1. with C.S. Kim and Seungwon Baek
PLB 664,84 (2008)
Jeon, Jong Hun
(Yonsei University)
with C.S. Kim and Seungwon Baek
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2. Outline
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3.
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4. Finally, we have recently observed direct CPV in B system
B factories have produced a lot of interesting results, particularly in measuring indirect CPV in the B system
sin2β=0.6750.026 from ΨKS data (HFAG) indicating that B physics is entering a precision era
Finally, we have recently observed direct CPV in B system
( ACP( Bd →π+K-)=-0.0980.012 (HFAG))
Most branching ratios of charmless B  P P and P V are currently measured with errors about 10% ∼ 20% (mostly based upon 100M B anti-B pairs)
5% ∼ 10% errors on amplitudes
One hopes to have <5% errors on the amplitudes of most modes
more precise information on α and γ (<10±)
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5. Bs Mixing Experimental result Lattice QCD result 2009-02-04
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6. BRs
Experimental results
PQCD results
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7. Direct CP Asymmetries Experimental results PQCD results 2009-02-04
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8. Mixing-induced CP Asymmetries
Experimental results
PQCD results
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9. FCNCs in SM T P
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10. Leptophobic Z’ Model Extra neutral U(1) gauge boson, Z’
- has been considered one of the extensions of the SM
- motivated by
String-inspired GUTs (J.L.Hewett, T.G.Rizzo, M.Cvetic, P.Langacker, etc)
Dynamical symmetry breaking models (G.Buchalla, G.Burdman, etc)
Extra dimension models (M.Masip, A.Pomarol)
Little higgs models (N.Arkani-Hamed, A.G.Cohen, T.Han, etc)
Leptophobic Z’
- does not couple to SM leptons
- introduced to explain the Rb-Rc puzzle at LEP and
anomalous high-ET jet cross section at CDF
- by introducing the superstring inspired models,
i.e., E6 or Flipped SU(5)
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11. comes from heterotic superstring ( )
was the natural anomaly free choice for a GUT group after SO(10)
could have several intermediate mass breaking scales
Maximal breakings of E6 :
If we consider the following breaking chain
U(1)’ can be a linear combination of
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12. directly SU(5) → SM : SU(5) (Geogri-Glashow)
SU(5)XU(1)χ → SM : Flipped SU(5) (S.M.Barr,1982)
Flipped SU(5) is a different breaking pattern of SO(10)
Leptophobic Z’ does not couple to multiplet(f) and singlet(lc)
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13.
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14.
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15.
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16.
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17.
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18.
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19. Conventional Hierarchy in B→Kπ
Large
Small
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20.
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21.
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22.
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23.
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24.
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25.
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26.
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27.
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28. Summary
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29. Back up
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30. Beauty in the B Meson
The beauty of B mesons lies in its large mass or the mass hierarchy:
In the heavy quark limit, mQ  1, we discover:
Flavor symmetry: dynamics unchanged under heavy flavor exchange (b  c), corrections incorporated in powers of 1/mb–1/mc;
Spin symmetry: dynamics unchanged under heavy quark spin flips, corrections incorporated in powers of 1/mb.
B mesons provide an ideal system for studying heavy-to-heavy transitions.
Much progress has been made in understanding heavy-to-light transitions in recent years:
Perturbative approach: naïve factorization, generalized factorization, QCD-improved factorization, pQCD, and SCET;
Nonperturbative approach: flavor SU(3) symmetry.
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31. OPE (Operator Product Expansion )
Rev.Mod.Phys.68,1125(1996)
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32.
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33.
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34.
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35.
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36.
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