arXiv subjects

J. O. Eeg

Publications and source records attributed to J. O. Eeg.

28 records · Page 2Linked to original sources

arXiv1998

$ε'/ε$ at $O(p^4)$ in the Chiral Expansion

After updating the determination of the combination of Kobayashi-Maskawa elements $ \Im V_{td}V^*_{ts}$ according to our new estimate of the parameter $\hat B_K$, we study the CP-violating ratio $ε'/ε$ by means of hadronic matrix elements computed to $O(p^4)$ in the chiral expansion. It is the first time that this order in chiral perturbation theory is included. We also discuss the relevance of some $O(p^2)$ terms that are generally neglected in the calculation of the electroweak penguin matrix elements. The most important effect of this improved analysis is the substantial reduction (20%) of the leading electroweak penguin matrix element and accordingly a reduced cancelation between the electroweak and gluon penguin contributions. The ratio $ε'/ε$ is thus larger than previously estimated and its predicted value enjoys a smaller uncertainty. We find $ε'/ε= 1.7 ^{+1.4}_{-1.0} \times 10^{-3}$. Values positive and of the order of $10^{-3}$ are therefore preferred.

hep-ph↗

arXiv1998

The Delta I = 1/2 Rule and B_K at O(p^4) in the Chiral Expansion

We calculate the hadronic matrix elements to $O(p^4)$ in the chiral expansion for the ($ΔS =1$) $K^0 \to 2 π$ decays and the ($ΔS=2$) $\bar K^0$-$K^0$ oscillation. This is done within the framework of the chiral quark model. The chiral coefficients thus determined depend on the values of the quark and gluon condensates and the constituent quark mass. We show that it is possible to fit the $ΔI =1/2$ rule of kaon decays with values of the condensates close to those obtained by QCD sum rules. The renormalization invariant amplitudes are obtained by matching the hadronic matrix elements and their chiral corrections to the short-distance NLO Wilson coefficients. For the same input values, we study the parameter $\hat B_K$ of kaon oscillation and find $\hat B_K = 1.1 \pm 0.2$. As an independent check, we determine $\hat B_K$ from the experimental value of the $K_L$-$K_S$ mass difference by using our calculation of the long-distance contributions. The destructive interplay between the short- and long-distance amplitudes yields $\hat B_K = 1.2 \pm 0.1$, in agreement with the direct calculation.

hep-ph↗

arXiv1997

On the dispersive two-photon K_L -> μ^+ μ^- amplitude

We present a full account of the two-loop electroweak, two-photon mediated short-distance dispersive $K_L \toμ^+μ^-$ decay amplitude. QCD corrections change the sign of this amplitude and reduce it by an order of magnitude. Thus, the QCD-corrected two-loop amplitude represents only a small fraction (with the central value of 5 %) of the one-loop weak short-distance contribution, and has the same sign. In combination with a recent measurement, the standard-model prediction of the short-distance amplitude, completed in this paper, provides a constraint on the otherwise uncertain long-distance dispersive amplitude.

hep-ph↗

arXiv1996

The self-penguin contribution to $K \to 2 π$

We consider the contribution to $K \rightarrow 2 π$ decays from the non-diagonal $s \ra d$ quark transition amplitude. First, we calculate the most important part of the $s \rightarrow d$ transition, the so-called self-penguin amplitude $\sim G_F α_s$, including the heavy top-quark case. Second, we calculate the matrix element of the $s \rightarrow d$ transition for the physical $K \rightarrow 2 π$ process. This part of the analysis is performed within the Chiral Quark Model where quarks are coupled to the pseudoscalar mesons. The CP-conserving self-penguin contribution to $K \rightarrow 2π$ is found to be negligible. The obtained contribution to $ε'/ε$ is sensitive to the values of the quark condensate $<\bar{q} q>$ and the constituent quark mass $M$. For reasonable values of these quantities we find that the self-penguin contribution to $ε'/ε$ is 10-15% of the gluonic penguin contribution and has the same sign. Given the large cancellation between gluonic and electroweak penguin contributions, this means that our contribution is of the same order of magnitude as $ε'/ε$ itself.

hep-ph↗

arXiv1996

The $ΔS = 1$ Weak Chiral Lagrangian as the Effective Theory of the Chiral Quark Model

We use the chiral quark model to estimate the coefficients of the weak chiral lagrangian as obtained from the bosonization of the ten relevant operators of the $ΔS = 1$ effective quark lagrangian. All contributions of order $N_c^2$ as well as $N_c$ and $α_s N_c$ are included. The chiral coefficients are given in terms of $f_π$, the quark and gluon condensates and the scale-dependent NLO Wilson coefficients of the corresponding operators. In addition, they depend on the constituent quark mass $M$, a parameter characteristic of the model. The $γ_5$-scheme dependence of the chiral coefficients, computed via dimensional regularization, and the Fierz transformation properties of the operator basis are discussed in detail. We apply our result to the evaluation of the hadronic matrix elements for the decay $K^0 \rightarrow 2 π$, consistently including the renormalization induced by the meson loops. The effect of this renormalization is sizable and introduces a long-distance scale dependence that matches in the physical amplitudes the short-distance scale dependence of the Wilson coefficients.

