000003594 001__ 3594
000003594 005__ 20230523062911.0
000003594 037__ $$aBELLE2-MTHESIS-2023-013
000003594 041__ $$aeng
000003594 100__ $$aMehraj Chhetri
000003594 245__ $$aCP violation in B decays at Belle II
000003594 260__ $$aChennai$$bIndian Institute of Technology Madras$$c2023
000003594 300__ $$a92
000003594 500__ $$aPresented on 15 05 2023
000003594 502__ $$aMSc$$bChennai, Indian Institute of Technology Madras$$c2023
000003594 520__ $$aThe $CP$ violation in the standard model can be observed through the decay of $B$ meson and a parameter which gives a measure of $CP$ violation is the angle $\phi_3$ of the unitarity triangle. Precisely measuring $\phi_3$ is an essential test for the standard model, and such measurements can be made using tree-level decays that are unaffected by new physics. The optimal approach for obtaining highly precise measurements of $\phi_3$ involves the use of the $B\rightarrow DK$ decay channel, which currently offers the most sensitive method for performing these measurements. This dissertation explores the possibility of measurement of angle $\phi_3$ using model-independent Dalitz plot analysis of $B^{\pm} \rightarrow D\:(K_L^0\:\pi^+\pi^-)\:K^{\pm}$ where $D$ can either be $D^0$ or $\Bar{D}^0$. The decay channel is reconstructed using kinematic constraint. The signal is then extracted by employing a fast-boosted decision tree technique to suppress the continuum background. However, the present study concludes that the precision measurement of $\phi_3$ cannot be achieved using this mode due to the weak signal strength, which imposes limitations on the statistical accuracy. The analysis is performed on a simulated data sample generated at the $\Upsilon(4S)$ center of mass energy of $e^- e^+$ collision at Bele II, with an integrated luminosity corresponding to $200\:\mathrm{fb}^{-1}$. 
000003594 700__ $$aDr Jim Libby$$edir.
000003594 8560_ $$fph21c026@smail.iitm.ac.in
000003594 8564_ $$uhttps://docs.belle2.org/record/3594/files/BELLE2-MTHESIS-2023-013.pdf
000003594 980__ $$aTHESIS