Related papers: Transversity Physics at Compass

Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

We report the first measurement of the transverse momentum dependence of double spin asymmetries in semi-inclusive production of pions in deep inelastic scattering off the longitudinally polarized proton. Data have been obtained using a…

High Energy Physics - Experiment · Physics 2010-12-28 The CLAS Collaboration , H. Avakian , P. Bosted , V. D. Burkert , L. Elouadrhiri , K. P. Adhikari , M. Aghasyan , M. Amaryan , M. Anghinolfi , H. Baghdasaryan , J. Ball , M. Battaglieri , I. Bedlinskiy , A. S. Biselli , D. Branford , W. J. Briscoe , W. Brooks , D. S. Carman , L. Casey , P. L. Cole , P. Collins , D. Crabb , V. Crede , A. D'Angelo , A. Daniel , N. Dashyan , R. DeVita , E. DeSanctis , A. Deur , B. Dey , S. Dhamija , R. Dickson , C. Djalali , G. Dodge , D. Doughty , R. Dupre , A. ElAlaoui , P. Eugenio , S. Fegan , R. Fersch , T. A. Forest , A. Fradi , M. Y. Gabrielyan , G. Gavalian , N. Gevorgyan , G. P. Gilfoyle , K. L. Giovanetti , F. X. Girod , W. Gohn , R. W. Gothe , K. A. Griffioen , M. Guidal , N. Guler , L. Guo , K. Hafidi , H. Hakobyan , C. Hanretty , N. Hassall , D. Heddle , K. Hicks , M. Holtrop , Y. Ilieva , D. G. Ireland , E. L. Isupov , S. S. Jawalkar , H. S. Jo , K. Joo , D. Keller , M. Khandaker , P. Khetarpal , W. Kim , A. Klein , F. J. Klein , P. Konczykowski , V. Kubarovsky , S. E. Kuhn , S. V. Kuleshov , V. Kuznetsov , K. Livingston , H. Y. Lu , N. Markov , M. Mayer , J. McAndrew , M. E. McCracken , B. McKinnon , C. A. Meyer , T. Mineeva , M. Mirazita , V. Mokeev , B. Moreno , K. Moriya , B. Morrison , H. Moutarde , E. Munevar , P. Nadel-Turonski , R. Nasseripour , S. Niccolai , G. Niculescu , I. Niculescu , M. R. Niroula , M. Osipenko , A. I. Ostrovidov , R. Paremuzyan , K. Park , S. Park , E. Pasyuk , S. Anefalos Pereira , Y. Perrin , S. Pisano , O. Pogorelko , J. W. Price , S. Procureur , Y. Prok , D. Protopopescu , B. A. Raue , G. Ricco , M. Ripani , G. Rosner , P. Rossi , F. Sabatié , M. S. Saini , J. Salamanca , C. Salgado , R. A. Schumacher , E. Seder , H. Seraydaryan , Y. G. Sharabian , D. I. Sober , D. Sokhan , S. S. Stepanyan , S. Stepanyan , P. Stoler , S. Strauch , R. Suleiman , M. Taiuti , D. J. Tedeschi , S. Tkachenko , M. Ungaro , B . Vernarsky , M. F. Vineyard , E. Voutier , D. P. Watts , L. B. Weinstein , D. P. Weygand , M. H. Wood , J. Zhang , B. Zhao , Z. W. Zhao

First measurement of interference fragmentation on a transversely polarized hydrogen target

The HERMES experiment has measured for the first time single target-spin asymmetries in semi-inclusive two-pion production using a transversely polarized hydrogen target. These asymmetries are related to the product of two unknowns, the…

High Energy Physics - Experiment · Physics 2019-08-14 P. B. van der Nat

Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS

The longitudinal polarisation transfer from muons to lambda and anti-lambda hyperons, D_LL, has been studied in deep inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to lambda…

High Energy Physics - Experiment · Physics 2009-11-05 The COMPASS Collaboration , M. Alekseev