hep-ph↗

arXiv1996

A New Estimate of $\varepsilon '/\varepsilon$

We discuss direct $CP$ violation in the standard model by giving a new estimate of $\varepsilon'/\varepsilon$ in kaon decays. Our analysis is based on the evaluation of the hadronic matrix elements of the \mbox{$ΔS =1$} effective quark lagrangian by means of the chiral quark model, with the inclusion of meson one-loop renormalization and NLO Wilson coefficients. Our estimate is fully consistent with the $ΔI =1/2$ selection rule in $K\to ππ$ decays which is well reproduced within the same framework. By varying all parameters in the allowed ranges and, in particular, taking the quark condensate---which is the major source of uncertainty---between $(-200\ {\rm MeV})^3$ and $(-280\ {\rm MeV})^3$ we find $$ -5.0 \times 10^{-3}\ <\varepsilon'/\varepsilon <\ 1.4 \times 10^{-3}\ .$$ Assuming for the quark condensate the improved PCAC result \mbox{$\vev{\bar qq} = -(221\: \pm 17\ {\rm MeV})^3$} and fixing $Λ_{\rm QCD}^{(4)}$ to its central value, we find the more restrictive prediction $$\varepsilon '/\varepsilon = ( 4 \pm 5 ) \,\times \,10^{-4}\ , $$ where the central value is defined as the average over the allowed values of Im $λ_t$ in the first and second quadrants. In these estimates the relevant mixing parameter Im $λ_t$ is self-consistently obtained from $\varepsilon$ and we take $m_t^{\rm pole} = 180 \pm 12$ GeV. Our result is, to a very good approximation, renormalization-scale and $γ_5$-scheme independent.

hep-ph↗

arXiv1996

Momentum Dependence of the Penguin Interaction

We have considered the penguin interaction contribution to $K \rightarrow 2 π$ decays. In particular, we have investigated the effect of the momentum dependence of the penguin coefficient. Our analysis is performed within the Chiral Quark Model where quarks are coupled to the pseudoscalar mesons, which means that hadronic matrix elements can be calculated in terms of quark loop diagrams. We have inserted the momentum dependent penguin coefficient into the relevant quark loop diagrams for $K \rightarrow π$. We discuss two possible prescriptions for performing the calculations, and conclude that the momentum dependence of the penguin coefficient increases the amplitude by 10-20 $\%$. In any case, the (CP-conserving) penguin contribution is very sensitive to the values chosen for the involved parameters.

hep-ph↗

arXiv1995

QUARK OFF-SHELL EFFECTS IN FLAVOUR-CHANGING DECAYS

We discuss some flavour-changing effective Lagrangians, obtained from scales above 1 GeV, which vanish on the quark mass shell. Although the effects of such effective Lagrangians are zero in the limit of vanishing bound-state interactions, we have shown that they have a significant impact on the processes $K\rightarrowγγ$ and $B_s \rightarrowγγ$.

hep-ph↗

arXiv1994

Studying $\varepsilon '/\varepsilon$ in the Chiral Quark Model: $γ_5$-Scheme Independence and NLO Hadronic Matrix Elements

We study the $CP$-violating, $|ΔS| =1$ parameter $\varepsilon '/\varepsilon$ by computing the hadronic matrix elements in the chiral quark model. We estimate the coefficients of the next-to-leading order terms in the chiral expansion that correspond to the operators $Q_6$ and $Q_{11}$. We consider the impact of these corrections on the value of $\varepsilon '/\varepsilon$. We also investigate the possibility that the chiral quark model might drastically reduce the dimensional regularization $γ_5$-scheme dependence of current evaluations of $\varepsilon '/\varepsilon$.

hep-ph↗

arXiv1993

New contribution to anomalous radiative $K^0$-decays

We present a new contribution to the $K_L\rightarrow γγ$ amplitude, which is ${\cal{O}}(p^4)$ within the counting rules of chiral perturbation theory. This direct (non-pole) amplitude, obtained from short-distance $s \rightarrow d γ$ quark diagrams of order $e G_F α_s/π$, and similar $s \rightarrow d γγ$ diagrams, can account for about half of the experimental amplitude. Closely following the description of the $π^0\rightarrow γγ$ and $K_L\rightarrow γγ$ processes in the variants of the same low-energy QCD, we find that both of these processes are anomalous in the same sense. Then, by the anomaly-matching principle, we arrive from the chiral-quark to the bosonic counterparts for both of these processes. In this way we add the $K_L\rightarrow γγ$ decay to the existing list of anomalous radiative prosesses.

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