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Phys Rev Lett. 2015 Dec 11;115(24):242501. doi: 10.1103/PhysRevLett.115.242501. Epub 2015 Dec 08.

Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p^{↑}+p at sqrt[s]=200  GeV.

Physical review letters

L Adamczyk, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, J Alford, A Aparin, D Arkhipkin, E C Aschenauer, G S Averichev, A Banerjee, R Bellwied, A Bhasin, A K Bhati, P Bhattarai, J Bielcik, J Bielcikova, L C Bland, I G Bordyuzhin, J Bouchet, A V Brandin, I Bunzarov, T P Burton, J Butterworth, H Caines, M Calderón de la Barca Sánchez, J M Campbell, D Cebra, M C Cervantes, I Chakaberia, P Chaloupka, Z Chang, S Chattopadhyay, J H Chen, X Chen, J Cheng, M Cherney, W Christie, G Contin, H J Crawford, S Das, L C De Silva, R R Debbe, T G Dedovich, J Deng, A A Derevschikov, B di Ruzza, L Didenko, C Dilks, X Dong, J L Drachenberg, J E Draper, C M Du, L E Dunkelberger, J C Dunlop, L G Efimov, J Engelage, G Eppley, R Esha, O Evdokimov, O Eyser, R Fatemi, S Fazio, P Federic, J Fedorisin, Z Feng, P Filip, Y Fisyak, C E Flores, L Fulek, C A Gagliardi, D Garand, F Geurts, A Gibson, M Girard, L Greiner, D Grosnick, D S Gunarathne, Y Guo, S Gupta, A Gupta, W Guryn, A Hamad, A Hamed, R Haque, J W Harris, L He, S Heppelmann, S Heppelmann, A Hirsch, G W Hoffmann, D J Hofman, S Horvat, B Huang, X Huang, H Z Huang, P Huck, T J Humanic, G Igo, W W Jacobs, H Jang, K Jiang, E G Judd, S Kabana, D Kalinkin, K Kang, K Kauder, H W Ke, D Keane, A Kechechyan, Z H Khan, D P Kikola, I Kisel, A Kisiel, L Kochenda, D D Koetke, T Kollegger, L K Kosarzewski, A F Kraishan, P Kravtsov, K Krueger, I Kulakov, L Kumar, R A Kycia, M A C Lamont, J M Landgraf, K D Landry, J Lauret, A Lebedev, R Lednicky, J H Lee, X Li, C Li, W Li, Z M Li, Y Li, X Li, M A Lisa, F Liu, T Ljubicic, W J Llope, M Lomnitz, R S Longacre, X Luo, Y G Ma, G L Ma, L Ma, R Ma, N Magdy, R Majka, A Manion, S Margetis, C Markert, H Masui, H S Matis, D McDonald, K Meehan, N G Minaev, S Mioduszewski, B Mohanty, M M Mondal, D Morozov, M K Mustafa, B K Nandi, Md Nasim, T K Nayak, G Nigmatkulov, L V Nogach, S Y Noh, J Novak, S B Nurushev, G Odyniec, A Ogawa, K Oh, V Okorokov, D Olvitt, B S Page, R Pak, Y X Pan, Y Pandit, Y Panebratsev, B Pawlik, H Pei, C Perkins, A Peterson, P Pile, M Planinic, J Pluta, N Poljak, K Poniatowska, J Porter, M Posik, A M Poskanzer, N K Pruthi, J Putschke, H Qiu, A Quintero, S Ramachandran, R Raniwala, S Raniwala, R L Ray, H G Ritter, J B Roberts, O V Rogachevskiy, J L Romero, A Roy, L Ruan, J Rusnak, O Rusnakova, N R Sahoo, P K Sahu, I Sakrejda, S Salur, J Sandweiss, A Sarkar, J Schambach, R P Scharenberg, A M Schmah, W B Schmidke, N Schmitz, J Seger, P Seyboth, N Shah, E Shahaliev, P V Shanmuganathan, M Shao, M K Sharma, B Sharma, W Q Shen, S S Shi, Q Y Shou, E P Sichtermann, R Sikora, M Simko, M J Skoby, D Smirnov, N Smirnov, L Song, P Sorensen, H M Spinka, B Srivastava, T D S Stanislaus, M Stepanov, R Stock, M Strikhanov, B Stringfellow, M Sumbera, B Summa, X Sun, Z Sun, X M Sun, Y Sun, B Surrow, N Svirida, M A Szelezniak, A H Tang, Z Tang, T Tarnowsky, A N Tawfik, J H Thomas, A R Timmins, D Tlusty, M Tokarev, S Trentalange, R E Tribble, P Tribedy, S K Tripathy, B A Trzeciak, O D Tsai, T Ullrich, D G Underwood, I Upsal, G Van Buren, G van Nieuwenhuizen, M Vandenbroucke, R Varma, A N Vasiliev, R Vertesi, F Videbæk, Y P Viyogi, S Vokal, S A Voloshin, A Vossen, G Wang, Y Wang, F Wang, Y Wang, H Wang, J S Wang, J C Webb, G Webb, L Wen, G D Westfall, H Wieman, S W Wissink, R Witt, Y F Wu, Z G Xiao, W Xie, K Xin, Q H Xu, Z Xu, H Xu, N Xu, Y F Xu, Q Yang, Y Yang, S Yang, Y Yang, C Yang, Z Ye, P Yepes, L Yi, K Yip, I-K Yoo, N Yu, H Zbroszczyk, W Zha, X P Zhang, J Zhang, Y Zhang, J Zhang, J B Zhang, S Zhang, Z Zhang, J Zhao, C Zhong, L Zhou, X Zhu, Y Zoulkarneeva, M Zyzak,

