Electroweak Higgs production with HiggsPO at NLO QCD

Abstract

We present the HiggsPO UFO model for Monte Carlo event generation of electroweak V H and VBF Higgs production processes at NLO in QCD in the formalism of Higgs pseudo-observables (PO). We illustrate the use of this tool by studying the QCD corrections, matched to a parton shower, for several benchmark points in the Higgs PO parameter space. We find that, while being sizable and thus important to be considered in realistic experimental analyses, the QCD higher-order corrections largely factorize. As an additional finding, based on the NLO results, we advocate to consider 2D distributions of the two-jet azimuthal-angle difference and the leading jet p T for new physics searches in VBF Higgs production. The HiggsPO UFO model is publicly available.

GUT Physics in the Era of the LHC

“…There are several proposals with scalar leptoquarks that address R K ( * ) and/or R D ( * ) [559,[561][562][563][564][565][566], some in the context of unified theories such as SU (5) Finally, moderately large leptoquark couplings dictated by the above LFU anomalies can be also observed in processes with virtual LQ exchange, typically in the t-channel, resulting in a final state with at least one charged lepton. Inspired by the abovementioned LFU anomalies, processes with final state leptons have been studied, which can probe LQ scenarios for LFU violation observed in B meson decays [585][586][587][588]. In this case, LQ Figure 16: Diagrams contributing to LFV processes, l − α → l − β γ (left) and l − α → l − β l − γ l + δ (centre and right) with X and X scalar or vector mediators and f and f fermions.…”

Can New Physics Hide inside the Proton?

“…These Wilson coefficients can be constrained from measurements ranging from Higgs, gauge boson, and electroweak precision observables [14][15][16][17] to top quark production [18,19], flavour observables [20,21], and low- * Electronic address: m.ubiali@damtp.cam.ac.uk energy processes [22], among others. In the case of LHC data, high-energy processes such as Drell-Yan, diboson, and top-quark production at large invariant masses [23][24][25][26][27][28][29] play a key role since energy-growing effects often enhance the sensitivity to the SMEFT contributions. Several of the high-energy LHC measurements that constrain the SMEFT parameter space are also used to provide stringent constraints on the proton's parton distribution functions (PDFs) [30,31].…”

Indirect and monojet constraints on scalar leptoquarks

“…At this point it is interesting to compare our findings with previous works that analyze indirect effects of leptoquarks at the LHC. For very large leptoquark masses their exchange in the t-channel can be encoded by four-fermion dimension-six operator [75][76][77]. This method has two shortcomings since it does not take into account properly the leptoquark interference with the SM contribution, as well as, the leptoquark propagator [76].…”