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Title: Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p + p collisions at s = 510 GeV

Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, A L L , for charged pions at midrapidity ( | η | < 0.35 ) in longitudinally polarized p + p collisions at s = 510 GeV . These measurements are sensitive to the gluon spin contribution to the total spin of the proton in the parton momentum fraction x range between 0.04 and 0.09. One can infer the sign of the gluon polarization from the ordering of pion asymmetries with charge alone. The asymmetries are found to be consistent with global quantum-chromodynamics fits of deep-inelastic scattering and data at s = 200 GeV , which show a nonzero positive contribution of gluon spin to the proton spin.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
PHENIX Collaboration
OSTI Identifier:
1646689
Alternate Identifier(s):
OSTI ID: 1656453
Report Number(s):
BNL-216293-2020-JAAM
Journal ID: ISSN 2470-0010; PRVDAQ; 032001
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 102 Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear reactions; pions; relativistic heavy-ion collisions; hadron-hadron; beam polarization; polarization phenomena; spin

Citation Formats

Acharya, U., Adare, A., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Alfred, M., Apadula, N., Aramaki, Y., Asano, H., Atomssa, E. T., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Bandara, N. S., Bannier, B., Barish, K. N., Bathe, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belmont, R., Berdnikov, A., Berdnikov, Y., Black, D., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Canoa Roman, V., Chen, C. -H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., Connors, M., Csanád, M., Csörgő, T., Danley, T. W., Datta, A., Daugherity, M. S., David, G., DeBlasio, K., Dehmelt, K., Denisov, A., Deshpande, A., Desmond, E. J., Ding, L., Dion, A., 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., Gal, C., Gallus, P., Gamez, E. A., Garg, P., Ge, H., Giordano, F., Glenn, A., Goto, Y., Grau, N., Greene, S. V., Grosse Perdekamp, M., Gu, Y., Gunji, T., Guragain, H., Hachiya, T., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Han, S. Y., Hanks, J., 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., Huang, J., Huang, S., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Iordanova, A., Isenhower, D., Ishimaru, S., Ivanishchev, D., Jacak, B. V., Jeon, S. J., Jezghani, M., Ji, Z., Jia, J., Jiang, X., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kang, J. H., Kang, J. S., Kawall, D., Kazantsev, A. V., Key, J. A., Khachatryan, V., Khanzadeev, A., Khatiwada, A., Kihara, K., Kim, C., Kim, D. H., Kim, D. J., Kim, E. -J., Kim, H. -J., Kim, M., Kim, Y. K., Kincses, D., Kistenev, E., Klatsky, J., Kleinjan, D., Kline, P., Koblesky, T., Kofarago, M., Koster, J., Kotov, D., Kurgyis, B., Kurita, K., Kurosawa, M., Kwon, Y., Lacey, R., Lajoie, J. G., Lebedev, A., Lee, K. B., Lee, S. H., Leitch, M. J., Leitgab, M., Leung, Y. H., Lewis, N. A., Li, X., Lim, S. H., Liu, M. X., Lökös, S., Lynch, D., Majoros, T., Makdisi, Y. I., Makek, M., Manion, A., Manko, V. I., Mannel, E., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Meles, A., Mendoza, M., Meredith, B., Metzger, W. J., Miake, Y., Mignerey, A. C., Miller, A. J., Milov, A., Mishra, D. K., Mitchell, J. T., Mitrankov, Iu., Mitsuka, G., Miyasaka, S., Mizuno, S., Montuenga, P., Moon, T., Morrison, D. P., Morrow, S. I., Moukhanova, T. V., Mulilo, B., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakano, K., Nattrass, C., Nelson, S., Netrakanti, P. K., Nihashi, M., Niida, T., Nishitani, R., Nouicer, R., Novák, T., Novitzky, N., Nyanin, A. S., O’Brien, E., Ogilvie, C. A., Orjuela