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Belle is an experiment at the KEK B-factory. Its goal is to study the origin of
CP violation.


[一般向け ( 日本語 ) |Introduction (English)]



Belle
members
only


KEK
[English]


KEKB


SuperKEKB


Belle II


"The Physics of B Factories" Book
jointly accomplished by Belle & BaBar !
European Physical Journal C, 74:3026 ( arXiv:1406.6311 )
[ KEK Press Release ( English , Japanese ) ]

Physics achievements from the Belle experiment
Prog. Theor. Exp. Phys. (PTEP) 2012, 04D001 ( arXiv:1212.5342)



New B → D*τν Measurement
Semileptonic-tag Measurement (Improved measurement)
[ Phys. Rev. Lett. 124, 161803 ( arXiv:1904.08794)
presented at Moriond EW 2019 ( slides )]

Review: a challenge to lepton universality in B-meson decays
[ Nature 546, 229 (2017.6.8) , (SharedIt link) ]

New B → K*l+l- Measurement
Search for lepton flavor universarity violation
[ arXiv:1904.02440,
presented at Moriond EW 2019 ( slides )]

Sookyung Choi, the Discoverer of X(3872),
Awarded 2017 Korean Ho-Am Science Prize (2017.04.06)
Ho-Am Foundation site

Fumihiko Takasaki, the Founder of Belle,
Awarded Japan Academy Prize (2017.03.13)
Japan Academy site (in English) / (in Japanese)




Integrated luminosity reached 1000 fb-1
[ KEK press release ( Japanese), interactions.org]

World Record Luminosity of 2.11 x 1034 cm-2 s-1
achieved (June 2009) with crab cavities at KEKB
[ KEK press release ( Japanese), interactions.org, CERN Courier]



Belle results lead to Nobel Prize for
Kobayashi & Maskawa



[ Archive of past "Hot" items ]



- Belle Publications and Talks

Publications:
 * Belle Publications
 * Old Publications
 * Ph.D. and Master Theses
 * Belle Preprint

Talks:
 * Belle Conference Talks
   Upcoming HEP Conferences/Workshops

Posters:
 * Belle Posters

Review reports:
 * Review meetings / KEKB Review report(all)

- Accelerator / Detector

KEKB/Belle operation successfully ended on 30-June-2010.
KEKB/Belle Luminosity:
 * Achieved Records
 * Integrated Luminosity Summary

KEKB/Belle uninstallation:
 * Photo Gallery (KEK archives) [ KEK internal ]
   More photos

Related accelerator links:
 * PEP II Accelerator Performance

- Job Openings

 * KEK : Job Opportunities
 * inSpire job search ("Belle", including Belle II)
 * inSpire job search (field hep-ex)

- Collaboration

 * Organization/Collaboration Information.
 * Institutions in Belle Collaboration (protected)
 * Belle Members List (protected)
 * Belle PHS Numbers List (protected)

- Administration

 * Belle Secretariat  (Contact details)
 * KEK User Registration
 * Radiation worker's Registration
 * KEK Computing System (incl.KEKCC Account Application)
 * Wireless LAN Application
 * Others (take a look in Belle Secretary Top Page)
 * KEK Booth Application Form / Booth Allocation
 * Video conference system (SeeVogh)
 * Belle Photogallery
 * (obsolete) Safety and access to Tsukuba Exp. Hall
 * Radiation Safety at Tsukuba Hall
 * KEK Safety

- Belle Social and Life

 * User Information
 * A Guide to Japanese Visas
 * Snapshots (Photographs of Belle parties)
 * Visitor Information & Life Guide (presented by KEK Users Office)

- Related Links

 * BaBar, CLEO, CDF(B-phys) , D0(B-phys)
   LHCb , CMS
 * CP violation website
 * PDG (Particle Data Group) [KEK mirror]
 * HFLAV (Heavy Flavor Averaging Group),
   CKMfitter , UTfit | Gfitter
 * SLAC Spires (HEP Data Base)
 * HEPIC (High Energy Physics Information Center)
 * B-Lab (Open data analysis program to search for new particles)