Related papers: Transverse spin effects in COMPASS

Collins Effect from Polarized SIDIS and $e^+e^-$ Data

The recent data on the transverse single spin asymmetry $A_{UT}^{\sin(\phi_h+\phi_S)}$ from HERMES and COMPASS Collaborations are analysed within LO parton model with unintegrated parton distribution and fragmentation functions. A fit of…

High Energy Physics - Phenomenology · Physics 2008-11-26 A. Prokudin , C. Turk

Azimuthal asymmetries in SIDIS di-hadron muoproduction off longitudinally polarized protons at COMPASS

In this review a first comprehensive study of azimuthal asymmetries in semi-inclusive deep inelastic muoproduction of hadron pairs off longitudinally polarized protons at COMPASS is presented. The study is based on data taken in 2007 and…

High Energy Physics - Experiment · Physics 2017-02-24 Stefan Sirtl

Effects of transversity in deep-inelastic scattering by polarized protons

Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the…

High Energy Physics - Experiment · Physics 2014-11-21 HERMES collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan , A. Bacchetta , 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 , U. Elschenbroich , R. Fabbri , A. Fantoni , L. Felawka , S. Frullani , D. Gabbert , G. Gapienko , V. Gapienko , F. Garibaldi , 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 , A. Izotov , H. E. Jackson , H. S. Jo , S. Joosten , R. Kaiser , G. Karyan , T. Keri , E. Kinney , A. Kisselev , N. Kobayashi , V. Korotkov , V. Kozlov , P. Kravchenko , 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 , Y. Miyachi , A. Movsisyan , M. Murray , 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 , 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 , P. B. van der Nat , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , C. Vogel , S. Wang , S. Yaschenko , H. Ye , Z. Ye , S. Yen , W. Yu , D. Zeiler , B. Zihlmann , P. Zupranski

Compass Results on Gluon Polarisation from High pT hadron pairs

One of the goals of the COMPASS experiment is the determination of the gluon polarisation \Delta G/G, for a deep understanding of the spin structure of the nucleon. In DIS the gluon polarisation can be measured via the Photon-Gluon-Fusion…

High Energy Physics - Experiment · Physics 2019-08-13 L. Silva

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

Neutron spin structure from polarized deuteron DIS with proton tagging

Polarized electron-deuteron deep-inelastic scattering (DIS) with detection of the spectator proton ("tagged DIS") enables measurements of neutron spin structure with maximal control of nuclear effects. We calculate the longitudinal spin…

High Energy Physics - Phenomenology · Physics 2019-11-15 W. Cosyn , C. Weiss

A partonic description of the transverse target single-spin asymmetry in inclusive DIS

The single-spin asymmetry of unpolarized leptons scattering deep-inelastically off transversely polarized nucleons is studied in a partonic picture within a collinear twist-3 framework. Since this observable is generated by multi-photon…

High Energy Physics - Phenomenology · Physics 2013-02-28 Marc Schlegel

Nucleon Spin Structure with hadronic collisions at COMPASS

In order to illustrate the capabilities of COMPASS using a hadronic beam, I review some of the azimuthal asymmetries in hadronic collisions, that allow for the extraction of transversity, Sivers and Boer-Mulders functions, necessary to…

High Energy Physics - Phenomenology · Physics 2007-08-03 Marco Radici , Francesco Conti , Alessandro Bacchetta , Andrea Bianconi

Transversity and Collins functions from SIDIS and e+e- data

A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e+e- --> h1 h2 X processes, from the BELLE Collaboration, is…

High Energy Physics - Phenomenology · Physics 2010-04-06 M. Anselmino , M. Boglione , U. D'Alesio , A. Kotzinian , F. Murgia , A. Prokudin , C. Turk

\Delta G/G results from the COMPASS experiment for Q^2 > 1 GeV^2, using high p_T hadrons

One of the goals of COMPASS experiment is the determination of the gluon polarisation, \Delta G/G, for a deep understanding of the spin structure of the nucleon. The gluon polarisation can be measured via the Photon-Gluon-Fusion (PGF)…

High Energy Physics - Experiment · Physics 2019-08-13 Luís Silva

New measurement of DeltaG/G at COMPASS

One of the main goals of the COMPASS experiment at CERN is the determination of the gluon polarisation in the nucleon, DeltaG/G. It is extracted from the spin asymmetry in the scattering of a polarized 160 GeV muon beam on a polarized LiD…

