How to boost a querystring at query time

[Romi]

i want to enable boosting for query and search results. My dismax
queryHandlerConfiguration is as:

*<requestHandler name="dismax" class="solr.DisMaxRequestHandler"   >
    <lst name="defaults">
     <str name="echoParams">explicit</str>
      <str name="defType">dismax</str> 
     <float name="tie">0.01</float>
     <str name="qf">
        text^0.5 name^1.0 description^1.5 
     </str>
    <str name="fl">
        UID_PK,name,price,description,score
     </str>
     <str name="mm">
        2&lt;-1 5&lt;-2 6&lt;90%
     </str>
     <int name="ps">100</int>
     <str name="q.alt">*:*</str>
     <str name="f.name.hl.fragsize">0</str>
    <str name="f.name.hl.alternateField">name</str>
     <str name="f.text.hl.fragmenter">regex</str>
    </lst>
  </requestHandler>*


When querystring is q=gold^2.0 ring(boost gold) and qt=standard i got the
results for gold ring and when qt=dismax i got no result why so please
explain




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Thanks & Regards
Romi
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