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    Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at s = 200 GeV

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    Genre
    Journal Article
    Date
    2014-01-15
    Author
    Adamczyk, L
    Adkins, 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
    Show allShow less
    Subject
    nucl-ex
    nucl-ex
    hep-ex
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5897
    
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    DOI
    10.1103/PhysRevD.89.012001
    Abstract
    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
    American Physical Society (APS)
    Has part
    Physical Review D - Particles, Fields, Gravitation and Cosmology
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    For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5879
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