Measurements of double-helicity asymmetries in inclusive production in longitudinally polarized collisions at GeV
Abstract
We report the double-helicity asymmetry, AJ=ψ LL , in inclusive J=ψ production at forward rapidity as a function of transverse momentum pT and rapidity jyj. The data analyzed were taken during ffiffiffis p ¼ 510 GeV longitudinally polarized p þ 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=ψ LL is sensitive to the gluon polarization inside the proton. We measured AJ=ψ LL by detecting the decay daughter muon pairs μþμ- within the PHENIX muon spectrometers in the rapidity range 1.2 < jyj < 2.2. In this kinematic range, we measured the AJ=ψ LL to be 0.012 0.010 (stat) 0.003 (syst). The AJ=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 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. Thus our new results could be used to further constrain the gluonmore »
- Authors:
- more »
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Nuclear Science and Security Consortium; Univ. of California, Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- Contributing Org.:
- PHENIX Collaboration
- OSTI Identifier:
- 1351742
- Alternate Identifier(s):
- OSTI ID: 1338115; OSTI ID: 1407970
- Report Number(s):
- BNL-113758-2017-JA
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1701068
- Grant/Contract Number:
- SC00112704; NA0003180
- Resource 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
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., 2016.
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. https://doi.org/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. Thu .
"Measurements of double-helicity asymmetries in inclusive J/ψ production in longitudinally polarized p+p collisions at s=510 GeV". United States. https://doi.org/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=ψ LL , in inclusive J=ψ production at forward rapidity as a function of transverse momentum pT and rapidity jyj. The data analyzed were taken during ffiffiffis p ¼ 510 GeV longitudinally polarized p þ 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=ψ LL is sensitive to the gluon polarization inside the proton. We measured AJ=ψ LL by detecting the decay daughter muon pairs μþμ- within the PHENIX muon spectrometers in the rapidity range 1.2 < jyj < 2.2. In this kinematic range, we measured the AJ=ψ LL to be 0.012 0.010 (stat) 0.003 (syst). The AJ=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 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. Thus 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 = {Thu Dec 29 00:00:00 EST 2016},
month = {Thu Dec 29 00:00:00 EST 2016}
}
Web of Science
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