if(Mage::registry('current_category')) // current category
{
    if(! Mage::registry('current_product')) // not product page
    {
        //Your Analytics script Here
    }
}

<catalog_category_default>
    <reference name="head">
        <block type="core/text" name="your_external_file">
            <action method="setText"><text><![CDATA[<script>function utmx_section(){}function utmx(){}(function(){var k='xxxxxxxxxxx-1',d=document,l=d.location,c=d.cookie; ... valueOf()+(h?'&utmxhash='+escape(h.substr(1)):'')+ '" type="text/javascript" charset="utf-8"></sc'+'ript>')})(); </script><script>utmx('url','A/B');</script>]]></text></action>
        </block>
    </reference>
</catalog_category_default>

<catalog_category_layered>
    <reference name="head">
        <block type="core/text" name="your_external_file">
            <action method="setText"><text><![CDATA[<script>function utmx_section(){}function utmx(){}(function(){var k='xxxxxxxxxxx-1',d=document,l=d.location,c=d.cookie; ... valueOf()+(h?'&utmxhash='+escape(h.substr(1)):'')+ '" type="text/javascript" charset="utf-8"></sc'+'ript>')})(); </script><script>utmx('url','A/B');</script>]]></text></action>
        </block>
    </reference>
</catalog_category_layered>

<catalog_product_view>
    <reference name="head">
        <block type="core/text" name="your_external_file">
            <action method="setText"><text><![CDATA[<script>function utmx_section(){}function utmx(){}(function(){var k='xxxxxxxxxxx-1',d=document,l=d.location,c=d.cookie; ... valueOf()+(h?'&utmxhash='+escape(h.substr(1)):'')+ '" type="text/javascript" charset="utf-8"></sc'+'ript>')})(); </script><script>utmx('url','A/B');</script>]]></text></action>
        </block>
    </reference>
</catalog_product_view>

<reference name="head">
    <block type="core/text" name="your_external_file">
        <action method="setText"><text><![CDATA[<script>function utmx_section(){}function utmx(){}(function(){var k='xxxxxxxxxxx-1',d=document,l=d.location,c=d.cookie; ... valueOf()+(h?'&utmxhash='+escape(h.substr(1)):'')+ '" type="text/javascript" charset="utf-8"></sc'+'ript>')})(); </script><script>utmx('url','A/B');</script>]]></text></action>
    </block>
</reference>