Transverse Structure of Hadrons

Parton distributions in impact parameter space, which are obtained by Fourier transforming GPDs, exhibit a significant deviation from axial symmetry when the target and/or quark are transversely polarized. Connections between this…

High Energy Physics - Phenomenology · Physics 2015-05-20 Matthias Burkardt

Transversity and Collins Fragmentation Functions: Towards a New Global Analysis

A new, preliminary global analysis of the experimental data on azimuthal asymmetries in SIDIS from HERMES and COMPASS collaborations, and in e+e- --> h_1 h_2 X processes from the BELLE collaboration, is performed. The new data allow for a…

High Energy Physics - Phenomenology · Physics 2015-05-13 M. Anselmino , M. Boglione , U. D'Alesio , A. Kotzinian , S. Melis , F. Murgia , A. Prokudin , C. Turk

Transverse spin correlation of back-to-back dihadron in unpolarized collisions

The spin correlation of back-to-back dihadron emerges in unpolarized high-energy collision, empowering unpolarized experiments to shed light on the spin-dependent fragmentation functions. This work investigates the transverse spin…

High Energy Physics - Phenomenology · Physics 2025-03-18 Lei Yang , Yu-Kun Song , Shu-Yi Wei

Quark and Gluon Sivers Functions

The physics of hadron single transverse spin asymmetries is discussed. Possible measurements of both the quark and gluon Sivers functions are proposed.

High Energy Physics - Phenomenology · Physics 2017-08-23 Ivan Schmidt

Single spin asymmetries in inclusive high energy hadron-hadron collision processes

It has been realized for quite a long time that single-spin experiments, in which one of the colliding objects is transversely polarized, can be helpful in studying the properties of strong interaction in general and in testing Quantum…

High Energy Physics - Phenomenology · Physics 2009-10-31 Zuo-tang Liang , C. Boros

Transverse Lambda polarization in unpolarized semi-inclusive DIS

The long-standing problem of transverse Lambda polarization in high-energy collisions of unpolarized hadrons can be tackled by considering new, spin and k_T-dependent quark fragmentation functions for an unpolarized quark into a polarized,…

High Energy Physics - Phenomenology · Physics 2015-06-25 M. Anselmino , D. Boer , U. D'Alesio , F. Murgia

Semi-Inclusive $\pi_0$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS

We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered…

Nuclear Experiment · Physics 2018-06-20 S. Jawalkar , S. Koirala , H. Avakian , P. Bosted , K. A. Griffioen , C. Keith , S. E. Kuhn , K. P. Adhikari , S. Adhikari , D. Adikaram , Z. Akbar , M. J. Amaryan , S. Anefalos Pereira , H. Avakian , J. Ball , N. A. Baltzell , M. Battaglieri , V. Batourine , I. Bedlinskiy , A. S. Biselli , S. Boiarinov , W. J. Briscoe , J. Brock , W. K. Brooks , S. Bultmann , V. D. Burkert , Frank Thanh Cao , C. Carlin , 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 , R. De Vita , E. De Sanctis , M. Defurne , A. Deur , C. Djalali , G. Ddoge , R. Dupre , H. Egiyan , A. El Alaoui , L. El Fassi , L. Elouadrhiri , P. Eugenio , G. Fedotov , S. Fegan , R. Fersch , A. Filippi , J. A. Fleming , T. A. Forest , A. Fradi , M. Garcon , Y. Ghandilyan , G. P. Gilfoyle , K. L. Giovanetti , F. X. Girod , C. Gleason , W. Gohn , E. Golovatch , R. W. Gothe , M. Guidal , N. Guler , L. Guo , H. Hakobyan , C. Hanretty , N. Harrison , M. Hattawy , D. Heddle , K. Hicks , G. Hollis , M. Holtrop , S. M. Hughes , Y. Ilieva , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , D. Jenkins , 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. 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 , T. Mineeva , M. Mirazita , V. Mokeev , R. A. Montgomery , A Movsisyan , C. Munoz Camacho , P. Nadel-Turonski , L. A. Net , S. Niccolai , G. Niculescu , I. Niculescu , M. Osipenko , A. I. Ostrovidov , R. Paremuzyan , K. Park , E. Pasyuk , E. Phelps , W. Phelps , J. Pierce , S. Pisano , O. Pogorelko , J. W. Price , Y. Prok , D. Protopopescu , B. A. Raue , M. Ripani , D. Riser , A. Rizzo , G. Rosner , P. Rossi , F. Sabatie , C. Salgado , R. A. Schumacher , E. Seder , Y. G. Sharabian , A. Simonyan , Iu. Skorodumina , G. D. Smith , D. I. Sober , D. Sokhan , N. Sparveris , I. Stankovic , S. Strauch , M. Taiuti , M. Ungaro , H. Voskanyan , E. Voutier , N. K. Walford , D. P. Watts , X. Wei , L. B. Weinstein , M. H. Wood , N. Zachariou , J. Zhang , Z. W. Zhao

