Hideki Miyake,
University of Tsukuba,
on behalf of CDF and DØcollaborations
KEK-PH2010, Feb.18th,2010,Tsukuba,Japan Tevatron as “Hadronic” B-factory See Y.Takeuchi’s talk for Higgs/top

 Rich B programs are on-going Cover a part of Tevatron B-physics
 Rare decay (BR, AFB) BK(*)μμ, Bsφμμ, B(s)μμ, and Bsφφ CP violation (βs)
 BsJ/ψφ B hadron (BR, mass, τ, and polarization)
 Δb, Ωb, Y(1s)don’t cover…Bshh, Charm mixing and so onH.Miyake

KEKPH2010,Tsukuba, Feb.18th, 20102

qbqgbb ProsEnormous cross-section
 All species of b-hadrons Bu,Bd,Bs,Bc,Λb, Σb…

 Consgbgbbqgqggbb
H.Miyake

QCD background x103 larger than σ(bb) Collision rate ~2MHz
 tape writing limit ~100HzSophisticated triggers are very important!

Tevatron B-production enables :- explore various rare decays- measure precise CPV parameters- study wide mass range of b-hadrons
KEKPH2010,Tsukuba, Feb.18th, 20103

Boosterpp collisions at √s=1.96 TeV

>6 fb–1 data on tape for each experiment

Recovery from shut down is in good status

Today we cover 2.8~5fb-1 analysis

CDFTevatron

p source

Main Injector& Recycler

DØCDF II Detector- Central tracking:- silicon vertex detector- drift chamber→ excellent vertex, momentum
and mass resolution- Particle identification: dE/dX and TOF- Electron and muon ID by calorimetersand muon chambers

DØ Detector- Excellent tracking and muon coverage- Excellent calorimetry and electron ID- Silicon layer 0 installed in 2006 improves
track parameter resolution

tracker

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 20106bs FCNC
Promising tool to search for new physics

Tree diagram is forbidden in the SM May occur via higher order loop diagram

NP could enhance the amplitude
Interference with SM amplitude

 Various observables are available
 BR, K* polarization, and AFB

W-b

uct

H.Miyakes b~ 0g,χ

χ-

Huct

s b~~~ucts b

KEKPH2010,Tsukuba, Feb.18th, 2010~dsb~~s7γ,Zbuds

EW penguinsμμsbuds uds

WμμWsuds

W box diagram

Rare decay : bsll


B+K+μ+μ- : [0.52+0.08-0.07]×10-6 (HFAG)

B0K*0μ+μ- :[1.05+0.15-0.13 ]×10-6

Bs φμ+μ- :1.61×10-6 (C.Q.Geng and C.C.Liu, J.Phys.G29:1103-1118,2003)
(HFAG)

BR(Bsφμμ)/BR(BsJ/Ψφ)<2.3(2.6)×10-3 @90(95%) C.L. CDF 0.92fb-1<4.4×10-3 @95% C.L.
DØ 0.45fb-1

CDF updated the analysis with 4.4fb-1

BR AFB
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 20108

Dimuon trigger (pT(μ)>1.5 or 2.0GeV/c)
Employ neural network to optimize event selection
Single final state per decay channel
B+K+μ+μ B0K*0(K+π-) μ+μ

Stat. significance ~9σ

Stat. significance ~10σRelative BR : normalized BR by control channel (J/Ψh)
h=K,K*Rare channel yield

Control channelyieldReconstruction
efficiency

Absolute BR(x10-6)

BaBar (384M BB)

Belle (657M BB)

K+μμ 0.41+0.16-0.15(stat)±0.02(syst)
K*0 μμ 1.35+0.40-0.37(stat) ±0.10(syst)
0.39±0.07(stat)±0.02(syst)
Kll
1.11+0.19-0.18(stat)±0.07(syst)
K*ll
PRL102:091803 (2009)

CDF (4.4fb-1)

0.53+0.08-0.07 (stat)±0.03(syst) 0.38±0.05(stat)±0.03(syst)
1.06+0.19-0.14(stat) ±0.07(syst) 1.06±0.14(stat)±0.09(syst)
0.48+0.05-0.04(stat)±0.03(syst) Same as K+μμ
1.07+0.11-0.10(stat)±0.09(syst) Same as K*0μμ
PRL103:171801 (2009)

The best measurement for single final state!!
{Kπ, Ksπ, Kπ0}*{ee, μμ}{K, Ks}*{ee, μμ}