Koop, J. D., Osborn, J. D., Oskarsson, A., Ozawa, K., Pak, R., Pantuev, V., Papavassiliou, V., Park, S., Pate, S. F., Patel, L., Patel, M., Peng, J. -C., Peng, W., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Yu., PerezLara, C. E., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Potekhin, M., Pun, A., Purschke, M. L., Radzevich, P. V., Rak, J., Ramasubramanian, N., Ravinovich, I., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Richford, D., Rinn, T., Riveli, N., Roach, D., Rolnick, S. D., Rosati, M., Rowan, Z., Rubin, J. G., Runchey, J., Saito, N., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., Scarlett, C. Y., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shibata, T. -A., Shigaki, K., Shimomura, M., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Singh, B. K., Singh, C. P., Singh, V., Slunečka, M., Smith, K. L., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Stankus, P. W., Stepanov, M., Stoll, S. P., Sugitate, T., Sukhanov, A., Sumita, T., Sun, J., Sun, X., Sun, Z., Suzuki, S., Sziklai, J., Takahara, A., Taketani, A., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tieulent, R., Timilsina, A., Todoroki, T., Tomášek, M., Torii, H., Towell, M., Towell, R., Towell, R. S., Tserruya, I., Ueda, Y., Ujvari, B., van Hecke, H. W., Vargyas, M., Velkovska, J., Virius, M., Vrba, V., Vznuzdaev, E., Wang, X. R., Wang, Z., Watanabe, D., Watanabe, Y., Watanabe, Y. S., Wei, F., Whitaker, S., Wolin, S., Wong, C. P., Woody, C. L., Wu, Y., Wysocki, M., Xia, B., Xu, Q., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yanovich, A., Yoo, J. H., Yoon, I., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zelenski, A., Zhai, Y., Zharko, S., Zou, L., and PHENIX Collaboration. Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p + p collisions at s = 510     GeV. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevD.102.032001.
Acharya, U., Adare, A., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Alfred, M., Apadula, N., Aramaki, Y., Asano, H., Atomssa, E. T., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Bandara, N. S., Bannier, B., Barish, K. N., Bathe, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belmont, R., Berdnikov, A., Berdnikov, Y., Black, D., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Canoa Roman, V., Chen, C. -H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., Connors, M., Csanád, M., Csörgő, T., Danley, T. W., Datta, A., Daugherity, M. S., David, G., DeBlasio, K., Dehmelt, K., Denisov, A., Deshpande, A., Desmond, E. J., Ding, L., Dion, A., 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., Gal, C., Gallus, P., Gamez, E. A., Garg, P., Ge, H., Giordano, F., Glenn, A., Goto, Y., Grau, N., Greene, S. V., Grosse Perdekamp, M., Gu, Y., Gunji, T., Guragain, H., Hachiya, T., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Han, S. Y., Hanks, J., 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., Huang, J., Huang, S., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Iordanova, A., Isenhower, D., Ishimaru, S., Ivanishchev, D., Jacak, B. V., Jeon, S. J., Jezghani, M., Ji, Z., Jia, J., Jiang, X., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kang, J. H., Kang, J. S., Kawall, D., Kazantsev, A. V., Key, J. A., Khachatryan, V., Khanzadeev, A., Khatiwada, A., Kihara, K., Kim, C., Kim, D. H., Kim, D. J., Kim, E. -J., Kim, H. -J., Kim, M., Kim, Y. K., Kincses, D., Kistenev, E., Klatsky, J., Kleinjan, D., Kline, P., Koblesky, T., Kofarago