Related papers: Single spin asymmetries in l p --> h + X processes

Single Transverse Spin Asymmetries at Parton Level

Two factorization approaches have been proposed for single transverse spin asymmetries. One is the collinear factorization, another is the transverse-momentum-dependent factorization. They have been previously derived in a formal way by…

High Energy Physics - Phenomenology · Physics 2014-11-18 H. G. Cao , J. P. Ma , H. Z. Sang

Single Spin Asymmetry in Lepton Angular Distribution of Drell-Yan Processes

We study the single spin asymmetry in the lepton angular distribution of Drell-Yan processes in the frame work of collinear factorization. The asymmetry has been studied in the past and different results have been obtained. In our study we…

High Energy Physics - Phenomenology · Physics 2015-06-04 J. P. Ma , G. P. Zhang

Single Transverse Spin Asymmetry in $p^\uparrow p \to \pi X$ and $ep^\uparrow \to \pi X$

Single transverse spin asymmetry for the pion production in pp and ep collisions is studied in the framework of collinear factorization. The soft-gluon pole contributions with twist-3 distribution and fragmentation functions are identified…

High Energy Physics - Phenomenology · Physics 2009-11-07 Yuji Koike

Single Transverse Spin Asymmetry for Large-p_T Pion Production in Semi-Inclusive Deep Inelastic Scattering

We study the single spin asymmetry (SSA) for the pion production with large transverse momentum p_T in semi-inclusive deep inelastic scattering $ep^\uparrow\to e\pi X$. We derive the twist-3 cross section formula for SSA, focussing on the…

High Energy Physics - Phenomenology · Physics 2008-11-26 Hisato Eguchi , Yuji Koike , Kazuhiro Tanaka

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

Theoretical Update of Twist-3 Single-Spin Asymmetry in Semi-Inclusive DIS

We discuss the single-spin asymmetry in semi-inclusive DIS, $e p^\uparrow \to e \pi X$, based on the twist-3 mechanism in the collinear factorization relevant for the pion production with the large transverse-momentum. This updates our…

High Energy Physics - Phenomenology · Physics 2009-07-17 Yuji Koike , Kazuhiro Tanaka

Measurement of Transverse Spin Effects at COMPASS

By measuring transverse single spin asymmetries one has access to the transversity distribution function $\Delta_T q(x)$ and the transverse momentum dependent Sivers function $q_0^T(x,\vec{k}_T)$. New measurements from identified hadrons…

High Energy Physics - Experiment · Physics 2007-05-23 Anselm Vossen

Nuclear dependence of the transverse single-spin asymmetry in the production of charged hadrons at forward rapidity in polarized $p+p$, $p+$Al, and $p+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

We report on the nuclear dependence of transverse single-spin asymmetries (TSSAs) in the production of positively-charged hadrons in polarized $p^{\uparrow}+p$, $p^{\uparrow}+$Al and $p^{\uparrow}+$Au collisions at $\sqrt{s_{_{NN}}}=200$…

