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Aidala, C; Aphecetche, L; Barish, K N; Bassalleck, B; Bathe, S; Belikov, S; Bennett, R; Borel, H; Boyle, K; J -L Charvet; C -H Chen; Choi, I J; Choi, J B; Churyn, A; Chvala, O; Cianciolo, V; Citron, Z; Dietzsch, O; Dubey, A K; Durham, J M; D'Orazio, L; Edwards, S; En'yo, H; Fokin, S L; Fraenkel, Z; Fukao, Y; Gong, H; R Granier de Cassagnac; Gunji, T; A Hadj Henni; Haggerty, J S; Ichihara, T; Iwanaga, Y; Jones, T; Kamihara, N; Kamin, J; Kawall, D; Kawashima, M; Kempel, T; Kim, D J; Kim, E; Král, A; Kwon, Y; Lacey, R; Lee, D M; Lee, K S; X Li; Lichtenwalner, P; Liebing, P; Litvinenko, A; Love, B; Lynch, D; Malik, M D; Masui, H; Meredith, B; Mitchell, J T; Mohanty, A K; Murakami, T; Nagle, J L; Naglis, M; Nakagawa, I; Newby, J; Oakley, C; Oda, S X; Okada, K; Oskarsson, A; Pantuev, V; Park, S K; J -C Peng; Proissl, M; Rak, J; Ravinovich, I; Reygers, K; Rosati, M; Rosendahl, S S E; Rykov, V L; Seele, J; Shein, I; Sickles, A; Singh, C P; Slunečka, M; Staley, F; Stepanov, M; Ster, A; Sugitate, T; Sukhanov, A; Tanaka, Y; Taneja, S; Thomas, D; Togawa, M; Towell, R S; V-N Tram; Vazquez-Zambrano, E; Watanabe, K; Wright, R M; Wysocki, M; Yokkaichi, S; Young, G R; Zaudtke, O; Zhang, C
arXiv.org, 12/2013Paper
Measurements of transverse-single-spin asymmetries (\(A_{N}\)) in $p$$+$$p\( collisions at \)\sqrt{s}=\(62.4 and 200 GeV with the PHENIX detector at RHIC are presented. At midrapidity, \)A_{N}\( is measured for neutral pion and eta mesons reconstructed from diphoton decay, and at forward rapidities, neutral pions are measured using both diphotons and electromagnetic clusters. The neutral-pion measurement of \)A_{N}\( at midrapidity is consistent with zero with uncertainties a factor of 20 smaller than previous publications, which will lead to improved constraints on the gluon Sivers function. At higher rapidities, where the valence quark distributions are probed, the data exhibit sizable asymmetries. In comparison with previous measurements in this kinematic region, the new data extend the kinematic coverage in \)\sqrt{s}\( and \)p_T\(, and it is found that the asymmetries depend only weakly on \)\sqrt{s}\(. The origin of the forward \)A_{N}\( is presently not understood quantitatively. The extended reach to higher \)p_T\( probes the transition between transverse momentum dependent effects at low \)p_T\( and multi-parton dynamics at high \)p_T$.
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