We investigate constraints from the observed branching ratio for b→sγ and fine-tuning in the framework of natural supersymmetry. The natural supersymmetry requires the large trilinear coupling of the stop sector, light higgsinos (a small μ parameter) and light stops, in order to reduce the fine-tuning in the Higgs sector while avoiding the LEP constraint. It is found that in such a scenario 5% (10%) level of fine-tuning is inevitable due to the b→sγ constraint even if the messenger scale is as low as 10 5GeV(10 4GeV), provided that the gaugino masses satisfy the GUT relation.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Mar 29 2012|
Bibliographical noteFunding Information:
We thank Kazuhiro Tobe for useful discussion. N.Y. would like to thank Caltech Particle Theory group where this work has been carried out. This work is supported by Grant-in-Aid for Scientific research from the Ministry of Education, Science, Sports, and Culture (MEXT) , Japan, No. 22-7585 (N.Y.). This work was also supported in part by the U.S. Department of Energy under contract No. DE-FG02-92ER40701 , and by the Gordon and Betty Moore Foundation (K.I.).