Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV

Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV

The PHENIX experiment presents results from the RHIC 2006 run with polarized proton collisions at sqrt(s) = 62.4 GeV for inclusive pi^0 production at mid-rapidity. Unpolarized cross section results are measured for transverse momenta p_T = 0.5 to 7 GeV/c. Next-to-leading order perturbative quantum c...

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Veröffentlicht in:Physical review. D 2009, Vol.79
Hauptverfasser: Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N.N., Akiba, Y., Al-Bataineh, H., Alexander, J., Aoki, K., Aphecetche, Laurent, Asai, J., Atomssa, E. T., Averbeck, R., Awes, T.C., Azmoun, B., Babintsev, V., Bai, M., Baksay, G., Baksay, L., Baldisseri, A., Barish, K.N., Barnes, P.D., Bassalleck, B., Basye, A.T., Bathe, S., Batsouli, S., Baublis, V., Baumann, Cédric, Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, A., Berdnikov, Y., Bickley, A.A., Boissevain, J.G., Borel, H., Boyle, K., Brooks, M.L., Buesching, H., Bumazhnov, V., Bunce, G., Butsyk, S., Muñoz Camacho, C., Campbell, S., Chand, P., Chang, B.S., Chang, W.C., Charvet, J.-L., Chernichenko, S., Chi, C.Y., Chiu, M., Choi, I.J., Choudhury, R.K., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cole, B.A., Constantin, P., Csan'Ad, M., Cs¨org˝o, T., Dahms, T., Dairaku, S., Das, K., David, G., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E.J., Dietzsch, O., Dion, A., Donadelli, M., Drapier, O., Drees, A., Drees, K.A., Dubey, A.K., Durum, A., Dutta, D., Dzhordzhadze, V., Efremenko, Y.V., Egdemir, J., Ellinghaus, F., Engelmore, T., Enokizono, A., En'Yo, H., Esumi, S., Eyser, K.O., Fadem, B., Fields, D.E., Finger, M., Fleuret, F., Fokin, S.L., Fraenkel, Z., Frantz, J.E., Franz, A., Frawley, A.D., Fujiwara, K., Fukao, Y., Fusayasu, T., Garishvili, I., Glenn, A.
Format: Artikel
Sprache:eng
Schlagworte:
High Energy Physics - Experiment
Physics
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Zusammenfassung:The PHENIX experiment presents results from the RHIC 2006 run with polarized proton collisions at sqrt(s) = 62.4 GeV for inclusive pi^0 production at mid-rapidity. Unpolarized cross section results are measured for transverse momenta p_T = 0.5 to 7 GeV/c. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. Double helicity asymmetries A_LL are presented for p_T = 1 to 4 GeV/c and probe the higher range of Bjorken_x of the gluon (x_g) with better statistical precision than our previous measurements at sqrt(s)=200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06 < x_g < 0.4.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.79.012003