Analysis of Single Top Polarization using Parton Level Atlas samples

1. Abstract

2. Parton Level Samples

3. Optimal basis/ Spectator basis

For the Optimal basis (s-channel) you have to take the incoming antiquark and the antilepton in the CM-frame of the top quark.
The Optimal Basis in the s-channel corresponds to the Spectator basis in the t-channel.
For the Spectator basis in the t-channel use spectator quark and the antilepton in the CM frame of the top quark.

4. Degree of Polarization

The degree of polarization is defined as D=(N--N+)/(N-+N+) where N- is the number of events with a negative polarized top and N+ is the number of events with a positive polarized top.

There are two ways to get the N- and the N+ from the histogram:

degreepolarization.jpg

The first method means you just take the number of events at the left and right corner of the histogram (cos(&sigma)=-1 and cos(&sigma)=1 respectively).

5. ONETOP-samples

-- SarahHeim - 10 Mar 2008
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Topic revision: r19 - 21 Mar 2008, SarahHeim
 

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