- #1

ChrisVer

Gold Member

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I was looking for ATLAS detector parts resolutions (momentum for Inner Detector and Energy for the CAL systems).

Does anyone have a nice reference?

So far I found something like this for the ID:

[itex] \sigma_{1/p_T} = 0.34 \text{TeV}^{-1} \Big(1 \oplus \frac{44 \text{GeV}}{p_T} \Big) [/itex]

With ##\oplus## meaning that the two terms are added in quadrature and then the square root is taken.

However this formula was from Run1 and before the installation of the B-Layer.

Has the last altered this expression?

Similarily for the ECAL:

[itex] \frac{\sigma_E}{E(\text{GeV})} = \frac{a}{\sqrt{E(\text{GeV})}} \oplus b[/itex]

[itex]a_{\text{design}}=10 \%[/itex]

[itex]b_{\text{design}}=0.7 \%[/itex]

or from tests on e, μ and pions:

[itex]a_{\text{exper}}=10.7 \%[/itex]

[itex]b_{\text{exper}}=0.5 \%[/itex]

(http://iopscience.iop.org/article/10.1088/1748-0221/3/08/S08003/meta)

Do you know if they have changed (ref)?

I don't think that the dependencies will be changed (1/p or sqrt(1/E) ) but the numbers in front probably have.

Thanks.