Probing transverse momentum dependent gluon distribution functions from hadronic quarkonium pair production


The inclusive hadronic production of ηQ\eta_Q(ηc\eta_c or ηb\eta_b) pair is proposed to extract the transverse momentum dependent(TMD) gluon distribution functions. We use nonrelativistic QCD(NRQCD) for the production of ηQ\eta_Q. Under nonrelativistic limit TMD factorization for this process is assumed to make a lowest order calculation. For unpolarized initial hadrons, unpolarized and linearly polarized gluon distributions can be extracted by studying different angular distributions.Comment: 7 pages, 3 figures, 1 tabl

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