FLAV_02
Flavour physics : joint efforts towards
searching for physics beyond the SM
Koji Hara (KEK)
For
Flav_02 France-Japan collaboration
B physics collaboration within TYL
I) 2006-2009: A. Stocchi-M. Hazumi (SuperB-Belle II-Theory)
Italian-SuperB and Belle II common physics case study
II) 2009-2012 E. Kou-S. Hashimoto (SuperB-Belle II-Theory)
Theoretical issues and analysis problems for super B factories
III) 2013-2016 M.-H. Schune-K. Hara (LHCb-Belle II-Theory)
Combined study of LHCb and Belle II new physics constraints
2016 members
French Group
Name
Title
Dr.
Lab./Organis.
LAL/IN2P3
Yasmine Amhis
Benoit Blossier
Dr.
Dr.
LAL/IN2P3
LPT/INP
Jeremy Hebinger
PhD
LAL/IN2P3
Emi Kou
Francois Le Diberder
Vitalii Lisovsky
Andrea Mogini
Bachir Moussallam
Francesco Polci
Roman Poeschl
Guy Wormser
Dr.
Prof.
PhD
LAL/IN2P3
LAL/IN2P3
LAL/IN2P3
LPNHE/IN2P3
Marie-Helene
Schune
PhD
Dr.
Dr.
Dr.
Dr.
IPNO/IN2P3
LPNHE/IN2P3
LAL/IN2P3
LAL/IN2P3
Japanese Group
Name
Theorists
Koji Hara
Title
Lab/Organis.
Assist. Prof. KEK
Shoji Hashimoto
Takeo Higuchi
Akimasa Ishikawa
Ryosuke Itoh
Satoshi Mishima
Karim Trabelsi
Kiyoshi Hayasaka
Junji Hisano
Toru Iijima
Mihoko Nojiri
Yutaro Sato
Prof.
Assoc.Prof.
Assis. Prof.
Prof.
Assoc.Prof.
Assoc.Prof.
Assoc.Prof.
Prof.
Prof.
Prof.
Dr.
KEK
IPMU, Tokyo U.
Tohoku U.
KEK
KEK
KEK
Niigata U.
KMI, Nagoya U.
KMI, Nagoya U.
KEK
KEK
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Our project
i) LHCb-Belle II-theory common discussion towards a global
fit of new physics parameters
✓Experimental analysis technique (LHCb-Belle II)
✓Theory uncertainties (Lattice QCD, hadron physics...)
✓New physics models
✓Statistical method for global fit
ii) Contributions to the theory-experiment physics working group
towards Belle II set-up (B2TiP)
✓Contribution to the New physics working group
✴Defining benchmark model/point
✴Model dependent/independent global fit
✴Interplay between different experiments (LHCb, high pT...)
✓Contribution to organization
✴Organization (E.Kou)
✴Report editor (E. Kou, S. Mishima)
✴Advisory (S. Hashimoto, F. Le Diberder)
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Scientific results
Two common interests are identified
✴The photon polarization measurement of bs gamma via semileptonic B->K*e+e- (M.-H. Shune, F. Polci, M. Borsato, E. Kou, F. Le
Diberder, A. Ishikawa, R. Itoh, S. Mishima)
✴The branching ratio of B->D(*)tau nu and its angular distribution (G.
Wormser, B. Blossier, K. Hara, Y. Sato)
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Scientific results
Work on BK*ll
Martino Borsato, Samuel Coquereau, Francesco Polci and MHS
Photon polarization
with l = μ : full angular analysis on Run1 data (3fb-1) arXiv:1512.0442, accepted by JHEP
with l = e , at low q2 on Run1 data JHEP 04 (2105) 064
LHCb result 2015
LHCb simulation shows a difficulty of
the photon conversion
for BK*γK*ee
(M.-H. Schune, M. Borsato)
HOW ABOUT Belle II ?
M(ee) large : complete loss of
sensitivity
✴M.H. Schune is invited to talk at B2TiP workshop (Pittsburgh in May 2016).
✴We have nominated M. Borsato for the TYL prize!
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Scientific results
Photon polarization
2016: Implementation to Belle II simulation?
A. Ishikawa, E. Kou, F. Le Diberder
Full angular analysis of B->Kππγ
LHCb plan 2016
LFV
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Scientific results
B D(*) tau nu (R(D*))
New Measurement of BD*tau nu with Semileptonic Tagging Method
Y. Sato, T. Iijima
NN>0.8
• Consistent with previous
measurements
• R(D*) higher than SM
prediction
Belle preliminary 2016
R( D
*
B
( B  D * )
)
B ( B  D *  )
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Scientific results
Current R(D*)-R(D) situation
B D(*) tau nu (R(D*)) on-going studies
Study of Characteristic of Decay
 Distinguish SM and NP Models
Y. Sato, S. Hirose,T. Iijima, K. Hara
Semilep. Tag Data
SM (histo.)
p=37.6%
Semilep. Tag Data
Lepto-quark (histo.)
p=1.4%
* Decay Kinematics
Data vs Models
* Polarization of tau, D*
 SM or Which NP
3 s level deviation  NP?