High Energy Physics - Experiment · Physics 2007-05-23 S. Procureur

Measurements of Transverse Spin Effects with the Forward Pion Detector of STAR

Measurements by the STAR collaboration of neutral pion production at large Feynman x (x_F) in the first polarized proton collisions at $\sqrt{s}=200$ GeV were reported previously. Cross sections measured at $\eta=3.3$, 3.8 and 4.0 are found…

High Energy Physics - Experiment · Physics 2019-08-14 L. Nogach

Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p$^\uparrow$+p collisions at $\sqrt{s}$ = 500 GeV

The transversity distribution, which describes transversely polarized quarks in transversely polarized nucleons, is a fundamental component of the spin structure of the nucleon, and is only loosely constrained by global fits to existing…

High Energy Physics - Experiment · Physics 2018-03-16 STAR Collaboration , L. Adamczyk , J. R. Adams , J. K. Adkins , G. Agakishiev , M. M. Aggarwal , Z. Ahammed , N. N. Ajitanand , I. Alekseev , D. M. Anderson , R. Aoyama , A. Aparin , D. Arkhipkin , E. C. Aschenauer , M. U. Ashraf , A. Attri , G. S. Averichev , X. Bai , V. Bairathi , K. Barish , A. Behera , R. Bellwied , A. Bhasin , A. K. Bhati , P. Bhattarai , J. Bielcik , J. Bielcikova , L. C. Bland , I. G. Bordyuzhin , J. Bouchet , J. D. Brandenburg , A. V. Brandin , D. Brown , J. Bryslawskyj , I. Bunzarov , J. Butterworth , H. Caines , M. Calderón de la Barca Sánchez , J. M. Campbell , D. Cebra , I. Chakaberia , P. Chaloupka , Z. Chang , N. Chankova-Bunzarova , A. Chatterjee , S. Chattopadhyay , X. Chen , J. H. Chen , X. Chen , J. Cheng , M. Cherney , W. Christie , G. Contin , H. J. Crawford , S. Das , T. G. Dedovich , J. Deng , I. M. Deppner , A. A. Derevschikov , L. Didenko , C. Dilks , X. Dong , J. L. Drachenberg , J. E. Draper , J. C. Dunlop , L. G. Efimov , N. Elsey , J. Engelage , G. Eppley , R. Esha , S. Esumi , O. Evdokimov , J. Ewigleben , O. Eyser , R. Fatemi , S. Fazio , P. Federic , P. Federicova , J. Fedorisin , Z. Feng , P. Filip , E. Finch , Y. Fisyak , C. E. Flores , J. Fujita , L. Fulek , C. A. Gagliardi , F. Geurts , A. Gibson , M. Girard , D. Grosnick , D. S. Gunarathne , Y. Guo , A. Gupta , W. Guryn , A. I. Hamad , A. Hamed , A. Harlenderova , J. W. Harris , L. He , S. Heppelmann , S. Heppelmann , N. Herrmann , A. Hirsch , S. Horvat , X. Huang , H. Z. Huang , T. Huang , B. Huang , T. J. Humanic , P. Huo , G. Igo , W. W. Jacobs , A. Jentsch , J. Jia , K. Jiang , S. Jowzaee , E. G. Judd , S. Kabana , D. Kalinkin , K. Kang , D. Kapukchyan , K. Kauder , H. W. Ke , D. Keane , A. Kechechyan , Z. Khan , D. P. Kikoła , C. Kim , I. Kisel , A. Kisiel , L. Kochenda , M. Kocmanek , T. Kollegger , L. K. Kosarzewski , A. F. Kraishan , L. Krauth , P. Kravtsov , K. Krueger , N. Kulathunga , L. Kumar , J. Kvapil , J. H. Kwasizur , R. Lacey , J. M. Landgraf , K. D. Landry , J. Lauret , A. Lebedev , R. Lednicky , J. H. Lee , W. Li , C. Li , X. Li , Y. Li , J. Lidrych , T. Lin , M. A. Lisa , F. Liu , P. Liu , Y. Liu , H. Liu , T. Ljubicic , W. J. Llope , M. Lomnitz , R. S. Longacre , S. Luo , X. Luo , G. L. Ma , R. Ma , Y. G. Ma , L. Ma , N. Magdy , R. Majka , D. Mallick , S. Margetis , C. Markert , H. S. Matis , D. Mayes , K. Meehan , J. C. Mei , Z. W. Miller , N. G. Minaev , S. Mioduszewski , D. Mishra , S. Mizuno , B. Mohanty , M. M. Mondal , D. A. Morozov , M. K. Mustafa , Md. Nasim , T. K. Nayak , J. M. Nelson , D. B. Nemes , M. Nie , G. Nigmatkulov , T. Niida , L. V. Nogach , T. Nonaka , S. B. Nurushev , G. Odyniec , A. Ogawa , K. Oh , V. A. Okorokov , D. Olvitt , B. S. Page , R. Pak , Y. Pandit , Y. Panebratsev , B. Pawlik , H. Pei , C. Perkins , J. Pluta , K. Poniatowska , J. Porter , M. Posik , N. K. Pruthi , M. Przybycien , J. Putschke , A. Quintero , S. Ramachandran , R. L. Ray , R. Reed , M. J. Rehbein , H. G. Ritter , J. B. Roberts , O. V. Rogachevskiy , J. L. Romero , J. D. Roth , L. Ruan , J. Rusnak , O. Rusnakova , N. R. Sahoo , P. K. Sahu , S. Salur , J. Sandweiss , M. Saur , J. Schambach , A. M. Schmah , W. B. Schmidke , N. Schmitz , B. R. Schweid , J. Seger , M. Sergeeva , R. Seto , P. Seyboth , N. Shah , E. Shahaliev , P. V. Shanmuganathan , M. Shao , W. Q. Shen , S. S. Shi , Z. Shi , Q. Y. Shou , E. P. Sichtermann , R. Sikora , M. Simko , S. Singha , M. J. Skoby , N. Smirnov , D. Smirnov , W. Solyst , P. Sorensen , H. M. Spinka , B. Srivastava , T. D. S. Stanislaus , D. J. Stewart , M. Strikhanov , B. Stringfellow , A. A. P. Suaide , T. Sugiura , M. Sumbera , B. Summa , X. Sun , Y. Sun , X. M. Sun , B. Surrow , D. N. Svirida , Z. Tang , A. H. Tang , A. Taranenko , T. Tarnowsky , A. Tawfik , J. Thäder , J. H. Thomas , A. R. Timmins , D. Tlusty , T. Todoroki , M. Tokarev , S. Trentalange , R. E. Tribble , P. Tribedy , S. K. Tripathy , B. A. Trzeciak , O. D. Tsai , B. Tu , T. Ullrich , D. G. Underwood , I. Upsal , G. Van Buren , G. van Nieuwenhuizen , A. N. Vasiliev , F. Videbæk , S. Vokal , S. A. Voloshin , A. Vossen , G. Wang , F. Wang , Y. Wang , Y. Wang , G. Webb , J. C. Webb , L. Wen , G. D. Westfall , H. Wieman , S. W. Wissink , R. Witt , Y. Wu , Z. G. Xiao , G. Xie , W. Xie , Q. H. Xu , Y. F. Xu , J. Xu , N. Xu , Z. Xu , C. Yang , S. Yang , Q. Yang , Y. Yang , Z. Ye , Z. Ye , L. Yi , K. Yip , I. -K. Yoo , N. Yu , H. Zbroszczyk , W. Zha , J. B. Zhang , J. Zhang , S. Zhang , L. Zhang , J. Zhang , X. P. Zhang , Z. Zhang , S. Zhang , Y. Zhang , J. Zhao , C. Zhong , C. Zhou , L. Zhou , X. Zhu , Z. Zhu , M. Zyzak

