Related papers: Transverse Spin Effects at COMPASS

SIDIS transverse spin azimuthal asymmetries at COMPASS: Multidimensional analysis

Exploration of transverse spin structure of the nucleon via study of the spin (in)dependent azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS) and Drell-Yan (DY) reactions is one of the main aspects of the broad…

High Energy Physics - Experiment · Physics 2015-12-23 Bakur Parsamyan

Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries

The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV positive muon beam and a transversely polarised NH_3 target. The…

High Energy Physics - Experiment · Physics 2015-06-05 C. Adolph , M. G. Alekseev , V. Yu. Alexakhin , Yu. Alexandrov , G. D. Alexeev , A. Amoroso , A. A. Antonov , A. Austregesilo , B. Badelek , F. Balestra , J. Barth , G. Baum , Y. Bedfer , J. Bernhard , R. Bertini , M. Bettinelli , K. Bicker , J. Bieling , R. Birsa , J. Bisplinghoff , P. Bordalo , F. Bradamante , C. Braun , A. Bravar , A. Bressan , E. Burtin , L. Capozza , M. Chiosso , S. U. Chung , A. Cicuttin , M. L. Crespo , S. Dalla Torre , S. Das , S. S. Dasgupta , S. Dasgupta , O. Yu. Denisov , L. Dhara , S. V. Donskov , N. Doshita , V. Duic , W. Duennweber , M. Dziewiecki , A. Efremov , C. Elia , P. D. Eversheim , W. Eyrich , M. Faessler , A. Ferrero , A. Filin , M. Finger , M. Finger , H. Fischer , C. Franco , N. du Fresne von Hohenesche , J. M. Friedrich , V. Frolov , R. Garfagnini , F. Gautheron , O. P. Gavrichtchouk , S. Gerassimov , R. Geyer , M. Giorgi , I. Gnesi , B. Gobbo , S. Goertz , S. Grabmueller , A. Grasso , B. Grube , R. Gushterski , A. Guskov , T. Guthoerl , F. Haas , D. von Harrach , F. H. Heinsius , F. Herrmann , C. Hess , F. Hinterberger , N. Horikawa , Ch. Hoeppner , N. d'Hose , S. Ishimoto , O. Ivanov , Yu. Ivanshin , T. Iwata , R. Jahn , V. Jary , P. Jasinski , R. Joosten , E. Kabuss , D. Kang , B. Ketzer , G. V. Khaustov , Yu. A. Khokhlov , Yu. Kisselev , F. Klein , K. Klimaszewski , S. Koblitz , J. H. Koivuniemi , V. N. Kolosov , K. Kondo , K. Koenigsmann , I. Konorov , V. F. Konstantinov , A. Korzenev , A. M. Kotzinian , O. Kouznetsov , M. Kraemer , Z. V. Kroumchtein , F. Kunne , K. Kurek , L. Lauser , A. A. Lednev , A. Lehmann , S. Levorato , J. Lichtenstadt , T. Liska , A. Maggiora , A. Magnon , N. Makke , G. K. Mallot , A. Mann , C. Marchand , A. Martin , J. Marzec , T. Matsuda , G. Meshcheryakov , W. Meyer , T. Michigami , Yu. V. Mikhailov , M. A. Moinester , A. Morreale , A. Mutter , A. Nagaytsev , T. Nagel , T. Negrini , F. Nerling , S. Neubert , D. Neyret , V. I. Nikolaenko , W. D. Nowak , A. S. Nunes , A. G. Olshevsky , M. Ostrick , A. Padee , R. Panknin , D. Panzieri , B. Parsamyan , S. Paul , E. Perevalova , G. Pesaro , D. V. Peshekhonov , G. Piragino , S. Platchkov , J. Pochodzalla , J. Polak , V. A. Polyakov , J. Pretz , M. Quaresma , C. Quintans , J. -F. Rajotte , S. Ramos , V. Rapatsky , G. Reicherz , A. Richter , E. Rocco , E. Rondio , N. S. Rossiyskaya , D. I. Ryabchikov , V. D. Samoylenko , A. Sandacz , M. G. Sapozhnikov , S. Sarkar , I. A. Savin , G. Sbrizzai , P. Schiavon , C. Schill , T. Schlueter , K. Schmidt , L. Schmitt , K. Schoenning , S. Schopferer , M. Schott , W. Schroeder , O. Yu. Shevchenko , L. Silva , L. Sinha , A. N. Sissakian , M. Slunecka , G. I. Smirnov , S. Sosio , F. Sozzi , A. Srnka , L. Steiger , M. Stolarski , M. Sulc , R. Sulej , H. Suzuki , P. Sznajder , S. Takekawa , J. Ter Wolbeek , S. Tessaro , F. Tessarotto , L. G. Tkatchev , S. Uhl , I. Uman , M. Vandenbroucke , M. Virius , N. V. Vlassov , L. Wang , M. Wilfert , R. Windmolders , W. Wislicki , H. Wollny , K. Zaremba , M. Zavertyaev , E. Zemlyanichkina , M. Ziembicki , N. Zhuravlev , A. Zvyagin

