Display options
Cite
Acharya UA, Aidala C, Akiba Y, et al. Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200  GeV. Phys Rev Lett. 2021;127(16):162001doi: 10.1103/PhysRevLett.127.162001.
Acharya, U. A., Aidala, C., Akiba, Y., Alfred, M., Andrieux, V., Apadula, N., Asano, H., Azmoun, B., Babintsev, V., Bandara, N. S., Barish, K. N., Bathe, S., Bazilevsky, A., Beaumier, M., Belmont, R., Berdnikov, A., Berdnikov, Y., Bichon, L., Blankenship, B., Blau, D. S., Bok, J. S., Brooks, M. L., Bryslawskyj, J., Bumazhnov, V., Campbell, S., Canoa Roman, V., Cervantes, R., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Citron, Z., Connors, M., Corliss, R., Corrales Morales, Y., Cronin, N., Csanád, M., Csörgő, T., Danley, T. W., Daugherity, M. S., David, G., DeBlasio, K., Dehmelt, K., Denisov, A., Deshpande, A., Desmond, E. J., Dion, A., Dixit, D., Do, J. H., Drees, A., Drees, K. A., Durham, J. M., Durum, A., Enokizono, A., En'yo, H., Esha, R., Esumi, S., Fadem, B., Fan, W., Feege, N., Fields, D. E., Finger, M., Finger, M., Fitzgerald, D., Fokin, S. L., Frantz, J. E., Franz, A., Frawley, A. D., Fukuda, Y., Gal, C., Gallus, P., Garg, P., Ge, H., Giles, M., Giordano, F., Goto, Y., Grau, N., Greene, S. V., Grosse Perdekamp, M., Gunji, T., Guragain, H., Hachiya, T., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamilton, H. F., Han, S. Y., Hanks, J., Harvey, M., Hasegawa, S., Haseler, T. O. S., He, X., Hemmick, T. K., Hill, J. C., Hill, K., Hodges, A., Hollis, R. S., Homma, K., Hong, B., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Imai, K., Inaba, M., Iordanova, A., Isenhower, D., Ivanishchev, D., Jacak, B. V., Jezghani, M., Ji, Z., Jiang, X., Johnson, B. M., Jouan, D., Jumper, D. S., Kang, J. H., Kapukchyan, D., Karthas, S., Kawall, D., Kazantsev, A. V., Khachatryan, V., Khanzadeev, A., Khatiwada, A., Kim, C., Kim, E. J., Kim, M., Kincses, D., Kingan, A., Kistenev, E., Klatsky, J., Kline, P., Koblesky, T., Kotov, D., Kudo, S., Kurgyis, B., Kurita, K., Kwon, Y., Lajoie, J. G., Larionova, D., Lebedev, A., Lee, S., Lee, S. H., Leitch, M. J., Leung, Y. H., Lewis, N. A., Li, X., Lim, S. H., Liu, M. X., Loggins, V. R., Lökös, S., Loomis, D. A., Lovasz, K., Lynch, D., Majoros, T., Makdisi, Y. I., Makek, M., Manko, V. I., Mannel, E., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Mendoza, M., Mignerey, A. C., Milov, A., Mishra, D. K., Mitchell, J. T., Mitrankov, I., Mitrankova, M., Mitsuka, G., Miyasaka, S., Mizuno, S., Mondal, M. M., Montuenga, P., Moon, T., Morrison, D. P., Mulilo, B., Murakami, T., Murata, J., Nagai, K., Nagashima, K., Nagashima, T., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakano, K., Nattrass, C., Nelson, S., Niida, T., Nouicer, R., Novák, T., Novitzky, N., Nukazuka, G., Nyanin, A. S., O'Brien, E., Ogilvie, C. A., Orjuela Koop, J. D., Osborn, J. D., Oskarsson, A., Ottino, G. J., Ozawa, K., Pantuev, V., Papavassiliou, V., Park, J. S., Park, S., Pate, S. F., Patel, M., Peng, W., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Y., PerezLara, C. E., Perry, J., Petti, R., Phipps, M., Pinkenburg, C., Pisani, R. P., Potekhin, M., Pun, A., Purschke, M. L., Radzevich, P. V., Ramasubramanian, N., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Richford, D., Rinn, T., Rolnick, S. D., Rosati, M., Rowan, Z., Runchey, J., Safonov, A. S., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seidl, R., Sen, A., Seto, R., Sexton, A., Sharma, D., Sharma, D., Shein, I., Shibata, T. A., Shigaki, K., Shimomura, M., Shioya, T., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Singh, B. K., Singh, C. P., Singh, V., Slunečka, M., Smith, K. L., Snowball, M., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Stankus, P. W., Stoll, S. P., Sugitate, T., Sukhanov, A., Sumita, T., Sun, J., Sun, Z., Sziklai, J., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tarnai, G., Tieulent, R., Timilsina, A., Todoroki, T., Tomášek, M., Towell, C. L., Towell, R. S., Tserruya, I., Ueda, Y., Ujvari, B., van Hecke, H. W., Velkovska, J., Virius, M., Vrba, V., Vukman, N., Wang, X. R., Watanabe, Y. S., Wong, C. P., Woody, C. L., Xu, C., Xu, Q., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yamamoto, H., Yanovich, A., Yoo, J. H., Yoon, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zelenski, A., Zharko, S., Zou, L. (2021). Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200  GeV. Physical review letters, 127(16), 162001. https://doi.org/10.1103/PhysRevLett.127.162001
Acharya, U A, et al. "Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200  GeV." Physical review letters vol. 127,16 (2021): 162001. doi: https://doi.org/10.1103/PhysRevLett.127.162001
Acharya UA, Aidala C, Akiba Y, Alfred M, Andrieux V, Apadula N, Asano H, Azmoun B, Babintsev V, Bandara NS, Barish KN, Bathe S, Bazilevsky A, Beaumier M, Belmont R, Berdnikov A, Berdnikov Y, Bichon L, Blankenship B, Blau DS, Bok JS, Brooks ML, Bryslawskyj J, Bumazhnov V, Campbell S, Canoa Roman V, Cervantes R, Chi CY, Chiu M, Choi IJ, Choi JB, Citron Z, Connors M, Corliss R, Corrales Morales Y, Cronin N, Csanád M, Csörgő T, Danley TW, Daugherity MS, David G, DeBlasio K, Dehmelt K, Denisov A, Deshpande A, Desmond EJ, Dion A, Dixit D, Do JH, Drees A, Drees KA, Durham JM, Durum A, Enokizono A, En'yo H, Esha R, Esumi S, Fadem B, Fan W, Feege N, Fields DE, Finger M, Finger M, Fitzgerald D, Fokin SL, Frantz JE, Franz A, Frawley AD, Fukuda Y, Gal C, Gallus P, Garg P, Ge H, Giles M, Giordano F, Goto Y, Grau N, Greene SV, Grosse Perdekamp M, Gunji T, Guragain H, Hachiya T, Haggerty JS, Hahn KI, Hamagaki H, Hamilton HF, Han SY, Hanks J, Harvey M, Hasegawa S, Haseler TOS, He X, Hemmick TK, Hill JC, Hill K, Hodges A, Hollis RS, Homma K, Hong B, Hoshino T, Hotvedt N, Huang J, Huang S, Imai K, Inaba M, Iordanova A, Isenhower D, Ivanishchev D, Jacak BV, Jezghani M, Ji Z, Jiang X, Johnson BM, Jouan D, Jumper DS, Kang JH, Kapukchyan D, Karthas S, Kawall D, Kazantsev AV, Khachatryan V, Khanzadeev A, Khatiwada A, Kim C, Kim EJ, Kim M, Kincses D, Kingan A, Kistenev E, Klatsky J, Kline P, Koblesky T, Kotov D, Kudo S, Kurgyis B, Kurita K, Kwon Y, Lajoie JG, Larionova D, Lebedev A, Lee S, Lee SH, Leitch MJ, Leung YH, Lewis NA, Li X, Lim SH, Liu MX, Loggins VR, Lökös S, Loomis DA, Lovasz K, Lynch D, Majoros T, Makdisi YI, Makek M, Manko VI, Mannel E, McCumber M, McGaughey PL, McGlinchey D, McKinney C, Mendoza M, Mignerey AC, Milov A, Mishra DK, Mitchell JT, Mitrankov I, Mitrankova M, Mitsuka G, Miyasaka S, Mizuno S, Mondal MM, Montuenga P, Moon T, Morrison DP, Mulilo B, Murakami T, Murata J, Nagai K, Nagashima K, Nagashima T, Nagle JL, Nagy MI, Nakagawa I, Nakano K, Nattrass C, Nelson S, Niida T, Nouicer R, Novák T, Novitzky N, Nukazuka G, Nyanin AS, O'Brien E, Ogilvie CA, Orjuela Koop JD, Osborn JD, Oskarsson A, Ottino GJ, Ozawa K, Pantuev V, Papavassiliou V, Park JS, Park S, Pate SF, Patel M, Peng W, Perepelitsa DV, Perera GDN, Peressounko DY, PerezLara CE, Perry J, Petti R, Phipps M, Pinkenburg C, Pisani RP, Potekhin M, Pun A, Purschke ML, Radzevich PV, Ramasubramanian N, Read KF, Reynolds D, Riabov V, Riabov Y, Richford D, Rinn T, Rolnick SD, Rosati M, Rowan Z, Runchey J, Safonov AS, Sakaguchi T, Sako H, Samsonov V, Sarsour M, Sato S, Schaefer B, Schmoll BK, Sedgwick K, Seidl R, Sen A, Seto R, Sexton A, Sharma D, Sharma D, Shein I, Shibata TA, Shigaki K, Shimomura M, Shioya T, Shukla P, Sickles A, Silva CL, Silvermyr D, Singh BK, Singh CP, Singh V, Slunečka M, Smith KL, Snowball M, Soltz RA, Sondheim WE, Sorensen SP, Sourikova IV, Stankus PW, Stoll SP, Sugitate T, Sukhanov A, Sumita T, Sun J, Sun Z, Sziklai J, Tanida K, Tannenbaum MJ, Tarafdar S, Taranenko A, Tarnai G, Tieulent R, Timilsina A, Todoroki T, Tomášek M, Towell CL, Towell RS, Tserruya I, Ueda Y, Ujvari B, van Hecke HW, Velkovska J, Virius M, Vrba V, Vukman N, Wang XR, Watanabe YS, Wong CP, Woody CL, Xu C, Xu Q, Xue L, Yalcin S, Yamaguchi YL, Yamamoto H, Yanovich A, Yoo JH, Yoon I, Yu H, Yushmanov IE, Zajc WA, Zelenski A, Zharko S, Zou L. Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200  GeV. Phys Rev Lett. 2021 Oct 15;127(16):162001. doi: 10.1103/PhysRevLett.127.162001. PMID: 34723614.
Copy Download .nbib Format: NLM
Share it on

