Presentation on theme: "Rumin Wang G. R.. Lu& Y. D. Yang Work done in collaboration with G. R.. Lu & Y. D. Yang Huazhong Normal University Henan Normal University November 15,"— Presentation transcript:
Rumin Wang G. R.. Lu& Y. D. Yang Work done in collaboration with G. R.. Lu & Y. D. Yang Huazhong Normal University Henan Normal University November 15, 2005, Beijing
3 To solve the polarization anomaly To solve the puzzles Motivation for study
4 Decay amplitude of B to VV in helicity basis: Decay amplitudes in transversity basis: Longitudinal polarization fraction: ( ~0.9 in SM )
5 Tree + penguin : ( Sensitive to NP ) Pure penguin ( Sensitive to NP ) : ?? Surprise
6 Previous study Kagan show increasing nonfactorizable contribution of annihilation diagram to solve anomaly by QCDF( hep-ph/ ). But H.n. Li & Mishima: annihilation contribution is not sufficient to lower f L down to 0.5 by PQCD ( PRD 71, ). Polarization anomaly might be due to large charming penguin contributions and final-state-interactions (FSI) by Colangelo et al. & Ladisa et al. ( PLB 597,291; PRD 70, ). However, H. Y. Cheng et al. have found the FSI effects not able to fully account for this anomaly ( PRD 71, ). We try to solve this anomaly including RPV SUSY effects.
7 To solve the polarization anomaly To solve the puzzles Motivation for study
9 But But in Exp. 11.4x10^(-6) 6.0x10^(-6) ?
10 Previous study Buras et al. point out B to pi pi can be nicely accommodated in the SM through nonfactorizable hadronic interference effects, whereas B to pi K system may indicate NP in the electroweak penguin sector (PRL 92,101804; NPB 697,133). H. N. Li et al. & Y. D. Yang et al. study the next to leading order corrections by PQCD & QCDF, respectively. These higher order corrections may be important for Br(B to pi K), but the can not explain other experimental data( hep-ph/ ;PRD72, ). NP We try to calculate RPV SUSY effects.
12 Theoretical input The effective Hamiltonian in SM R-parity Violating SUSY QCD Factorization
13 The effective Hamiltonian in SM The effective weak Hamiltonian for B decays: Qi are local four-quark operators The decay amplitude in SM:
14 S is the particle spin B is the baryon number L is the lepton number R-parity violating superpotential: R-parity Violating SUSY : Yukawa couplings i, j,k : generation indices C : charge conjugate field
15 The four fermion effective Hamiltonians due to the exchanging of the sleptons: The effective Hamiltonians due to the exchanging of the squarks:
16 R-parity Violating decay amplitude:
17 The total decay amplitude: Naïve factorization, Generalized factorization, QCD factorization, Perturbative QCD, Light-cone QCD sum rules, Lattice QCD, Soft-collinear effective theory, etc.
37 Summary Employed QCDF to study RPV SUSY effects in following modes: o Polarization in B to VV. o Branching ratios & direct CP asymmetry in B to pi pi, pi K. RPV couplings can give a possible solution to the puzzles. Obtain the ranges of RPV couplings, but these are very narrow. The allowed spaces constrained by B to PP are consistent with these by B to VV decays. An explanation is need: o SM is in no way ruled out. o Existence of New Physics. o Many more measurement are in progress.