Working Group 3 Summary: Vtd, Vts, and Friends

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Working Group 3 SummaryVtd, Vts, and Friends
Jeffrey Berryhill Laurent Lellouch Mikolaj
Misiak Christoph Paus
CKM Workshop, UCSD March 18, 2005
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VtdVts from Rare K Decays K? pnn, KL ?p0nn
Buchalla Theoretically Gold-Plated relations
of BFs to lt Vtd Vts K? pnn rate
VtdVts2 Theory error in Vtd extraction from
BF 10 mostly parametric errors from mc,
Vcb Only 5 error from scale dependence KL
?p0nn rate (Im lt)2 h2 Theory error in h
extraction from BF 3
et al.


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K? pnn Measurement Status
Jaffe
Blind analysis 3 candidate events in the signal
box Background probability 0.001 (gt3s)
BNL E787/E949 Stop kaon, measure outgoing
pion Aggressively and redundantly veto huge
backgrounds
SM


No new data expected 15 precision improvement
from final analysis

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Rare K Decays Summary
K signal in the right range


Interesting SM-like precision is years away

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K0 Mixing Theory Precision
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Bs Mixing Measurements
CKM fits expect Dms 14-24 ps-1
World average Amplitude scan Dms gt 14.5 ps-1

• Amplitude scan
• Fit DAcos(Dm t) at fixed Dm
• Expect A1 for real Dm, 0 otherwise
• Sensitivity Dm such that 1.645sA 1
• 95 CL Dm such that A1.645sA 1

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DØ Bs Mixing in Semileptonics
Abbott

• Bs?Ds m X (460 pb1)
• Ds ?fp
• Enhanced opposite side m tag
• 7037 events (376 tags)
• eD2(1.17?0.04)

Limit Dms gt 5.0ps1 _at_95 CL Sensitivity 4.6
ps1
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CDF Bs Mixing in Semileptonics
Furic

• Bs?Ds lepton (e/m)
• Ds ?fp, KK, ppp
• 4355 events
• Trigger 4GeV e/m track
• Opposite side flavor tags
• e,m,jetchargeeD2(1.43?0.09)

Limit Dms gt 7.7ps1 _at_95 CL Sensitivity 7.3
ps1
For both CDFD0, semileptonic decays rapidly lose
ct resolution at realistic Dms
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CDF Hadronic B decays
Furic

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Bs Mixing, Roadmap to Improvement
Abbott

• More integrated luminosity
• Better flavor tagging
• (same-side K tag)
• Improve proper time resolution
• (event-by-event vertexing)
• Hadronic decays matter more for larger Dms
• D0 tracking upgrade (add small radius silicon
  this summer)
• DAQ/trigger/offline upgrades
• Peril can present trigger efficiency be
  maintained at high instantaneous luminosity?

D0 projections
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Friends of Bs mixing leptonic D decays
Ryd
CLEO-c
CLEO-c measurement of D mn
Extract f(D) from D?mn decay rate 30k fully
reconstructed y? DD- events 8 signal events
with missing mass 0 Can improve to 3
precision for f(D) f(Ds) 2 precision expected
from y(3770)?Ds Ds- running (tn and mn)
BF(D? mn) 3.5 1.4 0.6 10-4 f(D) 202
41 17 MeV LAT 225 13 21 MeV D decay
constants and their ratios check or bound errors
of lattice estimates of B decay constants
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Friends of Bs Mixing B mixing and lifetime
Hastings
Further improvement in B0, B lifetime and B0
mixing from B factories
Belle Dln,hadronic 152 M BB
Asymmetry vs. Dt
lt 1 B factory precision on lifetime and mixing
HFAG average
Belle Dln,hadronic 152 M BB
Mixing and lifetimes from B factories could
ultimately improve by another 2x
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Friends of Bs Mixing recent lifetimes progress
Abbott
DGs/Gs new D0 measurement consistent with
predictions

• New DØ result
• DGs/Gs0.21 0.33-0.45(stat.syst.)
• Constrain tBs1.39 ps
• DGs/Gs0.230.16-0.17(stat.syst.)

Tarantino
HFAG measurements
Predictions

Recent predictions and measurements exhibit no
serious lifetime puzzle
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Radiative Penguin
Nishida
Radiative B decays penguin diagram
Sensitive to New Physics

• b ? s? process has been studied.
• Branching fraction.
• Charge and isospin asymmetry.
• Mixing induced CP asymmtery.

But, b ? d? is not observed yet.

• suppressed byVtd / Vts2 in SM.
• Search for B???, ? ?has been done.

0.04
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Search for B??? , B???
Nishida
Search for B ? ? ? , B0 ? ?0 ?, B0 ? ? ?
Isospin relation
B(B? (?,?) ? ) ? B(B?? ? )
2(?B/?B0)B(B0??0 ? ) 2(?B/?B0)B(B0??? )
Analysis

• Severe continuum background.
• b ? s? (esp. B ? K? ) background.
• Non-negligible BB background.

Simultaneous fit to 3 modes (B ? K? )
SM prediction B(B? (?,?) ? ) (0.9-1.8) 10-6
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b ? d g Branching Fractions Exclusive
Nishida
central value
90 C.L. upper limit
Combined significance BelleBaBar 2.6 s

5s observation in 1-2 years
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Bosch
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Bosch
Inclusive ratio b ?dg /b ?sg better theory
errors for Vtd/Vts, but might need SuperB
factory
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Other Penguin Decays
Friends of rg, Kg Other Penguins
Hollar, Feldmann
B ?K()ll, s ll branching fractions measured by
B factories and theory error already
dominant More will be learned from
distributions and asymmetries B? p ll has
possibility for observation at B factories (not
background limited) rll much harder
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Challenges
A list of future challenges to the Workshop
participants.
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Challenges
To the Tevatron Now that you have a good
shovel, break substantial new ground with it for
Dms constraints.
Upgrades, better tagging, better vertexing, more
luminosity, better DAQ, Whatever it takes! The
flavor physics community is cheering you on!
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Challenges
To the Lattice community Raise the letter
grade above C level for fB, BB et al., so that
the impact of future Tevatron results is
maximized.
Andreas Kronfeld
To CLEO-c et al. Continue to keep the lattice
community honest!
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Challenges
To the B factories Measure a clear signal for
B?rg or drive lower limit off the (CKM) map!
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Challenges
To the heavy quark theory community Improve
and/or realistically bound the impact of
penguins on Vtd/Vts et al. The measurements are
there and ready to be exploited now!
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Challenges
To the Kaon physics community Keep your future
projects alive (and Andrzej out of retirement).
The small theory errors mean these may
ultimately be the best attainable CKM constraints
on Vtd and h.