A Study of some methods for measuring CKM CP violating phases

Nov, 1995
29 pages
Published in:
  • Z.Phys.C 74 (1997) 359-368
e-Print:
Report number:
  • OITS-593

Citations per year

1996200120062011201501234
Abstract:
We study the influence of penguin (especially, electroweak penguin) effects on some methods of measuring the angles α\alpha, β\beta, and γ\gamma in the CKM unitarity triangle. We use next-to-leading order effective Hamiltonian, and present numerical estimates based on the factorization approximation. We find that some techniques suggested in the literature, especially for α\alpha determination, are not workable in light of the electroweak penguin effects. Nevertheless, there are methods that would work for each angle determination. For angle β\beta we consider BD +D B \rightarrow D~{+} D~{-} mode and estimate the penguin contamination. For angle γ\gamma we consider a method based on SU(3) symmetry and carefully consider SU(3) breaking effects. We point out regions in the parameter space where this method could be used reliably.
  • CKM matrix: measurement
  • CP: violation
  • B: hadronic decay
  • hadronic decay: B
  • D: pair production
  • pair production: D
  • effective Hamiltonian
  • effect: penguin
  • electroweak interaction
  • factorization