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Adam, J, Adamczyk, L, Adams, JR, Adkins, JK, Agakishiev, G, Aggarwal, MM, Ahammed, Z, Alekseev, I, Anderson, DM, Aoyama, R et al (show 346 more authors) , Aparin, A, Arkhipkin, D, Aschenauer, EC, Ashraf, MU, Atetalla, F, Attri, A, Averichev, GS, Bai, X, Bairathi, V, Barish, K, Bassill, AJ, Behera, A, Bellwied, R, Bhasin, A, Bhati, AK, Bielcik, J, Bielcikova, J, Bland, LC, Bordyuzhin, IG, Brandenburg, JD, Brandin, AV, Brown, D, Bryslawskyj, J, Bunzarov, I, Butterworth, J, Caines, H, Sánchez, M Calderón de la Barca, Cebra, D, Cendejas, R, Chakaberia, I, Chaloupka, P, Chan, BK, Chang, F-H, Chang, Z, Chankova-Bunzarova, N, Chatterjee, A, Chattopadhyay, S, Chen, JH, Chen, X, Chen, X, Cheng, J, Cherney, M, Christie, W, Contin, G, Crawford, HJ, Csanad, M, Das, S, Dedovich, TG, Deng, J, Deppner, IM, Derevschikov, AA, Didenko, L, Dilks, C, Dong, X, Drachenberg, JL, Dunlop, JC, Efimov, LG, Elsey, N, Engelage, J, Eppley, G, Esha, R, Esumi, S, Evdokimov, O, Ewigleben, J, Eyser, O, Fatemi, R, Fazio, S, Federic, P, Federicova, P, Fedorisin, J, Filip, P, Finch, E, Fisyak, Y, Flores, CE, Fulek, L, Gagliardi, CA, Galatyuk, T, Geurts, F, Gibson, A, Grosnick, D, Gunarathne, DS, Guo, Y, Gupta, A, Guryn, W, Hamad, AI, Hamed, A, Harlenderova, A, Harris, JW, He, L, Heppelmann, S, Heppelmann, S, Herrmann, N, Hirsch, A, Holub, L, Hong, Y, Horvat, S, Huang, B, Huang, HZ, Huang, SL, Huang, T, Huang, X, Humanic, TJ, Huo, P, Igo, G, Jacobs, WW, Jentsch, A, Jia, J, Jiang, K, Jowzaee, S, Ju, X, Judd, EG, Kabana, S, Kagamaster, S, Kalinkin, D, Kang, K, Kapukchyan, D, Kauder, K, Ke, HW, Keane, D, Kechechyan, A, Kikoła, DP, Kim, C, Kinghorn, TA, Kisel, I, Kisiel, A, Kochenda, L, Kosarzewski, LK, Kraishan, AF, Kramarik, L, Krauth, L, Kravtsov, P, Krueger, K, Kulathunga, N, Kumar, L, Elayavalli, R Kunnawalkam, Kvapil, J, Kwasizur, JH, Lacey, R, Landgraf, JM, Lauret, J, Lebedev, A, Lednicky, R, Lee, JH, Li, C, Li, W, Li, X, Li, Y, Liang, Y, Lidrych, J, Lin, T, Lipiec, A, Lisa, MA, Liu, F, Liu, H, Liu, P, Liu, P, Liu, Y, Liu, Z, Ljubicic, T, Llope, WJ, Lomnitz, M, Longacre, RS, Luo, S, Luo, X, Ma, GL, Ma, L, Ma, R, Ma, YG, Magdy, N, Majka, R, Mallick, D, Margetis, S, Markert, C, Matis, HS, Matonoha, O, Mazer, JA, Meehan, K, Mei, JC, Minaev, NG, Mioduszewski, S, Mishra, D, Mohanty, B, Mondal, MM, Mooney, I, Morozov, DA, Nasim, Md, Negrete, JD, Nelson, JM, Nemes, DB, Nie, M, Nigmatkulov, G, Niida, T, Nogach, LV, Nonaka, T, Odyniec, G, Ogawa, A, Oh, K, Oh, S, Okorokov, VA, Jr, D