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  • Longitudinal double-spin as...
    Abdallah, M. S.; Adam, J.; Aggarwal, I.; Atetalla, F. G.; Attri, A.; Behera, A.; Bhagat, P.; Bhasin, A.; Chen, J.; Chen, J. H.; Cheng, J.; Choudhury, S.; Christie, W.; Chu, X.; Crawford, H. J.; Daugherity, M.; Deppner, I. M.; Di Carlo, L.; Engelage, J.; Fazio, S.; Filip, P.; Fulek, L.; Gopal, K.; Gou, X.; Grosnick, D.; Guryn, W.; Hamad, A. I.; He, Y.; Hu, Y.; Huang, H. Z.; Huang, S. L.; Huang, T.; Huang, Y.; Isenhower, D.; Jacobs, W. W.; Jentsch, A.; Ji, Y.; Judd, E. G.; Kalinkin, D.; Kang, K.; Kechechyan, A.; Kikoła, D. P.; Kimelman, B.; Kincses, D.; Kiselev, A.; Kochenda, L.; Kravtsov, P.; Lebedev, A.; Li, W.; Lin, Y.; Liu, T.; Liu, X.; Ma, L.; Ma, R.; Magdy, N.; Mallick, D.; Nagy, M.; Nam, J. D.; Nie, M.; Nigmatkulov, G.; Odyniec, G.; Pawlowska, D.; Porter, J.; Posik, M.; Prozorova, V.; Pruthi, N. K.; Quintero, A.; Robotkova, M.; Sahoo, N. R.; Salur, S.; Schweid, B. R.; Sergeeva, M.; Seto, R.; Seyboth, P.; Shahaliev, E.; Shanmuganathan, P. V.; Shao, M.; Singh, J.; Söhngen, Y.; Solyst, W.; Srivastava, B.; Stringfellow, B.; Tlusty, D.; Tokarev, M.; Trentalange, S.; Tu, Z.; Underwood, D. G.; Upsal, I.; Van Buren, G.; Vanek, J.; Vassiliev, I.; Verkest, V.; Vokal, S.; Wang, Z.; Wieman, H.; Xu, Y.; Yip, K.; Zhang, S.; Zhang, X. P.; Zhang, Z. J.

    Physical review. D, 05/2021, Letnik: 103, Številka: 9
    Journal Article

    We report high-precision measurements of the longitudinal double-spin asymmetry, ALL, for midrapidity inclusive jet and dijet production in polarized p p collisions at a center-of-mass energy of √ s = 200 GeV . The new inclusive jet data are sensitive to the gluon helicity distribution, Δg (x, Q2), for gluon momentum fractions in the range from x ≃ 0.05 to x ≃ 0.5, while the new dijet data provide further constraints on the x dependence of Δ g (x , Q2). The results are in good agreement with previous measurements at √ s = 200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δg(x,Q2) is positive for x > 0.05.