We calculate the parameters $x$ and $y$ for $D$ meson mixing in Standard Model by considering a dispersion relation between them. The fictitious charm quark of arbitrary mass squared $s$ is turned into an inverse problem, via which at low are solved with perturbative inputs $x(s)$ $y(s)$ from large $s$. It shown that nontrivial solutions exist, whose values around physical scale agree data both CP-conserving CP-violating cases. then predict observables $|q/p|-1\approx 2\times 10^{-4}$...

A bstract The Standard Model prediction for ϵ ′ / based on recent lattice QCD results exhibits a tension with the experimental data. We solve this through W R + gauge boson exchange in SU(2) L × U(1) B − model ‘charge symmetry’, whose theoretical motivation is to attribute chiral structure of spontaneous breaking group and charge symmetry. show that $$ {M_W}_{{}_R}&lt;58 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi>W</mml:mi> </mml:msub>...

A bstract Since the standard model contribution is virtually absent, any observation of direct CP violation in Cabibbo-favored charmed meson decays would be evidence new physics. In this paper, we conduct a quantitative study on D 0 → K − π + , s ηπ and η ′ SU(2) L ×SU(2) R ×U(1) B gauge extension model. model, arises mainly from interference between decay amplitude coming SM left-left current operators that right-right induced by W boson exchange. Interestingly, strong phase two amplitudes...

We construct QCD sum rules for nonperturbative studies without assuming the quark-hadron duality spectral density at low energy on hadron side. Instead, both resonance and continuum contributions to are solved with operator-product-expansion input quark side by treating as an inverse problem. This new formalism does not involve threshold, require Borel transformation stability analysis, can be extended extract properties of excited states. Taking two-current correlator example, we...

We analyze the electromagnetic current correlator at an arbitrary photon invariant mass $q^2$ by exploiting its associated dispersion relation. The relation is turned into inverse problem, via which involved vacuum polarization function $\Pi(q^2)$ low solved with perturbative input of large $q^2$. It found that result for $\Pi(q^2)$, including first derivative $\Pi^\prime(q^2=0)$, agrees those from lattice QCD, and imaginary part accommodates $e^+e^-$ annihilation data. corresponding...

We study the CP violation of universal seesaw model, especially its quark sector. The model is based on SU(2)_L \times SU(2)_R U(1)_{Y^\prime}. In order to count number parameters in sector, we use degree freedom weak basis transformation. For N(3)-generation violating phase sector identified as 3N^2-3N+1 (19). also construct nineteen invariants Yukawa coupling matrices and SU(2) singlet mass three-generation model. interaction terms induced by neutral currents are given an exact formula....

Observables of light hadron decays are analyzed in a model chiral Lagrangian which includes resonance fields vector mesons. In particular, transition form factors investigated for Dalitz $V\to Pl^+l^-$ and $P\to \gamma l^+l^-$ $(V=1^-, P=0^-)$. Moreover, the differential decay width \pi^+\pi^-\gamma$ partial widths $P\to2\gamma, V\to P\gamma, \eta^\prime\to V\gamma, \phi(1020)\to\omega(782)\pi^0$ 3P$ also calculated. this study, we consider contains octet singlet as representation $SU(3)$....

In the left-right symmetric model based on $SU(2{)}_{L}\ifmmode\times\else\texttimes\fi{}SU(2{)}_{R}\ifmmode\times\else\texttimes\fi{}U(1{)}_{B\ensuremath{-}L}$ gauge symmetry, there appear heavy neutral scalar particles mediating quark flavor changing currents (FCNCs) at tree level. We consider a situation where such FCNCs give only sign of while ${W}_{R}$ boson is decoupled, and name it ``semialigned two Higgs doublet model'' because resembles with mildly aligned Yukawa couplings to...

A bstract We study local quark-hadron duality and its violation for the $$ {D}^0-{\overline{D}}^0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>−</mml:mo> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> , {B}_d^0-{\overline{B}}_d^0 <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>d</mml:mi> </mml:msubsup> {B}_s^0-{\overline{B}}_s^0 <mml:mi>s</mml:mi> mixings in ’t Hooft model, offering a laboratory to test QCD...

We study lifetimes of heavy mesons in the 't Hooft model, a large-Nc theory strong interaction two-dimensional spacetime. Since this model is solvable, one can evaluate total decay widths through hadronic amplitudes that are determined unambiguously within formalism. investigate quark-hadron duality by numerically comparing exclusive result and from quark expansion, with contribution Pauli interference being consistently incorporated. Within certain numerical accuracy, we find maximal...