Olvitt, Page, BS, Pak, R, Panebratsev, Y, Pawlik, B, Pei, H, Perkins, C, Pinter, RL, Pluta, J, Porter, J, Posik, M, Pruthi, NK, Przybycien, M, Putschke, J, Quintero, A, Radhakrishnan, SK, Ramachandran, S, Ray, RL, Reed, R, Ritter, HG, Roberts, JB, Rogachevskiy, OV, Romero, JL, Ruan, L, Rusnak, J, Rusnakova, O, Sahoo, NR, Sahu, PK, Salur, S, Sandweiss, J, Schambach, J, Schmah, AM, Schmidke, WB, Schmitz, N, Schweid, BR, Seck, F, Seger, J, Sergeeva, M, Seto, R, Seyboth, P, Shah, N, Shahaliev, E, Shanmuganathan, PV, Shao, M, Shen, F, Shen, WQ, Shi, SS, Shou, QY, Sichtermann, EP, Siejka, S, Sikora, R, Simko, M, Singh, J, Singha, S, Smirnov, D, Smirnov, N, Solyst, W, Sorensen, P, Spinka, HM, Srivastava, B, Stanislaus, TDS, Stewart, DJ, Strikhanov, M, Stringfellow, B, Suaide, AAP, Sugiura, T, Sumbera, M, Summa, B, Sun, XM, Sun, X, Sun, Y, Surrow, B, Svirida, DN, Szymanski, P, Tang, AH, Tang, Z, Taranenko, A, Tarnowsky, T, Thomas, JH, Timmins, AR, Tlusty, D, Todoroki, T, Tokarev, M, Tomkiel, CA, Trentalange, S, Tribble, RE, Tribedy, P, Tripathy, SK, Tsai, OD, Tu, B, Ullrich, T, Underwood, DG, Upsal, I, Buren, G Van, Vanek, J, Vasiliev, AN, Vassiliev, I, Videbæk, F, Vokal, S, Voloshin, SA, Vossen, A, Wang, F, Wang, G, Wang, P, Wang, Y, Wang, Y, Webb, JC, Wen, L, Westfall, GD, Wieman, H, Wissink, SW, Witt, R, Wu, Y, Xiao, ZG, Xie, G, Xie, W, Xu, J, Xu, N, Xu, QH, Xu, YF, Xu, Z, Yang, C, Yang, Q, Yang, S, Yang, Y, Ye, Z, Ye, Z, Yi, L, Yip, K, Yoo, I-K, Yu, N, Zbroszczyk, H, Zha, W, Zhang, J, Zhang, J, Zhang, L, Zhang, S, Zhang, S, Zhang, XP, Zhang, Y, Zhang, Z, Zhao, J, Zhong, C, Zhou, C, Zhu, X, Zhu, Z and Zyzak, M
(2018)
Improved measurement of the longitudinal spin transfer to $Λ$ and
$\bar Λ$ hyperons in polarized proton-proton collisions at $\sqrt s$ =
200 GeV.
Phys. Rev. D, 98 (11).
112009-.
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Abstract
The longitudinal spin transfer $D_{LL}$ to $\Lambda$ and $\bar{\Lambda}$
hyperons produced in high-energy polarized proton--proton collisions is
expected to be sensitive to the helicity distribution functions of strange
quarks and anti-quarks of the proton, and to longitudinally polarized
fragmentation functions. We report an improved measurement of $D_{LL}$ from
data obtained at a center-of-mass energy of $\sqrt{s}$ = 200 GeV with the STAR
detector at RHIC. The data have an approximately twelve times larger
figure-of-merit than prior results and cover $|\eta|<$ 1.2 in pseudo-rapidity
with transverse momenta $p_T$ up to 6 GeV/c. In the forward scattering
hemisphere at largest $p_T$, the longitudinal spin transfer is found to be
$D_{LL}$ = -0.036 $\pm$ 0.048 (stat) $\pm$ 0.013(sys) for $\Lambda$ hyperons
and $D_{LL}$ = 0.032 $\pm$ 0.043\,(stat) $\pm$ 0.013\,(sys) for $\bar{\Lambda}$
anti-hyperons. The dependences on $\eta$ and $p_T$ are presented and compared
with model evaluations.
Dimensions
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