Status of HV Higgs decay Studies

1
Status of HV Higgs decay Studies

• First look at ATHENA output for Higgs production
  and decay to v-pions

2
Model

• gg?H0? ?v ?v (A0 is used as a stand in for ?v in
  PYTHIA)
• Underlying event, ISR, FSR turned on
• Higgs mass 140 GeV
• ?v mass 40 GeV
• ?v lifetime c?? 250 mm
• To date 400 events have been run through
  reconstruction
• This Analysis is done on 350 events
• Mean time per event 13 minutes
• Goal 500 events for this set of parameters

3
?v proper lifetime
?v proper lifetime
4
Muon Studies

• Next slides look at reconstructed muons
• Number of muons per event
• Muon Energy
• Muon Pt
• Muon Eta

5
Number of muons per event
No Et cut
6
Muon Energy
Overflow 3 ? with E gt 100 GeV
Muon Energy
MeV
7
Muon Pt
Overflow 4 ??with Pt gt 35 GeV
Muon Pt
MeV
8
Muon ?
Overflow 10 ? with ? gt 2.5
Muon ?
?
9
Jet Studies

• Jets found by ATHENA using cone algorithm using
  R0.7
• Number of tracks per jet
• Number of jets with no tracks
• Decay position of b jets
• ?? between jet and truth vs. b decay distance

10
Number of Tracks/jet
Number of tracks
11
Decay Position of all b jets
Radial decay position
12
Decay position of b jets with no tracks
Radial decay position
13
?? between trackless jet and truth
14
Delta Eta between jet (with any number of tracks)
and truth B decay in beam pipe
Decay dist lt 50mm
True jet (???? is found by taking the energy
weighted average of the (???) of the B
decay products
??
15
Delta Eta between jet and truthB decay in pixels
50 mm lt Decay dist gt 120mm
??
16
Delta Eta between jet and truthB decay in gap
between pixels and silicon
120 mm lt Decay dist gt 300mm
??
17
Delta Eta between jet and truthB decay in silicon
300 mm lt Decay dist gt 520mm
??
18
Delta Eta between jet and truthB decay in TRT
520 mm lt Decay dist gt 1030mm
??
19
Future work

• Access level 1 trigger information from ATHENA
• Get truth information from ATHENA reconstructed
  events into event viewer format
• Look at SM MC to find background to trackless
  jets
• In trackless jets look at ratio of pixel to
  silicon and TRT hits
• Explore L2 trigger for these events
• Provide Guido with data he can use in his trigger
  studies