Related papers: Spin Physics in the Resonance Region

First measurement of target and double spin asymmetries for polarized e- polarized p --> e p pi0 in the nucleon resonance region above the Delta(1232)

The exclusive channel polarized proton(polarized e,e prime p)pi0 was studied in the first and second nucleon resonance regions in the Q2 range from 0.187 to 0.770 GeV2 at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS).…

Nuclear Experiment · Physics 2010-04-06 CLAS Collaboration , A. S. Biselli

Hermes and the spin of the proton

HERMES is a second generation experiment to study the spin structure of the nucleon, in which measurements of the spin dependent properties of semi-inclusive deep-inelastic lepton scattering are emphasized. Data have been accumulated for…

High Energy Physics - Experiment · Physics 2014-11-17 H. E. Jackson

A Study of the Polarized Structure Function g_1^p(x,Q^2) and the Polarized Gluon Distribution Delta g(x,Q^2) at HERA

We present estimates of possible data on spin-dependent asymmetries in inclusive scattering of high energy polarized electrons by high energy polarized protons at HERA with their statistical errors and discuss systematic errors. We show…

High Energy Physics - Phenomenology · Physics 2011-09-13 A. De Roeck , A. Deshpande , V. W. Hughes , J. Lichtenstadt , G. Radel

Q^2-Dependence of the Neutron Spin Structure Function g_2^n at Low Q^2

We present the first measurement of the Q^2-dependence of the neutron spin structure function g_2^n at five kinematic points covering 0.57 (GeV/c)^2 <= Q^2 <= 1.34 (GeV/c)^2 at x~0.2. Though the naive quark-parton model predicts g_2=0,…

Nuclear Experiment · Physics 2008-11-26 K. Kramer

Measurements of Double-Spin Asymmetries in SIDIS of Longitudinally Polarized Leptons off Transversely Polarized Protons

A Fourier analysis of double-spin azimuthal asymmetries measured at HERMES in semi-inclusive deep-inelastic scattering of longitudinally polarized leptons off tranversely polarized protons is presented for pions and charged kaons. The…

High Energy Physics - Experiment · Physics 2019-08-13 L. L. Pappalardo , M. Diefenthaler

Polarized Structure Functions: Theory and Phenomenology

We review the theory of polarized structure functions measured in deep-inelastic lepton-nucleon scattering, focusing on the most recent developments. We concentrate on the structure function $g_1$, emphasizing the phenomenological problems…

High Energy Physics - Phenomenology · Physics 2009-09-25 Stefano Forte

Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the…

High Energy Physics - Experiment · Physics 2019-06-12 HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , S. Belostotski , H. P. Blok , A. Borissov , V. Bryzgalov , 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 , G. Elbakian , F. Ellinghaus , A. Fantoni , L. Felawka , S. Frullani , G. Gavrilov , V. Gharibyan , F. Giordano , S. Gliske , D. Hasch , Y. Holler , 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 , W. Lorenzon , B. -Q. Ma , D. Mahon , S. I. Manaenkov , Y. Mao , B. Marianski , H. Marukyan , Y. Miyachi , A. Movsisyan , V. Muccifora , A. Mussgiller , Y. Naryshkin , A. Nass , G. Nazaryan , 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 , G. Schnell , B. Seitz , T. -A. Shibata , M. Statera , E. Steffens , J. J. M. Steijger , S. Taroian , A. Terkulov , R. Truty , A. Trzcinski , M. Tytgat , P. B. van der Nat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , C. Vogel , S. Wang , S. Yaschenko , B. Zihlmann , P. Zupranski

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

A measurement of the virtual-photon asymmetry A_2(x,Q^2) and of the spin-structure function g_2(x,Q^2) of the proton are presented for the kinematic range 0.004 < x < 0.9 and 0.18 GeV^2 < Q^2 < 20 GeV^2. The data were collected by the…

