Related papers: Baryon spectroscopy with polarization observables …

Review of Recent Jlab Results

High quality polarized electron beams at Jefferson Lab make possible precision measurements of hadronic properties in the regime of strongly interacting QCD. We will describe a few programs at Jefferson Lab that are making measurements that…

Nuclear Experiment · Physics 2014-11-18 Elton S. Smith

Measuring Form Factors and Structure Functions with CLAS

The physics program at the Thomas Jefferson National Accelerator Facility includes a strong effort to measure form factors and structure functions to probe the structure of hadronic matter, reveal the nature of confinement, and develop an…

High Energy Physics - Experiment · Physics 2007-11-01 G. P. Gilfoyle

Nucleon Resonance Structure from Exclusive Meson Electroproduction with CLAS

Studies of the nucleon resonance electroexcitation amplitudes in a wide range of photon virtualities offer unique information on many facets of strong QCD behind the generation of all prominent excited nucleon states. Advances in the…

Nuclear Experiment · Physics 2022-10-19 Victor I. Mokeev

Physics with Positron Beams at Jefferson Lab 12 GeV

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental program at the next generation of lepton accelerators. In the context of the Hadronic Physics program at the Jefferson Laboratory…

Nuclear Experiment · Physics 2019-06-25 A. Afanasev , I. Albayrak , S. Ali , M. Amaryan , A. D'Angelo , J. Annand , J. Arrington , A. Asaturyan , H. Avakian , T. Averett , L. Barion , M. Battaglieri , V. Bellini , V. Berdnikov , J. Bernauer , A. Biselli , M. Boer , M. Bondì , K. -T. Brinkmann , B. Briscoe , V. Burkert , A. Camsonne , T. Cao , L. Cardman , M. Carmignotto , L. Causse , A. Celentano , P. Chatagnon , G. Ciullo , M. Contalbrigo , D. Day , M. Defurne , S. Diehl , B. Dongwi , R. Dupré , D. Dutta , M. Ehrhart , L. Elouadrhiri , R. Ent , I. Fernando , A. Filippi , Y. Furletova , H. Gao , A. Gasparian , D. Gaskell , F. Georges , F. -X. Girod , J. Grames , C. Gu , M. Guidal , D. Hamilton , D. Hasell , D. Higinbotham , M. Hoballah , T. Horn , C. Hyde , A. Italiano , N. Kalantarians , G. Kalicy , D. Keller , C. Keppel , M. Kerver , P. King , E. Kinney , H. -S. Ko , M. Kohl , V. Kubarovsky , L. Lanza , P. Lenisa , N. Liyanage , S. Liuti , J. Mamei , D. Marchand , P. Markowitz , L. Marsicano , M. Mazouz , M. McCaughan , B. McKinnon , M. Mihovilovič , R. Milner , A. Mkrtchyan , H. Mkrtchyan , A. Movsisyan , C. Muñoz Camacho , P. Nadel-Turońs , M. De Napoli , J. Nazeer , S. Niccolai , G. Niculescu , R. Novotny , L. Pappalardo , R. Paremuzyan , E. Pasyuk , T. Patel , I. Pegg , D. Perera , A. Puckett , N. Randazzo , M. Rashad , M. Rathnayake , A. Rizzo , J. Roche , O. Rondon , A. Schmidt , M. Shabestari , Y. Sharabian , S. Širca , D. Sokhan , A. Somov , N. Sparveris , S. Stepanyan , I. Strakovsky , V. Tadevosyan , M. Tiefenback , R. Trotta , R. De Vita , H. Voskanyan , E. Voutier , R. Wang , B. Wojtsekhowski , S. Wood , H. -G. Zaunick , S. Zhamkochyan , J. Zhang , S. Zhao , X. Zheng , C. Zorn

Beam-Recoil Transferred Polarization in $K^+Y$ Electroproduction in the Nucleon Resonance Region with CLAS12

