Search for Massive Resonances Decaying to ZZ in the Final State eeee

Search for Massive Resonances decaying to ZZ in the final state eeee.

This analysis searches for a massive object decaying to a pair of Z bosons, which both decay to ee. The cross section times branching fraction for RS Gravitons which decay to \zzero bosons is 292 fb, which leads to an expectation of 0.66 \gtozzeeee events produced in 2~\ifb of data. In order to be maximally sensitive to any signal we might record, we have developed a very efficient electron selection. The improvement in acceptance times efficiency of this selection compared to standard CDF electron selection is a factor of two for Standard Model \zzero events, and a factor of four for \gtozzeeee events. Using a novel data-based background estimation technique, we estimate the background in our signal region to be $0.02 \pm 0.02$ events in 1.1~\ifb of data.

Contacts: Ben Brau, Antonio Boveia and David Stuart
Data: Run II, 1.1 fb^-1
Documentation: PDF

Plots and Tables:

Twelve ZZ Candidate events in data. Chi^2 versus m_{eeee} is plotted, with the search region outlined in red. One event is in the upper overflow bin, because it has a Chi^2 value of > 1000.
	EPS or GIF.
The twelve ZZ Candidates in data, with Monte Carlo expectations overlaid, just for comparison. Backgrounds at high mass were estimated with Data.
	EPS or GIF.
Background prediction using samples with one or more electron candidates replaced with a hadronic fake:
	1 EPS or 1 GIF.	2 EPS or 2 GIF.
	3 EPS or 3 GIF.	4 EPS or 4 GIF.
Cross-Section Limit for Randall-Sundrum Graviton, with theoretical prediction in blue.
	EPS or GIF,
Event display of lowest chi^2 event
	EPS or GIF,

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