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201010J/Ψ
veto

Ψ’
veto

Dimuon mass spectrum could showa hint of new physics
appears on differential BR w.r.t. q2
where q2=Mμμ2
six q2 bin (same definition as Belle)

SM maximum allowed
SM minimum allowed

B0K*μμB0K*0μ+μ-

A. Ali, P. Ball, L. T. Handoko and G. Hiller,
Phys. Rev. D61, 074024 (2000)- Consistent with SM- Consistent and competitivewith BaBar and Belle- BaBar, PRL102:091803 (2009)- Belle, PRL103:171801 (2009)

B+K+μμ
B+K+μ+μH.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201011

Similar analysis as BK(*)μμ
Bs φ(K+K-)μ+μBR(Bsφμμ)=[1.44±0.33(stat)±0.46(syst)]×10-6
Consistent with theory ~1.61×10-6

The rarest Bs decay we observed so far!!

Stat. significance ~6σ

Yet another BVll decay Could measure φ polarization : FL

Brand-new probe!

1st observation!
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 2010

μ-B

μ+K+F B0π-B0K*0μμ decay plane
Forward-Backward Asymmetry :where q2=Mμμ2

AFB may show drastically different
behavior under some BSMscenarios

Good probe to explore BSM!

In case of Kμμ, AFB(Kμμ)~0 is expected
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201013

FL: K* polarization

AFB: FB asymmetry

FL=1 for KμμFL: K* polarization

AFB: FB asymmetry- Consistent and competitive with best B-factories results:

BaBar 384M BB, PRD79,031102(R) (2009) andBelle 657M BB, PRL103,171801(2009)- Consistent with the SM and a BSM expectation…

FL: K* polarization

AFB: FB asymmetry

Expect world-leading result by end of this year:- doubled sample- additional triggers- exploit more decay channels

Further reach if Run II extended to 2011

There is much room for improvement!

 Highly suppressed in the SMbs

A. J. Buras, arXiv:0904.4917v1

 Enhanced in NP (up to 100x)
Tree level:R parity violation in SUSY

Loop level:
MFV SM extensions such as 2HDM MSSM
WμWμb

WsWμb

H0/A0μ~χ±sZμμBR(Bμμ) (tanβ)6Current world’s best upper limit:
BR(Bsμμ)<4.7(5.8)x10-8
BR(Bd μμ)<1.5(1.8)x10-8 90(95)% C.L.
PRL 100,101802 (2008)

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201017



Utilize neural network to optimize event selection

BG
SignalVertex displacement

SignalBG
Pointing angle

Dimuon mass

7 kinematic variables
 Preliminary @3.7fb-1 (CDF public note 9892)
 BR(Bsμμ)<3.6(4.3) x10-8 90%(95%)C.L.
 BR(Bdμμ)<6.0(7.6) x10-9 90%(95%)C.L.
KEKPH2010,Tsukuba, Feb.18th, 2010
H.Miyake18


Similar analysis method as CDF
Utilize Boosted Decision Tree

Normalization Channel

Blinded dimuon mass

 Expected limit@5fb-1 (DØ Conf. Note 5906)
 BR(Bsμμ)<4.3(5.3) x10-8 90%(95%)C.L.
Further improvements are ongoing…
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201019

mSUGRA, D. Toback,arXiv:0911.0880v1 (2009)

DØ expected@5fb-1

BR<1x10-8

Expected
performance@8fb-1

Assumedanomalousmuon g-2

BR<2x10-8

SES<SM prediction!

2010 (approved, ongoing : ~8fb-1)


CDF Expected limit: 2x10-8@8fb-1 (6xSM)
Combined with DØ5xSM

2011 (proposal, likely 10fb-1)
Strong constraint on NP
parameters :Could rule-out mSUGRA withTevatron combination at 10fb-1

Combined limit ~O(10-8)

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201020

Dominated by bsss (same as BφK(*))


BR is sensitive to NP due to the loop diagram

Previous result: (1.4+0.6-0.5±0.6)x10-5 by 8 signal@180pb-1

Various BR expectations


QCDF: (2.18±0.1+3.04-1.78)x10-5

pQCD: (3.53+0.83-0.69

+1.67

-1.02

NPB774,64 (2007))x10-5 PRD76,074018 (2007)

