Speaker
Description
We study the Standard model (SM) Higgs production in association with a Z-boson at the LHC. The leading contribution comes from $q\bar{q}$-initiated (DY-like) subprocess. In addition to this, the gluon fusion subprocess via fermion loops also contributes to this process at higher orders in QCD. In this work, we study the impact of higher-order QCD corrections and provide precise results for this $ZH$ production process in hadron collisions. We use the third-order soft virtual results for the DY type of process. Using the universality of the threshold production, we extract the process-dependent coefficients and resum large threshold logarithms to N$^3$LL level. We find the scale uncertainty gets reduced to as small as $0.4\%$, for the conventional variation of unphysical renormalization and factorization scales.
Besides, we also study the gluon initiated subprocess for ZH production, which formally contributes from NNLO onwards in QCD. Being loop induced process, the higher order corrections to this gluon fusion subprocess are difficult to compute. We estimate the size of the NLO QCD corrections to this subprocess and study the impact of the threshold logarithms in the high invariant mass region. We give the numerical predictions for the invariant mass distribution and the total production cross sections for different center of mass energies at hadron colliders.
| Session | Higgs Physics |
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