1. Heavy Flavor Physics Experiments in the LHC era
September 10-11, 2010
Flavor Physics and CP violation workshop
KIAS, Seoul, Korea
Heavy Flavor Physics Experiments in the LHC era
Kihyeon Cho
High Energy Physics Team
KISTI (Korea Institute of Science and Technology Information)

2. Contents HEP team @KISTI Heavy Flavor Physics? CDF vs. LHCb
Belle vs. Belle II
What is next?
Summary

3. High Energy Physics Team @ KISTI
High Energy Physics Team (Physicists)
Kihyeon Cho – P.I.
Soo-hyeon Nam - Senior Researcher
Junghyun Kim - Senior Researcher
YoungJin Kim - Postdoc
Taegil Bae - Postdoc
Jihye Moon - Researcher
Former members
Yongseok Oh – Prof. of KNU
Daejung Kong - Contract KNU
Ilsung Cho - Contract KyungHee U.
Minho Jeung - Company
Hyunwoo Kim - Computing KISTI

4. High Energy Physics Team @ KISTI
To probe the Standard Model and search for New Physics
e-Science
Theory
Comput-ing
Experi-ment
Wednesday, Landau shows similar diagram. According to Tony Hey, the 21st century is for data centric science called e-Science to unify theory, experiment and computing. We apply this concept to collider physics.
The goal is to probe SM and search for new physics. We focus on charm, bottom, top and Higgs.
CDF
Belle/Belle II
cf. LHCb
K.Cho and H.W.Kim, JKPS (2009)

5. High Energy Physics in the LHC era
Energy frontier experiments
LHC, ILC, …
LHC
ILC
Higgs, SUSY, Dark matter,
New understanding of space-time…
KEKB upgrade
CP asymmetry, Baryogenesis,
Left-right symmetry, New sources
of flavor mixing…
Super-B Factory,
K exp., etc.
New particles
and new interactions
Three approaches to
New Physics
n exp., m LFV, t LFV,
gm-2, …
Neutrino mixing/masses,
Lepton number non-conservation…
J-PARC
Lepton
physics
Quark flavor
physics
This shows three approaches to new physics in the next decade.
The first one is energy frontier experiments such as LHC to find new particles and new interactions.
The second one is lepton physics for neutrino mixing and masses.
The third one is quark flavor physics.
M. Yamakuchi, Belle II meeting (2008) 5

6. Heavy Flavor Physics Experiments
Belle/Belle II
CDF
LHCb
Year
(Belle)
2014 – (Belle II)
2001-
2009-
Place
KEK, Japan
Fermilab, USA
CERN, Europe
Collaboration
13/47/~300(Belle II)
(Nat./Ins./member)
15/63/620
15/54/730 σ
1 nb
(10GeV)
150 μb
(2TeV)
300~500 μb
(7~14TeV)
Current
Luminosity
1 ab-1
8 fb-1
180nb-1

7. Grossman, Ligeti, Nir (May 2009)
Not so near
future!!
Grossman, Ligeti, Nir (May 2009)

8. B Physics: Two golden cases
Bs-CPV
B → 2 leptons
especially:
And still many more…
From A. Buras

9. Hot topics Complimentary between B factories and LHCb
Belle/Belle II
CDF
LHCb
Bs CPV
Bs->J/psi phi
Bs->phi phi
Bs rare
Bs->mu mu
(by I. Yu)
B CPV
Sin phi_1
|Vub|
Taunic
Decays
B-> tau nu
(by Steve Olsen)
Radiative/EW
B-> Xs γ
Complimentary between B factories and LHCb
Belle/Belle II can do neutrals and cleaners.

