Search for new physics in B to VV decays and other hot topics from Belle

Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 1/20

Search for new physics in B to VV decaysSearch for new physics in B to VV decays and other hot topics from Belleand other hot topics from Belle

Katsumi SenyoKatsumi SenyoNagoya UniversityNagoya University


Today’s topicsToday’s topics

B→ K* update with 253 fb-1

(dataset collected by June `04, 274.5×106 BB)– Polarization– Full angular analysis and new physics search

B+→K* update with 253 fb-1

– Polarization– Branching Fraction

New!

Submitted to

PRL

on Mar.8th , 2005

New! (prelim

inary)

~B ~B →VV decays→VV decays


B decays into two vector mesonsB decays into two vector mesonsPolarization reveals spin structure in the decay

SS SS

SS dd

BSS SS SS SS

SS dd SS dd

K*A0 A A

Helicity amplitudes: A0, AA

11 observables(B and B): 6| Ai |, 5 arg(Ai / Aj) cf. K±: 2 observables: | Ai |, | Ai |, KS: 3 observables: | Ai |, | Ai |, arg(A / A)

A0 requires no spin flip, A+ requires one spin flip A- requires two spin flips.

bb dd

Spin=0


Polarization in B Polarization in B V V decay V V decayAngles in transversity basis

Physics implication and recent experimental results are reviewed here.

Differential cross section looks so complicated,but not, actually.


Polarization in B Polarization in B V V decay V V decay

1~12

222

0

2

022

//

2

0

2

0

B

VL m

mO

AAA

A

AAA

Af

Factorization, as well as simple quantum mechanics predicts:

2

0 2~1, ~ , ~V V

B B

m mA A A

m m

So, the distribution is expected to be dominated by longitudinal polarization( fL~1 )

Is this true?

Longitudinal ~ 1 Transverse ~ 0


B B V V V V treetree decay decay

Yes, it is true for trees.fL~1

Diagrams and tables are from presentation of P.J. Clark@FPCP2004


Polarization puzzle in pure penguin decaPolarization puzzle in pure penguin decays: ys: B B KK**±/±/00 and B and B KK*0*0

But, this is not true in B K* and K*0!!fL deviates from 1 in both Belle and BaBar.

Today

275

275

275

Diagrams and tables are from presentation of P.J. Clark@FPCP2004

Rescattering?An enhanced New Standard Model Amplitude?New Physics?


New physics in B New physics in B KK**±/±/00

• Further, extracting the triple-products asymmetry w/ B flight direction and two meson polarizations (T-odd CP Violation search)

• Experimentally, the following observables are sensitive to new physics:

D. London, N.Sinha and R. Sinha(2004)

(polarization)

subscript i is one of {0, //}.

non-0 possiblew/ FSI


Analysis results for B Analysis results for B KK**±/±/00

What we look at here:

• Confirm fL ≠1 in b s pure penguin decay

• Perform a fully angular analysisSubmitted to PRL, hep-ex/0503013


B B KK**±/±/00: signal extraction: signal extraction

• Mass cuts

• PID

• Event topology

Direct CP Violation ~ 0

BG: qq continuumK+K-K*, f0K*(a few %)

Yields:

B K*0: 173±16 eventsB K*± : 85 +12 events

-11

No updated Branching Fraction results.

253fb-1


B B KK**±/±/00: angular analysis: angular analysisSubmitted to PRL

10.2B K*0) and 5.6B K*±) deviations from 1 in fL

Fully angular analysis is performed.


B B KK**±/±/00: angular analysis: angular analysis

B K*0:DCPV~ 0

B K*0:SM-consistent


B B KK*0*0: new physics search: new physics search

-1.0 -0.5 0.0 0.5 1.0

)(00 Lf

)( ////// f

)( f

0//

0

//

00

////

0//

0

//

VV puzzle(if fL<<1)

Can be non-0(FSI in SM)

NP if non-0

0.45±0.05±0.02

0.24±0.06±0.02

0.31±0.06±0.01

-0.41 ±0.04+0.16-0.14

-0.06±0.10±0.01

-0.06±0.05±0.01

-0.06±0.10±0.01

-0.01±0.06±0.01

0.06±0.05±0.01

0.01±0.10±0.02

-0.16 ±0.03+0.16-0.14

-0.11±0.11±0.02

Submitted to PRL


Analysis results for B Analysis results for B ±±KK*0*0

What we look at here:

• Measure fL and see whether it deviates from 1

• Branching fraction measurementPreliminary results

~Another b~Another b ss pure penguin decaypure penguin decay


BB++ KK*0*0: : E-ME-Mbcbc plots plots

• Nsig = 134.8 ±16.9 (B+ K+ before non- resonant component subtraction)

qq continuum

b →c tran.

B+ K+

253 fb-1


BB++ KK*0*0: M(: M())M(KM(K) fit) fit ~ non-resonant subtraction

: 125.4±15.8 evtsNon res.:-0.3±3.0 evts

K*: 85.4±16.1 evtsNon res.:28.8±4.1 evts

Fit with P-wave Breit-Wigner(+ det.res.) for signal, phase-space for non-res.

S=5.3


systematics

BB++ KK*0*0: Polarization result: Polarization result

fL=0.43±0.11(stat.) +0.05 (syst.)-0.02

coshel coshelK*0

A±

A0

BG

Systematic error from AKinterference is ~ 0.5%

Preliminary results


BB++ KK*0*0: Branching Fraction: Branching Fraction

BF( B+ K*0)=(8.9±1.7(stat.) ±1.0(syst.))×10-6

Systematic uncertaintiesPreliminary results

Measured fL is usedto determine the BF.


SummarySummary• VV polarization puzzle in b s penguin dec

ays (K*/K*) confirmed, fL deviates from 1 for both modes. A fully angular analysis and triple-product correlation investigated for B K*

• Experimental results provide stimulus to theoretical models of B decay


New physics in B New physics in B KK**±/±/0 0 (backu(backup)p)

• All suggested variables by D. London, N. Sinha and R. Sinha(2004).

• param. needs time-dependent analysis, though we have not done yet.


B B KK**±/±/0 0 : details (backup): details (backup)

• Not really. See hep-ex/0503013.


BB++ KK*0*0: details (backup): details (backup)

















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Search for new physics in B to VV decays and other hot topics from Belle