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The radiation valley and exotic resonances in Wγ production at the LHC

2020; Springer Nature; Volume: 2020; Issue: 3 Linguagem: Inglês

10.1007/jhep03(2020)117

1127-2236

Rodolfo Capdevilla, Roni Harnik, A. Martin,

Cosmology and Gravitation Theories

A bstract The tree-level partonic angular distribution of Standard Model Wγ production possesses a feature known as the Radiation Amplitude Zero (RAZ) where destructive interference causes the cross section to vanish. At the proton level the exact cancellation disappears, however, one can find a dip in the central region of the angular distributions, here called the Radiation Valley (RV). In this paper, we show how the sensitivity for W (ℓ v ) γ resonances can be significantly improved if one focuses on events in the RV region. Using this technique, we find that the LHC could probe a larger range of resonance masses, equivalent to increasing the luminosity by a factor of 2–3 over conventional searches. The exact increase depends on the spin of the Wγ resonance and exactly how it couples to electroweak gauge bosons.