dimuon cp asymmetry and new physics in bs-bsbar mixing seungwon baek (korea u) lhc workshop, konkuk...
TRANSCRIPT
![Page 1: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/1.jpg)
Dimuon CP asymmetry and new physics in Bs-Bsbar mixing
Seungwon Baek (Korea U)
LHC Workshop, Konkuk U.Aug 11, 2010
Work in progress with A. Alok, D. London
![Page 2: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/2.jpg)
Outline
• Introduction
• D0 anomaly and NP in Bs-Bsbar mixing
• Non-universal Z’ model
• Flavor changing Z model with vector-like b’
• Conclusions
![Page 3: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/3.jpg)
B physics in the LHC era
• The SM CKM paradigm has been strongly reinforced in B, D, and K decays.
• Several rare decays sensitive to NP also support the SM: ΔMd, ΔMs, B→Xsγ, εK, …
• However, ν-oscillations, evidence for DM, the hierarchy problem of the SM suggests NP, hopefully at TeV scale
![Page 4: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/4.jpg)
• sin2β measurements involving b→s penguins are ~2σ different from S(B→J/ψ KS).
Lunghi, Soni (2009)
![Page 5: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/5.jpg)
●
● Forward-backward asymmetry in
http://www.kek.jp/intra-e/press/2009/BellePress14e.html
![Page 6: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/6.jpg)
deviates from the
SM by 2.2σ●
HFAG (2008)
![Page 7: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/7.jpg)
• All these deviations are in b→s transitions
• These will be much more precisely measured at LHCb– Bs→μ+μ-
– .
–
–
![Page 8: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/8.jpg)
Bs-Bsbar mixing• Mass eigenstates:
• Time evolution:
• Mass and width difference:
![Page 9: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/9.jpg)
D0 like-sign charge asymmetry• With 6.1 fb-1 data, D0 measured
• Wrong sign charge asymmetry
:
2.5σ difference
![Page 10: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/10.jpg)
• If NP only in M12s,
• then, imposing from ,
• NP in can solve the problem !
???
![Page 11: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/11.jpg)
• With NP in the decay …
• No more
![Page 12: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/12.jpg)
Mixing induced CPA in B-decay
• Indirect CPA
• Exp
• SM
![Page 13: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/13.jpg)
Non-universal Z’ model
• Tree-level FCNC
• M12 Γ12
![Page 14: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/14.jpg)
• M12
• Γ12
• Γ12(Z’): considered c, τ-loop only, can compete with the SM when
![Page 15: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/15.jpg)
L couplings only
• After imposing constraints
![Page 16: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/16.jpg)
![Page 17: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/17.jpg)
Flavor changing Z with VL b’
• Introduce vector-like isosinglet b’
• 4x4 down-quark mass matrix
• 3x4 “CKM” matrix V
• U≡V†V≠1 → Z-mediated FCNC at tree-level
![Page 18: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/18.jpg)
![Page 19: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/19.jpg)
![Page 20: Dimuon CP asymmetry and new physics in Bs-Bsbar mixing Seungwon Baek (Korea U) LHC Workshop, Konkuk U. Aug 11, 2010 Work in progress with A. Alok, D. London](https://reader035.vdocuments.us/reader035/viewer/2022062516/56649e615503460f94b5c5da/html5/thumbnails/20.jpg)
Conclusions
• Explained semileptonic charge asymmetry
as well as ,
• In non-universal Z´-model, all the three observables can be accommodated with non-standard operators
• In FC Z-model with VL b´, large , marginal
but cannot explain 1σ of