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Adams, J. R.; Agakishiev, G.; Ajitanand, N. N.; Aoyama, R.; Ashraf, M. U.; Bai, X.; Behera, A.; Bhati, A. K.; Bhattarai, P.; Bielcikova, J.; Brown, D.; Bryslawskyj, J.; Butterworth, J.; Chang, Z.; Chatterjee, A.; Chattopadhyay, S.; Chen, J. H.; Christie, W.; Contin, G.; Dedovich, T. G.; Deppner, I. M.; Didenko, L.; Dilks, C.; Federic, P.; Fedorisin, J.; Flores, C. E.; Fujita, J.; Gibson, A.; Girard, M.; Herrmann, N.; Huang, T.; Jacobs, W. W.; Jiang, K.; Kalinkin, D.; Khan, Z.; Kochenda, L.; Kollegger, T.; Krauth, L.; Kwasizur, J. H.; Lauret, J.; Liu, F.; Liu, Y.; Lomnitz, M.; Margetis, S.; Meehan, K.; Mondal, M. M.; Nasim, Md; Nelson, J. M.; Niida, T.; Nonaka, T.; Odyniec, G.; Ogawa, A.; Oh, K.; Page, B. S.; Perkins, C.; Posik, M.; Rehbein, M. J.; Roth, J. D.; Rusnakova, O.; Shanmuganathan, P. V.; Shen, W. Q.; Shi, Z.; Shou, Q. Y.; Smirnov, N.; Solyst, W.; Stanislaus, T. D. S.; Stringfellow, B.; Summa, B.; Sun, Y.; Sun, X.; Sun, X. M.; Tang, Z.; Taranenko, A.; Tlusty, D.; Tokarev, M.; Tribble, R. E.; Tripathy, S. K.; Tsai, O. D.; Upsal, I.; Van Buren, G.; Voloshin, S. A.; Wang, G.; Wang, F.; Webb, J. C.; Westfall, G. D.; Wissink, S. W.; Xie, G.; Xie, W.; Xu, J.; Xu, Z.; Yang, Q.; Ye, Z.; Yi, L.; Yu, N.; Zbroszczyk, H.; Zhang, Z.; Zhang, J.; Zhang, X. P.; Zhang, J. B.; Zyzak, M.
Physical review. D, 2/2018, Letnik: 97, Številka: 3Journal Article
We report the first measurements of transverse single-spin asymmetries for inclusive jet and jet+π± production at midrapidity from transversely polarized proton-proton collisions at s=500 GeV. The data were collected in 2011 with the STAR detector sampled from 23 pb−1 integrated luminosity with an average beam polarization of 53%. Asymmetries are reported for jets with transverse momenta 6<pT<55 GeV/c and pseudorapidity |η|<1. Presented are measurements of the inclusive-jet azimuthal transverse single-spin asymmetry, sensitive to twist-3 initial-state quark-gluon correlators; the Collins asymmetry, sensitive to quark transversity coupled to the polarized Collins fragmentation function; and the first measurement of the “Collins-like” asymmetry, sensitive to linearly polarized gluons. Within the present statistical precision, inclusive-jet and Collins-like asymmetries are small, with the latter allowing the first experimental constraints on gluon linear polarization in a polarized proton. At higher values of jet transverse momenta, we observe the first nonzero Collins asymmetries in polarized-proton collisions, with a statistical significance of greater than 5σ. The results span a range of x similar to results from semi-inclusive deep-inelastic scattering but at much higher Q2. The Collins results enable tests of universality and factorization breaking in the transverse momentum-dependent formulation of perturbative quantum chromodynamics.
