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

Search for new physics in B to VV decaysand other hot topics from Belle Katsumi Senyo Nagoya University Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Today’s topics ~B →VV decays New! Submitted to PRL on Mar.8th, 2005 B→ f K* update with 253 fb-1 (dataset collected by June `04, 274.5×106BB) • Polarization • Full angular analysis and new physics search B+→r+K* update with 253 fb-1 • Polarization • Branching Fraction New! (preliminary) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

S S S S S S S S S B decays into two vector mesons Polarization reveals spin structure in the decay f B A0 A+ A- d b K* d d d Spin=0 Helicity amplitudes: A0, A+, A- A0 requires no spin flip, A+ requires one spin flip A- requires two spin flips. 11 observables(B and B): 6| Ai |, 5 arg(Ai / Aj) cf. fK±: 2 observables: | Ai |, | Ai |, fKS: 3 observables: | Ai |, | Ai |, arg(A / A) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Polarization in B  V V decay Angles in transversity basis Differential cross section looks so complicated,but not, actually. Physics implication and recent experimental results are reviewed here. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Polarization in B  V V decay Factorization, as well as simple quantum mechanics predicts: Longitudinal ~ 1 Transverse ~ 0 So, the distribution is expected to be dominated by longitudinal polarization( fL~1 ) Is this true? Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B  V V tree decay Diagrams and tables are from presentation of P.J. Clark@FPCP2004 Yes, it is true for trees. fL~1 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Today 275 275 275 Polarization puzzle in pure penguin decays: B f K*±/0 and B r -K*0 • Rescattering? • An enhanced New Standard Model Amplitude? • New Physics? Diagrams and tables are from presentation of P.J. Clark@FPCP2004 But, this is not true in B f K* and r-K*0!! fL deviates from 1 in both Belle and BaBar. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

New physics in B f K*±/0 • 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: subscript i is one of {0, //}. (polarization) non-0 possible w/ FSI D. London, N.Sinha and R. Sinha(2004) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Analysis results for B f K*±/0 What we look at here: • Confirm fL≠1 in bs pure penguin decay • Perform a fully angular analysis Submitted to PRL, hep-ex/0503013 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B f K*±/0: signal extraction 253fb-1 • Mass cuts • PID • Event topology Yields: B f K*0:173±16 events B f K*±:85 +12 events -11 BG: qq continuum K+K-K*, f0K*(a few %) No updated Branching Fraction results. Direct CP Violation ~ 0 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B f K*±/0: angular analysis Submitted to PRL Fully angular analysis is performed. 10.2s (B f K*0) and 5.6s (B f K*±) deviations from 1 in fL Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B f K*±/0: angular analysis B f K*0: DCPV~ 0 B f K*0: SM-consistent Belle B->VV, XXXX Recontres de Moriond - Mar. 11

-0.41 ±0.04 +0.16 -0.14 -0.16 ±0.03 +0.16 -0.14 B f K*0: new physics search VV puzzle (if fL<<1) 0.45±0.05±0.02 0.24±0.06±0.02 0.31±0.06±0.01 Can be non-0 (FSI in SM) -0.06±0.10±0.01 -0.06±0.10±0.01 -0.06±0.05±0.01 NP if non-0 -0.01±0.06±0.01 0.06±0.05±0.01 0.01±0.10±0.02 -0.11±0.11±0.02 Submitted to PRL Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Analysis results for B r±K*0 What we look at here: • Measure fL and see whether it deviates from 1 • Branching fraction measurement ~Another bspure penguin decay Preliminary results Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B+r+K*0: DE-Mbc plots 253 fb-1 • Nsig = 134.8 ±16.9 (B+p+p-p0K+ before non- resonant component subtraction) B+p+p-p0K+ b →c tran. qq continuum Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B+r+K*0: M(pp0) / M(Kp) fit ~ non-resonant subtraction S=5.3s K*: 85.4±16.1 evts Non res.:28.8±4.1 evts r: 125.4±15.8 evts Non res.:-0.3±3.0 evts Fit with P-wave Breit-Wigner(+ det.res.) for signal, phase-space for non-res. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

cosqhelr+ cosqhelK*0 systematics fL=0.43±0.11(stat.) +0.05 (syst.) -0.02 B+r+K*0: Polarization result A0 A± BG Preliminary results Systematic error from ArKp interference is ~ 0.5% Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B+r+K*0: Branching Fraction BF( B+r+K*0) =(8.9±1.7(stat.) ±1.0(syst.))×10-6 Preliminary results Systematic uncertainties Measured fL is usedto determine the BF. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

Summary • VV polarization puzzle in bs penguin decays (f K*/r-K*) confirmed, fL deviates from 1 for both modes. A fully angular analysis and triple-product correlation investigated for B f K* • Experimental results provide stimulus to theoretical models of B decay Belle B->VV, XXXX Recontres de Moriond - Mar. 11

New physics in B f K*±/0 (backup) • All suggested variables by D. London, N. Sinha and R. Sinha(2004). • r param. needs time-dependent analysis, though we have not done yet. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B f K*±/0 : details (backup) • Not really. See hep-ex/0503013. Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B+r+K*0: details (backup) Belle B->VV, XXXX Recontres de Moriond - Mar. 11

B+r+K*0: details (backup) 0.5 Belle B->VV, XXXX Recontres de Moriond - Mar. 11

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