High Energy Physics - Experiment · Physics 2015-06-03 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 , 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 , 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 , A. Hillenbrand , M. Hoek , Y. Holler , I. Hristova , Y. Imazu , A. Ivanilov , H. E. Jackson , H. S. Jo , 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 , A. López Ruiz , W. Lorenzon , 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 , V. Muccifora , M. Murray , A. Mussgiller , E. Nappi , 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 , F. Sanftl , A. Schäfer , G. Schnell , K. P. Schüler , B. Seitz , T. -A. Shibata , V. Shutov , M. Stancari , M. Statera , E. Steffens , J. J. M. Steijger , J. Stewart , F. Stinzing , S. Taroian , A. Terkulov , R. Truty , A. Trzcinski , M. Tytgat , A. Vandenbroucke , 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

Q^2 Evolution of the Neutron Spin Structure Moments using a He-3 Target

We have measured the spin structure functions $g_1$ and $g_2$ of $^3$He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.07 GeV off a polarized $^3$He target at a 15.5$^{\circ}$…

High Energy Physics - Experiment · Physics 2012-08-27 010 Collaboration , M. Amarian , L. Auerbach , T. Averett , J. Berthot

Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region

We report on measurements of the neutron spin asymmetries $A_{1,2}^n$ and polarized structure functions $g_{1,2}^n$ at three kinematics in the deep inelastic region, with $x=0.33$, 0.47 and 0.60 and $Q^2=2.7$, 3.5 and 4.8 (GeV/c)$^2$,…

Nuclear Experiment · Physics 2009-09-29 X. Zheng

Measurement of R = sigma_L / sigma_T and the Separated Longitudinal and Transverse Structure Functions in the Nucleon Resonance Region

We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2 < Q^2 <…

Nuclear Experiment · Physics 2013-08-12 110 Collaboration , Y. Liang , V. Tvaskis , M. E. Christy , A. Ahmidouch , C. S. Armstrong , J. Arrington , R. Asaturyan , S. Avery , O. K. Baker , D. H. Beck , H. P. Blok , C. W. Bochna , W. Boeglin , P. Bosted , M. Bouwhuis , H. Breuer , D. S. Brown , A. Bruell , R. D. Carlini , J. Cha , N. S. Chant , A. Cochran , L. Cole , S. Danagoulian , D. B. Day , J. Dunne , D. Dutta , R. Ent , H. C. Fenker , B. Fox , L. Gan , H. Gao , K. Garrow , D. Gaskell , A. Gasparian , D. F. Geesaman , R. Gilman , P. L. J. Gu`eye , M. Harvey , R. J. Holt , X. Jiang , M. Jones , C. E. Keppel , E. Kinney , W. Lorenzon , A. Lung , D. J. Mack , P. Markowitz , J. W. Martin , K. McIlhany , D. McKee , D. Meekins , M. A. Miller , R. G. Milner , J. H. Mitchell , H. Mkrtchyan , B. A. Mueller , A. Nathan , G. Niculescu , I. Niculescu , T. G. O'Neill , V. Papavassiliou , S. F. Pate , R. B. Piercey , D. Potterveld , R. D. Ransome , J. Reinhold , E. Rollinde , O. Rondon , P. Roos , A. J. Sarty , R. Sawafta , E. C. Schulte , E. Segbefia , C. Smith , S. Stepanyan , S. Strauch , V. Tadevosyan , L. Tang , R. Tieulent , A. Uzzle , W. F. Vulcan , S. A. Wood , F. Xiong , L. Yuan , M. Zeier , B. Zihlmann , V. Ziskin

Observation of Beam Spin Asymmetries in the Process $e p \rightarrow e \pi^{+}\pi^{-}X$ with CLAS12

The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. The data presented here were taken in the fall of 2018 with the CLAS12 spectrometer…

