Light Higgsino from Dilemma in Rare -decays
Nov 30, 2015
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Abstract: (arXiv)
In the Minimal Supersymmetric Standard Model (MSSM), large chiral symmetry breaking term , which plays an important role in Higgs mass, may significantly contribute in flavor changing neutral current (FCNC) processes and . Though the above processes can both be categorized as transitions, the two rare decays behave completely different in MSSM. With an on-shell photon in the final state, helicity of initial state -quark and final state -quark must be flipped in , which corresponds to the simultaneous breaking of chiral symmetry and electroweak symmetry. The common feature is shared by fermion mass generation. Same as radiative mass generation in MSSM, Peccei-Quinn and symmetry breaking contributions, for example from a Higgsino-stop loop when , may significantly cancel the contribution from charged Higgs and reduce the prediction of . For the latter process, including Babu-Kolda FCNC proportional to , is mediated by a scalar boson which corresponds to chiral symmetry breaking. In addition, as a result of interference among the Higgs extension sector and contributions, in the region of which is favored by , there may simultaneously exist large enhancement in . However, we still find viable parameter region with light Higgsino of a few hundreds GeV when charged Higgs contribution is not negligible with of 400 GeV.Note:
- 15 pages, 6 figures
- new physics
- supersymmetry
- minimal supersymmetric standard model: parameter space
- stop: mixing
- stop: coupling
- coupling: Higgs
- Higgsino: mass
- Higgsino: exchange
- B: rare decay
- B: radiative decay
References(37)
Figures(10)
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