anomalous right-handed top quark couplings kang young lee (konkuk univ.) tevatron b physics kisti...
DESCRIPTION
Contents Introduction B→X s γ decays B q -B q mixing Results Top quark decays Summary -TRANSCRIPT
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Anomalous Right-handed Top Quark Couplings
Kang Young Lee(Konkuk Univ.)
Tevatron B physics workshop @ KISTI 2009. 8. 24.
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Based on
J. P. Lee and KYL, arXiv:0809.0751. J. P. Lee and KYL, Phys. Rev. D 78, 056004 (2008).KYL and W. Y. Song, Phys. Rev. D 66, 057901 (2002).
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Contents
• Introduction
• B→Xsγ decays
• Bq-Bq mixing
• Results• Top quark decays• Summary
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Introduction• LHC : the top quark factory in a sense
• More than 108-109 top quarks will be produced at LHC in a year (if LHC works at full power).
• Top quark couplings will be directly tested.
• Nondiagonal couplings may be observed.
• Anomalous top quark couplings are worth examining at present.
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The CKM matrix
Not directly measured >0.74without unitarity D0 arXiv: 0803.0739CDF Note 8968
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Effective Lagrangian
Vtqeff : measures SM-like left-handed couplings
ξq : measures right-handed couplings
Underlying new physics• Effective electroweak chiral Lagrangian• General Left-Right model (VL
CKM≠VRCKM)
• Etc.
New particles, neutral current interactions are ignored.
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ΔB=1 effective Hamiltonian
Oi : SM operatorsOi‘ : chiral conjugate operators
SM Wilson coefficients
B→Xsγ decays
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Turn on the right-handed couplings
with the new loop functions
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Branching ratio
SM prediction at NNLOfor
M. Misiak and M. Steinhauser, NPB 764, 62 (2007)M. Misiak et al., PRL 98, 022002 (2007).
World average value of measurement HFAG
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Mass and width differences
Schreodinger equation
Note that
Bq-Bq mixing
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Transition amplitude
with
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SM predictions A. Lenz and U. Nierste, JHEP 06, 072 (2007)
Measurements
HFAG
CDF, PRL 97, 242003 (2006)D0, D0 note 5618-CONF
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We obtain
ξb =0
Results
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We obtain
ξs =0
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No CP violation is predicted in Bs-Bs mixing in the SM. (No phase in Vts and Vtb)
Combined analysis of current data of Bs-Bs mixing tells us that there exists some CP violation.
Our prediction of the phase of M12s is dominated
by the phase of Vtqeff.
The phase of Bd-Bd mixing is directly measured.
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ξb =0
A. Lenz and U. Nierste, JHEP 06, 072 (2007)
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ξs =0
sin 2β
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Top quark decays
Nondiagonal top quark decays
which is insensitive to ξs and directly measure Vtseff .
Large deviation from the SM prediction is possible.
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Note that in the SM
Can we measure it?
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• Model independent study on the anomalous right-handed top quark couplings have been performed.
• Combined analysis of B→Xsγ decays and Bq-Bq mixing provides valuable information.
• Constraints on new physics parameters and predictions of departure from the SM are obtained.
• Nondiagonal top quark decays might examine the tsW coupling independently.
Summary
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Backup Slides
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