Merged Higgs

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Where one or more Higgs from b'b' $\rightarrow$ bbHH $\rightarrow$ bbbbbb events has their two bjets merge.

Single Merged Higgs

Events selected as (for b' mass of 800 GeV):

103,365 Total Events

b partons with $p_{\rm T}$ > 30 and |$\eta$| < 2.4 == 6 ( 10,986 events)

$n_{Jets}$ with $p_{\rm T}$ > 30 and |$\eta$| < 2.4 == 5 or 6 ( 5,962 events)

Then we filtered through looking for events in which a Higgs has its two daughter b partons merge into a single jet.

We matched the Higgs particles to jets with a $\Delta$R < 0.03

Events were rejected if:

• More than one Higgs had a match (keeping to the single merged Higgs case) ( 267 events rejected)
• Neither Higgs was able to find a jet match ( 3,776 events rejected)
• A single Higgs was matched to more than one jet ( 0 events rejected)

Then we began jet matching to b partons. Again, there was criteria for excluding events:

• If a single b parton had no matched jet ( 0 events rejected)
• If a single b parton had more than 2 matched jets ( 0 events rejected)

It is important to note that only the remaining 4 b partons after ignoring the two daughters of the matched Higgs were included in the jet matching process.

From the remaining 1,919 events, we plotted the $H_{\rm T}$ of the events and the number of jets meeting the $p_{\rm T}$ and |$\eta$| requirements.

$H_{\rm T}$ of events with a single merged Higgs

$p_{\rm T}$ of leading $p_{\rm T}$ jet in single merged Higgs events

Mass of leading $p_{\rm T}$ jet in single merged Higgs events

$p_{\rm T}$ of lowest $p_{\rm T}$ jet in single merged Higgs events

$p_{\rm T}$ of jet matched to Higgs in single merged Higgs events

Mass of jet matched to Higgs in single merged Higgs events

$p_{\rm T}$ of jets not matched to Higgs in single merged Higgs events

• Compare to:
• $p_{\rm T}$ of jets in events with no merged Higgs

Number of Jets in events with a single merged Higgs

Double Merged Higgs

Events selected as (for b' mass of 800 GeV):

103,365 Total Events

b partons with $p_{\rm T}$ > 30 and |$\eta$| < 2.4 == 6 ( 10,986 events)

$n_{Jets}$ with $p_{\rm T}$ > 30 and |$\eta$| < 2.4 == 4 or 5 ( 3,208 events)

Then we filtered through looking for events in both Higgs each have both of their two daughter b partons merge into a single jet.

We matched the Higgs particles to jets with a $\Delta$R < 0.03

Events were rejected if:

• Neither Higgs was able to find a jet match ( - events rejected)
• A single Higgs was matched to more than one jet ( - events rejected)

Then we began jet matching to b partons. Again, there was criteria for excluding events:

• If a single b parton had no matched jet ( 0 events rejected)
• If a single b parton had more than 2 matched jets ( 0 events rejected)

It is important to note that only the remaining 2 b partons after ignoring the four total daughters of the matched Higgses were included in the jet matching process.

From the remaining 371 events, we plotted the $H_{\rm T}$ of the events and the number of jets meeting the $p_{\rm T}$ and |$\eta$| requirements.

$H_{\rm T}$ of events with a double merged Higgs

$p_{\rm T}$ of leading $p_{\rm T}$ jet in double merged Higgs events

$p_{\rm T}$ of lowest $p_{\rm T}$ jet in double merged Higgs events

$p_{\rm T}$ of jets matched to Higgs in double merged Higgs events

$p_{\rm T}$ of jets not matched to Higgs in double merged Higgs events

Number of Jets in events with a single merged Higgs

-- BrianAnthonyFrancisco - 04 Sep 2014