Yeo Woong Yoon

Analytic resolution of puzzle in B→Kπ decays

Abstract We present a systematic method to extract each Standard Model (SM)- like hadronic parameter as well as new physics parameters in analytic way for B → K π decays. Using the analytic method to the currently available experimental data, we find two possible solutions physically equivalent: one showing the large SM- like color-suppressed tree contribution and the other showing the large SM- like electroweak penguin contribution. The magnitude of new physics (NP) amplitude and its weak phase are quite large. For instance, we find | P NP / P | = 0.39 ± 0.13 , ϕ NP = 91 ° ± 15 ° and δ NP = 8 ° ± 27 ° , which are the ratio of the NP to the SM penguin contribution, the weak and the relative strong phase of the NP amplitude, respectively.

Production of stoponium at the LHC

Although the Large Hadron Collider (LHC) has not observed supersymmetric (SUSY) partners of the Standard Model particles, their existence is not ruled out yet. One recently explored scenario in which there are light SUSY partners that have evaded current bounds from the LHC is that of a light long-lived stop quark. In this paper we consider light stop pair production at the LHC when the stop mass is between 200 and 400 GeV. If the stops are long-lived they can form a bound state, stoponium, which then undergoes two-body decays to Standard Model particles. By considering the near-threshold production of such a pair through the gluon-gluon fusion process and taking into account the strong Coulombic interactions responsible for the formation of this bound state, we obtain factorization theorems for the stop pair inclusive and differential production cross sections. We also perform a resummation of large threshold logarithms up to next-to-next-to-leading logarithmic accuracy using well-established renormalization group equations in an effective field theory methodology. These results are used to calculate the invariant mass distributions of two photons or two Z bosons coming from the decay of the stoponium at the LHC. For our choices of SUSY model parameters, the stoponium is not detectable above Standard Model backgrounds in \gamma \gamma or ZZ at 8 TeV, but will be visible with 400 fb^(-1) of accumulated data if its mass is below 500 GeV when the LHC runs at 14 TeV.

Investigation of

We investigate the implication of unparticle physics on the B_{u,d}\to (\pi, K) \pi decays under the constraints of the B_{d,s}-\bar B_{d,s} mixing. We found that not only the unparticle parameters that belong to the flavor changing neutral current (FCNC) processes but also scaling dimension d_{\UP} could be constrained by the B_{d,s}-\bar B_{d,s} mixing phenomenology. Employing the minimum \chi^2 analysis to the B_{u,d}\to (\pi, K) \pi decays with the constraints of B_{d,s} mixing, we find that the puzzle of large branching ratio for B_{d}\to \pi^0 \pi^0 and the discrepancy between the standard model estimation and data for the direct CP asymmetry of B^+ \to K^+ \pi^0 and B_d \to \pi^+\pi^- can be resolved well. However, the mixing induced CP asymmetry of B_d\to K_S \pi^0 could not be well accommodated by the unparticle contributions.

B_{u,d}\to (\pi, K) \pi

We investigate the implication of unparticle physics on the B_{u,d}\to (\pi, K) \pi decays under the constraints of the B_{d,s}-\bar B_{d,s} mixing. We found that not only the unparticle parameters that belong to the flavor changing neutral current (FCNC) processes but also scaling dimension d_{\UP} could be constrained by the B_{d,s}-\bar B_{d,s} mixing phenomenology. Employing the minimum \chi^2 analysis to the B_{u,d}\to (\pi, K) \pi decays with the constraints of B_{d,s} mixing, we find that the puzzle of large branching ratio for B_{d}\to \pi^0 \pi^0 and the discrepancy between the standard model estimation and data for the direct CP asymmetry of B^+ \to K^+ \pi^0 and B_d \to \pi^+\pi^- can be resolved well. However, the mixing induced CP asymmetry of B_d\to K_S \pi^0 could not be well accommodated by the unparticle contributions.

decays within unparticle physics

We study the correlation of top asymmetries that are sensitive to the different origin of (a new contribution to) the total asymmetry: loop- or tree-level origins. We find that both the size and sign of the correlation between total and

Investigation of Bu,d→(π,K)π decays within unparticle physics

t\bar{t}j

Correlation of top asymmetries: loop versus tree origins

inclusive asymmetries are inherently different depending on the origin. We demonstrate the correlation by using the color-singlet

IS THERE ANY PUZZLE OF NEW PHYSICS IN B → Kπ DECAYS?

Z^\prime

Radiative decays of a singlet scalar boson through vector-like quarks

and the pure axigluon taken as representative models of loop- and tree-induced total asymmetries. We calculate the next-to-leading order QCD corrections to the

Extracting the CKM phase angle γ(≡ϕ3) from isospin analysis in B→Kπ decays

Z^\prime