why ILD card do not contain a efficiency formula for the b tagging?

[Li Huang]

hello,

why the ILD card does not contain the following efficiency formula for the b-tagging:

# default efficiency formula (misidentification rate)

add EfficiencyFormula {0} {0.001}

# efficiency formula for c-jets (misidentification rate)
add EfficiencyFormula {4} {0.05}

# efficiency formula for b-jets
add EfficiencyFormula {5} {0.75}

These formula are existing for the b-tagging in other detectors such as ATLAS and CMS.

Thanks!

[Michele Selvaggi]

Hi,

I am not sure what you referring to but the efficiency formula for CMS and ATLAS are different wrt to what you mention:

​https://github.com/delphes/delphes/blob/master/cards/delphes_card_ATLAS.tcl
​https://github.com/delphes/delphes/blob/master/cards/delphes_card_CMS.tcl

You can check that for a pt of ~ 80 GeV you'll get eff ~ 75%.

Anyway, since the efficiency in the ILD card in taken from that of CMS, you are free to take whatever value you chose. Keep in mind however that having a flat b-tagging efficiency is dangerous, especially if you go to very high energy where the b-tagging efficiency typically drops.

Michele

[Michele Selvaggi]

You are probably using some older version:

I suggest you take the latest Delphes version from github:

git clone https://github.com/delphes/delphes.git