Measurement of $\mathbf{q_T}$-weighted transverse-spin-dependent azimuthal asymmetries at COMPASS

COMPASS is a fixed-target experiment in operation at the CERN North Area (SPS, M2 beam-line) since 2002. An important part of the broad physics programme of the experiment is dedicated to the exploration of the transverse spin-structure of…

High Energy Physics - Experiment · Physics 2019-08-15 Riccardo Longo

Transversity and $\Lambda$ polarization at COMPASS

The study of $\Lambda$ polarization in Semi-Inclusive Deep Inelastic Scattering (SIDIS) with a transversely polarized target has often been suggested as a privileged way to access transversity, as the initial quark polarization can be…

High Energy Physics - Experiment · Physics 2019-01-08 Andrea Moretti

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

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

Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering

A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised $^6$LiD (deuteron) and NH$_3$ (proton) targets is presented. All available data…

High Energy Physics - Experiment · Physics 2023-01-06 The COMPASS Collaboration

First measurements of Collins and Sivers asymmetries at COMPASS

COMPASS is a fixed-target experiment on the SPS M2 beamline at CERN. Its LiD target can be polarised both longitudinally and transversally with respect to the longitudinally polarised 160 GeV/c muon beam. Approximately 20% of the beam-time…

High Energy Physics - Experiment · Physics 2015-06-25 Richard Webb

Study of the Transverse-Momentum-Dependent structure of the nucleon in Semi-Inclusive DIS

The aim of this Thesis is to contribute to the understanding of the nucleon structure through the study of two observables accessible in Semi-Inclusive Deep Inelastic Scattering (SIDIS) of high energy leptons off unpolarized protons: the…

High Energy Physics - Experiment · Physics 2021-09-20 Andrea Moretti

First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process

The COMPASS experiment at CERN, as part of its programme addresses the exploration of the transverse spin structure of the nucleon by measuring spin (in)dependent azimuthal asymmetries in semi-inclusive DIS and, recently, also in Drell-Yan…

High Energy Physics - Experiment · Physics 2018-01-08 Bakur Parsamyan

The future SIDIS measurement on transversely polarized deuterons by the COMPASS Collaboration

Since 2005, measurements of Collins and Sivers asymmetries from the HERMES and COMPASS experiments have allowed to assess that the transversity and the Sivers PDFs are different from zero and measurable in semi-inclusive DIS on transversely…

High Energy Physics - Experiment · Physics 2018-12-19 F. Bradamante

Measurement of the transverse target-spin asymmetry associated with deeply virtual Compton scattering on the proton

Measurements of deeply virtual Compton scattering (DVCS) made at HERMES using 27.6 GeV $e^\pm$ beams and various internal polarized or unpolarized gaseous targets are discussed. Results are reported on the transverse target-spin asymmetry…

High Energy Physics - Experiment · Physics 2007-05-23 Zhenyu Ye

Beyond Collins and Sivers: further measurements of the target transverse spin-dependent azimuthal asymmetries in semi-inclusive DIS from COMPASS

In semi-inclusive DIS of polarized leptons on a transversely polarized target eight azimuthal modulations appear in the cross-section. Within QCD parton model four azimuthal asymmetries can be interpreted at leading order, two of them being…

High Energy Physics - Experiment · Physics 2007-05-23 Aram Kotzinian

Transversely polarized Drell-Yan measurements at COMPASS

The exploration of the transverse spin structure of the nucleon by measuring spin (in)dependent azimuthal asymmetries in semi-inclusive DIS (SIDIS) and in Drell-Yan processes is one of the main objectives of the COMPASS experiment at CERN…

High Energy Physics - Experiment · Physics 2019-08-08 Bakur Parsamyan

Measurement of longitudinal-target-polarization dependent azimuthal asymmetries in SIDIS at COMPASS experiment

Preliminary results obtained by the COMPASS experiment for longitudinal-spin-dependent azimuthal asymmetries in single-hadron muoproduction off protons are presented for the first time. The analysis was carried out on the full data sample…

High Energy Physics - Experiment · Physics 2018-01-08 Bakur Parsamyan

Physics Results from COMPASS

The COMPASS Experiment at the CERN SPS has a broad physics program focused on the nucleon spin structure and on hadron spectroscopy, using muon and hadron beams. Main objectives for the spin program with the muon beam are the direct…

High Energy Physics - Experiment · Physics 2017-08-23 A. Bressan

Measurements of Unpolarized Azimuthal Asymmetries at COMPASS

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

High Energy Physics - Experiment · Physics 2019-08-13 W. Käfer

Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ GeV/c and a $^6$LiD target. The amplitudes of the three…