High Energy Physics - Experiment · Physics 2019-09-25 C. Aidala , Y. Akiba , M. Alfred , V. Andrieux , N. Apadula , H. Asano , B. Azmoun , V. Babintsev , N. S. Bandara , K. N. Barish , S. Bathe , A. Bazilevsky , M. Beaumier , R. Belmont , A. Berdnikov , Y. Berdnikov , D. S. Blau , J. S. Bok , M. L. Brooks , J. Bryslawskyj , V. Bumazhnov , S. Campbell , V. Canoa Roman , R. Cervantes , C. Y. Chi , M. Chiu , I. J. Choi , J. B. Choi , Z. Citron , M. Connors , N. Cronin , M. Csanád , T. Csörgő , T. W. Danley , M. S. Daugherity , G. David , K. DeBlasio , K. Dehmelt , A. Denisov , A. Deshpande , E. J. Desmond , A. Dion , D. Dixit , J. H. Do , A. Drees , K. A. Drees , J. M. Durham , A. Durum , A. Enokizono , H. En'yo , S. Esumi , B. Fadem , W. Fan , N. Feege , D. E. Fields , M. Finger , M. Finger, , S. L. Fokin , J. E. Frantz , A. Franz , A. D. Frawley , Y. Fukuda , C. Gal , P. Gallus , E. Gamez , E. A. Gamez , P. Garg , H. Ge , F. Giordano , Y. Goto , N. Grau , S. V. Greene , M. Grosse Perdekamp , T. Gunji , H. Guragain , T. Hachiya , J. S. Haggerty , K. I. Hahn , H. Hamagaki , H. F. Hamilton , S. Y. Han , J. Hanks , S. Hasegawa , T. O. S. Haseler , X. He , T. K. Hemmick , J. C. Hill , K. Hill , A. Hodges , R. S. Hollis , K. Homma , B. Hong , T. Hoshino , N. Hotvedt , J. Huang , S. Huang , K. Imai , M. Inaba , A. Iordanova , D. Isenhower , S. Ishimaru , D. Ivanishchev , B. V. Jacak , M. Jezghani , Z. Ji , X. Jiang , B. M. Johnson , D. Jouan , D. S. Jumper , J. H. Kang , D. Kapukchyan , S. Karthas , D. Kawall , A. V. Kazantsev , V. Khachatryan , A. Khanzadeev , C. Kim , E. -J. Kim , M. Kim , D. Kincses , E. Kistenev , J. Klatsky , P. Kline , T. Koblesky , D. Kotov , S. Kudo , B. Kurgyis , K. Kurita , Y. Kwon , J. G. Lajoie , A. Lebedev , S. Lee , S. H. Lee , M. J. Leitch , Y. H. Leung , N. A. Lewis , X. Li , S. H. Lim , M. X. Liu , V. -R. Loggins , S. Lökös , K. Lovasz , D. Lynch , T. Majoros , Y. I. Makdisi , M. Makek , V. I. Manko , E. Mannel , M. McCumber , P. L. McGaughey , D. McGlinchey , C. McKinney , M. Mendoza , W. J. Metzger , A. C. Mignerey , A. Milov , D. K. Mishra , J. T. Mitchell , Iu. Mitrankov , G. Mitsuka , S. Miyasaka , S. Mizuno , P. Montuenga , T. Moon , D. P. Morrison , S. I. Morrow , T. Murakami , J. Murata , K. Nagai , K. Nagashima , T. Nagashima , J. L. Nagle , M. I. Nagy , I. Nakagawa , K. Nakano , C. Nattrass , S. Nelson , T. Niida , R. Nishitani , R. Nouicer , T. Novák , N. Novitzky , A. S. Nyanin , E. O'Brien , C. A. Ogilvie , J. D. Orjuela Koop , J. D. Osborn , A. Oskarsson , G. J. Ottino , K. Ozawa , V. Pantuev , V. Papavassiliou , J. S. Park , S. Park , S. F. Pate , M. Patel , W. Peng , D. V. Perepelitsa , G. D. N. Perera , D. Yu. Peressounko , C. E. PerezLara , J. Perry , R. Petti , M. Phipps , C. Pinkenburg , R. P. Pisani , A. Pun , M. L. Purschke , P. V. Radzevich , K. F. Read , D. Reynolds , V. Riabov , Y. Riabov , D. Richford , T. Rinn , S. D. Rolnick , M. Rosati , Z. Rowan , J. Runchey , A. S. Safonov , T. Sakaguchi , H. Sako , V. Samsonov , M. Sarsour , S. Sato , C. Y. Scarlett , B. Schaefer , B. K. Schmoll , K. Sedgwick , R. Seidl , A. Sen , R. Seto , A. Sexton , D. Sharma , I. Shein , T. -A. Shibata , K. Shigaki , M. Shimomura , T. Shioya , P. Shukla , A. Sickles , C. L. Silva , D. Silvermyr , B. K. Singh , C. P. Singh , V. Singh , M. J. Skoby , M. Slunečka , K. L. Smith , M. Snowball , R. A. Soltz , W. E. Sondheim , S. P. Sorensen , I. V. Sourikova , P. W. Stankus , S. P. Stoll , T. Sugitate , A. Sukhanov , T. Sumita , J. Sun , Z. Sun , S. Suzuki , J. Sziklai , K. Tanida , M. J. Tannenbaum , S. Tarafdar , A. Taranenko , G. Tarnai , R. Tieulent , A. Timilsina , T. Todoroki , M. Tomášek , C. L. Towell , R. S. Towell , I. Tserruya , Y. Ueda , B. Ujvari , H. W. van Hecke , J. Velkovska , M. Virius , V. Vrba , N. Vukman , X. R. Wang , Z. Wang , Y. S. Watanabe , C. P. Wong , C. L. Woody , C. Xu , Q. Xu , L. Xue , S. Yalcin , Y. L. Yamaguchi , H. Yamamoto , A. Yanovich , J. H. Yoo , I. Yoon , H. Yu , I. E. Yushmanov , W. A. Zajc , A. Zelenski , Y. Zhai , S. Zharko , L. Zou

