1. B Physics at In relation to SUSY ? 4th Workshop on Mass Origins
Fumihiko UKEGAWA
CDF Collaboration
(University of Tsukuba, Japan)
4th Workshop on Mass Origins
and Supersymmetry Physics
March 6 – 8, 2006
Epochal Tsukuba, Tsukuba, Japan

2. B physics at a hadron collider ?

3. CDF di-muon triggers
Near J/y
Wide mass range
~15% from B decays

6. Bound state of two different heavy quarksc p u d
J/y Bc

7. Run-II Silicon Vertex Trigger : SVT
Use silicon information at the 2nd level of trigger
Find a track in the
main tracker COT.
Extrapolate toward
the SVX.
Find SVX hits
along the road.
Calculate impact
parameter wrt the
primary vertex
(beam spot).
Resolution ~50 mm
for > 2 GeV/c.
Typical trigger requirement :
two tracks above 2 GeV/c,
| d | > 120 mm,
Lxy > 500 mm.

8. B signals from CDF SVT triggers : full reconstruction
4800
4900
Understand proper time resolution and flavor tagging

9. B physics : does the unitarity triangle close?

10. Kobayashi-Maskawa picture holds good,
2019/4/21
2005
Kobayashi-Maskawa picture holds good,
but we are looking for possible discrepancies!
ckmfitter.in2p3.fr

11. New physics effects on the unitarity triangle ?
Now seems unlikely, or looking for a very small discrepancy.
Need more precision, but now hit the wall?
Still largely untested.
BS oscillations crucial.
Precise angle g ?

12. New physics in b  s transition ?
Belle : PRL 91, (2003)

13. CDF can provide unique tests of b  s (SUSY?)

14. FCNC Vtd for B0d, Vts for B0s Helicity suppressed. B.F. very small.
d, s t w l+ l-
Z/g
FCNC
Vtd for B0d, Vts for B0s
Helicity suppressed.
B.F. very small.
SM predictions for B.F.

15. B.R. < 5.1 x 10-8 for B0d B.R. < 2.0 x 10-7 for B0s @ 95% C.L.
No candidate
in the B0d or B0s mass windows.
B.R. < 5.1 x 10-8 for B0d
B.R. < 2.0 x for B0s
@ 95% C.L.
PRL 95, (2005)
CDF Run-I limits :
B.R. < 8.6 x 10-7 for B0d
B.R. < 2.6 x 10-6 for B0s
PRD 57, 3811 (1998)

16. Future : look for CP-violation, ~0 expected in SM, arg(Vts).
260 pb-1
Future : look for CP-violation, ~0 expected in SM, arg(Vts).

17. 1.1 k total
17 k

19. Pion mass assigned to h+ h- Use dE/dx and mass
2019/4/21
Total
891±47
Signal 891 +/- 47
Pion mass assigned to h+ h-
Use dE/dx and mass
distributions to determine composition

20. Soon +/- 0.04
Angle g in a longer term (after Dms)

21. Near future : polarizations

22. Summary CDF Run-II has a rich B Physics program
Enhanced capabilities :
CDF has added silicon-based trigger, enabling to collect all-hadronic final states such as B  D p, Bs  K+K- .
Lepton triggers remain valuable, J/y K and l n D.
Expect to collect 2.5 fb-1 by end of 2006, and 9 fb-1 by 2009,
and to make some significant measurements.