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Gluon mediated exclusive hadronic decays of b quarks are studied within thestandard model (SM) and the constrained minimally supersymmetric standard model(MSSM). For all allowed regions of the MSSM parameter space (A, tan beta, m_0,m_{1/2}) the penguin magnetic dipole form factor F^R_2 is dominant over theelectric dipole and can be larger than the magnetic dipole form factor of theSM. However, overall the SM electric dipole decay amplitude F^L_1 dominates thedecay rate. The MSSM penguin contributions to the free quark decay rateapproach the 10% level for those regions of parameter space close to thehighest allowed values of tan beta (~55) for which the gluino is light(m_{\tilde{g}} \approx 360 GeV) and lies within the range of the six d-squarkmasses. In these regions the supersymmetric box amplitudes are negligible. TheMSSM phases change very little over the allowed parameter space and can lead tosignificant interference with the SM amplitudes.Comment: 30 Pages plain latex; includes 8 eps figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Gluon and gluino penguin diagrams and the charmless decays of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>b</mml:mi></mml:math>quark

Gluon and gluino penguin diagrams and the charmless decays of thebquark