Electrons at high eta

1. Oct 13, 2015

ChrisVer

Is it possible to ID an electron in ATLAS if it did not leave a track in the tracking system?
I think that the coverage of the tracker is : $| \eta | < 2.0$ (TRT) or $2.5$ (SCT)
for example an event of W+jet would result in Missing Transverse Energy alone + jet if the electron was to leave from $\eta$ let's say 4.0 (I'm being extreme)

On the other hand I was told there was a technique/algorithm that is able to ID those electrons too... but I don't think I understand how.... what such an electron would give is :
1. no track
2. energy deposit in the CAL system
pretty much like the photon, right?

2. Oct 13, 2015

Staff: Mentor

"One of the strengths of the ATLAS detector is its ability to detect electromagnetic objects, even beyond the coverage of the tracking (| η | < 2.5), up to | η | < 4.9 through the EM Forward calorimeter."
Google hit for "atlas very forward electrons"

Forward electrons are harder than electrons with tracks and W is harder than Z, so I would not expect a good accuracy, but it should be possible to see something.

3. Oct 14, 2015

RGevo

One could always study electrons at Lhcb.

If you were interested in forward w+jets, this can also be studied there - http://arxiv.org/abs/1505.01399