search for new physics in b to vv decays and other hot topics from belle
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Search for new physics in B to VV decays and other hot topics from Belle. Katsumi Senyo Nagoya University. Today’s topics. ~B →VV decays. New! Submitted to PRL on Mar.8 th , 2005. B → f K * update with 253 fb -1 (dataset collected by June `04, 274.5 ×10 6 BB ) Polarization - PowerPoint PPT PresentationTRANSCRIPT
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 3/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 4/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 5/20
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.
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 6/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 7/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 8/20
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?
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 9/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 10/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 11/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 12/20
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.
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 13/20
B B KK**±/±/00: angular analysis: angular analysis
B K*0:DCPV~ 0
B K*0:SM-consistent
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 14/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 15/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 16/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 17/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 18/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 19/20
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.
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 20/20
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
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 21/20
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.
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 22/20
B B KK**±/±/0 0 : details (backup): details (backup)
• Not really. See hep-ex/0503013.
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 23/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 24/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 25/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 26/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 27/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 28/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 29/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 30/20
BB++ KK*0*0: details (backup): details (backup)
Katsumi Senyo, Nagoya Univ. Belle B->VV, XXXX Recontres de Moriond - Mar. 11 31/20
BB++ KK*0*0: details (backup): details (backup)
0.5