Beam-recoil transferred polarizations for the exclusive electroproduction of $K^+\Lambda$ and $K^+\Sigma^0$ final states from an unpolarized proton target have been measured using the CLAS12 spectrometer at Jefferson Laboratory. The…

Nuclear Experiment · Physics 2022-06-15 D. S. Carman , A. D'Angelo , L. Lanza , V. I. Mokeev , K. P. Adhikari , M. J. Amaryan , W. R. Armstrong , H. Atac , H. Avakian , C. Ayerbe Gayoso , N. A. Baltzell , L. Barion , M. Battaglieri , I. Bedlinskiy , B. Benkel , A. Bianconi , A. S. Biselli , M. Bondi , S. Boiarinov , F. Bossu , W. J. Briscoe , S. Bueltmann , D. Bulumulla , V. D. Burkert , R. Capobianco , J. C. Carvajal , A. Celentano , P. Chatagnon , V. Chesnokov , T. Chetry , G. Ciullo , L. Clark , P. L. Cole , M. Contalbrigo , G. Costantini , V. Crede , N. Dashyan , R. De Vita , M. Defurne , A. Deur , S. Diehl , C. Djalali , R. Dupre , M. Ehrhart , A. El Alaoui , L. El Fassi , L. Elouadrhiri , S. Fegan , A. Filippi , G. Gavalian , Y. Ghandilyan , G. P. Gilfoyle , F. X. Girod , D. I. Glazier , A. A. Golubenko , R. W. Gothe , Y. Gotra , K. A. Griffioen , K. Hafidi , H. Hakobyan , M. Hattawy , F. Hauenstein , T. B. Hayward , A. Hobart , M. Holtrop , Y. Ilieva , D. G. Ireland , E. L. Isupov , H. S. Jo , K. Joo , D. Keller , A. Khanal , A. Kim , W. Kim , V. Klimenko , A. Kripko , V. Kubarovsky , M. Leali , S. Lee , P. Lenisa , K. Livingston , I. J. D. MacGregor , D. Marchand , L. Marsicano , V. Mascagna , M. Mayer , B. McKinnon , S. Migliorati , T. Mineeva , M. Mirazita , R. A. Montgomery , C. Munoz Camacho , P. Nadel-Turonski , K. Neupane , J. Newton , S. Niccolai , M. Osipenko , P. Pandey , M. Paolone , L. L. Pappalardo , R. Paremuzyan , E. Pasyuk , S. J. Paul , N. Pilleux , O. Pogorelko , J. W. Price , Y. Prok , B. A. Raue , T. Reed , M. Ripani , J. Ritman , A. Rizzo , P. Rossi , F. Sabatie , C. Salgado , A. Schmidt , Y. G. Sharabian , E. V. Shirokov , U. Shrestha , P. Simmerling , D. Sokhan , N. Sparveris , S. Stepanyan , I. I. Strakovsky , S. Strauch , N. Tyler , R. Tyson , M. Ungaro , S. Vallarino , L. Venturelli , H. Voskanyan , E. Voutier , D. P. Watts , K. Wei , X. Wei , R. Wishart , M. H. Wood , B. Yale , N. Zachariou , J. Zhang , V. Ziegler

Spectrum and Structure of Excited Baryons with CLAS

In this contribution we discuss recent results in light quark baryon spectroscopy involving CLAS data and higher level analysis results from the partial wave analysis by the Bonn-Gatchina group. New baryon states were discovered largely…

Nuclear Experiment · Physics 2017-03-08 Volker D. Burkert

Recent Results from Jefferson Lab

Recent results on studies of the structure of nucleons and nuclei in the regime of strong interaction QCD are discussed. Use of high current polarized electron beams, polarized targets, and recoil polarimeters, in conjunction with modern…

Nuclear Theory · Physics 2008-11-26 Volker D. Burkert

Study of Nucleon Resonances with Double Polarization Observables of Pion Photoproduction

