نتایج جستجو برای: gluonic penguin
تعداد نتایج: 3056 فیلتر نتایج به سال:
Complete next-to-leading (chiral) order (NLO) expressions for the strong isospin-breaking (IB) contributions in K → ππ are used to discuss (1) for CP-even, the impact on the magnitude of the ∆I = 1/2 Rule, and (2) for CP-odd, the strong IB correction, Ωst, for the gluonic penguin contribution to ǫ /ǫ, with particular emphasis on the strong low-energy constant (LEC) and loop contributions, numer...
The mass difference of c and u quarks is similar to the energy needed to excite gluonic degrees of freedom in strong QCD. This underpins the degeneracy of D and a recently observed candidate hybrid excitation of the π at∼ 1.8GeV and may generate a strong analogue of Penguin mixing together with a measurable CP-violation in D and Ds decays. E-mail : [email protected] Work supported in part by the ...
A variety of CP violating asymmetries in B” decays is predicted in the Standard Model in terms of CKM (CabibboKobayashi-Maskawa) complex phases. These phases can also be determined from rate measurements of certain B+ and Bdecays. We focus on the following processes: B” + (CIKs, ?~+lr-, rr”o?ro, pier’, B, + D:K-, ~‘7, B+ + D’($)K+, rr+rr’, ?r’K+, ?r+K’, qKf and their charge-conjugates. Complica...
We have studied two-body charmless hadronic decays of B mesons into the nal states K and K. Using 9.7 million B B pairs collected with the CLEO II detector, we observe the decays B ? ! K ? and B 0 ! K 0 with the following branching fractions: ?1:7) 10 ?6. We also see evidence for the decays B 0 ! K 0 and B ? ! K ?. However, since the statistical signiicance is not overwhelming for these modes w...
Isospin-breaking effects, in particular those associated with electroweakpenguin contributions and π-η, η mixing, have long been known to affect the Standard Model prediction of ǫ/ǫ in a significant manner. We have found an heretofore unconsidered isospin-violating effect of importance; namely, the u-d quark mass difference can spawn |∆I| = 3/2 components in the matrix elements of the gluonic p...
A recently proposed Non-Standard Model solution to the problem of low semileptonic branching ratio BSL which suggests a large branching ratio for the decay b → sg is critically examined. It is shown that the effects of the Enhanced Chromomagnetic Dipole Operator might lead to significant violations of isospin symmetry in rare radiative decays of B-mesons. Typeset using REVTEX 1 It has been rece...
While the top quark is con ned to virtual reality for CLEO, the increased luminosity of the Cornell Electron Storage Ring (CESR) and the improved photon detection capabilities of the CLEO II detector have allowed for a rich program in the physics of CLEO's \heavy" quarks | bottom and charm. I will describe new results in the B meson sector including the rst observation of exclusive b! u` decays...
The recent observations of f0(980) in charmless B-decays motivate further studies of scalar particle and glueball production in these processes. Amplitudes for charmless 2-body B decays involving the members of the scalar nonet are presented based on the symmetries of the dominant penguin contribution. Different scenarios for the lightest scalar nonet are investigated in view of the presently a...
In left-right models the gluonic penguin contribution to b-->ss;s transition is enhanced by m(t)/m(b) due to the presence of (V+A) currents and by large values of loop functions. Together those effects may overcome the suppression due to the small left-right mixing angle xi less, similar 0.013. Two independent new phases in the B-->phiK(S) decay amplitude appearing in a large class of left-righ...
The recent observations of f0(980) in charmless B-decays motivate further studies of scalar particle and glueball production in these processes. Amplitudes for charmless 2-body B decays involving the members of the scalar nonet are presented based on the symmetries of the dominant penguin contribution. Different scenarios for the lightest scalar nonet are investigated in view of the presently a...
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