High Energy Physics - Experiment · Physics 2021-04-21 T. B. Hayward , C. Dilks , A. Vossen , H. Avakian , S. Adhikari , G. Angelini , M. Arratia , H. Atac , C. Ayerbe Gayoso , N. A. Baltzell , L. Barion , M. Battaglieri , I. Bedlinskiy , F. Benmokhtar , A. Bianconi , A. S. Biselli , M. Bondì , F. Bossù , S. Boiarinov , W. J. Briscoe , W. K. Brooks , D. Bulumulla , V. D. Burkert , D. S. Carman , J. C. Carvajal , A. Celentano , P. Chatagnon , T. Chetry , G. Ciullo , B. A. Clary , P. L. Cole , M. Contalbrigo , G. Costantini , V. Crede , A. D'Angelo , N. Dashyan , R. De Vita , M. Defurne , A. Deur , S. Diehl , C. Djalali , R. Dupre , M. Dugger , H. Egiyan , M. Ehrhart , A. El Alaoui , L. El Fassi , L. Elouadrhiri , S. Fegan , A. Filippi , T. A. Forest , G. Gavalian , G. P. Gilfoyle , F. X. Girod , D. I. Glazier , A. A. Golubenko , R. W. Gothe , Y. Gotra , K. A. Griffioen , M. Guidal , K. Hafidi , H. Hakobyan , M. Hattawy , F. Hauenstein , K. Hicks , A. Hobart , M. Holtrop , D. G. Ireland , E. L. Isupov , H. S. Jo , K. Joo , S. Joosten , D. Keller , M. Khachatryan , A. Khanal , A. Kim , W. Kim , A. Kripko , V. Kubarovsky , S. E. Kuhn , L. Lanza , M. Leali , S. Lee , P. Lenisa , K. Livingston , I. J. D. MacGregor , D. Marchand , N. Markov , L. Marsicano , V. Mascagna , B. McKinnon , Z. E. Meziani , M. Mirazita , V. Mokeev , A Movsisyan , C. Munoz Camacho , P. Nadel-Turonski , P. Naidoo , S. Nanda , K. Neupane , S. Niccolai , G. Niculescu , T. R. O'Connell , M. Osipenko , M. Paolone , L. L. Pappalardo , R. Paremuzyan , E. Pasyuk , W. Phelps , O. Pogorelko , Y. Prok , B. A. Raue , M. Ripani , J. Ritman , A. Rizzo , P. Rossi , J. Rowley , F. Sabatié , C. Salgado , A. Schmidt , E. P. Segarra , Y. G. Sharabian , U. Shrestha , D. Sokhan , O. Soto , N. Sparveris , S. Stepanyan , I. I. Strakovsky , S. Strauch , A. Thornton , N. Tyler , R. Tyson , M. Ungaro , L. Venturelli , H. Voskanyan , E. Voutier , D. P. Watts , K. Wei , X. Wei , M. H. Wood , B. Yale , N. Zachariou , J. Zhang

Nucleon spin structure

This paper contains three parts relating to the nucleon spin structure in a simple picture of the nucleon: (i) The polarized gluon distribution in the proton is dynamically predicted starting from a low scale by using a nonlinear QCD…

High Energy Physics - Phenomenology · Physics 2015-10-14 Wei Zhu , Jianhong Ruan

Transverse Spin Structure of the Nucleon through Target Single Spin Asymmetry in Semi-Inclusive Deep-Inelastic $(e,e^\prime \pi^\pm)$ Reaction at Jefferson Lab

Jefferson Lab (JLab) 12 GeV energy upgrade provides a golden opportunity to perform precision studies of the transverse spin and transverse-momentum-dependent structure in the valence quark region for both the proton and the neutron. In…

High Energy Physics - Phenomenology · Physics 2011-04-14 H. Gao , L. Gamberg , J. -P. Chen , X. Qian , Y. Qiang , M. Huang , A. Afanasev , M. Anselmino , H. Avakian , G. Cates , E. Chudakov , E. Cisbani , C. de Jager , F. Garibaldi , B. T. Hu , X. Jiang , K. S. Kumar , X. M. Li , H. J. Lu , Z. -E. Meziani , B. -Q. Ma , Y. J. Mao , J. -C. Peng , A. Prokudin , M. Schlegel , P. Souder , Z. G. Xiao , Y. Ye , L. Zhu

Implication of the proton electric FF space-like behavior puzzle in various physical phenomena

