Probing transverse momentum dependent gluon distribution functions from hadronic quarkonium pair production
Abstract
The inclusive hadronic production of ηQ(ηc or ηb) pair is proposed to extract the transverse momentum dependent(TMD) gluon distribution functions. We use nonrelativistic QCD(NRQCD) for the production of ηQ. 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.
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