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Belle II Theory Interface Platform (B2TIP)


The "Belle II-Theory Interface Platform" is a joint theory-experiment effort to study the potential impacts of the Belle II program.

We plan to organise meetings twice a year gathering theory experts and Belle II members, starting from June 2014 until the end of 2016.

One of the expected outcomes of the project is a "KEK Green Report", summarising all the important observables which will be measured at Belle II, their experimentally achievable precision and their impact on our understanding of the theory (Standard Model and New Physics). This report should also include a "milestones table" clarifying the targets for the first 5 to 10 ab-1 of data as well as for the final goal at 50 ab-1.

Report status and current draft ( link ).

Table of golden modes ( link ).

B2TiP minutes/proceedings ( invenio )

This project is an official activity of Belle II, approved by the executive board of the Belle II Collaboration in February 2014.

Workshop Dates

The 2014 meetings will be held at KEK in June and November, as a satellite meeting of the Belle and Belle II General meetings. There is a possibility of holding one workshop in 2015 at an external location. Individual working groups may choose to hold additional meetings. Please register for the meetings on the linked indico pages.


B2TIP MeetingMeeting AgendaBelle (II) associated meetings
2014 June 16-17 @ KEKworkshop indicoB2GM June 18-21, BGM June 22-23
2014 October 30-31 @ KEK, merged with KEKFF October 28-29. @ KEKworkshop indicoB2GM November 3-6, BGM November 7-8
2015 February 23-25, New Physics WG @ KIT (Local organiser U. Nierste)workshop indico 
2015 April 27-29 @ Krakow (Local organiser A. Bozek)workshop indico 
2015 October 28-29 @ KEK, merged with KEKFF October 26-27 (Tokyo)workshop indicoBGM October 15-16, B2GM October 19-23
2015 November 9-10 @ PNNL, New physics & EWP WGsworkshop indico 
2016 February 22-24 @ LAL, New physics "Follow-up" meetingworkshop indico 
2016 May 23-25 @ Pittsburgh (local organiser V. Savinov)workshop indico Registration Open! 
2016 October/November, Editorial meeting @ MIAPP Munich  


Organising Commitee

Emi KouLAL
Phillip Urquijo (B2 Physics Coord.)Melbourne

Ex Officio

Hiroaki Aihara (B2 EB Chair)Tokyo
Thomas Browder (B2 Spokesperson)Hawaii
Marco Ciuchini (KEK FF Advisory)Rome
Thomas Mannel (KEK FF Advisory)Siegen

Report Editors

Christoph SchwandaHEPHY Vienna
Satoshi MishimaKEK-Theory

Advisory Committee

Tim GershonWarwick
Bostjan GolobIJS Ljubljana
Shoji HashimotoKEK
Francois Le DiberderLAL
Zoltan LigetiLBL
Hitoshi MurayamaIPMU
Matthias NeubertMainz
Yoshihide SakaiKEK
Junko ShigemitsuOhio

Working Groups

The WG definitions and their scopes are given below. They are a guide only, some topics will be of higher priority than others.



Semileptonic & Leptonic B decays

  • Semileptonic , transitions: , , New physics.
    • Exclusive
    • Inclusive
  • Semileptonic and transitions with tau leptons
  • Charged leptonic decays,
  • Radiative leptonic decays,

Guglielmo De Nardo (Naples)

Anze Zupanc (IJS Slovenia)


Minoru Tanaka (Osaka)

Frank Tackmann (DESY)


Ryoutaro Watanabe (IBS)

A. Kronfeld (Fermilab)


Radiative & Electroweak Penguins

  • Radiative
    • Inclusive radiative decays: gamma via inclusive, partial and full reconstruction tagging methods.
    • Inclusive radiative decays: and via sum of exclusive methods.
    • Exclusive radiative decays (polarisation and asymmetries):
      • : , ,
      • : ,,
    • TCPV in Radiative decays, e.g. , (overlap with bottom)
  • Electroweak
    • EWP with neutrinos, ,
    • Inclusive dilepton decays via sum of exclusive, and fully inclusive methods:
    • Exclusive dilepton decays with a focus on electron modes:
  • Rare and forbidden
    • Neutral leptonic decays, , ,
    • Lepton flavour and number violating decays,

Akimasa Ishikawa (Tohoku)

Jared Yamaoka (PNNL)


Ulrich Haisch (Oxford)