Single Transverse-Spin Asymmetry in Hadronic Dijet Production

We study the single transverse-spin asymmetry for dijet production in hadronic collisions in both the collinear QCD factorization approach and the Brodsky-Hwang-Schmidt model. We show that a nonvanishing asymmetry is generated by both…

High Energy Physics - Phenomenology · Physics 2008-11-26 Jian-Wei Qiu , Werner Vogelsang , Feng Yuan

Measurement of transverse single-spin asymmetries of $\pi^0$ and electromagnetic jets at forward rapidity in 200 and 500 GeV transversely polarized proton-proton collisions

The STAR Collaboration reports measurements of the transverse single-spin asymmetry (TSSA) of inclusive $\pi^0$ at center-of-mass energies ($\sqrt s$) of 200 GeV and 500 GeV in transversely polarized proton-proton collisions in the…

High Energy Physics - Experiment · Physics 2021-06-02 STAR Collaboration , J. Adam , L. Adamczyk , J. R. Adams , J. K. Adkins , G. Agakishiev , M. M. Aggarwal , Z. Ahammed , I. Alekseev , D. M. Anderson , A. Aparin , E. C. Aschenauer , M. U. Ashraf , F. G. Atetalla , A. Attri , G. S. Averichev , V. Bairathi , K. Barish , A. Behera , R. Bellwied , A. Bhasin , J. Bielcik , J. Bielcikova , L. C. Bland , I. G. Bordyuzhin , J. D. Brandenburg , A. V. Brandin , J. Butterworth , H. Caines , M. Calderón de la Barca Sánchez , D. Cebra , I. Chakaberia , P. Chaloupka , B. K. Chan , F-H. Chang , Z. Chang , N. Chankova-Bunzarova , A. Chatterjee , D. Chen , J. Chen , J. H. Chen , X. Chen , Z. Chen , J. Cheng , M. Cherney , M. Chevalier , S. Choudhury , W. Christie , X. Chu , H. J. Crawford , M. Csanád , M. Daugherity , T. G. Dedovich , I. M. Deppner , A. A. Derevschikov , L. Didenko , C. Dilks , X. Dong , J. L. Drachenberg , J. C. Dunlop , T. Edmonds , N. Elsey , J. Engelage , G. Eppley , S. Esumi , O. Evdokimov , A. Ewigleben , O. Eyser , R. Fatemi , S. Fazio , P. Federic , J. Fedorisin , C. J. Feng , Y. Feng , P. Filip , E. Finch , Y. Fisyak , A. Francisco , L. Fulek , C. A. Gagliardi , T. Galatyuk , F. Geurts , N. Ghimire , A. Gibson , K. Gopal , X. Gou , D. Grosnick , W. Guryn , A. I. Hamad , A. Hamed , S. Harabasz , J. W. Harris , S. He , W. He , X. H. He , Y. He , S. Heppelmann , S. Heppelmann , N. Herrmann , E. Hoffman , L. Holub , Y. Hong , S. Horvat , Y. Hu , H. Z. Huang , S. L. Huang , T. Huang , X. Huang , T. J. Humanic , P. Huo , G. Igo , D. Isenhower , W. W. Jacobs , C. Jena , A. Jentsch , Y. Ji , J. Jia , K. Jiang , S. Jowzaee , X. Ju , E. G. Judd , S. Kabana , M. L. Kabir , S. Kagamaster , D. Kalinkin , K. Kang , D. Kapukchyan , K. Kauder , H. W. Ke , D. Keane , A. Kechechyan , M. Kelsey , Y. V. Khyzhniak , D. P. Kikoła , C. Kim , B. Kimelman , D. Kincses , T. A. Kinghorn , I. Kisel , A. Kiselev , M. Kocan , L. Kochenda , L. K. Kosarzewski , L. Kramarik , P. Kravtsov , K. Krueger , N. Kulathunga Mudiyanselage , L. Kumar , S. Kumar , R. Kunnawalkam Elayavalli , J. H. Kwasizur , R. Lacey , S. Lan , J. M. Landgraf , J. Lauret , A. Lebedev , R. Lednicky , J. H. Lee , Y. H. Leung , C. Li , C. Li , W. Li , W. Li , X. Li , Y. Li , Y. Liang , R. Licenik , T. Lin , Y. Lin , M. A. Lisa , F. Liu , H. Liu , P. Liu , P. Liu , T. Liu , X. Liu , Y. Liu , Z. Liu , T. Ljubicic , W. J. Llope , R. S. Longacre , N. S. Lukow , S. Luo , X. Luo , G. L. Ma , L. Ma , R. Ma , Y. G. Ma , N. Magdy , R. Majka , D. Mallick , S. Margetis , C. Markert , H. S. Matis , J. A. Mazer , N. G. Minaev , S. Mioduszewski , B. Mohanty , M. M. Mondal , I. Mooney , Z. Moravcova , D. A. Morozov , M. Nagy , J. D. Nam , Md. Nasim , K. Nayak , D. Neff , J. M. Nelson , D. B. Nemes , M. Nie , G. Nigmatkulov , T. Niida , L. V. Nogach , T. Nonaka , A. S. Nunes , G. Odyniec , A. Ogawa , S. Oh , V. A. Okorokov , B. S. Page , R. Pak , A. Pandav , Y. Panebratsev , B. Pawlik , D. Pawlowska , H. Pei , C. Perkins , L. Pinsky , R. L. Pintér , J. Pluta , B. R. Pokhrel , J. Porter , M. Posik , N. K. Pruthi , M. Przybycien , J. Putschke , H. Qiu , A. Quintero , S. K. Radhakrishnan , S. Ramachandran , R. L. Ray , R. Reed , H. G. Ritter , O. V. Rogachevskiy , J. L. Romero , L. Ruan , J. Rusnak , N. R. Sahoo , H. Sako , S. Salur , J. Sandweiss , S. Sato , W. B. Schmidke , N. Schmitz , B. R. Schweid , F. Seck , J. Seger , M. Sergeeva , R. Seto , P. Seyboth , N. Shah , E. Shahaliev , P. V. Shanmuganathan , M. Shao , A. I. Sheikh , W. Q. Shen , S. S. Shi , Y. Shi , Q. Y. Shou , E. P. Sichtermann , R. Sikora , M. Simko , J. Singh , S. Singha , N. Smirnov , W. Solyst , P. Sorensen , H. M. Spinka , B. Srivastava , T. D. S. Stanislaus , M. Stefaniak , D. J. Stewart , M. Strikhanov , B. Stringfellow , A. A. P. Suaide , M. Sumbera , B. Summa , X. M. Sun , X. Sun , Y. Sun , Y. Sun , B. Surrow , D. N. Svirida , P. Szymanski , A. H. Tang , Z. Tang , A. Taranenko , T. Tarnowsky , J. H. Thomas , A. R. Timmins , D. Tlusty , M. Tokarev , C. A. Tomkiel , S. Trentalange , R. E. Tribble , P. Tribedy , S. K. Tripathy , O. D. Tsai , Z. Tu , T. Ullrich , D. G. Underwood , I. Upsal , G. Van Buren , J. Vanek , A. N. Vasiliev , I. Vassiliev , F. Videbæk , S. Vokal , S. A. Voloshin , F. Wang , G. Wang , J. S. Wang , P. Wang , Y. Wang , Y. Wang , Z. Wang , J. C. Webb , P. C. Weidenkaff , L. Wen , G. D. Westfall , H. Wieman , S. W. Wissink , R. Witt , Y. Wu , Z. G. Xiao , G. Xie , W. Xie , H. Xu , N. Xu , Q. H. Xu , Y. F. Xu , Y. Xu , Z. Xu , Z. Xu , C. Yang , Q. Yang , S. Yang , Y. Yang , Z. Yang , Z. Ye , Z. Ye , L. Yi , K. Yip , Y. Yu , H. Zbroszczyk , W. Zha , C. Zhang , D. Zhang , S. Zhang , S. Zhang , X. P. Zhang , Y. Zhang , Y. Zhang , Z. J. Zhang , Z. Zhang , Z. Zhang , J. Zhao , C. Zhong , C. Zhou , X. Zhu , Z. Zhu , M. Zurek , M. Zyzak

Single transverse-spin asymmetry in high transverse momentum pion production in pp collisions