Phys Rev Lett. 2021 Oct 15;127(16):162001. doi: 10.1103/PhysRevLett.127.162001.

Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200  GeV.

Physical review letters

U A Acharya, 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, L Bichon, B Blankenship, 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, R Corliss, Y Corrales Morales, 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, R Esha, S Esumi, B Fadem, W Fan, N Feege, D E Fields, M Finger, M Finger, D Fitzgerald, S L Fokin, J E Frantz, A Franz, A D Frawley, Y Fukuda, C Gal, P Gallus, P Garg, H Ge, M Giles, 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, M Harvey, 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, 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, A Khatiwada, C Kim, E-J Kim, M Kim, D Kincses, A Kingan, E Kistenev, J Klatsky, P Kline, T Koblesky, D Kotov, S Kudo, B Kurgyis, K Kurita, Y Kwon, J G Lajoie, D Larionova, 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, D A Loomis, 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, A C Mignerey, A Milov, D K Mishra, J T Mitchell, Iu Mitrankov, M Mitrankova, G Mitsuka, S Miyasaka, S Mizuno, M M Mondal, P Montuenga, T Moon, D P Morrison, B Mulilo, 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 Nouicer, T Novák, N Novitzky, G Nukazuka, 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, M Potekhin, A Pun, M L Purschke, P V Radzevich, N Ramasubramanian, 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, B Schaefer, B K Schmoll, K Sedgwick, R Seidl, A Sen, R Seto, A Sexton, D Sharma, 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 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, 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, 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, S Zharko, L Zou,

