Precision Measurement of the Longitudinal Double-Spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at sqrt[s]=200  GeV

• Published in: Physical review letters Vol. 115; no. 9; p. 092002
• Main Authors: Adamczyk, L, Adkins, J K, Agakishiev, G, Aggarwal, M M, Ahammed, Z, Alekseev, I, Alford, J, Anson, C D, Aparin, A, Arkhipkin, D, Aschenauer, E C, Averichev, G S, Banerjee, A, Beavis, D R, Bellwied, R, Bhasin, A, Bhati, A K, Bhattarai, P, Bichsel, H, Bielcik, J, Bielcikova, J, Bland, L C, Bordyuzhin, I G, Borowski, W, Bouchet, J, Brandin, A V, Brovko, S G, Bültmann, S, Bunzarov, I, Burton, T P, Butterworth, J, Caines, H, Calderón de la Barca Sánchez, M, Campbell, J M, Cebra, D, Cendejas, R, Cervantes, M C, Chaloupka, P, Chang, Z, Chattopadhyay, S, Chen, H F, Chen, J H, Chen, L, Cheng, J, Cherney, M, Chikanian, A, Christie, W, Chwastowski, J, Codrington, M J M, Contin, G, Cramer, J G, Crawford, H J, Cudd, A B, Cui, X, Das, S, Davila Leyva, A, De Silva, L C, Debbe, R R, Dedovich, T G, Deng, J, Derevschikov, A A, Derradi de Souza, R, Dhamija, S, di Ruzza, B, Didenko, L, Dilks, C, Ding, F, Djawotho, P, Dong, X, Drachenberg, J L, Draper, J E, Du, C M, Dunkelberger, L E, Dunlop, J C, Efimov, L G, Engelage, J, Engle, K S, Eppley, G, Eun, L, Evdokimov, O, Eyser, O, Fatemi, R, Fazio, S, Fedorisin, J, Filip, P, Finch, E, Fisyak, Y, Flores, C E, Gagliardi, C A, Gangadharan, D R, Garand, D, Geurts, F, Gibson, A, Girard, M, Gliske, S, Greiner, L, Grosnick, D, Gunarathne, D S, Guo, Y, Gupta, A
• Format: Journal Article
• Language: English
• Published: United States 28.08.2015
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.115.092002

We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, A_{LL}, in polarized pp collisions at center-of-mass energy sqrt[s]=200  GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. The measured asymmetries provide evidence at the 3σ level for positive gluon polarization in the Bjorken-x region x>0.05.