“Inverted Vertex” method at LHCb
Guy Wormser
Reconstruct tau
trajectory
>5s
• Tau trajectory reconstructed
• Background suppressed by
• BD*3p  tau vertex
• BD*D(s)  extra particle,
partial reconstruction of D(s)
• Expect <5 % Precision of R(D*)
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• Method applicable to LbLc
B2TiP - Belle II Theory interplay Platform Find details on the B2TiP website https://belle2.cc.kek.jp/~twiki/bin/view/Public/B2TIP
Contributions to the B2TiP
✴Public code for B physics (R. Itoh, E. Kou, S. Mishima, M. Nojiri and Y. Sato)
✴Photon conversion study (M. Borsato and M.-H. Schune)
✴CKM Impact plot proposition (E. Kou and F. Le Diberder)
✴New observable for tau physics (B. Moussallam, K. Hayasaka, J. Hisano)
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Belle II Golden Modes
Experimental/Theoretical precision to be achieved are currently scrutinized in B2TiP
https://belle2.cc.kek.jp/~twiki/bin/view/B2TiP/B2TIPGoldenModes
• New physics search through precision measurement and rare decay
• Not only B physics but also charm, tau and quarkonium
UT angles: Φ1Φ2Φ3 (α,β,γ)
Electroweak penguins
Precision measurements
Φ1(β): 1.4o ➞ 0.4o
Φ2(α): 4o ➞ 1o
Φ3(γ): 14o ➞ 1.5o
Inclusive channels
B->Xsl+l- (theory cleaner)
TDCP violation
CPV in B->K* γ/ργ
Leptonic/Semi-leptonic
Missing energy channels!
Br(B->τν): 26% ➞5%
R(B->D*τν): 9% ➞2.3%
Vub,cb inclusive/exclusive puzzles?!
Hadronic B decays
CPV in penguin modes
Kπ puzzles?
Many direct CPV!
Charm!
CPV of charm?!
Many rare decays
Quarkonium/exotics
More exotics!
Dark photon search
Tau!
LFV?!
CPV?!
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Unitarity Triangle
What do we expect in the future? New Physics can manifest itself in the Unitarity Triangle?
50 ab-1
Current
Let us reduce the errors in
Φ1Φ2Φ3 (α,β,γ) by keeping
the central value as it is now.
zoom
SM agree
But if the 3
central values
are all slightly
lower (within
1σ range)...
E. Kou for B2TiP LAL NP-workshop
This is not an odd
case, we find that the
Then, Φ1(β)
chance to have >5σ
might actually
deviation is 30 % for
be much
now!
larger?
8σ deviation!
New
physicsPreliminary
in box???
E. Kou and F. Le
Diberder,
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Belle II impact
Current 2-3σ deviations will be clarified: new physics effect or just statistical fluctuations?!
Example of B->D(*)τν
Example of CPV in B->K*γ
Currently the deviation is ~3σ...
Currently SM (#) consistent...
KH and S. Mishima for B2TiP LAL NP-workshop
A. Ishikawa for B2TiP LAL NP-workshop
(unofficial avg.)
SM
SM
~3σ deviation?
Belle II prospect
Belle II prospect
SM consistent?
(with the current Belle central value, error ∝ 1/√N) (with the current Belle central value)
~14(6)σ deviation with 50(5)ab-1 of data!
~16(6)σ deviation with 50(5)ab-1 of data!
(SM uncertainty to be included)
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(#) SM prediction of CPV in B->K*γ is still under discussion in B2TiP...
B2TiP - Belle II Theory interplay Platform B2TiP (3+ year project) is created based on this TYL collaboration
Deliverable : 300-400 pages of book by early 2017 (before data taking starts)
11/15
11/15
NP-WG
NP-WG
PNNLworkshop
workshop
PNNL
02/16
NP-WG
LAL workshop
* Budget spent for 2015 and budget requested for 2016 (also small
meetings at LAL/KEK foreseen)
A lot of works for Green Report foreseen in 2016-2017
Phase 1(2014)
Identifying the ‘Golden channels’
Phase II (2015)
Detailed studies (theory uncertainties, experimental simulations)  New ideas!
Phase III (2016)
Collecting contribution, finalizing the analysis, discussions on the impact plot
Editing phase (2017)
Editing to make a coherent document
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Summary
Thanks to the TYL support, many fruitful results obtained in
the collaboration
• Analyses of common physics topics to Belle and LHCb
• Leading works in studies of Belle II physics impacts in B2TiP
In 2016,
• More physics results from Belle and LHCb is expected
• Finalize B2TiP analyses and prepare physics impacts plots 
publish B2TiP final reports
 the collaboration work based on the TYL is essential.
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