Yes, you don't need to pass a parameter.
For example, in the panel for your pie chart you would do a drilldown and a link
<chart>
<searchname> foo </searchname>
<drilldown>
<link target=_blank>/app/search/dashboardname</link>
</drilldwon>
</chart>
You can see more information about how you can link here in the simple xml reference -
http://docs.splunk.com/Documentation/Splunk/6.2.2/Viz/PanelreferenceforSimplifiedXML#link
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