Three loop QCD results for the Pseudo-scalar Higgs boson production at the LHC
Vajravelu Ravindran (IMSc, Chennai)

We present the first results on the production of pseudo-scalar through gluon fusion at the LHC to threshold N3LO in QCD taking into account only soft gluon effects. We have used the effective Lagrangian that describes the coupling of pseudo-scalar with the gluons in the large top quark mass limit. We first present the computation of three loop pseudo-scalar form factor and then use use the available informations on the third order universal soft function in QCD to achieve this. In addition, we also present the process dependent resummation coefficient for threshold resummation to N3LL in QCD.
Phenomenological impact of these threshold N3LO corrections to pseudo-scalar production at the LHC is discussed and their role to reduce the renormalisation scale dependence is demonstrated.