B d -> +
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~1 m
RICH1 RICH2
LHC-b Experiment RICH2 RICH1
Tree T Penguin P
Bd -> +
Bs -> DsK
Rutherford Appleton Laboratory
Unitarity Triangles
VELO
Particle Identificationwith RICH detectors
• Rate asymmetries measure angle
• Expect 2400 events in 1 year of data taking
• 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 -> J/ K) and will constrain unitarity triangles to unprecedented accuracy.
• LHC is the most intense source of B mesons (Bd, Bu, Bs, Bc) with bb = 500 mb
• Luminosity <L>LHCb = 2 x1032 cm-2 s-1 1012 bb / 107 s
• Range of channels available in LHCb:
Parameter Channels Evts/year (1 year) LHCb feature
2(+) Bd 4900
|P/T| = 0 2-5 PID, hadron trigger
Bd ~1300 3-6 PID, hadron trigger
2+ Bd D 340000 > 11 PID, hadron trigger
BdJ/Ks 37000 0.6
-2 Bs DsK2400 6-14 PID, hadron trigger, t
Bd DK 400 10 PID, hadron trigger
Bs J/ 44000 0.6 t
Bs oscillations
xs Bs Ds120000 up to 75 hadron trigger, t
Rare Decays
BR Bs <210-9 t
Bd K 22400 PID
C4F10
C4F10
+CF4
CF4
Aerogel
-K separation
Number of silicon sensors: 100 Area of silicon: 0.32m2
Number of channels: 204,800
Number of silicon sensors: 100 Area of silicon: 0.32m2
Number of channels: 204,800
Vertex Locator (VELO)
UK Contributions to LHCb vital for LHCb physics:• RICH detectors• Vertex Locator (VELO)
Physics aims:
• sensitive to CKM angle
~ 20 - 50 in 1 year
–depends on |P/T| and strong phase
• Backgrounds also have
Expected physics results: