Bd -> ?? ?

1
Bd -gt ?? ?
LHC-b Experiment
RICH2
RICH1
Physics aims
Rutherford Appleton Laboratory

• LHCb is a 2nd generation experiment that will
  determine CP violations in a variety of decays of
  Bd and Bs mesons to test consistency of Unitarity
  Triangles.
• It will follow on from Babar, BELLE that have
  already established CP violations for Bd mesons
  (in the decay Bd -gt J/Y K) and will constrain
  unitarity triangles to unprecedented accuracy.

Vertex Locator (VELO)

• UK Contributions to LHCb vital for LHCb physics
• RICH detectors
• Vertex Locator (VELO)

Unitarity Triangles
Particle Identificationwith RICH detectors
Number of silicon sensors 100 Area of silicon
0.32m2Number of channels
204,800
VELO
Expected physics results
Tree T
Penguin P
Parameter Channels Evts/year ?(1
year) LHCb feature 2(??) Bd??? 4900 ?P/T
0 2?-5? PID, hadron trigger Bd?r?
1300 3?-6? PID, hadron trigger 2?? Bd ?
D? 340000 gt 11? PID, hadron trigger ? Bd?J/?Ks
37000 0.6? ?-2?? Bs
?DsK 2400 6?-14? PID, hadron trigger, ?t ? Bd ?
DK 400 10? PID, hadron trigger ?? Bs ?
J/yf 44000 0.6? ?t Bs oscillations xs Bs ?
Ds? 120000 up to 75 hadron trigger, ?t Rare
Decays BR Bs ? ?? lt2?10-9 ?t Bd ? K
mm 22400 PID
RICH2
RICH1
Bs -gt Ds?K?