Affiliations

  1. Georgia State University, Atlanta, Georgia 30303, USA.
  2. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
  3. RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
  4. RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  5. Department of Physics and Astronomy, Howard University, Washington, D.C. 20059, USA.
  6. Iowa State University, Ames, Iowa 50011, USA.
  7. Kyoto University, Kyoto 606-8502, Japan.
  8. Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  9. IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia.
  10. Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA.
  11. University of California-Riverside, Riverside, California 92521, USA.
  12. Baruch College, City University of New York, New York, New York 10010, USA.
  13. University of Colorado, Boulder, Colorado 80309, USA.
  14. Physics and Astronomy Department, University of North Carolina at Greensboro, Greensboro, North Carolina 27412, USA.
  15. Saint Petersburg State Polytechnic University, St. Petersburg 195251, Russia.
  16. Vanderbilt University, Nashville, Tennessee 37235, USA.
  17. National Research Center "Kurchatov Institute," Moscow, 123098 Russia.
  18. National Research Nuclear University, MEPhI, Moscow Engineering Physics Institute, Moscow 115409, Russia.
  19. New Mexico State University, Las Cruces, New Mexico 88003, USA.
  20. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  21. Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA.
  22. Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
  23. University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
  24. Jeonbuk National University, Jeonju 54896, Korea.
  25. Weizmann Institute, Rehovot 76100, Israel.
  26. ELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, Hungary.
  27. Eszterházy Károly University, Károly Róbert Campus, H-3200 Gyöngyös, Mátrai út 36, Hungary.
  28. Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences (Wigner RCP, RMKI) H-1525 Budapest 114, P.O. Box 49, Budapest, Hungary.
  29. Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
  30. Abilene Christian University, Abilene, Texas 79699, USA.
  31. University of New Mexico, Albuquerque, New Mexico 87131, USA.
  32. Yonsei University, IPAP, Seoul 120-749, Korea.
  33. Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  34. Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan.
  35. Tomonaga Center for the History of the Universe, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.
  36. Muhlenberg College, Allentown, Pennsylvania 18104-5586, USA.
  37. Charles University, Ovocný trh 5, Praha 1, 116 36 Prague, Czech Republic.
  38. Florida State University, Tallahassee, Florida 32306, USA.
  39. Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic.
  40. Department of Physics, Banaras Hindu University, Varanasi 221005, India.
  41. Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA.
  42. Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
  43. Nara Women's University, Kita-uoya Nishi-machi Nara 630-8506, Japan.
  44. Ewha Womans University, Seoul 120-750, Korea.
  45. Korea University, Seoul 02841, Korea.
  46. Texas Southern University, Houston, Texas 77004, USA.
  47. Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
  48. Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
  49. PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region 188300, Russia.
  50. IPN-Orsay, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, BP1, F-91406 Orsay, France.
  51. Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
  52. Pusan National University, Pusan 46241, Korea.
  53. Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary.
  54. Department of Physics, Faculty of Science, University of Zagreb, Bijeni?ka c. 32 HR-10002 Zagreb, Croatia.
  55. University of Maryland, College Park, Maryland 20742, USA.
  56. Bhabha Atomic Research Centre, Bombay 400 085, India.
  57. KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan.
  58. Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan.
  59. University of Tennessee, Knoxville, Tennessee 37996, USA.
  60. Florida A&M University, Tallahassee, Florida 32307, USA.
  61. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  62. Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden.
  63. Institute for Nuclear Research of the Russian Academy of Sciences, prospekt 60-letiya Oktyabrya 7a, Moscow 117312, Russia.
  64. Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA.
  65. Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
  66. IPNL, CNRS/IN2P3, Univ Lyon, Universit Lyon 1, F-69622 Villeurbanne, France.
  67. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic.
  68. Peking University, Beijing 100871, People's Republic of China.

PMID: 34723614 DOI: 10.1103/PhysRevLett.127.162001

Abstract

Studying spin-momentum correlations in hadronic collisions offers a glimpse into a three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons in p^{↑}+p collisions at sqrt[s]=200  GeV is measured with the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Because direct photons in particular are produced from the hard scattering and do not interact via the strong force, this measurement is a clean probe of initial-state spin-momentum correlations inside the proton and is in particular sensitive to gluon interference effects within the proton. This is the first time direct photons have been used as a probe of spin-momentum correlations at RHIC. The uncertainties on the results are a 50-fold improvement with respect to those of the one prior measurement for the same observable, from the Fermilab E704 experiment. These results constrain gluon spin-momentum correlations in transversely polarized protons.

Publication Types