The role of the nucleon resonances in the double polarization observables of pion photoproduction is investigated by using the resonance parameters predicted by Capstick and Roberts. As an example, we show that the not-well-determined…

Nuclear Theory · Physics 2009-11-07 D. Dutta , H. Gao , T. -S. H. Lee

The N* Program at Jefferson Lab - Status and Prospects

I discuss recent results on the electroproduction and photoproduction of mesons in the region of non-strange baryon resonances. Results on the quadrupole transition from the ground state nucleon to the Delta(1232) show the importance of…

High Energy Physics - Phenomenology · Physics 2007-05-23 Volker D. Burkert

Photoproduction of the $f_2(1270)$ meson using the CLAS detector

The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a molecular state…

Nuclear Experiment · Physics 2021-03-03 M. ~Carver , A. ~Celentano , K. ~Hicks , L. ~Marsicano , V. ~Mathieu , A. ~Pilloni , K. P. ~Adhikari , S. Adhikari , M. J. ~Amaryan , Giovanni Angelini , H. ~Atac , N. A. ~Baltzell , L. Barion , M. ~Battaglieri , I. ~Bedlinskiy , Fatiha Benmokhtar , A. ~Bianconi , A. S. ~Biselli , M. ~Bondi , F. ~Bossù , S. ~Boiarinov , W. J. ~Briscoe , W. K. ~Brooks , D. ~Bulumulla , V. D. ~Burkert , D. S. ~Carman , J. C. ~Carvajal , P. ~Chatagnon , T. ~Chetry , G. ~Ciullo , L. ~Clark , B. A. ~Clary , P. L. ~Cole , M. ~Contalbrigo , V. ~Crede , A. ~D'Angelo , N. ~Dashyan , R. ~De~Vita , M. Defurne , A. ~Deur , S. Diehl , C. ~Djalali , M. ~Dugger , R. ~Dupre , H. ~Egiyan , M. ~Ehrhart , A. ~El~Alaoui , L. ~El~Fassi , P. ~Eugenio , G. ~Fedotov , S. ~Fegan , A. ~Filippi , G. ~Gavalian , N. ~Gevorgyan , G. P. ~Gilfoyle , F. X. ~Girod , R. W. ~Gothe , K. A. ~Griffioen , K. ~Hafidi , H. ~Hakobyan , M. ~Hattawy , T. B. ~Hayward , D. ~Heddle , M. ~Holtrop , Q. ~Huang , C. E. ~Hyde , Y. ~Ilieva , D. G. ~Ireland , E. L. ~Isupov , D. ~Jenkins , H. S. ~Jo , K. ~Joo , S. ~ Joosten , D. ~Keller , A. ~Khanal , M. ~Khandaker , A. ~Kim , C. W. ~Kim , F. J. ~Klein , A. ~Kripko , V. ~Kubarovsky , L. ~Lanza , M. ~Leali , P. ~Lenisa , K. ~Livingston , I. J. D. ~MacGregor , D. ~Marchand , V. ~Mascagna , M. E. ~McCracken , B. ~McKinnon , Z. E. ~Meziani , V. ~Mokeev , A~Movsisyan , E. ~Munevar , C. ~Munoz~Camacho , P. ~Nadel-Turonski , K. ~Neupane , S. ~Niccolai , G. ~Niculescu , M. ~Osipenko , A. I. ~Ostrovidov , M. ~Paolone , L. L. ~Pappalardo , R. ~Paremuzyan , E. ~Pasyuk , W. ~Phelps , O. ~Pogorelko , Y. ~Prok , D. ~Protopopescu , M. ~Ripani , B. G. ~Ritchie , J. ~Ritman , A. ~Rizzo , G. ~Rosner , J. ~Rowley , F. ~Sabatié , C. ~Salgado , A. ~Schmidt , R. A. ~Schumacher , Y. G. ~Sharabian , U. ~Shrestha , D. ~Sokhan , O. ~Soto , N. ~Sparveris , S. ~Stepanyan , I. I. ~Strakovsky , S. ~Strauch , N. ~Tyler , R. ~Tyson , M. ~Ungaro , L. ~Venturelli , H. ~Voskanyan , E. ~Voutier , D. P. ~Watts , K. ~Wei , X. ~Wei , B. ~Yale , N. ~Zachariou , J. ~Zhang , Z. W. ~Zhao

