Heavy Flavor Physics in the LHC era

조기현 , 남수현 , 김정현 , 김영진 , 배태길 고에너지물리연구팀

KISTI (Korea Institute of Science and Technology Information)

April 13-15, 2011The Korean Physical Society MeetingDaejeon, Korea

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Kihyeon Cho

Abstract

Since LHC turns on and Belle II is approved, there have been rich for hot topics on heavy flavor physics experiments.

In this paper, we will compare theories and experiments (Belle/Belle II, CDF and LHCb) on heavy flavor physics.

We also show the activities at KISTI.

In addition, we consider the meaning of heavy flavor physics during LHC era.

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Kihyeon Cho

Heavy Flavor Experiments (2011.04)

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Belle/Belle II(KISTI 참여 )

CDF(KISTI 참여 )

LHCb( 참고 )

Year 1998-2010 (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)

CurrentLuminosity

1 ab-1 9 fb-1 10 pb-1

Kihyeon Cho 4

B physics selections

Ref. LHCb-CONF-2001-001 (2011.3.24)

Kihyeon Cho5

Not so near future!!

Grossman, Ligeti, Nir (May 2009)

Kihyeon Cho

Heavy Flavor Physics at KISTI

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Experiment Theory

Rare B0 decays Belle( 김정현 등 )

Left-Right models( 남수현 등 )

Mixing and CPV on Bs->J/psi phi

CDF( 김영진 ,조기현 , 배태길 등 )

Left-Right models( 남수현 등 )

Top Forward-backward Asymmetry

CDF Model independent Analysis ( 남수현 등 )

CP violating dimuon charge asymmetrydue to B mixing

D0 Left-Right models ( 남수현 등 )

Kihyeon Cho

Rare B modes @ Belle

B → ΦπPure EW penguin modeSM Br ~O(10-8)Babar with 232M BB:

UL(Φπ+) < 2.4*10-7 @90%CL

UL(Φπ0) < 2.8*10-7 @90%CL

Draft is almost ready.

B+ → ρ0K*+

Penguin dominant statusWork on progress

7Junghyun Kim, K. Cho, Nakao, …

Kihyeon Cho 8

BB Mixing @ Left-Right models

Currently work in progress

Dr. Soo-hyeon Nam

Kihyeon Cho9

CP violation on Bs-> J/psi @CDF Analyzed 5.2 fb-1

Including new trigger (TTT) => adds 25% more data New analysis => cross-checkOptimized data selection => 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

=> Dr. YoungJin Kim’s presentation

Kihyeon Cho 10

We used dimension-6 four quark operators with all the possible Dirac and color structures.

We considered the s-, t- and u- channel exchanges of spin-0 and spin-1 particles whose color quantum number is either singlet, octet, triplet or sextet.

Our results encode the necessary conditions for the underlying new physics in a compact and an effective way when those new particles are too heavy to be produced at the Tevatron.

FB asymmetry @ Tevatron

Model independent analysis

S.-h Nam. et.al, PLB 691, 238 (2010)

The region in (C1,C2) plane that is consistent with the Tevatron data at the one sigma level.

tt

Kihyeon Cho

Flavor physics in the LHC era

LHC (High PT)

A unique effort toward the high-energy frontier to determine the energy scale of NP.

Flavor physics A Collective effort

toward the high-intensity frontier to determine the flavor structure of NP.

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Kihyeon Cho

There are a few interesting results from the heavy flavor physics experiments indicating hints of something unknown…

Penguin decaysCP Violation and mixingTop forward-backward asymmetry

NP or not-NP, we do not have clear understanding, yet.

Therefore we, HEP team at KISTI, continue working on heavy flavor physics for both theory and experiment in the LHC era.

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Summary

Thank you.

cho@kisti.re.kr

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