Related papers: Beam-helicity and beam-charge asymmetries associat…

Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized HERA positron beam scattering off an unpolarized hydrogen target is measured at HERMES. The asymmetry arises from deeply virtual…

High Energy Physics - Experiment · Physics 2012-11-29 The HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan , S. Belostotski , H. P. Blok , A. Borissov , J. Bowles , I. Brodski , V. Bryzgalov , J. Burns , M. Capiluppi , G. P. Capitani , E. Cisbani , G. Ciullo , M. Contalbrigo , P. F. Dalpiaz , W. Deconinck , R. De Leo , L. De Nardo , E. De Sanctis , M. Diefenthaler , P. Di Nezza , M. Düren , M. Ehrenfried , G. Elbakian , F. Ellinghaus , E. Etzelmüller , R. Fabbri , A. Fantoni , L. Felawka , S. Frullani , G. Gapienko , V. Gapienko , F. Garibaldi , G. Gavrilov , V. Gharibyan , F. Giordano , S. Gliske , M. Golembiovskaya , I. M. Gregor , H. Guler , M. Hartig , D. Hasch , A. Hillenbrand , M. Hoek , Y. Holler , I. Hristova , A. Ivanilov , H. E. Jackson , H. S. Jo , S. Joosten , R. Kaiser , G. Karyan , T. Keri , E. Kinney , A. Kisselev , V. Korotkov , V. Kozlov , B. Krauss , P. Kravchenko , V. G. Krivokhijine , L. Lagamba , L. Lapikás , I. Lehmann , P. Lenisa , A. López Ruiz , W. Lorenzon , S. Lu , X. Lu , B. -Q. Ma , D. Mahon , N. C. R. Makins , S. I. Manaenkov , L. Manfré , Y. Mao , B. Marianski , A. Martinez de la Ossa , H. Marukyan , C. A. Miller , Y. Miyachi , A. Movsisyan , M. Murray , A. Mussgiller , E. Nappi , Y. Naryshkin , A. Nass , M. Negodaev , W. -D. Nowak , A. Osborne , L. L. Pappalardo , R. Perez-Benito , A. Petrosyan , P. E. Reimer , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , L. Rubacek , J. Rubin , D. Ryckbosch , A. Schäfer , G. Schnell , K. P. Schüler , B. Seitz , C. Shearer , T. -A. Shibata , V. Shutov , M. Stancari , M. Statera , J. J. M. Steijger , J. Stewart , S. Taroian , A. Terkulov , R. Truty , A. Trzcinski , M. Tytgat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , S. Wang , S. Yaschenko , Z. Ye , S. Yen , V. Zagrebelnyy , D. Zeiler , B. Zihlmann , P. Zupranski

Separation of contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process in measurements on a hydrogen target

Hard exclusive leptoproduction of real photons from an unpolarized proton target is studied in an effort to elucidate generalized parton distributions. The data accumulated during the years 1996--2005 with the HERMES spectrometer are…

High Energy Physics - Experiment · Physics 2009-12-15 The HERMES collaboration , A. Airapetian

Azimuthal asymmetries in Deeply Virtual Compton Scattering on an unpolarized proton target

Preliminary results on azimuthal asymmetries in leptoproduction of real photons on an unpolarized hydrogen target measured at the HERMES experiment are presented. The analysis of data taken with different beam charges and helicities allows…

High Energy Physics - Experiment · Physics 2019-08-13 Dietmar Zeiler

Beam-Charge Asymmetry associated with DVCS at HERMES

We report the first observation of an azimuthal asymmetry in the hard electroproduction of real photons with respect to the charge of the incoming lepton beam. The asymmetry is attributed to the interference between the Bethe-Heitler…

High Energy Physics - Experiment · Physics 2017-08-23 F. Ellinghaus

Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on an unpolarized deuterium target

Azimuthal asymmetries in exclusive electroproduction of a real photon from an unpolarized deuterium target are measured with respect to beam helicity and charge. They appear in the distribution of these photons in the azimuthal angle phi…

High Energy Physics - Experiment · Physics 2014-11-20 The HERMES Collaboration , A. Airapetian

The Beam--Charge Azimuthal Asymmetry and Deeply Virtual Compton Scattering

The first observation of an azimuthal cross--section asymmetry with respect to the charge of the incoming lepton beam is reported from a study of hard exclusive electroproduction of real photons. The data have been accumulated by the HERMES…

High Energy Physics - Experiment · Physics 2012-08-03 The HERMES Collaboration , A. Airapetian

Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets

A measurement of beam-helicity asymmetries for single-hadron production in deep-inelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen and deuterium targets were collected by the…

High Energy Physics - Experiment · Physics 2019-09-17 HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , S. Belostotski , H. P. Blok , V. Bryzgalov , G. P. Capitani , E. Cisbani , G. Ciullo , M. Contalbrigo , W. Deconinck , E. De Sanctis , M. Diefenthaler , P. Di Nezza , M. Düren , G. Elbakian , F. Ellinghaus , A. Fantoni , L. Felawka , G. Gapienko , F. Garibaldi , G. Gavrilov , V. Gharibyan , A. Hillenbrand , Y. Holler , A. Ivanilov , H. E. Jackson , S. Joosten , R. Kaiser , G. Karyan , E. Kinney , A. Kisselev , V. Korotkov , V. Kozlov , P. Kravchenko , L. Lagamba , L. Lapikás , I. Lehmann , P. Lenisa , W. Lorenzon , S. I. Manaenkov , B. Marianski , H. Marukyan , A. Movsisyan , V. Muccifora , A. Nass , G. Nazaryan , W. -D. Nowak , L. L. Pappalardo , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , D. Ryckbosch , G. Schnell , B. Seitz , T. -A. Shibata , V. Shutov , M. Statera , A. Terkulov , A. Trzcinski , M. Tytgat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , I. Vilardi , C. Vogel , S. Yaschenko , V. Zagrebelnyy , D. Zeiler , B. Zihlmann , P. Zupranski

Deeply-Virtual Compton Scattering on Deuterium and Neon at HERMES

We report the first observation of azimuthal beam-spin asymmetries in hard electroproduction of real photons off nuclei. Attributed to the interference between the Bethe-Heitler process and the deeply-virtual Compton scattering process, the…

High Energy Physics - Experiment · Physics 2019-08-14 F. Ellinghaus , R. Shanidze , J. Volmer

Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering

The beam-spin asymmetry in hard electroproduction of photons has been measured for the first time. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an…

High Energy Physics - Experiment · Physics 2010-05-28 HERMES Collaboration , A. Airapetian

Beam-helicity asymmetry in associated electroproduction of real photons $ep \to e\gamma \pi N$ in the $\Delta$-resonance region

The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e\gamma \pi N$, in the $\Delta$(1232)-resonance region is measured using the longitudinally polarized HERA positron beam and an unpolarized hydrogen target.…

High Energy Physics - Experiment · Physics 2014-02-12 The HERMES Collaboration , A. Airapetian , N. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan , H. P. Blok , H. Böttcher , A. Borissov , J. Bowles , I. Brodski , V. Bryzgalov , J. Burns , G. P. Capitani , E. Cisbani , G. Ciullo , M. Contalbrigo , P. F. Dalpiaz , W. Deconinck , R. De Leo , E. De Sanctis , M. Diefenthaler , P. Di Nezza , M. Düren , M. Ehrenfried , G. Elbakian , F. Ellinghaus , E. Etzelmüller , R. Fabbri , S. Frullani , G. Gapienko , V. Gapienko , J. Garay García , F. Garibaldi , G. Gavrilov , V. Gharibyan , F. Giordano , S. Gliske , M. Hartig , D. Hasch , Y. Holler , I. Hristova , A. Ivanilov , H. E. Jackson , S. Joosten , R. Kaiser , G. Karyan , T. Keri , E. Kinney , A. Kisselev , V. Korotkov , V. Kozlov , P. Kravchenko , V. G. Krivokhijine , L. Lagamba , L. Lapikás , I. Lehmann , P. Lenisa , W. Lorenzon , X. -G. Lu , B. -Q. Ma , D. Mahon , N. C. R. Makins , S. I. Manaenkov , Y. Mao , B. Marianski , H. Marukyan , C. A. Miller , Y. Miyachi , A. Movsisyan , V. Muccifora , M. Murray , A. Mussgiller , Y. Naryshkin , A. Nass , M. Negodaev , W. -D. Nowak , L. L. Pappalardo , R. Perez-Benito , A. Petrosyan , P. E. Reimer , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , J. Rubin , D. Ryckbosch , Y. Salomatin , A. Schäfer , G. Schnell , B. Seitz , T. -A. Shibata , M. Stahl , M. Statera , E. Steffens , J. J. M. Steijger , J. Stewart , F. Stinzing , S. Taroian , A. Terkulov , R. Truty , A. Trzcinski , M. Tytgat , Y. Van Haarlem , C. Van Hulse , V. Vikhrov , I. Vilardi , S. Wang , S. Yaschenko , Z. Ye , S. Yen , V. Zagrebelnyy , B. Zihlmann , P. Zupranski

Future Measurements of Deeply Virtual Compton Scattering at HERMES

Prospects for future measurements of Deeply Virtual Compton Scattering at HERMES are studied using different simple models for parameterizations of generalized parton distributions (GPDs). Measurements of the lepton charge and lepton beam…

High Energy Physics - Phenomenology · Physics 2011-09-13 V. A. Korotkov , W. -D. Nowak

Ratios of helicity amplitudes for exclusive $\rho^0$ electroproduction on transversely polarized protons

Exclusive $\rho^0$-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0…

High Energy Physics - Experiment · Physics 2025-01-08 The HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , S. Belostotski , H. P. Blok , A. Borissov , V. Bryzgalov , G. P. Capitani , G. Ciullo , M. Contalbrigo , W. Deconinck , R. De Leo , E. De Sanctis , M. Düren , G. Elbakian , F. Ellinghaus , L. Felawka , S. Frullani , F. Garibaldi , G. Gavrilov , V. Gharibyan , S. V. Goloskokov , Y. Holler , A. Ivanilov , H. E. Jackson , S. Joosten , R. Kaiser , G. Karyan , A. Kisselev , V. Korotkov , V. Kozlov , P. Kravchenko , P. Kroll , L. Lagamba , L. Lapikás , I. Lehmann , P. Lenisa , W. Lorenzon , S. I. Manaenkov , B. Marianski , H. Marukyan , Y. Miyachi , A. Movsisyan , V. Muccifora , A. Nass , W. -D. Nowak , L. L. Pappalardo , A. Petrosyan , P. E. Reimer , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , D. Ryckbosch , Y. Salomatin , A. Schäfer , G. Schnell , B. Seitz , T. -A. Shibata , V. Shutov , M. Statera , A. Terkulov , R. Truty , A. Trzcinski , M. Tytgat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , S. Yaschenko , B. Zihlmann , P. Zupranski

Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering

The nuclear-mass dependence of azimuthal cross section asymmetries with respect to charge and longitudinal polarization of the lepton beam is studiedfor hard exclusive electroproduction of real photons. The observed beam-charge and…

High Energy Physics - Experiment · Physics 2010-04-06 The HERMES collaboration , A. Airapetian

Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on a longitudinally polarized deuterium target

Azimuthal asymmetries in exclusive electroproduction of a real photon from a longitudinally polarized deuterium target are measured with respect to target polarization alone and with respect to target polarization combined with beam…

High Energy Physics - Experiment · Physics 2011-05-03 The HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan , S. Belostotski , N. Bianchi , H. P. Blok , A. Borissov , J. Bowles , I. Brodski , V. Bryzgalov , J. Burns , M. Capiluppi , G. P. Capitani , E. Cisbani , G. Ciullo , M. Contalbrigo , P. F. Dalpiaz , W. Deconinck , R. De Leo , L. De Nardo , E. De Sanctis , M. Diefenthaler , P. Di Nezza , M. Dueren , M. Ehrenfried , G. Elbakian , F. Ellinghaus , A. Fantoni , L. Felawka , S. Frullani , D. Gabbert , G. Gapienko , V. Gapienko , F. Garibaldi , G. Gavrilov , V. Gharibyan , F. Giordano , S. Gliske , M. Golembiovskaya , C. Hadjidakis , M. Hartig , D. Hasch , G. Hill , A. Hillenbrand , M. Hoek , Y. Holler , I. Hristova , Y. Imazu , A. Ivanilov , H. E. Jackson , A. Jgoun , H. S. Jo , S. Joosten , R. Kaiser , G. Karyan , T. Keri , E. Kinney , A. Kisselev , N. Kobayashi , V. Korotkov , V. Kozlov , B. Krauss , P. Kravchenko , V. G. Krivokhijine , L. Lagamba , R. Lamb , L. Lapikas , I. Lehmann , P. Lenisa , L. A. Linden-Levy , A. Lopez Ruiz , W. Lorenzon , X. -G. Lu , X. -R. Lu , B. -Q. Ma , D. Mahon , N. C. R. Makins , S. I. Manaenkov , L. Manfre , Y. Mao , B. Marianski , A. Martinez de la Ossa , H. Marukyan , C. A. Miller , A. Movsisyan , V. Muccifora , M. Murray , D. Mueller , A. Mussgiller , E. Nappi , Y. Naryshkin , A. Nass , M. Negodaev , W. -D. Nowak , L. L. Pappalardo , R. Perez-Benito , N. Pickert , M. Raithel , P. E. Reimer , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , J. Rubin , D. Ryckbosch , Y. Salomatin , F. Sanftl , A. Schaefer , G. Schnell , K. P. Schueler , B. Seitz , T. -A. Shibata , V. Shutov , M. Stancari , M. Statera , E. Steffens , J. J. M. Steijger , H. Stenzel , J. Stewart , F. Stinzing , S. Taroian , A. Terkulov , A. Trzcinski , M. Tytgat , A. Vandenbroucke , P. B. Van der Nat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , C. Vogel , S. Wang , S. Yaschenko , Z. Ye , S. Yen , W. Yu , D. Zeiler , B. Zihlmann , P. Zupranski

