Séminaires LAPP
Making The Most Of MET: Mass Reconstruction From Collimated Decays
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Europe/Paris
Auditorium Marcel Vivargent (LAPP)
Auditorium Marcel Vivargent
LAPP
Description
After a general introduction to the discovery of particles at
colliders I will discuss the complications arising from invisible
particles $\chi$.
At hadron colliders such particles can be inferred only through
observation of the transverse component of the vectorial sum of their
momenta -- missing $E_T$ or MET -- preventing reconstruction of the
masses of their mother particles.
However in the context of boosted decays, collimation of the decay
products gives information about the expected direction of invisible
particles, allowing one to make the most of MET by decomposing it into
the expected separate contributions.
Each of these may be promoted to a full four-momentum approximating
the associated $\chi$.
Judiciously chosen pairings of the reconstructed $\chi$ with other
visible objects in the event can lead to sharp mass peaks.
I will explain the broad applicability of such an analysis to a host
of different new physics signals, including more concretely four
supersymmetric scenarios, mentioning briefly their respective
theoretical motivations.
Results will be shown for an illustrative case: the gauge-mediation
decay of squarks to neutralinos to gravitinos.