Hard Quasi-real Photo-production of Charged Hadrons at COMPASS energies

The Common Muon Proton Apparatus for Structure and Spectroscopy (COMPASS) at CERN with its use of beams of naturally polarized muons scattered of a polarized deuteron target, provides an environment of hard scattering between quasi-real…

High Energy Physics - Experiment · Physics 2019-08-14 Astrid Morréale

Multidimensional, high precision measurements of beam single spin asymmetries in semi-inclusive $\pi^{+}$ electroproduction off protons in the valence region

High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6~GeV incident electron beam and the CLAS12 spectrometer at…

High Energy Physics - Experiment · Physics 2022-02-23 S. Diehl , A. Kim , G. Angelini , K. Joo , S. Adhikari , M. Amaryan , M. Arratia , H. Atac , H. Avakian , C. Ayerbe Gayoso , N. A. Baltzell , L. Barion , S. Bastami , M. Battaglieri , I. Bedlinskiy , F. Benmokhtar , A. Bianconi , A. S. Biselli , M. Bondi , F. Bossu , S. Boiarinov , K. -T. Brinkmann , W. J. Briscoe , W. Brooks , D. Bulumulla , V. D. Burkert , D. S. Carman , J. C. Carvajal , A. Celentano , P. Chatagnon , T. Chetry , G. Ciullo , L. Clark , B. A. Clary , P. L. Cole , M. Contalbrigo , G. Costantini , V. Crede , A. D'Angelo , N. Dashyan , R. De Vita , M. Defurne , A. Deur , C. Dilks , C. Djalali , M. Dugger , R. Dupre , M. Ehrhart , A. El Alaoui , L. El Fassi , L. Elouadrhiri , S. Fegan , A. Filippi , T. 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 , T. B. Hayward , D. Heddle , K. Hicks , A. Hobart , M. Holtrop , C. E. Hyde , D. G. Ireland , E. L. Isupov , H. S. Jo , R. Johnston , S. Joosten , D. Keller , M. Khachatryan , A. Khanal , W. Kim , A. Kripko , V. Kubarovsky , S. E. Kuhn , L. Lanza , M. Leali , S. Lee , P. Lenisa , K. Livingston , Z. Lu , I. J. D. MacGregor , D. Marchand , N. Markov , L. Marsicano , V. Mascagna , B. McKinnon , Z. E. Meziani , R. G. Milner , T. Mineeva , M. Mirazita , V. Mokeev , P. Moran , A. Movsisyan , C. Munoz Camacho , P. Nadel-Turonski , P. Naidoo , 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 , A. Prokudin , B. A. Raue , M. Ripani , J. Ritman , A. Rizzo , C. D. Roberts , P. Rossi , J. Rowley , F. Sabatie , C. Salgado , A. Schmidt , E. P. Segarra , Y. G. Sharabian , U. Shrestha , P. Simmerling , D. Sokhan , O. Soto , N. Sparveris , S. Stepanyan , P. Stoler , I. I. Strakovsky , S. Strauch , K. Tezgin , A. Thornton , N. Tyler , R. Tyson , M. Ungaro , L. Venturelli , H. Voskanyan , A. Vossen , E. Voutier , D. P. Watts , K. Wei , X. Wei , S. -S. Xu , B. Yale , N. Zachariou , J. Zhang