Thorsten Feldman (Siegen)



alpha = phi_2 & beta = phi_1

  • : , ,
  • :
    • precision in ,
    • New phases in transitions, , ,
  • TCPV in Radiative decays, e.g. , (overlap with above)

Luigi Li Gioi (MPI Munich)

Alessandro Gaz (Nagoya)

Jure Zupan (Cincinnati)

Satoshi Mishima (KEK)



Gamma = phi_3

  • Charm CP Eigenstates, GLW method (Gronau- London- Wyler) e.g.
  • Doubly Cabbibo suppressed decays, ADS method (Atwood- Dunietz- Soni), e.g.
  • Three body decays, GGSZ Dalitz method (Giri- Grossman- Soffer - Zupan), e.g. ,
  • Combined GLW+ADS method e.g. , ,

Jim Libby (Madras)

Ian Watson (Tokyo)

Yuval Grossman (Cornell)

Monika Blanke (CERN)



Charmless Hadronic B Decay

  • Direct CP Violation
  • modes, angular analyses
  • Charmless hadronic modes,
  • 2 body
  • 3 body with Dalitz methods,
  • Hadronic decays
  • QCD factorisation, flavour symmetry breaking

Pablo Goldenzweig (KIT)


Martin Beneke (TUM)

Cheng-Wei Chiang (NCU)


S. Sharpe (Washington)



  • mixing
  • TCPV in Charm
  • Direct CPV in Charm
  • Rare/Forbidden charm decays and NP: ,
  • Leptonic and Semileptonic charm decays
  • Spectroscopy of charmed hadrons

Giulia Casarosa (Pisa)

Alan Schwartz (Cincinnati)


Alexey Petrov (Wayne)

Alex Kagan (Cincinnati)




  • Bottomonia at
  • Inclusive baryon and meson production in decays
  • Energy scan studies of bottomonia
  • Charmonia, exotic, charmonium-like
    • below the open-charm threshold
    • above the open-charm threshold
  • -Hadron production at

Roman Mizuk


Roberto Mussa (Torino)

Chengping Shen (Beihang)

Bryan Fulsom (PNNL)


Christoph Hanhart (Juelich)

Yuichiro Kiyo (Juntendo)

Antonello Polosa (Rome)


S. Prelovsek (Ljubljana)


Tau, low multiplicity & EW

  • Tau
    • Lepton flavour violating decays
    • properties
    • Lepton universality
    • CP Violation
    • Precision measurements of SM decays
  • Low multiplicity
  • Two Photon Physics
  • Precision electroweak physics ("LEP"-physics)
  • Searches for dark photon in direct production (via kinetic mixing) and exotic final states

Kiyoshi Hayasaka (Niigata)

Torben Ferber (UBC)


Emilie Passemar (Indiana U.)

Junji Hisano (Nagoya)



New Physics

The organisation of this working group is different to the other groups, covering:
  • Benchmark models/points for 5, 10, 50 data (create a “milestone table; which indicates the goal for 5, 10, 50 for given new physics models (providing theoretical predictions for various physics processes with those models))
  • Model dependent/independent constraints fit (to prepare the constraints figure for given observables, public code for the fits)
  • Relation to measurements from other experiments (e.g. LHC, neutrino, dark matter, future experiments)

Ryosuke Itoh (KEK)

Florian Bernlochner (Bonn)

Yutaro Sato (Nagoya)


Ulrich Nierste (KIT)

Luca Silvestrini (Rome)

Jernej Kamenik (IJS Ljubljana)

Silvano Simula (Rome 3)




Working group mandate:

  • organise the Workshops programs, together with the co-conveners,
  • edit the corresponding sections of the KEK report,
  • take responsibility for their section of the golden mode chart (split according to experiment, theory and lattice)
  • distribute the tasks among group members,
  • contact the other working group theory conveners for the common issues,
  • contribute to the New Physics WG
  • Lattice coordinators (in Blue) are also membesr of the "lattice QCD board". The mandate of the lattice QCD board is to collect the requests and questions from the WGs concerning the potential and perspectives of lattice computations for quantities that are not covered by the other coordinators (including those that may not have been computed before). T. Kaneko (the lattice board secretary) will organize meetings with the lattice coordinators whenever necessary.

Mailing Lists

To be included in the general mailing list, (i) contact Phillip Urquijo if you are not a Belle II member, or (ii) subscribe to the list in Sympa if you are a Belle II member.

Editorial Meetings

13 March 2015 agenda link



-- Phillip Urquijo - 2014-04-03




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