, M., Koster, J., Kotov, D., Kurgyis, B., Kurita, K., Kurosawa, M., Kwon, Y., Lacey, R., Lajoie, J. G., Lebedev, A., Lee, K. B., Lee, S. H., Leitch, M. J., Leitgab, M., Leung, Y. H., Lewis, N. A., Li, X., Lim, S. H., Liu, M. X., Lökös, S., Lynch, D., Majoros, T., Makdisi, Y. I., Makek, M., Manion, A., Manko, V. I., Mannel, E., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Meles, A., Mendoza, M., Meredith, B., Metzger, W. J., Miake, Y., Mignerey, A. C., Miller, A. J., Milov, A., Mishra, D. K., Mitchell, J. T., Mitrankov, Iu., Mitsuka, G., Miyasaka, S., Mizuno, S., Montuenga, P., Moon, T., Morrison, D. P., Morrow, S. I., Moukhanova, T. V., Mulilo, B., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakano, K., Nattrass, C., Nelson, S., Netrakanti, P. K., Nihashi, M., Niida, T., Nishitani, R., Nouicer, R., Novák, T., Novitzky, N., Nyanin, A. S., O’Brien, E., Ogilvie, C. A., Orjuela Koop, J. D., Osborn, J. D., Oskarsson, A., Ozawa, K., Pak, R., Pantuev, V., Papavassiliou, V., Park, S., Pate, S. F., Patel, L., Patel, M., Peng, J. -C., Peng, W., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Yu., PerezLara, C. E., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Potekhin, M., Pun, A., Purschke, M. L., Radzevich, P. V., Rak, J., Ramasubramanian, N., Ravinovich, I., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Richford, D., Rinn, T., Riveli, N., Roach, D., Rolnick, S. D., Rosati, M., Rowan, Z., Rubin, J. G., Runchey, J., Saito, N., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., Scarlett, C. Y., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shibata, T. -A., Shigaki, K., Shimomura, M., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Singh, B. K., Singh, C. P., Singh, V., Slunečka, M., Smith, K. L., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Stankus, P. W., Stepanov, M., Stoll, S. P., Sugitate, T., Sukhanov, A., Sumita, T., Sun, J., Sun, X., Sun, Z., Suzuki, S., Sziklai, J., Takahara, A., Taketani, A., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tieulent, R., Timilsina, A., Todoroki, T., Tomášek, M., Torii, H., Towell, M., Towell, R., Towell, R. S., Tserruya, I., Ueda, Y., Ujvari, B., van Hecke, H. W., Vargyas, M., Velkovska, J., Virius, M., Vrba, V., Vznuzdaev, E., Wang, X. R., Wang, Z., Watanabe, D., Watanabe, Y., Watanabe, Y. S., Wei, F., Whitaker, S., Wolin, S., Wong, C. P., Woody, C. L., Wu, Y., Wysocki, M., Xia, B., Xu, Q., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yanovich, A., Yoo, J. H., Yoon, I., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zelenski, A., Zhai, Y., Zharko, S., Zou, L., & PHENIX Collaboration. Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p + p collisions at s = 510     GeV. United States. https://doi.org/10.1103/PhysRevD.102.032001
Acharya, U., Adare, A., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Alfred, M., Apadula, N., Aramaki, Y., Asano, H., Atomssa, E. T., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Bandara, N. S., Bannier, B., Barish, K. N., Bathe, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belmont, R., Berdnikov, A., Berdnikov, Y., Black, D., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Canoa Roman, V., Chen, C. -H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., Connors, M., Csanád, M., Csörgő, T., Danley, T. W., Datta, A., Daugherity, M. S., David, G., DeBlasio, K., Dehmelt, K., Denisov, A., Deshpande, A., Desmond, E. J., Ding, L., Dion, A., 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., Gal, C., Gallus, P., Gamez, E. A., Garg, P., Ge, H., Giordano, F., Glenn, A., Goto, Y., Grau, N., Greene, S. V., Grosse