Control channel: J/Ψφ

Updated by 2.9fb-1 from 180pb-1~significant improvement
BR: Consistent with SM

Next step: Polarization measurement

21

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201022

- Analogously to the neutral B0 system, CP violation in Bs systemoccurs through interference of decays with and without mixing:

Bs Mass eigenstates: BsL, BsH
Mass difference
Width difference

CP violating phases :A. Lenz and U. Nierste, JHEP 06, 072(2007)- φsNP contributes to both φs and βs

If φsNP dominates :H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201023

Yield fit
N(Bs0)DØ ~ 2000
N(Bs0)CDF ~ 3200

Lifetime fit

βs=0, no flavor tag :τ(Bs0) = 1.53 ± 0.04 (stat) ± 0.01 (syst) ps
ΔΓ = 0.02 ± 0.05 (stat) ± 0.01 (syst) ps-1
PRL 102, 032001 (2009)

τ(Bs0) = 1.487 ± 0.060 (stat) ± 0.028 (syst) ps-1
ΔΓ = 0.085 +0.072
KEKPH2010,Tsukuba,Feb.18th(syst), 2010 ps-0.078 (stat) ± 0.006

24CDF note 9458
(2.8fb-1)
PRL100,161802 (2008)(1.35fb-1)

SM p-value=7%
Observe deviation from SM βs of 1.8σ
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201025

Update from published result- Remove constraints on strong phases δ║, δ┴- Include systematic uncertainties to Δms
PRL101,241801 (2008)

SM p-value=24%
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201026

DØ note 5928, CDF note 9787

Combined
likelihood finds 2.1σ
deviation from SMWorks on new data/methods are ongoing
H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201027H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201028

 Our knowledge of b-hadrons greatly expandedin the last a few years
2006 Σb(*)+ and Σb(*) 2007 Ξb 2008 Ωb

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201029



D0 observes 18Ωb (15Ξb) signals@1.3fb-1


Mass: 6165±10±13 (5774±11±15) MeV/c2
PRL101,232002 (PRL99,052001)

CDF observes 16Ωb (66Ξb) events@4.2fb-1


Mass: 6054.4±6.8±0.9 (5790.9±2.6±0.8) MeV/c2
Lifetime: 1.13+0.53-0.40±0.02 (1.56+0.27-0.25±0.02) psarXiv:0905.3123

ΞbJ/ΨΞΩbJ/ΨΩΞb mass: agreement
Ωb mass: disagreement

We need moredata/channel!

Charm resonant decay channel

CDF observed resonant semileptonic decay channel: ΔbXc(π)μν

First observation of ΔbΔc+π-π+π-

PRD 79, 032001 (2009)848 signals@2.4fb-1
Relative BR

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201031

J/Ψ polarization

 Vector meson polarization
Test of NRQCD (color-octet model)
 Disagreement in Ψ(nS)
Both Run I and II show same trend

PRL99,132001(2007)

 Y(nS) might be better than Ψ(nS)

due to heavy quark mass

where cosθ*: μ+ angle

α=+1: transverse
α=-1: longitudinal
KEKPH2010,Tsukuba, Feb.18th, 2010
H.Miyake32

CDF Public Note 9966



PRL101, 182004 (2008)

CDF measures Y(1S) at 2.9fb-1 while
D0 measures Y(1S) and Y(2S) at 1.3fb-1
Disagreement with NRQCD
Different trend between CDF and D0
No reason to differ…BG polarization?

Further test with 2x data and other Y(nS) and Ψ(nS) Expect D0 result for J/Ψ soon

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201033

 Various B-programs on-going at Tevatron FCNC (BR, AFB) CPV (βs)

 B-hadrons (BR, mass, life time) Doubled data expected and more if Run II

extended to 2011

H.Miyake

KEKPH2010,Tsukuba, Feb.18th, 201034

Di-Muon• Conventional trigger
at hadron collider

1-Displaced track +lepton (e, m)• Wide mass range

120 mm < I.P.(trk) < 1mm

Sillicon Vertex Trigger: SVTPT(lepton) > 4 GeV• Online selection of displaced tracks using SVX• UNIQUE at hadron colliders

Semileptonic modes
2-Displaced tracks
PT(trk) > 2 GeV

Lxy ~ 1 mm

120 mm < I.P.(trk) < 1mm

Level-2 SVT trigger

B decay

SpT > 5.5 GeVPrimary Vertex
Secondary Vertex

H. Miyake

Impact Parameter ( ~100mm)

fully hadronic modes

36