan , C. Munoz Camacho , P. Nadel-Turonski , L. A. Net , S. Niccolai , G. Niculescu , I. Niculescu , M. Osipenko , A. I. Ostrovidov , M. Paolone , R. Paremuzyan , K. Park , E. Pasyuk , E. Phelps , W. Phelps , S. Pisano , O. Pogorelko , J. W. Price , Y. Prok , D. Protopopescu , M. Ripani , B. G. Ritchie , A. Rizzo , G. Rosner , P. Rossi , F. Sabatié , C. Salgado , R. A. Schumacher , E. Seder , Y. G. Sharabian , A. Simonyan , Iu. Skorodumina , G. D. Smith , D. Sokhan , N. Sparveris , S. Strauch , M. Taiuti , M. Ungaro , H. Voskanyan , N. K. Walford , D. P. Watts , X. Wei , L. B. Weinstein , M. H. Wood , N. Zachariou , L. Zana , J. Zhang , Z. W. Zhao

Beam Spin Asymmetries in DVCS with CLAS at 4 .8 GeV

We report measurements of the beam spin asymmetry in Deeply Virtual Compton Scattering (DVCS) at an electron beam energy of 4.8 GeV using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The DVCS beam spin asymmetry…

High Energy Physics - Experiment · Physics 2019-08-13 G. Gavalian

Deeply Virtual Compton Scattering at HERA

Deeply virtual Compton scattering has recently been studied by three HERA experiments, H1, ZEUS and HERMES, covering a broad range of kinematic regimes. We present cross section measurements of the two collider experiments in the kinematic…

High Energy Physics - Experiment · Physics 2009-11-07 Jochen Volmer

Monte Carlo simulation of virtual Compton scattering below pion threshold

This paper describes the Monte Carlo simulation developed specifically for the VCS experiments below pion threshold that have been performed at MAMI and JLab. This simulation generates events according to the (Bethe-Heitler + Born) cross…

Data Analysis, Statistics and Probability · Physics 2008-11-26 P. Janssens , L. Van Hoorebeke , H. Fonvieille , N. D'Hose , P. Y. Bertin , I. Bensafa , N. Degrande , M. Distler , R. Di Salvo , L. Doria , J. M. Friedrich , J. Friedrich , Ch. Hyde-Wright , S. Jaminion , S. Kerhoas , G. Laveissiere , D. Lhuillier , D. Marchand , H. Merkel , J. Roche , G. Tamas , M. Vanderhaeghen , R. Van de Vyver , J. Van de Wiele , Th. Walcher

Pion and Sigma Polarizabilities and Radiative Transitions

Fermilab E781 plans measurements of gamma-Sigma and $\gamma$-pion interactions using a 600 GeV beam of Sigmas and pions, and a virtual photon target. Pion polarizabilities and radiative transitions will be measured in this experiment. The…

High Energy Physics - Phenomenology · Physics 2009-10-28 Murray A. Moinester

Compton Scattering on the Charged Pion and the Process \gamma\gamma \to \pi^0 \pi^0

The Compton scattering on a charged pion and the process \gamma\gamma \to \pi^0\pi^0 are studied using the dispersion relations. Unknown parameters of the S-wave \pi\pi interaction, represented as a board Breit-Wignar resonance, and a sum…

Nuclear Theory · Physics 2011-07-19 L. V. Fil'kov , V. L. Kashevarov

Deeply Virtual Compton Scattering at H1 and ZEUS

Results on Deeply Virtual Compton Scattering at HERA measured by the H1 and ZEUS Collaborations are presented. The cross section, measured for the first time, is reported for $Q^2 > 2 GeV^2$, $30 < W < 120 GeV$ and $|t| < 1 GeV^2$.

High Energy Physics - Experiment · Physics 2007-05-23 L. Favart

Measurement of the Total Compton Scattering Cross Section between 6.5 and 11 GeV

The total cross section for Compton scattering off atomic electrons, $\gamma+e\rightarrow\gamma'+e'$, was measured using photons with energies between 6.5 and 11.1 GeV incident on a $^9$Be target as part of the PrimEx-eta experiment in Hall…

