Speaker
Description
The production of a Higgs boson in association with a jet is one of the most important processes
studied at the LHC. It serves as a sensitive probe of high-energy dynamics and provides a
powerful testing ground for the Standard Model, while also offering sensitivity to possible new
physics effects. In phenomenological analyses, loop-induced contributions are often
approximated using effective frameworks such as the Higgs Effective Field Theory (HEFT) or
the Standard Model Effective Field Theory (SMEFT), which greatly simplify the calculations.
However, the reliability of these approximations must be carefully evaluated, particularly in
kinematic regimes characterized by large momentum transfer.
In this work, we perform a simulation-level analysis of Higgs plus jet production at √s = 13 TeV.
We compare predictions obtained from the full loop-induced Standard Model with those derived
within the HEFT and SMEFT frameworks. Taking the Higgs transverse momentum as a key
observable, we study normalized distributions, ratio spectra, and integrated deviations above
various transverse-momentum thresholds to quantitatively assess the validity of the effective
descriptions.
Our results show that effective approaches successfully reproduce the Standard Model behavior
in the low transverse-momentum region. However, sizable deviations emerge at high p
,
signaling the breakdown of the effective approximation. These findings highlight the importance
of carefully accounting for kinematic effects when applying EFT-based methods to precision
Higgs studies and provide a quantitative estimate of their range of validity.