CP-violating effects in b decays beyond the standard model

Download

index.pdf

Date

2005

Author

Bashiry, Valı

Metadata

Show full item record

Item Usage Stats

141
views

73
downloads

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 forwardاbackward asymmetries in B->K l l decay are studied. We present the general expression for the nine doubleاpolarization forwardاbackward asymmetries. It is obtained that, the zero point position of the forwardاbackward asymmetries of the doublyاpolarized 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 forwardاbackward asymmetries shifts to the left(right) compared to the SM. Moreover, the dependencies of the nine doubleاpolarization forwardا backward asymmetries on new Wilson coefficients, and the correlation of the averaged nine doubleاpolarization forwardاbackward asymmetries with branching ratio, have been studied. It is observed that, the study of the nine doubleاpolarization forwardاbackward 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 doubleاpolarization forwardاbackward 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.

Subject Keywords

Sound.

URI

http://etd.lib.metu.edu.tr/upload/12606180/index.pdf
https://hdl.handle.net/11511/15169

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Disinflation and exchange-rate pass-through Senay, Ozge (Cambridge University Press (CUP), 2008-04-01) This paper analyzes exchange-rate dynamics following a money-based disinflation under different degrees of exchange-rate pass-through. Using a microfounded dynamic general equilibrium model with imperfect competition and nominal rigidities, it is shown that a monetary slowdown causes an appreciation of the exchange rate and a short-run fall in employment. Varying the degree of pass-through, however, significantly alters the magnitudes of these effects. As the degree of pass-through is reduced, the extent of...
Polarized lepton pair forward-backward asymmetries in B -> K*l(+)l(-) decay beyond the standard model Alıyev, Tahmasıb; Savcı, Mustafa (Springer Science and Business Media LLC, 2004-05-01) We study the polarized lepton pair forward-backward asymmetries in B --> K*l+l(-) decay using a general, model independent form of the effective hamiltonian. We present the general expression for nine double-polarization forward-backward asymmetries. It is shown that, the study of the forward-backward asymmetries of the doubly-polarized lepton pair is a very useful tool for establishing new physics beyond the standard model.
Computer simulation of grain boundary grooving and cathode voiding n bamboo interconnects by surface diffusion under capillary and electromigration forces Akyıldız, Öncü; Oğurtanı, Tarık Ö.; Department of Metallurgical and Materials Engineering (2004) The processes of grain boundary grooving and cathode voiding which are important in determining the life times of thin films connecting the transistors in an integrated circuit are investigated by introducing a new mathematical model, which flows from the fundamental postulates of irreversible thermodynamics, accounting for the effects of applied electric field and thermal stresses. The extensive computer studies on the triple junction displacement dynamics shows that it obeys the first order reaction kinet...
Double-lepton polarizations in B -> l(+)l(-)gamma decay Alıyev, Tahmasıb; Savcı, Mustafa (American Physical Society (APS), 2005-02-01) Double-lepton polarization asymmetries in the B-->l(+)l(-)gamma decay are calculated using the most general, model independent form of the effective Hamiltonian including all possible forms of the interaction. The dependencies of the asymmetries on new Wilson coefficients are investigated. The detectability of the averaged double-lepton polarization asymmetries at LHC is also discussed.
Quantum aspects of the noncommutative Sine-Gordon model Kürkcüoğlu, Seçkin (Springer Science and Business Media LLC, 2007-09-01) In this paper, we first use semi-classical methods to study quantum field theoretical aspects of the integrable noncommutative sine-Gordon model proposed in [hep-th/0406065]. In particular, we examine the fluctuations at quadratic order around the static kink solution using the background field method. We derive equations of motion for the fluctuations and argue that at O(θ2) the spectrum of fluctuations remains essentially the same as that of the corresponding commutative theory. We compute the one-loop tw...

Citation Formats

V. Bashiry, “CP-violating effects in b decays beyond the standard model,” Ph.D. - Doctoral Program, Middle East Technical University, 2005.