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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4077
DTSTART:20160405T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260307T060648Z
LAST-MODIFIED:20160210T140921Z
LOCATION:5280
SUMMARY:Lepton Jets from Radiating Dark Matter\, Theory Seminar (High 
 Energy/Cosmology)\, Malte Buschmann\, Fermilab
DESCRIPTION:The idea that dark matter forms part of a larger dark sect
 or is very intriguing\, given the high degree of complexity of the vis
 ible sector. We discuss lepton jets as a promising signature of an ext
 ended dark sector. As a simple toy model\, we consider an O(GeV) DM fe
 rmion coupled to a new U(1)' gauge boson (dark photon) with a mass of 
 order GeV and kinetically mixed with the Standard Model photon. Dark m
 atter production at the LHC in this model is typically accompanied by 
 collinear radiation of dark photons whose decay products can form lept
 on jets. We analyze the dynamics of collinear dark photon emission bot
 h analytically and numerically. In particular\, we derive the dark pho
 ton energy spectrum using recursive analytic expressions\, using Monte
  Carlo simulations in Pythia\, and using an inverse Mellin transform t
 o obtain the spectrum from its moments. In the second part\, we simula
 te the expected lepton jet signatures from radiating dark matter at th
 e LHC\, carefully taking into account the various dark photon decay mo
 des and allowing for both prompt and displaced decays. Using these sim
 ulations\, we recast two existing ATLAS lepton jet searches to signifi
 cantly restrict the parameter space of extended dark sector models\, a
 nd we compute the expected sensitivity of future LHC searches.
URL:https://www.physics.wisc.edu/events/?id=4077
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