A Boson Learned from its Context, and a Boson Learned from its End by Jeffrey Roskes

Author:Jeffrey Roskes
Language: eng
Format: epub
ISBN: 9783030580117
Publisher: Springer International Publishing

In addition, JHUGEN wraps the MCFM matrix element to generate offshell VBF and VH, vector boson scattering (VBS) and tri-vector-boson production (VVV), and their interference, including anomalous couplings. The JHUGEN code enables generation of LHE events for this process, which MCFM does not include. This is the most complicated process implemented in JHUGEN to date, and it uses several optimizations to make generation more efficient.

Figure 4.7 shows distributions of m 4ℓ for a new resonance with a mass of 1 with several signal, background, and interference components separated. Any search for this kind of resonance must take all of these components into account in determining the final distribution of mass and kinematics. Additionally, a new resonance will not necessarily interact with other particles with the same tensor structure as the Higgs boson. Its coupling structure can significantly change the final mass shape, as the figures show.

Fig. 4.7Differential cross section of the process VV →ZZ∕Zγ ∗∕γ ∗γ ∗→ 2ℓ2ℓ ′ (where ℓ, ℓ ′ = e, μ, or τ) as a function of invariant mass m 4ℓ generated with JHUGEN, including VBS and VVV background (bkg) and VBF+VH production of both the Higgs boson (H) and a hypothetical resonance X(1000). The contributions to the final differential cross section are shown isolated and combined. In all cases interference (I) of all contributing amplitudes is included. The left panel shows the scalar X hypothesis, and the right panel shows the XVV f a2 = 1 and f a3 = 1 hypotheses [30]

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