Brian Francisco - b' analysis

Total events for b' mass of 650 GeV/c2 = 96,377

Total events for b' mass of 800 GeV/c2 = 103,365


We selected b'b' → bbHH → bbbbbb events by imposing condition of nbpartons = 6.

mb' = 650 GeV → 17,073 events → ( impose that b partons have pT > 30 GeV and |eta| < 2.4 → 9,521 events

mb' = 800 GeV → 18,149 events → ( impose that b partons have pT > 30 GeV and |eta| < 2.4 → 10,986 events


We then selected from these events the events in which there is 1 distinct jet matched to each b parton.

Restricted to events with 6 or 7 jets

mb' = 650 GeV → 5,493 events

mb' = 800 GeV → 5,864 events

Jets matched via ΔR < 0.3, with ΔR defined as √(Δφ2 + Δη2)

b partons matched to either 1 or 2 jets, and jets matched to either 0 or 1 b parton.

mb' = 650 GeV → 2,480 events

mb' = 800 GeV → 2,355 events


We then progressively applied the "loose" b-tagging requirement (Combined Secondary Vertex; >= 0.244)

b' mass 650 GeV b' mass 800 GeV
>= 0 bjet 2480 events 2354 events
>= 1 bjet 2470 events 2345 events
>= 2 bjet 2391 events 2274 events
>= 3 bjet 2048 events 1971 events
>= 4 bjet 1358 events 1232 events
>= 5 bjet 489 events 410 events



We then plotted the Ht of each event, the pT of the highest pT and second highest pT jet in each event, and the total number of jets per event.

The plots suggest utilizing a pT cut of 150-200 GeV for higher pT jets in events.


Event Acceptance

Event acceptance tested by removing b parton requirement. Events were chosen as:

  • Require 6 or 7 jets with pT > 30 and |eta| < 2.4 ( 45,103 events)
  • Require 4 or more jets to meet "loose" CSV b-tagging cut (bdisc >= 0.244) ( 16,691 events)
  • Highest pT jet in event must have pT > 150
  • Second highest pT jet in event must have pT > 100
b' mass for events is 650 GeV, total events 96,377. 17,073 with 6 b partons.

Events after cuts outlined above: 16,622

b partons per event

-- BrianAnthonyFrancisco - 23 Aug 2014

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng baccept_650.png r2 r1 manage 14.7 K 2014-08-25 - 23:00 BrianAnthonyFrancisco b partons per event for acceptance study (650 GeV)
PNGpng hijetpt_650.png r2 r1 manage 18.9 K 2014-08-25 - 16:43 BrianAnthonyFrancisco Highest and second highest pT jets in b' mass = 650 GeV events
PNGpng hijetpt_800.png r2 r1 manage 18.2 K 2014-08-25 - 16:44 BrianAnthonyFrancisco Highest and second highest pT jets in b' mass = 800 GeV events
PNGpng ht_650.png r1 manage 11.8 K 2014-08-25 - 20:57 BrianAnthonyFrancisco Ht in select events for b' mass = 650 GeV
PNGpng ht_800.png r1 manage 11.5 K 2014-08-25 - 20:57 BrianAnthonyFrancisco Ht in select events for b' mass = 800 GeV
PNGpng njets_650.png r1 manage 13.9 K 2014-08-25 - 20:58 BrianAnthonyFrancisco Number of jets in select events for b' mass = 650 GeV
PNGpng njets_800.png r1 manage 13.6 K 2014-08-25 - 20:58 BrianAnthonyFrancisco Number of jets in select events for b' mass = 800 GeV
Edit | Attach | Watch | Print version | History: r9 | r6 < r5 < r4 < r3 | Backlinks | Raw View | Raw edit | More topic actions...
Topic revision: r4 - 2014-08-25 - BrianAnthonyFrancisco
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Sandbox All webs login

  • Edit
  • Attach
This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2020 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback