hai...........its not a bata testing its spell missed ist 
beta testing.......
the diffrnec between the alpha testing and beta testing are
alpha testing is  nothing but an user acceptance testing 
done by the client at developement site..............beta 
testing is aslo a user acceptance testing done by the end-
users at client site.sanity testing is nothing but an 
system testing........here the testers test the basic 
functinalites of the application to know weather the 
application is applicable for  futher testing or 
not..........
if any thing wrong plz let me know

yeah there r two types of testing done before deploying the 
s/w that is they r user acceptance testing
- alpha testing
- beta testing
alpha testing is done at the devlpers site or in that 
company in the presence of the devloper and tester in a 
controlled environment
nd beta testing is done at users site or the customer end 
the sanitary testing is done to find the stability of the 
s/w i.e it is wide nd shallow testing it means that all the 
functionalities r checked but not in depth.....
QTP its a testing tool ..........

Alpha testing and beta testing are the types of user 
acceptance testing.

Alpha Testing:It is performed by client at devloper's 
site.It is prerelease testing.Normally alpha testing is 
performed at nearing the development completion.

Beta Testing:It is performed by client at their own site.It 
is performed to verify product meets the user requirements 
and to take important decision about release of software.

Sanity testing:It is cursive testing.It is subset of 
regression testing.Sanity testing is narrow and deep.e.g 
After receiving new build with minor changes sanity testing 
is performed to ensure fixes are indeed fixed and no other 
defects are introduced as a result of changes.After 
performing several cycles of regression testing sanity 
testing can be performed at later cycle.