A polarized positron source for CEBAF

A compact polarized positron source for Jefferson Lab is discussed. This scheme relies upon a high polarization (85%), high current (1 mA), low-energy (<100 MeV) electron beam to generate polarized positrons in a conversion target via…

Accelerator Physics · Physics 2009-10-16 J. Dumas , J. Grames , E. Voutier

The incompleteness of complete pseudoscalar-meson photoproduction

[Background] A complete set is a minimum set of observables which allows one to determine the underlying reaction amplitudes unambiguously. Pseudoscalar-meson photoproduction from the nucleon is characterized by four such amplitudes and…

Nuclear Theory · Physics 2013-05-29 Tom Vrancx , Jan Ryckebusch , Tom Van Cuyck , Pieter Vancraeyveld

Electromagnetic properties of baryon resonances

Longitudinal and transverse transition form factors for most of the four-star nucleon resonances have been obtained from high-quality cross section data and polarization observables measured at MAMI, ELSA, BATES, GRAAL and CEBAF. As an…

Nuclear Theory · Physics 2015-06-11 Lothar Tiator

Study of the Hyperon-Nucleon Interaction via Final-State Interactions in Exclusive Reactions

A novel approach that allows access to long-sought information on the Hyperon-Nucleon (YN) interaction was developed by producing a hyperon beam within a few-body nuclear system, and studying final-state interactions. The determination of…

Nuclear Experiment · Physics 2019-12-10 Nicholas Zachariou , Daniel Watts , Yordanka Ilieva

Elliptical Polarization in Partial Wave Analysis of Two Spinless Meson Photoproduction

Mathematical ambiguities in partial-wave analysis present a significant challenge to the extraction of resonance properties in hadronic reactions. Recent work has shown that while linear photon polarization can resolve continuous…

High Energy Physics - Phenomenology · Physics 2025-09-24 Derek I. Glazier , Vincent Mathieu

CLAS12 RICH: New Hybrid Geometry for Strangeness Studies

The Jefferson Lab CLAS12 detector will provide a world-leading facility for the study of electron-nucleon scattering. The CLAS12 physics program is very broad and includes studies on quarks dynamics as well as studies on the meson and…

Instrumentation and Detectors · Physics 2018-07-25 Giovanni Angelini

Transverse Polarization of $\Sigma^{+}(1189)$ in Photoproduction on a Hydrogen Target in CLAS

Experimental results on the $\Sigma^+(1189)$ hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are presented. The $\Sigma^+(1189)$ was reconstructed in the exclusive…