Probing the transverse spin of quarks in deep inelastic scattering

To identify some way to measure the quark transversity, this thesis analyzes one-particle and two-particle inclusive deep inelastic scattering, where one and two of the outgoing hadrons are detected in coincidence with the electron. It is…

High Energy Physics - Phenomenology · Physics 2009-09-29 A. Bacchetta

Probing transverse quark polarization in deep-inelastic leptoproduction

The azimuthal dependence of hadrons produced in lepton scattering off a polarized hadron probes the quark transverse-spin distributions. In the calculation of the asymmetries, transverse momenta of quarks in the distribution and…

High Energy Physics - Phenomenology · Physics 2011-07-19 R. D. Tangerman , P. J. Mulders

Measurement of Sivers Asymmetries for Di-jets in \sqrt{s}=200 GeV pp Collisions at STAR

Measurement of the transverse spin dependence of the di-jet opening angle in pp collisions at sqrt{s}=200 GeV has been performed by the STAR collaboration. An analyzing power consistent with zero has been observed over a broad range in…

High Energy Physics - Experiment · Physics 2008-11-26 J. Balewski

Transverse spin asymmetries at the EIC as a probe of anomalous electric and magnetic dipole moments

We show that inclusive single-spin asymmetries (SSAs) with transversely polarized protons or electrons at a future electron ion collider (EIC) are sensitive to new physics contributions to electroweak dipole operators of electrons and…

High Energy Physics - Phenomenology · Physics 2023-05-03 Radja Boughezal , Daniel de Florian , Frank Petriello , Werner Vogelsang

Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^2$ with CLAS and Extraction of the Neutron Contribution

We present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with energies of 1.6, 2.5, 4.2 and 5.8 GeV were scattered from…

Nuclear Experiment · Physics 2015-11-11 N. Guler , R. G. Fersch , S. E. Kuhn , P. Bosted , K. A. Griffioen , C. Keith , R. Minehart , Y. Prok , K. P. Adhikari , D. Adikaram , M. J. Amaryan , M. D. Anderson , S. Anefalos Pereira , J. Ball , M. Battaglieri , V. Batourine , I. Bedlinskiy , W. J. Briscoe , W. K. Brooks , S. Bultmann , V. D. Burkert , D. S. Carman , A. Celentano , S. Chandavar , G. Charles , L. Colaneri , P. L. Cole , M. Contalbrigo , D. Crabb , V. Crede , A. D Angelo , N. Dashyan , A. Deur , C. Djalali , G. E. Dodge , R. Dupre , A. El Alaoui , L. El Fassi , L. Elouadrhiri , P. Eugenio , G. Fedotov , S. Fegan , A. Filippi , J. A. Fleming , T. A. Forest , B. Garillon , M. Garcon , N. Gevorgyan , G. P. Gilfoyle , K. L. Giovanetti , F. X. Girod , J. T. Goetz , E. Golovatch , R. W. Gothe , M. Guidal , L. Guo , K. Hafidi , H. Hakobyan , N. Harrison , M. Hattawy , K. Hicks , D. Ho , M. Holtrop , S. M. Hughes , C. E. Hyde , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , H. S. Jo , K. Joo , S. Joosten , D. Keller , M. Khandaker , A. Kim , W. Kim , A. Klein , F. J. Klein , V. Kubarovsky , S. V. Kuleshov , K. Livingston , H. Y. Lu , I. J. D. MacGregor , B. McKinnon , M. Mirazita , V. Mokeev , R. A. Montgomery , A Movsisyan , C. Munoz Camacho , P. Nadel-Turonski , L. A. Net , I. Niculescu , M. Osipenko , A. I. Ostrovidov , K. Park , E. Pasyuk , S. Pisano , O. Pogorelko , J. W. Price , S. Procureur , M. Ripani , A. Rizzo , G. Rosner , P. Rossi , P. Roy , F. Sabatie , C. Salgado , D. Schott , R. A. Schumacher , E. Seder , A. Simonyan , Iu. Skorodumina , D. Sokhan , N. Sparveris , I. I. Strakovsky , S. Strauch , V. Sytnik , Ye Tian , S. Tkachenko , M. Ungaro , E. Voutier , N. K. Walford , X. Wei , L. B. Weinstein , M. H. Wood , N. Zachariou , L. Zana , J. Zhang , Z. W. Zhao , I. Zonta

