b d -> +

~1 m RICH1 RICH2 LHC-b Experiment RICH2 RICH1 Tree T Penguin P B d -> + B s -> D s K Rutherford Appleton Laboratory Unitarity Triangles VELO Particle Identification with 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 B d and B s mesons to test consistency of Unitarity Triangles. • It will follow on from Babar, BELLE that have already established CP violations for B d mesons (in the decay B d -> J/ K) and will constrain unitarity triangles to unprecedented accuracy. • LHC is the most intense source of B mesons (B d , B u , B s , B c ) with bb = 500 mb • Luminosity <L> LHCb = 2 x10 32 cm -2 s -1 10 12 bb / 10 7 s • Range of channels available in LHCb: Parameter Channels Evts/year (1 year) LHCb feature 2(+) B d 4900 |P/T| = 0 2-5 PID, hadron trigger B d ~1300 3-6 PID, hadron trigger 2+ B d D 340000 > 11 PID, hadron trigger B d J/K s 37000 0.6 -2 B s D s K 2400 6-14 PID, hadron trigger, t B d DK 400 10 PID, hadron trigger B s J/ 44000 0.6 t Bs oscillations x s B s D s 120000 up to 75 hadron trigger, t Rare Decays BR B s <210 -9 t B d K 22400 PID C 4 F 10 C 4 F 10 + CF 4 CF 4 Aerogel -K separation Number of silicon sensors: 100 Area of silicon: 0.32m 2 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 ~ 2 0 - 5 0 in 1 year – depends on |P/T| and strong phase • Backgrounds also have Expected physics results:

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 -K separation. CF 4. C 4 F 10. C 4 F 10 + CF 4. Aerogel. LHC is the most intense source of B mesons (B d , B u , B s , B c ) with s bb = 500 mb Luminosity < L> LHCb = 2 x10 32 cm -2 s -1 10 12 bb / 10 7 s Range of channels available in LHCb:. ~1 m. - PowerPoint PPT Presentation

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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