Measurements of double-helicity asymmetries in inclusive J / ψ production in longitudinally polarized p + p collisions at s = 510 GeV

• Published in: Physical review. D 2016-12, Vol.94 (11), Article 112008
• Main Authors: Adare, A., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., Alfred, M., Apadula, N., Aramaki, Y., Asano, H., Atomssa, E. T., Awes, T. C., Azmoun, B., Babintsev, V., Bai, M., Bandara, N. S., Bannier, B., Barish, K. N., Bathe, S., Bazilevsky, A., Beaumier, M., Beckman, S., Belmont, R., Berdnikov, A., Berdnikov, Y., Black, D., Blau, D. S., Bok, J. S., Boyle, K., Brooks, M. L., Bryslawskyj, J., Buesching, H., Bumazhnov, V., Campbell, S., Chen, C.-H., Chi, C. Y., Chiu, M., Choi, I. J., Choi, J. B., Chujo, T., Citron, Z., Csanád, M., Csörgő, T., Danley, T. W., Datta, A., Daugherity, M. S., David, G., DeBlasio, K., Dehmelt, K., Denisov, A., Deshpande, A., Desmond, E. J., Ding, L., Dion, A., Diss, P. B., Do, J. H., Drees, A., Drees, K. A., Durham, J. M., Durum, A., Enokizono, A., En’yo, H., Esumi, S., Fadem, B., Feege, N., Fields, D. E., Finger, M., Fokin, S. L., Frantz, J. E., Franz, A., Frawley, A. D., Gal, C., Gallus, P., Garg, P., Ge, H., Giordano, F., Glenn, A., Goto, Y., Grau, N., Greene, S. V., Grosse Perdekamp, M., Gu, Y., Gunji, T., Guragain, H., Hachiya, T., Haggerty, J. S., Hahn, K. I., Hamagaki, H., Hamilton, H. F., Han, S. Y., Hanks, J., Hasegawa, S., Haseler, T. O. S., Hashimoto, K., He, X., Hemmick, T. K., Hill, J. C., Hollis, R. S., Homma, K., Hong, B., Hoshino, T.
• Format: Article
• Language: English
• Subjects: Asymmetry; Collision dynamics; Gluons; Heavy ions; Helicity; NUCLEAR PHYSICS AND RADIATION PHYSICS; Polarization; Quarks; Rangefinding; Relativistic Heavy Ion Collider; Spectrometers; Transverse momentum
• ISSN: 2470-0010; 2470-0029
• DOI: 10.1103/PhysRevD.94.112008

We report the double-helicity asymmetry, ALLJ/ψ, in inclusive J/ψ production at forward rapidity as a function of transverse momentum pT and rapidity |y|. The data analyzed were taken during s=510  GeV longitudinally polarized p+p collisions at the Relativistic Heavy Ion Collider in the 2013 run using the PHENIX detector. At this collision energy, J/ψ particles are predominantly produced through gluon-gluon scatterings, thus ALLJ/ψ is sensitive to the gluon polarization inside the proton. We measured ALLJ/ψ by detecting the decay daughter muon pairs μ+μ− within the PHENIX muon spectrometers in the rapidity range 1.2