High Energy Physics - Experiment · Physics 2015-06-18 C. Adolph , R. Akhunzyanov , M. G. Alekseev , Yu. Alexandrov , G. D. Alexeev , A. Amoroso , V. Andrieux , V. Anosov , A. Austregesilo , B. Badelek , F. Balestra , J. Barth , G. Baum , R. Beck , Y. Bedfer , A. Berlin , J. Bernhard , R. Bertini , K. Bicker , J. Bieling , R. Birsa , J. Bisplinghoff , M. Bodlak , M. Boer , P. Bordalo , F. Bradamante , C. Braun , A. Bravar , A. Bressan , M. Buechele , E. Burtin , L. Capozza , M. Chiosso , S. U. Chung , A. Cicuttin , M. L. Crespo , Q. Curiel , S. Dalla Torre , S. S. Dasgupta , S. Dasgupta , O. Yu. Denisov , S. V. Donskov , N. Doshita , V. Duic , W. Duennweber , M. Dziewiecki , A. Efremov , C. Elia , P. D. Eversheim , W. Eyrich , M. Faessler , A. Ferrero , A. Filin , M. Finger , M. Finger , H. Fischer , C. Franco , N. du Fresne von Hohenesche , J. M. Friedrich , V. Frolov , R. Garfagnini , F. Gautheron , O. P. Gavrichtchouk , S. Gerassimov , R. Geyer , M. Giorgi , I. Gnesi , B. Gobbo , S. Goertz , M. Gorzellik , S. Grabmueller , A. Grasso , B. Grube , A. Guskov , T. Guthoerl , F. Haas , D. von Harrach , D. Hahne , R. Hashimoto , F. H. Heinsius , F. Herrmann , F. Hinterberger , Ch. Hoeppner , N. Horikawa , N. d'Hose , S. Huber , S. Ishimoto , A. Ivanov , Yu. Ivanshin , T. Iwata , R. Jahn , V. Jary , P. Jasinski , P. Joerg , R. Joosten , E. Kabuss , D. Kang , B. Ketzer , G. V. Khaustov , Yu. A. Khokhlov , Yu. Kisselev , F. Klein , K. Klimaszewski , J. H. Koivuniemi , V. N. Kolosov , K. Kondo , K. Koenigsmann , I. Konorov , V. F. Konstantinov , A. M. Kotzinian , O. Kouznetsov , Z. Kral , M. Kraemer , Z. V. Kroumchtein , N. Kuchinski , F. Kunne , K. Kurek , R. P. Kurjata , A. A. Lednev , A. Lehmann , S. Levorato , J. Lichtenstadt , A. Maggiora , A. Magnon , N. Makke , G. K. Mallot , C. Marchand , A. Martin , J. Marzec , J. Matousek , H. Matsuda , T. Matsuda , G. Meshcheryakov , W. Meyer , T. Michigami , Yu. V. Mikhailov , Y. Miyachi , A. Nagaytsev , T. Nagel , F. Nerling , S. Neubert , D. Neyret , V. I. Nikolaenko , J. Novy , W. -D. Nowak , A. S. Nunes , I. Orlov , A. G. Olshevsky , M. Ostrick , R. Panknin , D. Panzieri , B. Parsamyan , S. Paul , M. Pesek , D. Peshekhonov , G. Piragino , S. Platchkov , J. Pochodzalla , J. Polak , V. A. Polyakov , J. Pretz , M. Quaresma , C. Quintans , S. Ramos , G. Reicherz , E. Rocco , V. Rodionov , E. Rondio , A. Rychter , N. S. Rossiyskaya , D. I. Ryabchikov , V. D. Samoylenko , A. Sandacz , S. Sarkar , I. A. Savin , G. Sbrizzai , P. Schiavon , C. Schill , T. Schlueter , A. Schmidt , K. Schmidt , H. Schmieden , K. Schoenning , S. Schopferer , M. Schott , O. Yu. Shevchenko , L. Silva , L. Sinha , S. Sirtl , M. Slunecka , S. Sosio , F. Sozzi , A. Srnka , L. Steiger , M. Stolarski , M. Sulc , R. Sulej , H. Suzuki , A. Szabeleski , T. Szameitat , P. Sznajder , S. Takekawa , J. ter Wolbeek , S. Tessaro , F. Tessarotto , F. Thibaud , S. Uhl , I. Uman , M. Vandenbroucke , M. Virius , J. Vondra , L. Wang , T. Weisrock , M. Wilfert , R. Windmolders , W. Wislicki , H. Wollny , K. Zaremba , M. Zavertyaev , E. Zemlyanichkina , M. Ziembicki

Transverse Spin Physics at HERMES

HERMES has measured azimuthal single-spin asymmetries of charged pions produced in deep-inelastic scattering of positrons on a transversely polarised hydrogen target. The presented azimuthal moments provide access to two yet unknown quark…

High Energy Physics - Experiment · Physics 2019-08-14 A. Hillenbrand

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