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Title: Measurements of double-helicity asymmetries in inclusive J / ψ production in longitudinally polarized p + p collisions at s = 510 GeV

We report the double-helicity asymmetry, A J/ψ LL, in inclusive J/ψ production at forward rapidity as a function of transverse momentum p T and rapidity |y|. The data analyzed were taken during √s = 510 GeV longitudinally polarized p + p collisions at the Relativistic Heavy Ion Collider in the 2013 run using the PHENIX detector. At this collision energy, J/ψ particles are predominantly produced through gluon-gluon scatterings, thus A J/ψ LL is sensitive to the gluon polarization inside the proton. We measured A J/ψ LL by detecting the decay daughter muon pairs μ +μ within the PHENIX muon spectrometers in the rapidity range 1.2 < |y| < 2.2. In this kinematic range, we measured the A J/ψ LL to be 0.012 ± 0.010 (stat) ±0.003 (syst). The A J/ψ LL can be expressed to be proportional to the product of the gluon polarization distributions at two distinct ranges of Bjorken x: one at moderate range x ≈ 5 × 10 –2 where recent data of jet and π 0 double helicity spin asymmetries have shown evidence for significant gluon polarization, and the other one covering the poorly known small-x region x ≈ 2 × 10 –3. Furthermore, ourmore » new results could be used to further constrain the gluon polarization for x < 5 × 10 –2.« less
Authors:
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Publication Date:
Report Number(s):
BNL-113758-2017-JA
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1701068
Grant/Contract Number:
SC00112704; NA0003180
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Nuclear Science and Security Consortium; The Regents of the Univ. of California, Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Contributing Orgs:
PHENIX Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1351742
Alternate Identifier(s):
OSTI ID: 1338115; OSTI ID: 1407970

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., Blau, D. S., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Chen, C. -H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., 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., Diss, P. B., Do, J. H., Drees, A., Drees, K. A., Durham, J. M., Durum, A., Enokizono, A., En’yo, H., Esumi, S., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, M., Fokin, S. L., Frantz, J. E., Franz, A., Frawley, A. D., Gal, C., Gallus, P., 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., Hamilton, H. F., Han, S. Y., Hanks, J., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., He, X., Hemmick, T. K., Hill, J. C., Hollis, R. S., Homma, K., Hong, B., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Iordanova, A., Isenhower, D., Ivanishchev, D., Jacak, B. V., Jeon, S. J., Jezghani, M., Jia, J., Jiang, X., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kanda, S., Kang, J. H., Kang, J. S., Kawall, D., Kazantsev, A. V., Key, J. A., Khachatryan, V., Khanzadeev, A., Kihara, K., Kim, C., Kim, D. H., Kim, D. J., Kim, E. -J., Kim, G. W., Kim, H. -J., Kim, M., Kim, Y. K., Kimelman, B., Kistenev, E., Kitamura, R., Klatsky, J., Kleinjan, D., Kline, P., Koblesky, T., Kofarago, M., Komkov, B., Koster, J., Kotov, D., Kurita, K., Kurosawa, M., Kwon, Y., Lacey, R., Lajoie, J. G., Lebedev, A., Lee, K. B., Lee, S., Lee, S. H., Leitch, M. J., Leitgab, M., Li, X., Lim, S. H., Liu, M. X., Lynch, D., 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., Miake, Y., Mignerey, A. C., Miller, A. J., Milov, A., Mishra, D. K., Mitchell, J. T., Miyasaka, S., Mizuno, S., Mohanty, A. K., Montuenga, P., Moon, T., Morrison, D. P., Moukhanova, T. V., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakano, K., Nattrass, C., Netrakanti, P. K., Nihashi, M., Niida, T., Nishimura, S., 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, J. S., Park, S., Pate, S. F., Patel, L., Patel, M., Peng, J. -C., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Purschke, M. L., Rak, J., Ramson, B. J., Ravinovich, I., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Rinn, T., Riveli, N., Roach, D., Rolnick, S. D., Rosati, M., Rowan, Z., Rubin, J. G., Sahlmueller, B., Saito, N., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., 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., Snowball, M., 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., 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, C. L., Towell, M., Towell, R., Towell, R. S., Tserruya, I., van Hecke, H. W., Vargyas, M., Velkovska, J., Virius, M., Vrba, V., Vznuzdaev, E., Wang, X. R., Watanabe, D., Watanabe, Y., Watanabe, Y. S., Wei, F., Whitaker, S., White, A. S., Wolin, S., Woody, C. L., Wysocki, M., Xia, B., 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., Zhou, S., and Zou, L.. Measurements of double-helicity asymmetries in inclusive J/ψ production in longitudinally polarized p+p collisions at s=510 GeV. United States: N. p., Web. doi:10.1103/PhysRevD.94.112008.
