Transverse single-spin asymmetry and cross section for π0 and η mesons at large Feynman x in p →
+p collisions at √s=200GeV
Measurements of the differential cross section and the transverse single-spin asymmetry, A N, vs x F for π0 and η mesons are reported for 0.4<0.75 at an average pseudorapidity of 3.68. A data sample of approximately 6.3pb -1 was analyzed, which was recorded during p →+p collisions at √s=200GeV by the STAR experiment at RHIC. The average transverse beam polarization was 56%. The cross section for π0, including the previously unmeasured region of x F>0.55, is consistent with a perturbative QCD prediction, and the η/π0 cross-section ratio agrees with existing midrapidity measurements. For 0.55<0.75, the average A N for η is 0.210±0.056, and that for π0 is 0.081±0.016. The probability that these two asymmetries are equal is ∼3%. © 2012 American Physical Society.
Adamczyk, L; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alakhverdyants, AV; Alekseev, I; Alford, J; Anderson, BD; Anson, CD; Arkhipkin, D; Aschenauer, E; Averichev, GS; Balewski, J; Bannerjee, A; Barnovska, Z; Beavis, DR; Bellwied, R; Betancourt, MJ; Betts, RR; Bhasin, A; Bhati, AK; Bichsel, H; Bielcik, J; Bielcikova, J; Bordyuzhin, IG; Borowski, W; Bouchet, J; Brandin, AV; Brovko, SG; Bruna, E; Bueltmann, S; Bunzarov, I; Burton, TP; Butterworth, J; Cai, XZ; Caines, H; Calderón De La Barca Sánchez, M; Cebra, D; Cendejas, R; Cervantes, MC; Chaloupka, P; Chattopadhyay, S; Chen, HF; Chen, JH; Chen, JY; Chen, L; Cheng, J; Cherney, M; Chikanian, A; Christie, W; Chung, P; Chwastowski, J; Codrington, MJM; Corliss, R; Cramer, JG; Crawford, HJ; Cui, X; Davila Leyva, A; De Silva, LC; Debbe, RR; Dedovich, TG; Deng, J; Derradi De Souza, R; Dhamija, S; Didenko, L; Ding, F; Dion, A; Djawotho, P; Dong, X; Drachenberg, JL; Draper, JE; Du, CM; Dunkelberger, LE; Dunlop, JC; Efimov, LG; Elnimr, M; Engelage, J; Eppley, G; Eun, L; Evdokimov, O; Fatemi, R; Fazio, S; Fedorisin, J; Fersch, RG; Filip, P; Finch, E; Fisyak, Y; Gagliardi, CA; Gangadharan, DR; Geurts, F; Gliske, S; Gorbunov, YN; Grebenyuk, OG; Grosnick, D; Gupta, S; Guryn, W; Haag, B; Hajkova, O; Hamed, A; Han, LX
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