The BABAR Collaboration has recently reported the measurement of the ratio of the branching fractions of " B ! DðD Ã Þ À " to " B ! DðD Ã Þ' À " ' which deviates from the Standard Model prediction by 2 (2:7). This deviation goes up to 3:4 level when the two measurements in the D and D Ã modes are taken together and could indicate new physics. Using an effective Lagrangian for the new physics, we study the implication of these results and calculate other observables that can shed light on the nature of the new physics. We show that the measurements of the forward-backward asymmetries and the and D Ã polarization fractions can be distinguished among the various couplings of the new physics operators.

We perform a comprehensive study of the impact of new-physics operators with different Lorentz structures on decays involving the b → sµ + µ − transition. We examine the effects of new vector-axial vector (VA), scalar-pseudoscalar (SP) "' and tensor (T) interactions on the differential branching ratios and forward-backward asymmetries (A F B 's) ofB T , and the longitudinal-transverse asymmetry A LT . We identify the Lorentz structures that would significantly impact these observables, providing analytical arguments in terms of the contributions from the individual operators and their interference terms. In particular, we show that while the new VA operators can significantly enhance most of the asymmetries beyond the Standard Model predictions, the SP and T operators can do this only for A F B inB

We present the most general (six-helicity) angular analysis of B 02 ) (V i is a vector meson, and P i , P ′ i are pseudoscalars). We focus on final states accessible to both B 0 s and B 0 s -these are mainlyb →s penguin decays. We also derive the most general decay amplitude, and discuss the differences between it and that used by LHCb in its analysis of B 0 s → φφ. In the standard model, all CP violation is predicted to be small, so that the simple measurement of a sizeable CP-violating observable indicates the presence of new physics. A full fit to the data is not necessary. By determining which of the CP-violating observables are nonzero, one can learn about the structure of the underlying NP. Finally, we apply the angular analysis to B 0 s → K * 0K * 0 , and show that there are numerous CP-violating observables that remain in the untagged data sample.

In a recent paper we performed a comprehensive study of the impact of new-physics operators with different Lorentz structures onB → DIn this work we extend the previous calculation by including tensor operators. In the case ofB → D * + τ −ν τ , we present the full three angle and q 2 angular distribution with tensor new physics operators with complex couplings. The impact of the tensor operators on various observables in the angular distribution, specially the azimuthal observables including the CP violating triple product asymmetries are discussed. It is shown that these azimuthal observables are very useful in discriminating different new physics operators. Finally we consider new physics leptoquark models with tensor interactions and show how the presence of additional scalar operators modify the predictions of the tensor operators.

We suppose that there is new physics (NP) inb →s transitions, and examine its effect on the angular distribution of B, where V 1,2 are vector mesons. We find that, in the presence of such NP, the formulae relating the parameters of the untagged, time-integrated angular distribution to certain observables (polarization fractions, CP-violating triple-product asymmetries, CP-conserving interference term) must be modified from their standard-model forms. This modification is due in part to a nonzero B 0 q -B 0 q width difference, which is significant only for B 0 s decays. We re-analyze the B 0 s → φφ data to see the effect of these modifications. As ∆Γ s /2Γ s ∼ 10%, there are O(10%) changes in the derived observables. These are not large, but may be important given that one is looking for signals of NP. In addition, if the NP contributes to theb →s decay, the measurement of the untagged time-dependent angular distribution provides enough information to extract all the NP parameters.