-- ChristianFlacco - 20-Oct-2010

Boosted W Tagger Development

People presently involved: Michael Wilson (SLAC), Christian Flacco (UCI)

Project purpose

Design and validate a W-tagger for efficient identification of boosted weakly-decaying heavy objects. The tagger would be used in concert with other selection tools to discriminate against various conaminating final-state contributions.

Motivations

There are several imminent uses for such a tool. Here, motivation is given by example--please submit additions to the list.

Example: all-had ttbar source. FS is all jets, no significant ME. Difficult to isolate becuse signature is shared by dominant qcd processes. Distinguishing characteristics are presence of bjets, multiplcity, jets from Ws. Tagger would exploit last attribute.

Example: New phenomena may produce high-momentum W in intermediate state. Efficient identification of high-momentum W will facilitate understanding of parent objects by reducing combinatorics and improving resolution of reconstructed mass.

In contrast to top-tagging, W tagging provides a way to search for phenomena where W parentage is not top, such as fourth generation b', t'.

Methods

The initial goal is to explore jet structure variables that have been presented in the literature, and optimize them to application on Atlas data. The approach will be data-driven. We anticipate direct use of calorimeter clusters, thus a requirment to use the Event Summary Data (ESD) format.

References

(link Harvard paper)

(link papers by Plehn, Spannowsky, Butterworth)

Links to related topics

* Boost2010 (note Higgs papers, 2 at top, also top)

* Inforamtion page on ttbar-->all-hadronic analysis (created by Ignacio Aracena, SLAC