In this thesis, using a general model independent form of the effective
Hamiltonian, the CP-violating asymmetries in the b -> / d l l transition,
when one of the leptons is polarized, is investigated. The sensitivity
of the CP-violating asymmetries on the new Wilson coefficients are
analyzed.
Next, in the frame work of the same formalism, the polarized lepton
pair forward& / #8211 / backward asymmetries in B-> / K l l decay are studied.
We present the general expression for the nine double& / #8211 / polarization
forward& / #8211 / backward asymmetries. It is obtained that, the zero point position
of the forward& / #8211 / backward asymmetries of the doubly& / #8211 / polarized
lepton pair does not depend on long distance effects but depends on
short distance dynamics. Furthermore, it is shown that the zero position
of AFB is very sensitive to the sign of the new Wilson coefficients.
When sign of the Wilson coefficients is positive (negative) the zero position of the forward& / #8211 / backward asymmetries shifts to the left(right)
compared to the SM.
Moreover, the dependencies of the nine double& / #8211 / polarization forward& / #8211 / backward asymmetries on new Wilson coefficients, and the correlation
of the averaged nine double& / #8211 / polarization forward& / #8211 / backward asymmetries
with branching ratio, have been studied. It is observed that, the
study of the nine double& / #8211 / polarization forward& / #8211 / backward asymmetries
can serve as a good test in establishing new physics beyond the Standard
Model.
Finally, we observed that there are exist such regions of new Wilson
coefficients for which the nine double& / #8211 / polarization forward& / #8211 / backward
asymmetries considerably depart from the SM result, while the branching
ratio coincides with that of the SM prediction. In other words,
new physics effects can be established by analyzing polarized forwardbackward
asymmetry in this region of the new Wilson coefficients.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12606180/index.pdf |
| Date | 01 June 2005 |
| Creators | Bashiry, Vali |
| Contributors | Aliyev, Tahmasib |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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