10. LHC Era Phase 1: CERN vs. FNAL scenarios 2010-2011
Tevatron
LHC , currently foreseen schedule:
pp up to 7 TeV cm non stop with:
L=0.2fb-1 (2010) + 0.8fb-1 (2011)
LHC is starting up again since 2009
Presently L>3x1032 cm-2s-1 ,
2.5fb-1/year
Expecting to run until end 2011 => 12 fb-1 , i.e. 10fb-1data/experiment => x 2 present stat
Aurore

11. G. Borissov

12. Ongoing analysis @KISTI with Paris group
Analyzed 5.2 fb-1
Including new trigger (TTT) => adds 25% more data
New analysis => cross-check
Optimized data selection => getting more data than just from multiplying with the increase in luminosity.
Untagged analysis in progress with TTT and comparing with Dimuons
J/Ψ→μμ from
TTT sample
Bs→J/Ψφ from
TTT sample
6500 events from dimuon sample now
Youngjin Kim, K. Cho, Aurore, Nidal, etc.

13. => Daejung Kong, Satoru, etc.
G. Borissov
=> Daejung Kong, Satoru, etc.

14. G. Borissov

15. Heavy Flavor Physics by LHCb
√s = 7~14 TeV
LHCb: L=2-5 x 1032 cm-2 s-1
sbb = 300~500 mb
inel / s bb = 160
=> 1 “year” = 2 fb-1 (1012 bbar)
LHCb is a heavy flavour precision experiment searching for New Physics in CP Violation and Rare Decays.

16. A. Golutvin

17. A. Golutvin

18. A. Golutvin

19. Belle vs. Belle II Belle II To handle Belle II data Belle Belle
Content
Belle II
1998~2010
Time Schedule
2014~
1 ab-1
Luminosity
50 ab-1
1 Billion
BBbar events
50 Billion
CP measurement
Goal
New Physics
Belle II
To handle Belle II data
Belle

20. Belle II Data Handling Group (Chair: K.Cho)
KISTI Group
HEP Team
AMGA Team
GSDC Team
Melbourne Group
Tom Fifield, Martin Sevior, …
Krokow Group
Maciej Sitarz, Mitosz Zdybat,
Rafat Grzymkowski, Henryk Polka, …
KEK, Karlsruhe, etc…
J.H.Kim, S.I.Ahn, K.Cho et al, Comp. Phys. Comm. (2010)

21. Luminosity vs. Physics Major achievements Expected at Super B Factory
Belle
Start 2012 => 2014
Belle II

22. M. Nakao

23. M. Nakao

24. M. Nakao

25. M. Nakao

26. Penguin diagram t s b f s B0 s KS d d
time
M. Yamakuchi

27. If a new particle X exists…b f s B0 s KS d d
This measurement is sensitive to
new physics such as SUSY.
M. Yamakuchi

28. More penguin modes @ KISTI
B → Φπ
Pure EW penguin mode
SM Br ~O(10-8)
Babar with 232M BB:
UL(Φπ+) <
UL(Φπ0) <
Draft is almost ready.
B+ → ρ0K*+
Penguin dominant status
Work on progress
Junghyun Kim, K. Cho, Nakao, …

29. What is coming next?
At Belle, b → s gamma, leptonic decay provide test of SM and BSM constraints.
Belle data sample has not yet been analyzed yet.
Even more interesting results at Belle II with two order of magnitude.
At LHCb, new sensitivity regime at Bs → mu mu and Bs → J/psi phi with 100 pb-1 and new discovery with 1fb-1.
At CDF,

30. IN THE 1st PHASE OF THE LHC ERA;
YES CDF CAN &
MUST COMPETE
IN THE 1st PHASE OF THE LHC ERA;
Aurore

31. Summary
There are a few interesting results from the Heavy Flavor physics experiments indicating hints of something unknown…
CP Violation
Leptonic B decays
Penguin decays
NP or not-NP, we do not have clear understanding, yet.
Flavor physics in the LHC era

33. Thank you.

34. Why Heavy Flavor Physics?
The first flavor of new phenomena often comes from flavor physics
Weak decays of light hadrons => existence of charm quark
CP violation => 3rd quark family
B0 oscillation => heavy top quark
B mesons are especially suitable for beyond SM searches
Large mass of b quark – stronger coupling to new particles
Abundant production
Well developed technique of experimental selection
G. Borissov

35. The Unitary Triangles Graphical expression of unitary condition(s)
1 triangle has roughly equal-length sides
CKM unitary violation would imply New Physics.
Test SM + CKM by over-constraining angles and sides
This shows the unitary triangles.
CKM unitary violation would imply NP.