Transversity measurements at HERMES

Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of charged pions in deep-inelastic scattering (DIS) of positrons on a transversely polarised hydrogen target are presented. Azimuthal moments for both the Collins…

High Energy Physics - Experiment · Physics 2009-11-11 Markus Diefenthaler

Single Spin Asymmetries in Charged Kaon Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized $^3{\rm{He}}$ Target

We report the first measurement of target single spin asymmetries of charged kaons produced in semi-inclusive deep inelastic scattering of electrons off a transversely polarized $^3{\rm{He}}$ target. Both the Collins and Sivers moments,…

Nuclear Experiment · Physics 2014-11-05 Y. X. Zhao , Y. Wang , K. Allada , K. Aniol , J. R. M. Annand , T. Averett , F. Benmokhtar , W. Bertozzi , P. C. Bradshaw , P. Bosted , A. Camsonne , M. Canan , G. D. Cates , C. Chen , J. -P. Chen , W. Chen , K. Chirapatpimol , E. Chudakov , E. Cisbani , J. C. Cornejo , F. Cusanno , M. M. Dalton , W. Deconinck , C. W. de Jager , R. De Leo , X. Deng , A. Deur , H. Ding , P. A. M. Dolph , C. Dutta , D. Dutta , L. El Fassi , S. Frullani , H. Gao , F. Garibaldi , D. Gaskell , S. Gilad , R. Gilman , O. Glamazdin , S. Golge , L. Guo , D. Hamilton , O. Hansen , D. W. Higinbotham , T. Holmstrom , J. Huang , M. Huang , H. F Ibrahim , M. Iodice , X. Jiang , G. Jin , M. K. Jones , J. Katich , A. Kelleher , W. Kim , A. Kolarkar , W. Korsch , J. J. LeRose , X. Li , Y. Li , R. Lindgren , N. Liyanage , E. Long , H. -J. Lu , D. J. Margaziotis , P. Markowitz , S. Marrone , D. McNulty , Z. -E. Meziani , R. Michaels , B. Moffit , C. Muñoz Camacho , S. Nanda , A. Narayan , V. Nelyubin , B. Norum , Y. Oh , M. Osipenko , D. Parno , J. -C. Peng , S. K. Phillips , M. Posik , A. J. R. Puckett , X. Qian , Y. Qiang , A. Rakhman , R. Ransome , S. Riordan , A. Saha , B. Sawatzky , E. Schulte , A. Shahinyan , M. H. Shabestari , S. Širca , S. Stepanyan , R. Subedi , V. Sulkosky , L. -G. Tang , A. Tobias , G. M. Urciuoli , I. Vilardi , K. Wang , B. Wojtsekhowski , X. Yan , H. Yao , Y. Ye , Z. Ye , L. Yuan , X. Zhan , Y. Zhang , Y. -W. Zhang , B. Zhao , X. Zheng , L. Zhu , X. Zhu , X. Zong

Pion Polarizabilities and Hybrid Meson Structure at CERN COMPASS

CERN COMPASS can investigate pion-photon interactions, to achieve a unique Primakoff Coulomb physics program, centered on pion polarizability and hybrid meson structure studies. COMPASS uses 100-280 GeV beams (muon, pion) and a virtual…

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