We study the single-spin (left-right) asymmetry in single-inclusive pion production in hadronic scattering. This asymmetry is power-suppressed in the transverse momentum of the produced pion and can be analyzed in terms of twist-three…

High Energy Physics - Phenomenology · Physics 2008-11-26 Chris Kouvaris , Jian-Wei Qiu , Werner Vogelsang , Feng Yuan

Single Transverse Spin Asymmetries in Semi-inclusive Deep Inelastic Scattering in a Spin-1 Diquark Model

The observed results for the azimuthal single spin asymmetries (SSAs) of the proton, measured in the semi-inclusive deep inelastic scattering (SIDIS), can be explained by the final-state interaction (FSI) from the gluon exchange between the…

High Energy Physics - Phenomenology · Physics 2015-05-20 Narinder Kumar , Harleen Dahiya

Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle $\psi$ about…

High Energy Physics - Experiment · Physics 2013-10-21 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 , R. Fabbri , A. Fantoni , L. Felawka , S. Frullani , D. Gabbert , G. Gapienko , V. Gapienko , G. Gavrilov , V. Gharibyan , F. Giordano , S. Gliske , M. Golembiovskaya , C. Hadjidakis , M. Hartig , D. Hasch , A. Hillenbrand , M. Hoek , Y. Holler , I. Hristova , 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 , P. Lenisa , A. López Ruiz , W. Lorenzon , B. -Q. Ma , D. Mahon , N. C. R. Makins , S. I. Manaenkov , 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 , 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. Schäfer , G. Schnell , 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 , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , S. Wang , S. Yaschenko , Z. Ye , S. Yen , W. Yu , V. Zagrebelnyy , D. Zeiler , B. Zihlmann , P. Zupranski

On Unique Predictions for Single Spin Azimuthal Asymmetry

Theoretically there are two approaches to predict single spin azimuthal asymmetries. One is to take transverse momenta of partons into account by using transverse momentum dependent parton distributions, while another is to take asymmetries…

High Energy Physics - Phenomenology · Physics 2011-09-13 J. P. Ma , Q. Wang

Transverse Spin Physics at HERMES

Single-spin asymmetries in semi-inclusive pion production are measured by the HERMES experiment for the first time, with a transversely polarised hydrogen target. Two different sine-dependencies are extracted which can be related to the…

High Energy Physics - Experiment · Physics 2019-08-14 U. Elschenbroich , G. Schnell , R. Seidl

Transversity and T-odd PDFs from Drell-Yan processes with $pp$, $pD$ and $DD$ collisions

We estimate the single-spin asymmetries (SSA) which provide the access to transversity as well as to Boer-Mulders and Sivers PDFs via investigation of the single-polarized Drell-Yan (DY) processes with $ pp$, $pD$ and $DD$ collisions…

High Energy Physics - Phenomenology · Physics 2009-05-29 A. Sissakian , O. Shevchenko , A. Nagaytsev , O. Ivanov

Parton intrinsic motion: unpolarized cross sections and the Sivers effect in inclusive particle production

We present a detailed study, performed in the framework of LO perturbative QCD with the inclusion of spin and k_T effects, of unpolarized cross sections for the Drell-Yan process and for inclusive pion and photon production in hadronic…

High Energy Physics - Phenomenology · Physics 2017-08-23 U. D'Alesio , F. Murgia

Colour Modification of Factorisation in Single-Spin Asymmetries

We discuss the way in which factorisation is partially maintained but nevertheless modified by process-dependent colour factors in hadronic single-spin asymmetries. We also examine QCD evolution of the twist-three gluonic-pole strength…

High Energy Physics - Phenomenology · Physics 2009-11-24 Philip G. Ratcliffe , Oleg Teryaev

One-loop QCD corrections to SSA in unweighted Drell-Yan processes

We study one-loop QCD corrections to the single transverse spin asymmetry in Drell-Yan process. The invariant mass of virtual photon and angular distributions of final lepton in Collins-Soper frame are measured. Especially, the transverse…

High Energy Physics - Phenomenology · Physics 2026-04-02 Guang-Peng Zhang

Single-spin asymmetries in semi-inclusive pion production

For the first time single-spin asymmetries in semi-inclusive pion production are measured by the HERMES experiment with a transversely polarised hydrogen target. Two different sine-modulations are extracted which can be related to the…

High Energy Physics - Experiment · Physics 2019-08-15 U. Elschenbroich