Ishiwata, Koji and Nagata, Natsumi and Yokozaki, Norimi (2012) Natural Supersymmetry and b → sγ constraints. Physics Letters B, 710 (1). pp. 145-148. ISSN 0370-2693 http://resolver.caltech.edu/CaltechAUTHORS:20120608-113439037
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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 finetuning 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 10^5 GeV (10^4 GeV), provided that the gaugino masses satisfy the GUT relation.
|Additional Information:||© 2012 Elsevier B.V. Received 13 December 2011. Revised 31 January 2012. Accepted 16 February 2012. Available online 22 February 2012. Editor: T. Yanagida. 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.).|
|Official Citation:||Koji Ishiwata, Natsumi Nagata, Norimi Yokozaki, Natural supersymmetry and constraints, Physics Letters B, Volume 710, Issue 1, 29 March 2012, Pages 145-148, ISSN 0370-2693, 10.1016/j.physletb.2012.02.052.|
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|Deposited By:||Tony Diaz|
|Deposited On:||20 Jun 2012 21:45|
|Last Modified:||08 Mar 2013 21:36|
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