Author/Authors :
Yamanishi، نويسنده , , T. and Morii، نويسنده , , T. and Roy، نويسنده , , D. and Sudoh، نويسنده , , K. and Tanaka، نويسنده , , S.، نويسنده ,
Abstract :
To test a possible color-octet contribution of heavy quarkonium productions, we propose ψ′-productions for small-pT regions, where the color-singlet ψ′ state cannot be produced by the gluon-gluon fusion owing to charge conjugation. We also point out that these processes are very useful to deduce informations of spin-dependent gluon distributions Δg.