By means of the 10-resonance unitary and analytic model of nucleon electromagnetic structure it is demonstrated that the JLab proton polarization data on the ratio $\mu_p G_{Ep}(Q^2)/G_{Mp}(Q^2)$ are consistent with all form factor…

High Energy Physics - Phenomenology · Physics 2007-08-02 A. Z. Dubnickova , S. Dubnicka

New results on SIDIS SSA from Jefferson Lab

We present studies of single-spin and double-spin asymmetries in semi-inclusive electroproduction of pions using the CEBAF 6 GeV polarized electron beam. Kinematic dependences of single and double spin asymmetries have been measured in a…

Nuclear Experiment · Physics 2014-11-18 H. Avakian , P. Bosted , V. Burkert , L. Elouadrhiri

Measurement of Target and Double-spin Asymmetries for the $\vec e\vec p\to e\pi^+ (n)$ Reaction in the Nucleon Resonance Region at Low $Q^2$

We report measurements of target- and double-spin asymmetries for the exclusive channel $\vec e\vec p\to e\pi^+ (n)$ in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries…

Nuclear Experiment · Physics 2016-11-23 X. Zheng , K. P. Adhikari , P. Bosted , A. Deur , V. Drozdov , L. El Fassi , Hyekoo Kang , K. Kovacs , S. Kuhn , E. Long , S. K. Phillips , M. Ripani , K. Slifer , L. C. Smith , D. Adikaram , Z. Akbar , M. J. Amaryan , S. Anefalos Pereira , G. Asryan , H. Avakian , R. A. Badui , J. Ball , N. A. Baltzell , M. Battaglieri , V. Batourine , I. Bedlinskiy , A. S. Biselli , W. J. Briscoe , S. Bültmann , V. D. Burkert , D. S. Carman , A. Celentano , S. Chandavar , G. Charles , J. -P. Chen , T. Chetry , Seonho Choi , G. Ciullo , L. Clark , L. Colaneri , P. L. Cole , N. Compton , M. Contalbrigo , V. Crede , A. D'Angelo , N. Dashyan , R. De Vita , E. De Sanctis , C. Djalali , G. E. Dodge , R. Dupre , H. Egiyan , A. El Alaoui , L. Elouadrhiri , P. Eugenio , E. Fanchini , G. Fedotov , R. Fersch , A. Filippi , J. A. Fleming , N. Gevorgyan , Y. Ghandilyan , G. P. Gilfoyle , K. L. Giovanetti , F. X. Girod , C. Gleason , E. Golovach , R. W. Gothe , K. A. Griffioen , M. Guidal , N. Guler , L. Guo , C. Hanretty , N. Harrison , M. Hattawy , 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 , S. Joosten , D. Keller , G. Khachatryan , M. Khandaker , A. Kim , W. Kim , F. J. Klein , V. Kubarovsky , L. Lanza , P. Lenisa , K. Livingston , I . J . D. MacGregor , N. Markov , B. McKinnon , M. Mirazita , V. Mokeev , A. Movsisyan , E. Munevar , C. Munoz Camacho , G. Murdoch , P. Nadel-Turonski , L. A. Net , A. Ni , S. Niccolai , G. Niculescu , I. Niculescu , M. Osipenko , A. I. Ostrovidov , M. Paolone , R. Paremuzyan , K. Park , E. Pasyuk , P. Peng , S. Pisano , O. Pogorelko , J. W. Price , A. J. R. Puckett , B. A. Raue , A. Rizzo , G. Rosner , P. Rossi , P. Roy , F. Sabatié , C. Salgado , R. A. Schumacher , Y. G. Sharabian , Iu. Skorodumina , G. D. Smith , D. Sokhan , N. Sparveris , I. Stankovic , I. I. Strakovsky , S. Strauch , M. Taiuti , Ye Tian , M. Ungaro , H. Voskanyan , E. Voutier , N. K. Walford , D. P. Watts , X. Wei , L. B. Weinstein , M. H. Wood , N. Zachariou , J. Zhang

