 beam-remnant partons.
  

<p/>
A net <i>kT</i> imbalance is obtained from the vector sum of the
primordial <i>kT</i> values of all initiators and all beam remnants.
This quantity is compensated by a shift shared equally between 
all partons, except that the dampening factor <i>m / (m_half + m)</i> 
is again used to suppress the role of small-mass systems. 

<p/>
Note that the current <i>sigma</i> definition implies that
<i>&lt;pT^2&gt; = &lt;p_x^2&gt;+ &lt;p_y^2&gt; = 2 sigma^2</i>. 
It thus cannot be comp