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

Leszek Adamczyk,J. K. Adkins,G. Agakishiev,Madan M. Aggarwal,Zubayer Ahammed,I. G. Alekseev, J. Alford,C. D. Anson,A. Aparin,D. Arkhipkin, E. C. Aschenauer,G. S. Averichev,A. Banerjee,D. R. Beavis,Rene Bellwied,Anju Bhasin, A. K. Bhati,P. Bhattarai,H. Bichsel,Jaroslav Bielcik,Jana Bielcikova,L. C. Bland,I. G. Bordyuzhin,W. Borowski,J. Bouchet,A. V. Brandin,S. G. Brovko,S. Bültmann,I. Bunzarov,T. P. Burton,J. Butterworth, H. Caines,M. Calderon De La Barca Sanchez,J. M. Campbell, D. Cebra,R. Cendejas,M. C. Cervantes,P. Chaloupka,Z. Chang,Sukalyan Chattopadhyay,H. F. Chen,J. H. Chen,Li-Yi Chen,J. Cheng,M. Cherney, A. Chikanian, W. Christie,Janusz Chwastowski,M. J.M. Codrington,Giacomo Contin,J. G. Cramer,H. J. Crawford, A. B. Cudd,Xiangyuan Cui,Sumit R. Das,A. Davila Leyva,L. C. De Silva,R. R. Debbe,T. G. Dedovich,Jian Deng,A. A. Derevschikov,R. Derradi de Souza,S. Dhamija,B. Di Ruzza,L. Didenko,C. Dilks, F. Ding,P. Djawotho,X. Dong, J. L. Drachenberg,J. E. Draper,C. M. Du,L. E. Dunkelberger,J. C. Dunlop,L. G. Efimov,J. Engelage,K. S. Engle, G. Eppley, L. Eun,Olga Evdokimov,O. Eyser, R. Fatemi,S. Fazio, J. Fedorisin, P. Filip,E. Finch,Y. Fisyak,C. E. Flores,C. A. Gagliardi, D. R. Gangadharan,D. Garand,Frank Jm Geurts,A. Gibson, M. R. Girard,Stephen V. Gliske,Leo Clifford Greiner, D. Grosnick, D. S. Gunarathne,Y. Guo,Anik Gupta

Physical Review Letters（2015）

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摘要

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.

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