Perdekamp, M., Gu, Y., Gunji, T., Guragain, H., Hachiya, T., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Han, S. Y., Hanks, J., 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., Huang, J., Huang, S., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Iordanova, A., Isenhower, D., Ishimaru, S., Ivanishchev, D., Jacak, B. V., Jeon, S. J., Jezghani, M., Ji, Z., Jia, J., Jiang, X., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kang, J. H., Kang, J. S., Kawall, D., Kazantsev, A. V., Key, J. A., Khachatryan, V., Khanzadeev, A., Khatiwada, A., Kihara, K., Kim, C., Kim, D. H., Kim, D. J., Kim, E. -J., Kim, H. -J., Kim, M., Kim, Y. K., Kincses, D., Kistenev, E., Klatsky, J., Kleinjan, D., Kline, P., Koblesky, T., Kofarago, M., Koster, J., Kotov, D., Kurgyis, B., Kurita, K., Kurosawa, M., Kwon, Y., Lacey, R., Lajoie, J. G., Lebedev, A., Lee, K. B., Lee, S. H., Leitch, M. J., Leitgab, M., Leung, Y. H., Lewis, N. A., Li, X., Lim, S. H., Liu, M. X., Lökös, S., Lynch, D., Majoros, T., Makdisi, Y. I., Makek, M., Manion, A., Manko, V. I., Mannel, E., McCumber, M., McGaughey, P. L., McGlinchey, D., McKinney, C., Meles, A., Mendoza, M., Meredith, B., Metzger, W. J., Miake, Y., Mignerey, A. C., Miller, A. J., Milov, A., Mishra, D. K., Mitchell, J. T., Mitrankov, Iu., Mitsuka, G., Miyasaka, S., Mizuno, S., Montuenga, P., Moon, T., Morrison, D. P., Morrow, S. I., Moukhanova, T. V., Mulilo, B., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakano, K., Nattrass, C., Nelson, S., Netrakanti, P. K., Nihashi, M., Niida, T., Nishitani, R., Nouicer, R., Novák, T., Novitzky, N., Nyanin, A. S., O’Brien, E., Ogilvie, C. A., Orjuela Koop, J. D., Osborn, J. D., Oskarsson, A., Ozawa, K., Pak, R., Pantuev, V., Papavassiliou, V., Park, S., Pate, S. F., Patel, L., Patel, M., Peng, J. -C., Peng, W., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Yu., PerezLara, C. E., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Potekhin, M., Pun, A., Purschke, M. L., Radzevich, P. V., Rak, J., Ramasubramanian, N., Ravinovich, I., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Richford, D., Rinn, T., Riveli, N., Roach, D., Rolnick, S. D., Rosati, M., Rowan, Z., Rubin, J. G., Runchey, J., Saito, N., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., Scarlett, C. Y., Schaefer, B., Schmoll, B. K., Sedgwick, K., Seele, J., Seidl, R., Sen, A., Seto, R., Sett, P., Sexton, A., Sharma, D., Shein, I., Shibata, T. -A., Shigaki, K., Shimomura, M., Shukla, P., Sickles, A., Silva, C. L., Silvermyr, D., Singh, B. K., Singh, C. P., Singh, V., Slunečka, M., Smith, K. L., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Stankus, P. W., Stepanov, M., Stoll, S. P., Sugitate, T., Sukhanov, A., Sumita, T., Sun, J., Sun, X., Sun, Z., Suzuki, S., Sziklai, J., Takahara, A., Taketani, A., Tanida, K., Tannenbaum, M. J., Tarafdar, S., Taranenko, A., Tieulent, R., Timilsina, A., Todoroki, T., Tomášek, M., Torii, H., Towell, M., Towell, R., Towell, R. S., Tserruya, I., Ueda, Y., Ujvari, B., van Hecke, H. W., Vargyas, M., Velkovska, J., Virius, M., Vrba, V., Vznuzdaev, E., Wang, X. R., Wang, Z., Watanabe, D., Watanabe, Y., Watanabe, Y. S., Wei, F., Whitaker, S., Wolin, S., Wong, C. P., Woody, C. L., Wu, Y., Wysocki, M., Xia, B., Xu, Q., Xue, L., Yalcin, S., Yamaguchi, Y. L., Yanovich, A., Yoo, J. H., Yoon, I., Younus, I., Yu, H., Yushmanov, I. E., Zajc, W. A., Zelenski, A., Zhai, Y., Zharko, S., Zou, L., and PHENIX Collaboration. Wed . "Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p + p collisions at s = 510     GeV". United States. https://doi.org/10.1103/PhysRevD.102.032001.