Affiliations

  1. AGH University of Science and Technology, Cracow 30-059, Poland.
  2. University of Kentucky, Lexington, Kentucky, 40506-0055, USA.
  3. Joint Institute for Nuclear Research, Dubna, 141 980, Russia.
  4. Panjab University, Chandigarh 160014, India.
  5. Variable Energy Cyclotron Centre, Kolkata 700064, India.
  6. Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia.
  7. Kent State University, Kent, Ohio 44242, USA.
  8. Brookhaven National Laboratory, Upton, New York 11973, USA.
  9. University of Houston, Houston, Texas 77204, USA.
  10. University of Jammu, Jammu 180001, India.
  11. University of Texas, Austin, Texas 78712, USA.
  12. Czech Technical University in Prague, FNSPE, Prague, 115 19, Czech Republic.
  13. Nuclear Physics Institute AS CR, 250 68 ?ež/Prague, Czech Republic.
  14. Moscow Engineering Physics Institute, Moscow 115409, Russia.
  15. Rice University, Houston, Texas 77251, USA.
  16. Yale University, New Haven, Connecticut 06520, USA.
  17. University of California, Davis, California 95616, USA.
  18. Ohio State University, Columbus, Ohio 43210, USA.
  19. Texas A&M University, College Station, Texas 77843, USA.
  20. Shanghai Institute of Applied Physics, Shanghai 201800, China.
  21. Institute of Modern Physics, Lanzhou 730000, China.
  22. Tsinghua University, Beijing 100084, China.
  23. Creighton University, Omaha, Nebraska 68178, USA.
  24. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  25. University of California, Berkeley, California 94720, USA.
  26. Institute of Physics, Bhubaneswar 751005, India.
  27. Shandong University, Jinan, Shandong 250100, China.
  28. Institute of High Energy Physics, Protvino 142281, Russia.
  29. Pennsylvania State University, University Park, Pennsylvania 16802, USA.
  30. Valparaiso University, Valparaiso, Indiana 46383, USA.
  31. University of California, Los Angeles, California 90095, USA.
  32. University of Illinois at Chicago, Chicago, Illinois 60607, USA.
  33. Central China Normal University (HZNU), Wuhan 430079, China.
  34. Purdue University, West Lafayette, Indiana 47907, USA.
  35. Warsaw University of Technology, Warsaw 00-661, Poland.
  36. Temple University, Philadelphia, Pennsylvania 19122, USA.
  37. University of Science and Technology of China, Hefei 230026, China.
  38. National Institute of Science Education and Research, Bhubaneswar 751005, India.
  39. Indiana University, Bloomington, Indiana 47408, USA.
  40. Korea Institute of Science and Technology Information, Daejeon 305-701, Korea.
  41. Wayne State University, Detroit, Michigan 48201, USA.
  42. Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
  43. Argonne National Laboratory, Argonne, Illinois 60439, USA.
  44. Institute of Nuclear Physics PAN, Cracow 31-342, Poland.
  45. World Laboratory for Cosmology and Particle Physics (WLCAPP), Cairo 11571, Egypt.
  46. Indian Institute of Technology, Mumbai 400076, India.
  47. Michigan State University, East Lansing, Michigan 48824, USA.
  48. Pusan National University, Pusan 609735, Republic of Korea.
  49. University of Zagreb, Zagreb HR-10002, Croatia.
  50. University of Rajasthan, Jaipur 302004, India.
  51. Max-Planck-Institut fur Physik, Munich 80805, Germany.
  52. United States Naval Academy, Annapolis, Maryland 21402, USA.

PMID: 26705627 DOI: 10.1103/PhysRevLett.115.242501

Abstract

We report the observation of transverse polarization-dependent azimuthal correlations in charged pion pair production with the STAR experiment in p^{↑}+p collisions at RHIC. These correlations directly probe quark transversity distributions. We measure signals in excess of 5 standard deviations at high transverse momenta, at high pseudorapidities η>0.5, and for pair masses around the mass of the ρ meson. This is the first direct transversity measurement in p+p collisions.

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