# 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 4th highest pT and lowest pT jet in each event, and the total number of jets per event.

## Event Acceptance

b' mass for events is 650 GeV, total events 96,377. 17,073 events with 6 b partons.

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)
• 4th highest pT jet in event must have pT > 80
• Lowest pT jet in event must have pT > 40
Events after cuts outlined above: 8,711(650 GeV) ; 8,871(800 GeV)

A second study:

• Require 6 or 7 jets with pT > 30 and |eta| < 2.4 ( 45,103 events)
• Require 6 jets to meet "loose" CSV b-tagging cut (bdisc >= 0.244)
• 4th highest pT jet in event must have pT > 80
• Lowest pT jet in event must have pT > 40
Events after cuts outlined above: 735(650 GeV) ; 677(800 GeV)

Then we removed the jet pT requirements and simply made an Ht cut of Ht > 800 on events with >= 4 bjet, >=5 bjet, and = 6 bjet. (Again, b-jets via CSV >0.244). The number(s) of events with 6 b partons were adjusted to fit the accurate Higgs branching ratio. This was done by multiplying by a factor of (0.577^2) / (0.421^2) = 1.878

Events with 4 b-jets and Ht > 800: 15,788(650 GeV) ; 15,706(800 GeV)

Cut events with 6 b partons: 6,261(650 GeV) ; 6,253(800 GeV)

With Hbb branching correction (0.421 to 0.577): 11,758(650 GeV) ; 11,743(800 GeV)

Events with 5 b-jets and Ht > 800: 5,881(650 GeV) ; 5,755(800 GeV)

Cut events with 6 b partons: 3,560(650 GeV) ; 3,434(800 GeV)

With Hbb branching correction (0.421 to 0.577): 6,686(650 GeV) ; 6,449(800 GeV)

Events with 6 b-jets and Ht > 800: 1,278(650 GeV) ; 1,181(800 GeV)

Cut events with 6 b partons: 1,020(650 GeV) ; 919(800 GeV)

With Hbb branching correction (0.421 to 0.577): 1,916(650 GeV) ; 1,726(800 GeV)

### Actual Data

With luminosity of 23 (fb)^-1; and given cross sections for b' b' pairs at 650 GeV (100 fb) and 800 GeV (21.3 fb). Expectations are as follows

(650 GeV) b' b' events : 2,300

Both Higgs particles branch to bb (bbbbbb) : 766

Events with 4 bjets, Ht > 800 and 6 b partons : 280

Events with 5 bjets, Ht > 800 and 6 b partons : 159

Events with 6 bjets, Ht > 800 and 6 b partons : 45

(800 GeV) b' b' events : 490

Both Higgs particles branch to bb (bbbbbb) : 163

Events with 4 bjets, Ht > 800 and 6 b partons : 55

Events with 5 bjets, Ht > 800 and 6 b partons : 30

Events with 6 bjets, Ht > 800 and 6 b partons : 8

-- BrianAnthonyFrancisco - 23 Aug 2014

Topic attachments
I Attachment History Action Size Date Who Comment
png baccept6jet_650.png r1 manage 13.4 K 2014-08-27 - 20:59 BrianAnthonyFrancisco b partons per event with 6 bjets and jet pT cuts (b' mass 650 GeV)
png baccept6jet_800.png r1 manage 13.0 K 2014-08-27 - 20:57 BrianAnthonyFrancisco b partons per event with 6 bjets and jet pT cuts (b' mass 800 GeV)
png bacceptHt4_650.png r2 r1 manage 14.8 K 2014-08-27 - 20:55 BrianAnthonyFrancisco b partons per event with 4 bjets and Ht cut (b' mass 650 GeV)
png bacceptHt4_800.png r1 manage 14.8 K 2014-08-27 - 20:58 BrianAnthonyFrancisco b partons per event with 4 bjets and Ht cut (b' mass 800 GeV)
png bacceptHt5_650.png r1 manage 14.4 K 2014-08-27 - 20:56 BrianAnthonyFrancisco b partons per event with 5 bjets and Ht cut (b' mass 650 GeV)
png bacceptHt5_800.png r1 manage 14.3 K 2014-08-27 - 20:58 BrianAnthonyFrancisco b partons per event with 5 bjets and Ht cut (b' mass 800 GeV)
png bacceptHt6_650.png r2 r1 manage 13.2 K 2014-08-27 - 20:56 BrianAnthonyFrancisco b partons per event with 6 bjets and Ht cut (b' mass 650 GeV)
png bacceptHt6_800.png r1 manage 14.6 K 2014-08-27 - 20:58 BrianAnthonyFrancisco b partons per event with 6 bjets and Ht cut (b' mass 800 GeV)
png baccept_650.png r6 r5 r4 r3 r2 manage 14.6 K 2014-08-26 - 21:07 BrianAnthonyFrancisco b partons per event for acceptance study (650 GeV)
png baccept_800.png r1 manage 14.6 K 2014-08-27 - 20:57 BrianAnthonyFrancisco b partons per event with 4 bjets and jet pT cuts (b' mass 800 GeV)
png 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
png 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
png hilojetpt_650.png r2 r1 manage 17.4 K 2014-08-26 - 18:11 BrianAnthonyFrancisco pT of 4th highest and lowest pT jets in b' mass = 650 GeV events
png hilojetpt_800.png r2 r1 manage 16.8 K 2014-08-26 - 18:11 BrianAnthonyFrancisco pT of 4th highest and lowest pT jets in b' mass = 800 GeV events
png ht_650.png r2 r1 manage 11.5 K 2014-08-26 - 18:15 BrianAnthonyFrancisco Ht in select events for b' mass = 650 GeV
png ht_800.png r2 r1 manage 11.3 K 2014-08-26 - 18:12 BrianAnthonyFrancisco Ht in select events for b' mass = 800 GeV
png njets_650.png r2 r1 manage 13.7 K 2014-08-26 - 18:12 BrianAnthonyFrancisco Number of jets in select events for b' mass = 650 GeV
png njets_800.png r2 r1 manage 13.1 K 2014-08-26 - 18:13 BrianAnthonyFrancisco Number of jets in select events for b' mass = 800 GeV
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Topic revision: r7 - 2014-08-28 - BrianAnthonyFrancisco

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