Exclusive pi^+ production at HERMES

Hard exclusive production in deep inelastic lepton scattering provides access to the unknown Generalized Parton Distributions (GPDs) of the nucleon. At HERMES, different observables for hard exclusive pi^+ production have been measured with…

High Energy Physics - Experiment · Physics 2019-08-14 C. Hadjidakis , D. Hasch , E. Thomas

Deeply Virtual Compton Scattering Beam-Spin Asymmetries

The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the…

High Energy Physics - Experiment · Physics 2019-08-13 F. X. Girod , R. A. Niyazov et al

Exclusive meson production at HERMES

The data were accumulated with the HERMES forward spectrometer using the 27.6 GeV longitudinally polarized electron or positron beam of HERA. Exclusive electroproduction of $\omega$ mesons on unpolarized hydrogen and deuterium targets is…

High Energy Physics - Phenomenology · Physics 2016-07-11 Sergey Manaenkov

Predictions for deeply virtual Compton scattering on a spin-one target

We consider hard leptoproduction of a photon on a spin-one target and give the general azimuthal angular dependence of the differential cross section. Furthermore, we estimate the beam spin asymmetry for an unpolarized deuteron target at…

High Energy Physics - Phenomenology · Physics 2007-05-23 A. Kirchner , D. Müller

Double-Spin Asymmetry in the Cross Section for Exclusive rho^0 Production in Lepton-Proton Scattering

Evidence for a positive longitudinal double-spin asymmetry <A_1^rho> = 0.24 +-0.11 (stat) +-0.02 (syst) in the cross section for exclusive diffractive rho^0(770) vector meson production in polarised lepton-proton scattering was observed by…

High Energy Physics - Experiment · Physics 2009-04-15 HERMES Collaboration , A. Airapetian

Beam charge asymmetries for deeply virtual Compton scattering off the proton

The unpolarized and polarized Beam Char\-ge Asymmetries (BCAs) of the $\vv{e}^{\pm}p \to e^{\pm}p \gamma$ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National…

Nuclear Experiment · Physics 2021-06-30 V. Burkert , L. Elouadrhiri , F. -X. Girod , S. Niccolai , E. Voutier , A. Afanasev , L. Barion , M. Battaglieri , J. C. Bernauer , A. Bianconi , R. Capobianco , M. Caudron , L. Causse , P. Chatagnon , T. Chetry , G. Ciullo , P. L. Cole , M. Contalbrigo , G. Costantini , M. Defurne , A. ~Deur , S. Diehl , R. Dupré , M. Ehrhart , I. P. Fernando , A. Filippi , T. Forest , J. Grames , P. Gueye , S. Habet , D. Higinbotham , A. Hobart , C. E. Hyde , K. Joo , A. Kim , V. Klimenko , H. -S. Ko , V. Kubarovsky , M. Leali , P. Lenisa , D. Marchand , V. Mascagna , M. McCaughan , B. McKinnon , A. Movsisyan , C. Muñoz~Camacho , L. Pappalardo , E. Pasyuk , M. Poelker , K. Price , B. Raue , M. Shabestari , R. Santos , V. Sergeyeva , I. Strakovsky , P. Stoler , L. Venturelli , S. Zhao , Z. W. ~Zhao , the CLAS Collaboration