Nucleon partonic spin structure to be explored by the unpolarized Drell-Yan program of COMPASS experiment at CERN

The observation of the violation of Lam-Tung relation in the $\pi N$ Drell-Yan process triggered many theoretical speculations. The TMD Boer-Mulders functions characterizing the correlation of transverse momentum and transverse spin for…

Nuclear Experiment · Physics 2016-03-23 Wen-Chen Chang

Measurements of unpolarised azimuthal asymmetries at COMPASS

Azimuthal asymmetries in unpolarized SIDIS can be used to probe the transverse momentum of the quarks inside the nucleon. Furthermore they give access to the so-far unmeasured Boer-Mulders function. We report on the extraction of these…

High Energy Physics - Experiment · Physics 2019-08-13 Giulio Sbrizzai

Transverse spin effects and light-quark dipole moments at colliders

In this talk, we present novel methods to investigate light-quark dipole interactions at colliders. Our approach includes: (1) measuring azimuthal asymmetries of a collinear dihadron in semi-inclusive deep inelastic lepton scattering off an…

High Energy Physics - Phenomenology · Physics 2026-03-20 Xin-Kai Wen , Bin Yan , Zhite Yu , C. -P. Yuan

A_N in inclusive lepton-proton collisions

Some estimates for the transverse single spin asymmetry, A_N, in the inclusive processes l p(transv. pol.) -> h X are compared with new experimental data. The calculations are based on the Sivers and Collins functions as extracted from…

High Energy Physics - Phenomenology · Physics 2014-07-16 M. Anselmino , M. Boglione , U. D'Alesio , S. Melis , F. Murgia , A. Prokudin

First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12

We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass…

High Energy Physics - Experiment · Physics 2023-01-25 H. Avakian , T. B. Hayward , A. Kotzinian , W. R. Armstrong , H. Atac , C. Ayerbe Gayoso , L. Baashen , N. A. Baltzell , L. Barion , M. Bashkanov , M. Battaglieri , I. Bedlinskiy , F. Benmokhtar , A. Bianconi , L. Biondo , A. S. Biselli , M. Bondi , S. Boiarinov , F. Bossù , K. T. Brinkman , W. J. Briscoe , W. K. Brooks , S. Bueltmann , D. Bulumulla , V. D. Burkert , R. Capobianco , D. S. Carman , J. C. Carvajal , A. Celentano , P. Chatagnon , V. Chesnokov , T. Chetry , G. Ciullo , P. L. Cole , M. Contalbrigo , G. Costantini , A. D'Angelo , N. Dashyan , R. De Vita , M. Defurne , A. Deur , S. Diehl , C. Dilks , C. Djalali , R. Dupre , H. Egiyan , A. El Alaoui , L. El Fassi , L. Elouadrhiri , S. Fegan , A. Filippi , T. Forest , K. Gates , G. Gavalian , Y. Gilyan , D. I. Glazier , A. A. Golubenko , G. Gosta , R. W. Gothe , Y. Gotra , K. A. Griffioen , M. Guidal , H. Hakobyan , M. Hattawy , F. Hauenstein , D. Heddle , A. Hobart , M. Holtrop , C. E. Hyde , Y. Ilieva , D. G. Ire , E. L. Isupov , H. S. Jo , R. Johnston , K. Joo , M. L. Kabir , D. Keller , M. Khachatryan , A. Khanal , A. Kim , W. Kim , V. Klimenko , A. Kripko , V. Kubarovsky , S. E. Kuhn , V. Lagerquist , L. Lanza , M. Leali , S. Lee , P. Lenisa , X. Li , I . J . D. MacGregor , D. Marc , V. Mascagna , B. McKinnon , S. Migliorati , T. Mineeva , M. Mirazita , V. Mokeev , R. A. Montgomery , C. Munoz Camacho , P. Nadel-Turonski , P. Naidoo , K. Neupane , D. Nguyen , S. Niccolai , M. Nicol , G. Niculescu , M. Osipenko , P. Pandey , M. Paolone , L. L. Pappalardo , R. Paremuzyan , E. Pasyuk , S. J. Paul , W. Phelps , N. Pilleux , O. Pogorelko , M. Pokhrel , J. Poudel , J. W. Price , Y. Prok , B. A. Raue , T. Reed , J. Richards , M. Ripani , J. Ritman , P. Rossi , F. Sabatié , 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 , J. A. Tan , N. Trotta , R. Tyson , M. Ungaro , S. Vallarino , L. Venturelli , H. Voskanyan , A. Vossen , E. Voutier , D. P. Watts , X. Wei , R. Wishart , M. H. Wood , N. Zachariou , Z. W. Zhao , M. Zurek

Weighted transverse spin asymmetries in 2015 COMPASS Drell-Yan data

Muon pairs created in the Drell-Yan process of a negative pion beam of 190 GeV/c momentum impinging on a transversely polarised NH$_3$ target were detected with the COMPASS spectrometer at CERN in 2015. In addition to the extraction of the…

High Energy Physics - Experiment · Physics 2018-12-21 Jan Matousek

Kinematical contributions to the transverse asymmetry in semi-inclusive DIS

We discuss the contributions of the transverse spin component of the target to the double-spin asymmetries in semi-inclusive deep inelastic scattering of longitudinally polarized electrons off longitudinally polarized protons.

High Energy Physics - Phenomenology · Physics 2009-11-07 K. A. Oganessyan , P. J. Mulders , E. De Sanctis , L. S. Asilyan