Working Group 3 Summary:Working Group 3 Summary:VVtdtd, V, Vtsts, and Friends, and Friends

Jeffrey BerryhillLaurent Lellouch

Mikolaj MisiakChristoph Paus

CKM Workshop, UCSDMarch 18, 2005

K Bs B

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Buchalla

Theoretically “Gold-Plated”relations of BFs to t = Vtd Vts*

KK++→ → rate ~ |Vrate ~ |VtdtdVVtsts*|*|22

Theory error in |VTheory error in |Vtdtd| extraction from BF ~10%| extraction from BF ~10%mostly parametric errors from mmostly parametric errors from mcc, V, Vcbcb

Only 5% error from scale dependence Only 5% error from scale dependence

KKLL → →rate ~ (Im rate ~ (Im tt))2 2 ~ ~ 22

Theory error in Theory error in extraction extraction from BF ~3%from BF ~3%

VVtdtdVVtsts* from Rare K Decays: K* from Rare K Decays: K++→→ , K, KLL

→→

K

et al.

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KK+→ K+→ Measurement Measurement

StatusStatus

Blind analysis3 candidate events in the signal boxBackground probability = 0.001 (>3)

Jaffe

BNL E787/E949: Stop kaon, measure outgoing pionAggressively and redundantlyveto huge backgrounds

No new data expected15% precision improvement from final analysis

SM

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Rare K Decays: SummaryRare K Decays: Summary

K

Interesting SM-like precisionis years away

K+ signal in the right range

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K KK00 Mixing: Theory Precision Mixing: Theory Precision

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K

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Bs

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Bs Mixing Measurements

Amplitude scanFit D*A*cos(m t) at fixed mExpect A=1 for real m, 0 otherwiseSensitivity: m such that 1.645A =1

95% CL: m such that A+1.645A = 1

CKM fits expect ms ≈ 14-24 ps-1

Bs

World average“Amplitude scan”ms > 14.5 ps-1

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DØ Bs Mixing in Semileptonics

Limit: ms > 5.0ps–1 @95% CLSensitivity: 4.6 ps–1

Bs• BsDs X (460 pb–1)

– Ds – Enhanced opposite side

tag

– 7037 events (376 tags) D2=(1.170.04)%

Abbott

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CDF Bs Mixing in Semileptonics

• BsDs + lepton (e/)– Ds , K*K, – 4355 events – Trigger: 4GeV e/ + track– Opposite side flavor tagse,,jetchargeD2=(1.430.09)%

Limit: ms > 7.7ps–1 @95% CLSensitivity: 7.3 ps–1

Bs

For both CDF+D0, semileptonic decaysrapidly lose ct resolution at realistic ms

Furic

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CDF Hadronic B decays

FuricBs

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Bs Mixing, Roadmap to Improvement

• More integrated luminosity• Better flavor tagging (same-side K tag)• Improve proper time

resolution (event-by-event vertexing)• Hadronic decays matter

more for larger ms

• D0 tracking upgrade (add small radius silicon this summer)

• DAQ/trigger/offline upgrades

• Peril: can present trigger efficiency be maintained at high instantaneous luminosity?

Bs Abbott

D0 projections

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Friends of BFriends of Bss mixing: leptonic mixing: leptonic D decaysD decaysBs Ryd

CLEO-c measurement of D+ mn

Extract f(D+) from D+→decay rate

30k fully reconstructed ’’→ D+D- events8 signal events with missing mass = 0

Can improve to 3% precision for f(D+)

f(Ds+) 2% precision expected from

(3770)→Ds+ Ds

- running ( and )

CLEO-c

BF(DBF(D++→ → ) = 3.5 ± 1.4 ± 0.6 10) = 3.5 ± 1.4 ± 0.6 10-4-4

f(Df(D++) = 202 ) = 202 ± ± 41 41 ± ± 17 MeV17 MeVLAT = 225 LAT = 225 ± ± 13 13 ± ± 21 MeV21 MeVD decay constants and their ratiosD decay constants and their ratioscheck or bound errors of latticecheck or bound errors of latticeestimates of B decay constantsestimates of B decay constants

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Friends of BFriends of Bss Mixing: B mixing and lifetime Mixing: B mixing and lifetimeBs

Mixing and lifetimes from B factoriescould ultimately improve by another 2x

HFAG average

Asymmetryvs. |t|

Further improvement in B0, B+ lifetime and B0 mixing fromB factories

Hastings

< 1% B factory precisionon lifetime and mixing

BelleD*lhadronic

BelleD*lhadronic

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18

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Friends of BFriends of Bss Mixing: recent lifetimes Mixing: recent lifetimes

progressprogress

BsAbbott

ss : new D0 measurement consistent with predictions• New DØ result

s/s=0.21 +0.33-0.45(stat.+syst.)

• Constrain Bs=1.39 ps

s/s=0.23+0.16-0.17(stat.+syst.)

Tarantino

Recent predictions and measurements exhibit no serious “lifetime puzzle”

HFAG measurements

Predictions

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Radiative Penguin

Radiative B decays : penguin diagramSensitive 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 by

|Vtd

/ Vts|2 in SM.

● Search for B, has been done.

~ 0.04

B Nishida

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Search for B , BSearch for B+ +

, B0 0 , B0 Isospin relation

B(B (,) ) B(B++ ) = 2(B+/B0)B(B00 )= 2(B+/B0)B(B0 )

SM prediction: B(B (,) ) = (0.9-1.8) × 10-6

Analysis●Severe continuum background.●b s (esp. B K* ) background.●Non-negligible BB background.

Simultaneous fit to 3 modes (+B K* )

B Nishida

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bb dd Branching Fractions: Branching Fractions: ExclusiveExclusive

central value 90% C.L. upper limit

B

Combined significance Belle+BaBar = 2.6

5 observation in 1-2 years

Nishida

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BBosch

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B Bosch

Inclusive ratio b →d /b →sbetter theory errors for Vtd/Vts, but might need SuperB factory

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BFriends of Friends of , K*, K*: Other : Other

PenguinsPenguinsOther Penguin Decays

Hollar, Feldmann

B →K(*)ll, s ll branching fractionsmeasured by B factories and theory error already dominant

More will be learned from distributionsand asymmetries

B→ ll has possibility for observation at B factories(not background limited) ll much harder

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ChallengesChallenges

A list of future challenges to the Workshop participants.

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ChallengesChallenges

To the Tevatron: Now that you have a good shovel,break substantial new ground with it for ms constraints.

Bs

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 Challenges

To the Lattice community: Raise the “letter grade”above “C” level for fB, BB et al., so that the impactof future Tevatron results is maximized.

Bs

Andreas Kronfeld

To CLEO-c et al.: Continue to keep the lattice community honest!

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Challenges Challenges

To the B factories: Measure a clear signal for B→or drive lower limit off the (CKM) map!

B

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Challenges Challenges

To the heavy quark theory community: Improve and/or realistically bound the impact of penguinson Vtd/Vts et al. The measurements are there andready to be exploited now!

B

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Challenges Challenges

To the Kaon physics community: Keep your future projects alive (and Andrzej out of retirement). The small theory errors mean these may ultimately bethe best attainable CKM constraints on Vtd and .

K