We show how an excess in the diphoton channel can be the effect of neither a resonance nor an end point in acascade decay, but rather of a threshold for virtual production of a pair of extra quarks, each with half of peak invariant mass, onsetting in both the gg-initiated production and the gamma gamma-induced decay of an off-shell Z boson. For our analysis we consider as a paradigmatic example the 750 GeV excess previously seen at the end of 2015 with the run 2 data of the LHC but not confirmed with 2016 data.
750 GeV threshold to a new particle world
Panizzi L
2017-01-01
Abstract
We show how an excess in the diphoton channel can be the effect of neither a resonance nor an end point in acascade decay, but rather of a threshold for virtual production of a pair of extra quarks, each with half of peak invariant mass, onsetting in both the gg-initiated production and the gamma gamma-induced decay of an off-shell Z boson. For our analysis we consider as a paradigmatic example the 750 GeV excess previously seen at the end of 2015 with the run 2 data of the LHC but not confirmed with 2016 data.File in questo prodotto:
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