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., Blau, D. S., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Chen, C. -H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., 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., Diss, P. B., Do, J. H., Drees, A., Drees, K. A., Durham, J. M., Durum, A., Enokizono, A., En’yo, H., Esumi, S., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, M., Fokin, S. L., Frantz, J. E., Franz, A., Frawley, A. D., Gal, C., Gallus, P., 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., Hamilton, H. F., Han, S. Y., Hanks, J., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., He, X., Hemmick, T. K., Hill, J. C., Hollis, R. S., Homma, K., Hong, B., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Iordanova, A., Isenhower, D., Ivanishchev, D., Jacak, B. V., Jeon, S. J., Jezghani, M., Jia, J., Jiang, X., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kanda, S., Kang, J. H., Kang, J. S., Kawall, D., Kazantsev, A. V., Key, J. A., Khachatryan, V., Khanzadeev, A., Kihara, K., Kim, C., Kim, D. H., Kim, D. J., Kim, E. -J., Kim, G. W., Kim, H. -J., Kim, M., Kim, Y. K., Kimelman, B., Kistenev, E., Kitamura, R., Klatsky, J., Kleinjan, D., Kline, P., Koblesky, T., Kofarago, M., Komkov, B., Koster, J., Kotov, D., Kurita, K., Kurosawa, M., Kwon, Y., Lacey, R., Lajoie, J. G., Lebedev, A., Lee, K. B., Lee, S., Lee, S. H., Leitch, M. J., Leitgab, M., Li, X., Lim, S. H., Liu, M. X., Lynch, D., 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., Miake, Y., Mignerey, A. C., Miller, A. J., Milov, A., Mishra, D. K., Mitchell, J. T., Miyasaka, S., Mizuno, S., Mohanty, A. K., Montuenga, P., Moon, T., Morrison, D. P., Moukhanova, T. V., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakano, K., Nattrass, C., Netrakanti, P. K., Nihashi, M., Niida, T., Nishimura, S., 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, J. S., Park, S., Pate, S. F., Patel, L., Patel, M., Peng, J. -C., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Purschke, M. L., Rak, J., Ramson, B. J., Ravinovich, I., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Rinn, T., Riveli, N., Roach, D., Rolnick, S. D., Rosati, M., Rowan, Z., Rubin, J. G., Sahlmueller, B., Saito, N., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., 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., Snowball, M., 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., 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, C. L., Towell, M., Towell, R., Towell, R. S., Tserruya, I., van Hecke, H. W., Vargyas, M., Velkovska, J., Virius, M., Vrba, V., Vznuzdaev, E., Wang, X. R., Watanabe, D., Watanabe, Y., Watanabe, Y. S., Wei, F., Whitaker, S., White, A. S., Wolin, S., Woody, C. L., Wysocki, M., Xia, B., 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., Zhou, S., & Zou, L.. Measurements of double-helicity asymmetries in inclusive J/ψ production in longitudinally polarized p+p collisions at s=510 GeV. United States. doi:10.1103/PhysRevD.94.112008.
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., Blau, D. S., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Chen, C. -H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., 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., Diss, P. B., Do, J. H., Drees, A., Drees, K. A., Durham, J. M., Durum, A., Enokizono, A., En’yo, H., Esumi, S., Fadem, B., Feege, N., Fields, D. E., Finger, M., Finger, M., Fokin, S. L., Frantz, J. E., Franz, A., Frawley, A. D., Gal, C., Gallus, P., 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., Hamilton, H. F., Han, S. Y., Hanks, J., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., He, X., Hemmick, T. K., Hill, J. C., Hollis, R. S., Homma, K., Hong, B., Hoshino, T., Hotvedt, N., Huang, J., Huang, S., Ikeda, Y., Imai, K., Imazu, Y., Inaba, M., Iordanova, A., Isenhower, D., Ivanishchev, D., Jacak, B. V., Jeon, S. J., Jezghani, M., Jia, J., Jiang, X., Johnson, B. M., Joo, E., Joo, K. S., Jouan, D., Jumper, D. S., Kanda, S., Kang, J. H., Kang, J. S., Kawall, D., Kazantsev, A. V., Key, J. A., Khachatryan, V., Khanzadeev, A., Kihara, K., Kim, C., Kim, D. H., Kim, D. J., Kim, E. -J., Kim, G. W., Kim, H. -J., Kim, M., Kim, Y. K., Kimelman, B., Kistenev, E., Kitamura, R., Klatsky, J., Kleinjan, D., Kline, P., Koblesky, T., Kofarago, M., Komkov, B., Koster, J., Kotov, D., Kurita, K., Kurosawa, M., Kwon, Y., Lacey, R., Lajoie, J. G., Lebedev, A., Lee, K. B., Lee, S., Lee, S. H., Leitch, M. J., Leitgab, M., Li, X., Lim, S. H., Liu, M. X., Lynch, D., 