Nuclear Experiment · Physics 2013-04-24 C. S. Nepali , M. Amaryan , K. P. Adhikari , M. Aghasyan , S. Anefalos Pereira , H. Baghdasaryan , J. Ball , M. Battaglieri , V. Batourine , I. Bedlinskiy , A. S. Biselli , J. Bono , S. Boiarinov , W. J. Briscoe , S. Bültmann , V. D. Burkert , D. S. Carman , A. Celentano , S. Chandavar , G. Charles , P. L. Cole , P. Collins , M. Contalbrigo , V. Crede , N. Dashyan , R. De Vita , E. De Sanctis , A. Deur , C. Djalali , D. Doughty , R. Dupre , A. El Alaoui , L. El Fassi , G. Fedotov , S. Fegan , R. Fersch , J. A. Fleming , M. Y. Gabrielyan , N. Gevorgyan , K. L. Giovanetti , F. X. Girod , D. I. Glazier , J. T. Goetz , W. Gohn , E. Golovatch , R. W. Gothe , K. A. Griffioen , M. Guidal , N. Guler , K. Hafidi , H. Hakobyan , C. Hanretty , N. Harrison , D. Heddle , K. Hicks , D. Ho , M. Holtrop , C. E. Hyde , Y. Ilieva , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , H. S. Jo , D. Keller , M. Khandaker , P. Khetarpal , A. Kim , W. Kim , A. Klein , F. J. Klein , S. Koirala , V. Kubarovsky , S. E. Kuhn , S. V. Kuleshov , N. D. Kvaltine , H. Y. Lu , I . J . D. MacGregor , N. Markov , M. Mayer , B. McKinnon , T. Mineeva , M. Mirazita , V. Mokeev , R. A. Montgomery , E. Munevar , C. Munoz Camacho , P. Nadel-Turonski , S. Niccolai , G. Niculescu , I. Niculescu , M. Osipenko , A. I. Ostrovidov , L. L. Pappalardo , R. Paremuzyan , K. Park , S. Park , E. Pasyuk , E. Phelps , J. J. Phillips , S. Pisano , O. Pogorelko , S. Pozdniakov , J. W. Price , S. Procureur , D. Protopopescu , A. J. R. Puckett , B. A. Raue , D. Rimal , M. Ripani , B. G. Ritchie , G. Rosner , P. Rossi , F. Sabatié , M. S. Saini , C. Salgado , D. Schott , R. A. Schumacher , E. Seder , H. Seraydaryan , Y. G. Sharabian , G. D. Smith , D. I. Sober , D. Sokhan , S. S. Stepanyan , S. Stepanyan , I. I. Strakovsky , S. Strauch , M. Taiuti , W. Tang , C. E. Taylor , Ye Tian , S. Tkachenko , B. Torayev , B. Vernarsky , A. V. Vlassov , H. Voskanyan , E. Voutier , N. K. Walford , D. P. Watts , L. B. Weinstein , D. P. Weygand , N. Zachariou , L. Zana , J. Zhang , Z. W. Zhao , I. Zonta , J. Zhang

Electro- and photoproduction of muon pairs with $\mu$CLAS12: Double Deeply Virtual Compton Scattering, Timelike Compton Scattering, and $J/\psi$ production

The CEBAF Large Acceptance Spectrometer for operation at 12 GeV (CLAS12) at the Thomas Jefferson National Accelerator Facility has played a central role in advancing the understanding of nucleon and nuclear structure. As increasingly…

High Energy Physics - Experiment · Physics 2026-05-13 J. S. Alvarado , N. Baltzell , M. Bondi , P. Chatagnon , R. De Vita , M. Hoballah , V. Kubarovsky , R. Paremuzyan , S. Stepanyan , P. Achenbach , M. Arratia , M. Battaglieri , V. Bertone , A. Bianconi , M. E. Boglione , F. Bossù , G. Bracco , F. Bzeih , S. Bueltmann , V. Burkert , D. S. Carman , T. Cao , M. Carpinelli , E. Cisbani , G. Ciullo , E. Cline , M. Contalbrigo , A. D'Angelo , N. Dashyan , S. Diehl , M. Defurne , L. El Fassi , L. Elouadrhiri , M. Farooq , E. Ferrand , A. Filippi , M. Filippini , C. Fogler , G. Foti , S. Frantzen , A. Fulci , K. Gates , D. I. Glazier , K. Gnanvo , S. Grazzi , M. Hattawy , F. Hauenstein , H. S. Jo , M. Kerr , A. Kripko , L. Lanza , P. Lenisa , X. Li , N. Liyanage , R. M. Marinaro , V. Martínez-Fernández , D. Martiryan , V. Mascagna , M. D. McCaughan , B. McKinnon , C. Mezrag , R. Milner , M. Mirazita , P. Musico , T. Nagorna , P. Nadel-Turonski , H. Nguyen , S. Niccolai , M. Osipenko , L. Pappalardo , C. Paudel , N. Pilleux , A. Pilloni , B. Pire , S. Plavully , L. Polizzi , R. Perrino , B. Raydo , M. Ripani , M. Ronayette , S. Schadmand , A. Schmidt , Y. G. Sharabian , E. Sidoretti , M. Spreafico , I. I. Strakovsky , P. Sznajder , R. Tyson , M. Taiuti , M. Ungaro , G. Urciuoli , S. Vallarino , L. Venturelli , T. Vittorini , E. Voutier , A. Vossen , J. Wagner , Y. Wang , X. Wei , N. Wuerfel , Z. Zhao

