2016/04/30 by M. Chala, Christophe Grojean, C. Grojean +4
Physics and Astronomy · #Boson #Channel (broadcasting) #Computer science #Current (fluid) #Excited state #Gauge boson #Gauge theory #Gluon #Higgs boson #Large Hadron Collider #Neutral current #Nuclear physics #Parameter space #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Singlet state #Statistics #Vector boson #hep-ph
paper · pdf · doi:10.1016/j.physletb.2016.06.050
9 pages, 11 figures. V2: matches published version
openalex publication_date 2016/06/28 · arxiv created 2016/07/21 · arxiv updated 2016/07/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The recently observed excess in diphoton events at around 750 GeV can be satisfactorily described in terms of a new spin-0 real singlet with effective interactions to the gauge bosons. In this letter we first review the current constraints on this setup. We further explore the production in association with a gauge boson. We show the potential of this channel to unravel current flat directions in the allowed parameter space. We then study the potential of two different asymmetries for disentangling the CP nature of such a singlet in both gluon fusion and vector-boson fusion. For this matter, we perform an estimation of the efficiency for selecting signal and background events in eight different decay modes, namely 4 ℓ , 2 j 2 ℓ , 2 j ℓ E̸ T , 2 γ 2 j , 4 ℓ 2 j , 2 ℓ γ 2 j , 4 j 2 ℓ and 4 j ℓ E̸ T . We emphasize that the very different couplings of this new singlet to the Standard Model particles as well as the larger mass provide a distinctive phenomenology with respect to Higgs searches. We finally show that a large region of the parameter space could be tested within the current LHC run, the dominant channel being 2 γ 2 j .