@article{osti_1646689,
title = {Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p + p collisions at s = 510     GeV},
author = {Acharya, U. and Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Alfred, M. and Apadula, N. and Aramaki, Y. and Asano, H. and Atomssa, E. T. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bandara, N. S. and Bannier, B. and Barish, K. N. and Bathe, S. and Bazilevsky, A. and Beaumier, M. and Beckman, S. and Belmont, R. and Berdnikov, A. and Berdnikov, Y. and Black, D. and Bok, J. S. and Boyle, K. and Brooks, M. L. and Bryslawskyj, J. and Buesching, H. and Bumazhnov, V. and Campbell, S. and Canoa Roman, V. and Chen, C. -H. and Chi, C. Y. and Chiu, M. and Choi, I. J. and Choi, J. B. and Chujo, T. and Citron, Z. and Connors, M. and Csanád, M. and Csörgő, T. and Danley, T. W. and Datta, A. and Daugherity, M. S. and David, G. and DeBlasio, K. and Dehmelt, K. and Denisov, A. and Deshpande, A. and Desmond, E. J. and Ding, L. and Dion, A. and Do, J. H. and Drees, A. and Drees, K. A. and Durham, J. M. and Durum, A. and Enokizono, A. and En’yo, H. and Esha, R. and Esumi, S. and Fadem, B. and Fan, W. and Feege, N. and Fields, D. E. and Finger, M. and Finger, M. and Fitzgerald, D. and Fokin, S. L. and Frantz, J. E. and Franz, A. and Frawley, A. D. and Gal, C. and Gallus, P. and Gamez, E. A. and Garg, P. and Ge, H. and Giordano, F. and Glenn, A. and Goto, Y. and Grau, N. and Greene, S. V. and Grosse Perdekamp, M. and Gu, Y. and Gunji, T. and Guragain, H. and Hachiya, T. and Haggerty, J. S. and Hahn, K. I. and Hamagaki, H. and Han, S. Y. and Hanks, J. and Hasegawa, S. and Haseler, T. O. S. and He, X. and Hemmick, T. K. and Hill, J. C. and Hill, K. and Hodges, A. and Hollis, R. S. and Homma, K. and Hong, B. and Hoshino, T. and Huang, J. and Huang, S. and Ikeda, Y. and Imai, K. and Imazu, Y. and Inaba, M. and Iordanova, A. and Isenhower, D. and Ishimaru, S. and Ivanishchev, D. and Jacak, B. V. and Jeon, S. J. and Jezghani, M. and Ji, Z. and Jia, J. and Jiang, X. and Johnson, B. M. and Joo, E. and Joo, K. S. and Jouan, D. and Jumper, D. S. and Kang, J. H. and Kang, J. S. and Kawall, D. and Kazantsev, A. V. and Key, J. A. and Khachatryan, V. and Khanzadeev, A. and Khatiwada, A. and Kihara, K. and Kim, C. and Kim, D. H. and Kim, D. J. and Kim, E. -J. and Kim, H. -J. and Kim, M. and Kim, Y. K. and Kincses, D. and Kistenev, E. and Klatsky, J. and Kleinjan, D. and Kline, P. and Koblesky, T. and Kofarago, M. and Koster, J. and Kotov, D. and Kurgyis, B. and Kurita, K. and Kurosawa, M. and Kwon, Y. and Lacey, R. and Lajoie, J. G. and Lebedev, A. and Lee, K. B. and Lee, S. H. and Leitch, M. J. and Leitgab, M. and Leung, Y. H. and Lewis, N. A. and Li, X. and Lim, S. H. and Liu, M. X. and Lökös, S. and Lynch, D. and Majoros, T. and Makdisi, Y. I. and Makek, M. and Manion, A. and Manko, V. I. and Mannel, E. and McCumber, M. and McGaughey, P. L. and McGlinchey, D. and McKinney, C. and Meles, A. and Mendoza, M. and Meredith, B. and Metzger, W. J. and Miake, Y. and Mignerey, A. C. and Miller, A. J. and Milov, A. and Mishra, D. K. and Mitchell, J. T. and Mitrankov, Iu. and Mitsuka, G. and Miyasaka, S. and Mizuno, S. and Montuenga, P. and Moon, T. and Morrison, D. P. and Morrow, S. I. and Moukhanova, T. V. and Mulilo, B. and Murakami, T. and Murata, J. and Mwai, A. and Nagamiya, S. and Nagashima, K. and Nagle, J. L. and Nagy, M. I. and Nakagawa, I. and Nakagomi, H. and