In light of the recent data for $\bar{B}_{(s)}\to D^{(*)}_{(s)}P$ and D_{(s)}V$ decays, we perform a model-independent phenomenological analysis in presence quasi-elastic rescattering. With Wilson coefficients including contributions beyond standard model, lifetimes $B$ meson as well $B^0_d-\bar{B}^0_d$ mixing are investigated clarifying correlations among observables. We show that parameter regions rescattering, size color-suppressed tree amplitudes new physics constrained due to lifetime...

We study a model with down-type SU(2) singlet vector-like quark (VLQ) as minimal extension of the standard (SM). In this model, flavor changing neutral currents (FCNCs) arise at tree level and unitarity $3\times 3$ Cabibbo-Kobayashi-Maskawa (CKM) matrix does not hold. paper, we constrain FCNC coupling from $b\rightarrow s$ transitions, especially $B_s\rightarrow μ^+μ^-$ $\bar{B}\rightarrow X_sγ$ processes. order to analyze these processes, derive an effective Lagrangian which is valid below...

We discuss a supersymmetric model with discrete flavor symmetry . The additional scalar fields which contribute masses of leptons in the Yukawa terms are introduced this model. analyze their potential and find that they have various vacuum structures. show relations among 24 different vacua classify them into two types. derive expressions lepton mixing angles, Dirac CP violating phase Majorana phases for parameters allowed by experimental data angles each type. also study constraints on...

In this Letter, nontrivial analytic structure of the quark propagator is discussed for $B$-meson inclusive decays. Attributed to invalidity standard K\"{a}ll\'{e}n-Lehman spectral representation, complex conjugate poles alter evaluation decay rates, which lead violation quark-hadron duality. As phenomenological observables, widths in $B\to X_c\ell\bar{\nu}$ as well lifetime $B_d^0$ meson are discussed. presence mentioned nonanalytical contributions, possibility resolving $|V_{cb}|$ puzzle...

We study violation of quark-hadron duality for $\bar{B}\to X_ul\nu$ and $D\to X_dl\nu$ decays in the presence right-handed current operator. For this case, we show that has some aspects different from standard model due to existence an instanton. In particular, fermionic zero mode intermediate light quark can give a nonvanishing contribution owing its chirality structure. A duality-violating component arises single instanton is then analytically extracted as finite-distance singularity,...

We present predictions for CP violating phases of the Type-I seesaw model with four-zero textures on Dirac mass matrix. For textures, effective low energy Majorana matrix is parametrized seven parameters. They are three mass-dimensional parameters, two angles and sources. The number these parameters less than that general description neutrino masses, mixing phases. In particular, only independent sources give rise to efficient comprehensive method proposed in this paper investigate seesaw....

An intrinsic parity violating hadronic tau lepton decay is investigated. $τ\to ππην$ the process in which dominant contribution to amplitude due violation. To predict invariant mass spectra and compare them with experimental data, we extend chiral Lagrangian vector mesons so that it incorporates terms $ϕ$ $η^\prime$ mesons. The coefficients of will be determined by fitting branching fractions for $V^I \rightarrow P γ$, 3 P$ $P \to V^I γ$ where $V^I$ denotes $1^-$ $P$ pseudo-scalar $0^-$.

Through B mixing system, one can construct an asymmetry which naively seems to be a time reversal (T) odd quantity.In this article, the two processes (a) -→ B0 and (b) → -are used event number asymmetry.The CP violation of Kaon system denoted as ε K contributes observables we evaluate contribution from explicitly.The is formulated with phase convention independent parameters are invariant under redefinition quark fields.The overall factors dependent decay rates taken into account in...

BaBar collaboration announced that they observed time reversal (T) asymmetry through B meson system. In the experiment, dependencies of two distinctive processes, $$ {B}_{-}\to {\overline{B}}^0 and {\overline{B}}^0\to {B}_{-} (− expresses CP value) are compared with each other. our study, we examine event number difference these processes. contrast to asymmetry, events includes overall normalization for rates. Time dependence is more general it terms absent in one used by collaboration. Both...

Through $B\bar{B}$ mixing system, one can construct an asymmetry which naively seems to be a time reversal (T) odd quantity. In this article, the two processes $(\mathrm{a})\: B_-\rightarrow \bar{B^0}$ and $(\mathrm{b})\: \bar{B^0}\rightarrow B_-$ are used event number asymmetry. The CP violation of Kaon system denoted as $\epsilon_K$ contributes observables we evaluate contribution from explicitly. is formulated with phase convention independent parameters invariant under redefinition quark...

The hadronic tau decay $\tau^- \to \nu_\tau \eta \pi^- \pi^0$ occurs through V-A weak current. In this mode, the vector current contribution is intrinsic parity violating and axial G violating. latter suppressed due to tiny isospin breaking. We have computed both form factors using a chiral Lagrangian with mesons including effect of breaking violation. A numerical result invariant mass distribution shown structure $\rho$ resonance can be seen in respect $M_{\pi^- \pi^0}$.