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., Miake, Y., Mignerey, A. C., Miller, A. J., Milov, A., Mishra, D. K., Mitchell, J. T., Miyasaka, S., Mizuno, S., Mohanty, A. K., Montuenga, P., Moon, T., Morrison, D. P., Moukhanova, T. V., Murakami, T., Murata, J., Mwai, A., Nagamiya, S., Nagashima, K., Nagle, J. L., Nagy, M. I., Nakagawa, I., Nakagomi, H., Nakano, K., Nattrass, C., Netrakanti, P. K., Nihashi, M., Niida, T., Nishimura, S., 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, J. S., Park, S., Pate, S. F., Patel, L., Patel, M., Peng, J. -C., Perepelitsa, D. V., Perera, G. D. N., Peressounko, D. Yu., Perry, J., Petti, R., Pinkenburg, C., Pinson, R., Pisani, R. P., Purschke, M. L., Rak, J., Ramson, B. J., Ravinovich, I., Read, K. F., Reynolds, D., Riabov, V., Riabov, Y., Rinn, T., Riveli, N., Roach, D., Rolnick, S. D., Rosati, M., Rowan, Z., Rubin, J. G., Sahlmueller, B., Saito, N., Sakaguchi, T., Sako, H., Samsonov, V., Sarsour, M., Sato, S., Sawada, S., 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., Snowball, M., 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., 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, C. L., Towell, M., Towell, R., Towell, R. S., Tserruya, I., van Hecke, H. W., Vargyas, M., Velkovska, J., Virius, M., Vrba, V., Vznuzdaev, E., Wang, X. R., Watanabe, D., Watanabe, Y., Watanabe, Y. S., Wei, F., Whitaker, S., White, A. S., Wolin, S., Woody, C. L., Wysocki, M., Xia, B., 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., Zhou, S., and Zou, L.. 2016. "Measurements of double-helicity asymmetries in inclusive J/ψ production in longitudinally polarized p+p collisions at s=510 GeV". United States. doi:10.1103/PhysRevD.94.112008. https://www.osti.gov/servlets/purl/1351742.
@article{osti_1351742,
title = {Measurements of double-helicity asymmetries in inclusive J/ψ production in longitudinally polarized p+p collisions at s=510 GeV},
author = {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 Blau, D. S. and Bok, J. S. and Boyle, K. and Brooks, M. L. and Bryslawskyj, J. and Buesching, H. and Bumazhnov, V. and Campbell, S. 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 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 Diss, P. B. 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 Esumi, S. and Fadem, B. and Feege, N. and Fields, D. E. and Finger, M. and Finger, M. and Fokin, S. L. and Frantz, J. E. and Franz, A. and Frawley, A. D. and Gal, C. and Gallus, P. 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 Hamilton, H. F. and Han, S. Y. and Hanks, J. and Hasegawa, S. and Haseler, T. O. S. and Hashimoto, K. and He, X. and Hemmick, T. K. and Hill, J. C. and Hollis, R. S. and Homma, K. and Hong, B. and Hoshino, T. and Hotvedt, N. 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 Ivanishchev, D. and Jacak, B. V. and Jeon, S. J. and Jezghani, M. and Jia, J. and Jiang, X. and Johnson, B. M. and Joo, E. and Joo, K. S. and Jouan, D. and Jumper, D. 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abstractNote = {We report the double-helicity asymmetry, AJ/ψLL, in inclusive J/ψ production at forward rapidity as a function of transverse momentum pT and rapidity |y|. The data analyzed were taken during √s = 510 GeV longitudinally polarized p + p collisions at the Relativistic Heavy Ion Collider in the 2013 run using the PHENIX detector. At this collision energy, J/ψ particles are predominantly produced through gluon-gluon scatterings, thus AJ/ψLL is sensitive to the gluon polarization inside the proton. We measured AJ/ψLL by detecting the decay daughter muon pairs μ+μ– within the PHENIX muon spectrometers in the rapidity range 1.2 < |y| < 2.2. In this kinematic range, we measured the AJ/ψLL to be 0.012 ± 0.010 (stat) ±0.003 (syst). The AJ/ψLL can be expressed to be proportional to the product of the gluon polarization distributions at two distinct ranges of Bjorken x: one at moderate range x ≈ 5 × 10–2 where recent data of jet and π0 double helicity spin asymmetries have shown evidence for significant gluon polarization, and the other one covering the poorly known small-x region x ≈ 2 × 10–3. Furthermore, our new results could be used to further constrain the gluon polarization for x < 5 × 10–2.},
doi = {10.1103/PhysRevD.94.112008},
journal = {Physical Review D},
number = 11,
volume = 94,
place = {United States},
year = {2016},
month = {12}
}