English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Flavor changing neutral current processes such as $b \to s \gamma$, $b \to sl^+ l^-$, $b \to s \nu \bar{\nu}$, $\epsilon_K$, $\Delta m_B$, $K^+ \to \pi^+\nu \bar{\nu}$ and $\K_L \to \pi^0 \nu \bar{\nu}$ are calculated in thesupersymmetric standard model based on supergravity. We consider twoassumptions for the soft supersymmetry breaking terms. In the minimal case softbreaking terms for all scalar fields are taken to be universal at the GUT scalewhereas those terms are different for the squark/slepton sector and the Higgssector in the nonminimal case. In the calculation we have taken into accountthe next-to-leading order QCD correction to the $b \to s \gamma$ branchingratio, the results from the LEP II superparticles search, and the condition ofthe radiative electroweak symmetry breaking. We show that $\Delta m_B$ and$\epsilon_K$ can be enhanced up to 40% compared to the Standard Model values inthe nonminimal case. In the same parameter region the $b \to s \nu \bar{\nu}$,$K^+ \to \pi^+ \nu \bar{\nu}$ and $\K_L \to \pi^0 \nu \bar{\nu}$ branchingratios are reduced up to 10%. The corresponding deviation in the minimal caseis 20% for $\Delta m_B$ and $\epsilon_K$ and within 3% for the $b \to s \nu\bar{\nu}$, $K^+ \to \pi^+ \nu \bar{\nu}$ and $\K_L \to \pi^0 \nu \bar{\nu}$.For the $b \to s l^+ l^-$ process the significant deviation from the StandardModel is realized only when the $b \to s \gamma$ amplitude has an opposite signto the Standard Model prediction. Significance on these results from possiblefuture improvements of the $b \to s \gamma$ branching ratio measurement and topsquark search is discussed.Comment: 45 pages, 20 EPS figures included. Figures are corrected; references  are added and updated (Jul 23, 1998

Flavor changing neutral current processes inBandKdecays in the supergravity model