Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at s = 200 GeV
Genre
Journal ArticleDate
2014-01-15Author
Adamczyk, LAdkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Alekseev, I
Alford, J
Anson, CD
Aparin, A
Arkhipkin, D
Aschenauer, EC
Averichev, GS
Balewski, J
Banerjee, A
Barber, B
Barnovska, Z
Beavis, DR
Bellwied, R
Betancourt, MJ
Bhasin, A
Bhati, AK
Bhattarai, P
Bichsel, H
Bielcik, J
Bielcikova, J
Bland, LC
Bordyuzhin, IG
Borowski, W
Bouchet, J
Brandin, AV
Bridgeman, A
Brovko, SG
Bültmann, S
Bunzarov, I
Burton, TP
Butterworth, J
Caines, H
Calderón De La Barca Sánchez, M
Cebra, D
Cendejas, R
Cervantes, MC
Chaloupka, P
Chang, Z
Chattopadhyay, S
Chen, HF
Chen, JH
Chen, L
Cheng, J
Cherney, M
Chikanian, A
Christie, W
Chwastowski, J
Codrington, MJM
Corliss, R
Cramer, JG
Crawford, HJ
Cui, X
Das, S
Davila Leyva, A
De Silva, LC
Debbe, RR
Dedovich, TG
Deng, J
Derevschikov, AA
Derradi De Souza, R
Dhamija, S
Di Ruzza, B
Didenko, L
Dilks, C
Ding, F
Dion, A
Djawotho, P
Dong, X
Drachenberg, JL
Draper, JE
Du, CM
Dunkelberger, LE
Dunlop, JC
Efimov, LG
Engelage, J
Engle, KS
Eppley, G
Eun, L
Evdokimov, O
Fatemi, R
Fazio, S
Fedorisin, J
Fersch, RG
Filip, P
Finch, E
Fisyak, Y
Flores, CE
Gagliardi, CA
Gangadharan, DR
Garand, D
Geurts, F
Gibson, A
Girard, M
Gliske, S
Grosnick, D
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http://hdl.handle.net/20.500.12613/5897
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10.1103/PhysRevD.89.012001Abstract
The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8<η<2.0 in polarized proton-proton collisions at s=200 GeV are presented. Neutral pions were detected using the end cap electromagnetic calorimeter in the STAR detector at RHIC. The cross section was measured over a transverse momentum range of 5<pT<16 GeV/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry ALL is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x≈0.01. The measured ALL is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry AL is also measured and found to be consistent with zero. The transverse single-spin asymmetry AN is measured over a previously unexplored kinematic range in Feynman-x and pT. Such measurements may aid our understanding of the onset and kinematic dependence of the large asymmetries observed at more forward pseudorapidity (η≈3) and their underlying mechanisms. The AN results presented are consistent with a twist-3 model prediction of a small asymmetry over the present kinematic range. © 2014 American Physical Society.Citation to related work
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Physical Review D - Particles, Fields, Gravitation and CosmologyADA compliance
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http://dx.doi.org/10.34944/dspace/5879