Nuclear Experiment · Physics 2025-07-31 GlueX Collaboration , F. Afzal , C. S. Akondi , M. Albrecht , M. Amaryan , S. Arrigo , V. Arroyave , A. Asaturyan , A. Austregesilo , Z. Baldwin , F. Barbosa , J. Barlow , E. Barriga , R. Barsotti , D. Barton , V. Baturin , V. V. Berdnikov , T. Black , W. Boeglin , M. Boer , W. J. Briscoe , T. Britton , R. Brunner , S. Cao , E. Chudakov , G. Chung , P. L. Cole , O. Cortes , V. Crede , M. M. Dalton , D. Darulis , A. Deur , S. Dobbs , A. Dolgolenko , M. Dugger , R. Dzhygadlo , D. Ebersole , M. Edo , T. Erbora , P. Eugenio , A. Fabrizi , C. Fanelli , S. Fang , M. Fritsch , S. Furletov , L. Gan , H. Gao , A. Gardner , A. Gasparian , D. I. Glazier , C. Gleason , V. S. Goryachev , B. Grube , J. Guo , L. Guo , J. Hernandez , K. Hernandez , N. D. Hoffman , D. Hornidge , G. M. Huber , P. Hurck , W. Imoehl , D. G. Ireland , M. M. Ito , I. Jaegle , N. S. Jarvis , T. Jeske , M. Jing , R. T. Jones , V. Kakoyan , G. Kalicy , V. Khachatryan , C. Kourkoumelis , A. LaDuke , I. Larin , D. Lawrence , D. I. Lersch , H. Li , B. Liu , K. Livingston , L. Lorenti , V. Lyubovitskij , A. Mahmood , H. Marukyan , V. Matveev , M. McCaughan , M. McCracken , C. A. Meyer , R. Miskimen , R. E. Mitchell , K. Mizutani , P. Moran , V. Neelamana , L. Ng , E. Nissen , S. Orešić , A. I. Ostrovidov , Z. Papandreou , C. Paudel , R. Pedroni , L. Pentchev , K. J. Peters , E. Prather , L. Puthiya Veetil , S. Rakshit , J. Reinhold , A. Remington , B. G. Ritchie , J. Ritman , G. Rodriguez , D. Romanov , K. Saldana , C. Salgado , S. Schadmand , A. M. Schertz , K. Scheuer , A. Schick , A. Schmidt , R. A. Schumacher , J. Schwiening , M. Scott , N. Septian , P. Sharp , V. J. Shen , X. Shen , M. R. Shepherd , J. Sikes , H. Singh , A. Smith , E. S. Smith , D. I. Sober , A. Somov , S. Somov , J. R. Stevens , I. I. Strakovsky , B. Sumner , K. Suresh , V. V. Tarasov , S. Taylor , A. Teymurazyan , A. Thiel , M. Thomson , T. Viducic , T. Whitlatch , N. Wickramaarachchi , Y. Wunderlich , B. Yu , J. Zarling , Z. Zhang , X. Zhou , B. Zihlmann

Pion Polarizabilities at CERN COMPASS

The electric alpha and magnetic beta pion Compton polarizabilities characterize the pion's deformation in the electromagnetic field of the gamma during gamma-pi Compton scattering. The chi_PT effective Lagrangian, using data from radiative…

High Energy Physics - Experiment · Physics 2007-05-23 Murray Moinester

Virtual Compton Scattering measurements in the nucleon resonance region

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…

Nuclear Experiment · Physics 2020-01-08 A. Blomberg , H. Atac , N. Sparveris , M. Paolone , P. Achenbach , M. Benali , J. Beričič , R. Böhm , L. Correa , M. O. Distler , A. Esser , D. Flay , H. Fonvieille , I. Friščić , Y. Kohl , H. Merkel , U. Müller , Z. E. Meziani , M. Mihovilovic , J. Pochodzalla , A. Polychronopoulou , B. Pasquini , M. Schoth , F. Schulz , S. Schlimme , C. Sfienti , S. Sirca , A. Weber

Cross sections for low-energy $\pi^-\gamma$ reactions

We review the cross sections for low-energy $\pi^- \gamma$ reactions in the framework of chiral perturbation theory. Charged pion Compton scattering, $\pi^- \gamma\to \pi^-\gamma$, is considered up to one-loop order where the pion's…

Nuclear Theory · Physics 2008-11-26 N. Kaiser , J. M. Friedrich

Deeply Virtual Compton Scattering at HERA

Results on Deeply Virtual Compton Scattering at HERA measured by the H1 and ZEUS Collaborations are presented. The cross section, measured for the first time, is reported for Q^2 > 2 GeV^2.

High Energy Physics - Experiment · Physics 2007-05-23 L. Favart