Spin Physics at J-PARC

Spin-physics projects at J-PARC are explained by including future possibilities. J-PARC is the most-intense hadron-beam facility in the high-energy region above multi-GeV, and spin physics will be investigated by using secondary beams of…

High Energy Physics - Phenomenology · Physics 2016-03-23 S. Kumano

Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons

A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the…

High Energy Physics - Experiment · Physics 2020-07-16 HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Bacchetta , S. Belostotski , V. Bryzgalov , G. P. Capitani , E. Cisbani , G. Ciullo , M. Contalbrigo , W. Deconinck , R. De Leo , E. De Sanctis , M. Diefenthaler , P. Di Nezza , M. Düren , G. Elbakian , F. Ellinghaus , A. Fantoni , L. Felawka , G. Gavrilov , V. Gharibyan , Y. Holler , A. Ivanilov , H. E. Jackson , S. Joosten , R. Kaiser , G. Karyan , E. Kinney , A. Kisselev , V. Kozlov , P. Kravchenko , L. Lagamba , L. Lapikás , P. Lenisa , W. Lorenzon , S. I. Manaenkov , B. Marianski , H. Marukyan , Y. Miyachi , A. Movsisyan , V. Muccifora , Y. Naryshkin , A. Nass , G. Nazaryan , W. -D. Nowak , L. L. Pappalardo , P. E. Reimer , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , J. Rubin , D. Ryckbosch , A. Schäfer , G. Schnell , B. Seitz , T. -A. Shibata , V. Shutov , M. Statera , A. Terkulov , M. Tytgat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , I. Vilardi , S. Yaschenko , D. Zeiler , B. Zihlmann , P. Zupranski

Measurement of the generalized spin polarizabilities of the neutron in the low $Q^2$ region

Understanding the nucleon spin structure in the regime where the strong interaction becomes truly strong poses a challenge to both experiment and theory. At energy scales below the nucleon mass of about 1 GeV, the intense interaction among…

Nuclear Experiment · Physics 2022-02-25 V. Sulkosky , C. Peng , J. -P. Chen , A. Deur , S. Abrahamyan , K. A. Aniol , D. S. Armstrong , T. Averett , S. L. Bailey , A. Beck , P. Bertin , F. Butaru , W. Boeglin , A. Camsonne , G. D. Cates , C. C. Chang , Seonho Choi , E. Chudakov , L. Coman , J. C Cornejo , B. Craver , F. Cusanno , R. De Leo , C. W. de Jager , J. D. Denton , S. Dhamija , R. Feuerbach , J. M. Finn , S. Frullani , K. Fuoti , H. Gao , F. Garibaldi , O. Gayou , R. Gilman , A. Glamazdin , C. Glashausser , J. Gomez , J. -O. Hansen , D. Hayes , B. Hersman , D. W. Higinbotham , T. Holmstrom , T. B. Humensky , C. E. Hyde , H. Ibrahim , M. Iodice , X. Jiang , L. J. Kaufman , A. Kelleher , K. E. Keister , W. Kim , A. Kolarkar , N. Kolb , W. Korsch , K. Kramer , G. Kumbartzki , L. Lagamba , V. Laine , G. Laveissiere , J. J. Lerose , D. Lhuillier , R. Lindgren , N. Liyanage , H. -J. Lu , B. Ma , D. J. Margaziotis , P. Markowitz , K. McCormick , M. Meziane , Z. -E. Meziani , R. Michaels , B. Moffit , P. Monaghan , S. Nanda , J. Niedziela , M. Niskin , R. Pandolfi , K. D. Paschke , M. Potokar , A. Puckett , V. A. Punjabi , Y. Qiang , R. Ransome , B. Reitz , R. Roche , A. Saha , A. Shabetai , S. Sirca , J. T. Singh , K. Slifer , R. Snyder , P. Solvignon , R. Stringer , R. Subedi , W. A. Tobias , N. Ton , P. E. Ulmer , G. M. Urciuoli , A. Vacheret , E. Voutier , K. Wang , L. Wan , B. Wojtsekhowski , S. Woo , H. Yao , J. Yuan , X. Zhan , X. Zheng , L. Zhu