The Beam-Target Helicity Asymmetry for $\vec{\gamma} \vec{n} \rightarrow \pi^- p$ in the {\bf{$N^*$} Resonance Region

We report the first beam-target double-polarization asymmetries in the $\gamma + n(p) \rightarrow \pi^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and…

Nuclear Experiment · Physics 2017-05-16 D. Ho , P. Peng , C. Bass , P. Collins , A. D'Angelo , A. Deur , J. Fleming , C. Hanretty , T. Kageya , M. Khandaker , F. J. Klein , E. Klempt , V. Laine , M. M. Lowry , H. Lu , C. Nepali , V. A. Nikonov , T. O'Connell , A. M. Sandorfi , A. V. Sarantsev , R. A. Schumacher , I. I. Strakovsky , A. Švarc , N. K. Walford , X. Wei , C. S. Whisnant , R. L. Workman , I. Zonta , K. P. Adhikari , D. Adikaram , Z. Akbar , M. J. Amaryan , S. Anefalos Pereira , H. Avakian , J. Ball , M. Bashkanov , M. Battaglieri , V. Batourine , I. Bedlinskiy , W. J. Briscoe , V. D. Burkert , D. S. Carman , A. Celentano , G. Charles , T. Chetry , G. Ciullo , L. Clark , L. Colaneri , P. L. Cole , M. Contalbrigo , V. Crede , N. Dashyan , E. De Sanctis , R. De Vita , C. Djalali , R. Dupre , A. El Alaoui , L. El Fassi , L. Elouadrhiri , G. Fedotov , S. Fegan , R. Fersch , A. Filippi , A. Fradi , Y. Ghandilyan , G. P. Gilfoyle , F. X. Girod , D. I. Glazier , C. Gleason , W. Gohn , E. Golovatch , R. W. Gothe , K. A. Griffioen , M. Guidal , L. Guo , H. Hakobyan , N. Harrison , K. Hicks , M. Holtrop , S. M. Hughes , Y. Ilieva , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , D. Jenkins , H. Jiang , H. S. Jo , K. Joo , S. Joosten , D. Keller , G. Khachatryan , A. Kim , W. Kim , A. Klein , V. Kubarovsky , S. V. Kuleshov , L. Lanza , P. Lenisa , K. Livingston , I . J . D. MacGregor , N. Markov , B. McKinnon , T. Mineeva , V. Mokeev , R. A. Montgomery , A Movsisyan , C. Munoz Camacho , G. Murdoch , S. Niccolai , G. Niculescu , M. Osipenko , M. Paolone , R. Paremuzyan , K. Park , E. Pasyuk , W. Phelps , O. Pogorelko , J. W. Price , S. Procureur , D. Protopopescu , M. Ripani , D. Riser , B. G. Ritchie , A. Rizzo , G. Rosner , F. Sabatié , C. Salgado , Y. G. Sharabian , Iu. Skorodumina , G. D. Smith , D. I. Sober , D. Sokhan , N. Sparveris , S. Strauch , Ye Tian , B. Torayev , M. Ungaro , H. Voskanyan , D. P. Watts , M. H. Wood , N. Zachariou , J. Zhang , Z. W. Zhao

The N* Physics Program at Jefferson Lab

Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are discussed. The new data confirm the assertion of the symmetric constituent quark model of the Roper as the first radial excitation of the…

Nuclear Experiment · Physics 2015-05-13 Volker D. Burkert