## Saturday, November 13, 2010

### Shrinking Space

I never noticed the appearance of this new D0 paper on MSSM bounds, until Marco said that it made Lubos sad. Apparently D0 have just excluded a large favoured chunk of parameter space for the $\tan \beta$ parameter, which involves multiple fairy fields in the MSSM. Cheer up, Lubos, there is still a little white space left. Then again, there comes a point when one should probably cut one's losses ...

Actually, if there were fairy fields they would probably satisfy the popular stringy value of $\tan \beta = 36$, since this is the ratio of Koide scales that we obtain for the top and bottom quarks.