Nakano, K. and Nattrass, C. and Nelson, S. and Netrakanti, P. K. and Nihashi, M. and Niida, T. and Nishitani, R. and Nouicer, R. and Novák, T. and Novitzky, N. and Nyanin, A. S. and O’Brien, E. and Ogilvie, C. A. and Orjuela Koop, J. D. and Osborn, J. D. and Oskarsson, A. and Ozawa, K. and Pak, R. and Pantuev, V. and Papavassiliou, V. and Park, S. and Pate, S. F. and Patel, L. and Patel, M. and Peng, J. -C. and Peng, W. and Perepelitsa, D. V. and Perera, G. D. N. and Peressounko, D. Yu. and PerezLara, C. E. and Perry, J. and Petti, R. and Pinkenburg, C. and Pinson, R. and Pisani, R. P. and Potekhin, M. and Pun, A. and Purschke, M. L. and Radzevich, P. V. and Rak, J. and Ramasubramanian, N. and Ravinovich, I. and Read, K. F. and Reynolds, D. and Riabov, V. and Riabov, Y. and Richford, D. and Rinn, T. and Riveli, N. and Roach, D. and Rolnick, S. D. and Rosati, M. and Rowan, Z. and Rubin, J. G. and Runchey, J. and Saito, N. and Sakaguchi, T. and Sako, H. and Samsonov, V. and Sarsour, M. and Sato, S. and Sawada, S. and Scarlett, C. Y. and Schaefer, B. and Schmoll, B. K. and Sedgwick, K. and Seele, J. and Seidl, R. and Sen, A. and Seto, R. and Sett, P. and Sexton, A. and Sharma, D. and Shein, I. and Shibata, T. -A. and Shigaki, K. and Shimomura, M. and Shukla, P. and Sickles, A. and Silva, C. L. and Silvermyr, D. and Singh, B. K. and Singh, C. P. and Singh, V. and Slunečka, M. and Smith, K. L. and Soltz, R. A. and Sondheim, W. E. and Sorensen, S. P. and Sourikova, I. V. and Stankus, P. W. and Stepanov, M. and Stoll, S. P. and Sugitate, T. and Sukhanov, A. and Sumita, T. and Sun, J. and Sun, X. and Sun, Z. and Suzuki, S. and Sziklai, J. and Takahara, A. and Taketani, A. and Tanida, K. and Tannenbaum, M. J. and Tarafdar, S. and Taranenko, A. and Tieulent, R. and Timilsina, A. and Todoroki, T. and Tomášek, M. and Torii, H. and Towell, M. and Towell, R. and Towell, R. S. and Tserruya, I. and Ueda, Y. and Ujvari, B. and van Hecke, H. W. and Vargyas, M. and Velkovska, J. and Virius, M. and Vrba, V. and Vznuzdaev, E. and Wang, X. R. and Wang, Z. and Watanabe, D. and Watanabe, Y. and Watanabe, Y. S. and Wei, F. and Whitaker, S. and Wolin, S. and Wong, C. P. and Woody, C. L. and Wu, Y. and Wysocki, M. and Xia, B. and Xu, Q. and Xue, L. and Yalcin, S. and Yamaguchi, Y. L. and Yanovich, A. and Yoo, J. H. and Yoon, I. and Younus, I. and Yu, H. and Yushmanov, I. E. and Zajc, W. A. and Zelenski, A. and Zhai, Y. and Zharko, S. and Zou, L. and PHENIX Collaboration},
abstractNote = {The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, ALL, for charged pions at midrapidity (|η|<0.35) in longitudinally polarized p+p collisions at s=510 GeV. These measurements are sensitive to the gluon spin contribution to the total spin of the proton in the parton momentum fraction x range between 0.04 and 0.09. One can infer the sign of the gluon polarization from the ordering of pion asymmetries with charge alone. The asymmetries are found to be consistent with global quantum-chromodynamics fits of deep-inelastic scattering and data at s=200 GeV, which show a nonzero positive contribution of gluon spin to the proton spin.},
doi = {10.1103/PhysRevD.102.032001},
journal = {Physical Review D},
number = 3,
volume = 102,
place = {United States},
year = {2020},
month = {8}
}

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https://doi.org/10.1103/PhysRevD.102.032001

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