penguin$58866$ - ορισμός. Τι είναι το penguin$58866$
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Τι (ποιος) είναι penguin$58866$ - ορισμός

CLASS OF FEYNMAN DIAGRAMS
Penguin diagrams; Penguin graph; Penguin graphs; Penguin Diagram; Penguin mechanism

Penguin sweater         
SWEATER KNITTED FOR PENGUINS
Penguin jumper
Penguin sweaters, also known as penguin jumpers, are sweaters knitted for penguins that have been caught in oil slicks.
Google Penguin         
GOOGLE SEARCH ENGINE ALGORITHM UPDATE
User:Fenticus/Google Penguin; Wikipedia talk:Articles for creation/Google Penguin; گوگل پنگوئن
Google Penguin was a codename for a Google algorithm update that was first announced on April 24, 2012. The update was aimed at decreasing search engine rankings of websites that violate Google's Webmaster Guidelines by using now declared Grey Hat SEM techniques involved in increasing artificially the ranking of a webpage by manipulating the number of links pointing to the page.
Giant penguin hoax         
FICTITIOUS BIRD RESULTING FROM A HOAX
Giant Penguin Hoax; Giant-penguin hoax; Tony Signorini
The giant penguin is a creature allegedly seen in Florida during the 1940s, and is at least partly documented to have been a hoax. This legend has no scientific merit, despite there having been giant penguins which became extinct millions of years ago.

Βικιπαίδεια

Penguin diagram

In quantum field theory, penguin diagrams are a class of Feynman diagrams which are important for understanding CP violating processes in the standard model. They refer to one-loop processes in which a quark temporarily changes flavor (via a W or Z loop), and the flavor-changed quark engages in some tree interaction, typically a strong one. For the interactions where some quark flavors (e.g., very heavy ones) have much higher interaction amplitudes than others, such as CP-violating or Higgs interactions, these penguin processes may have amplitudes comparable to or even greater than those of the direct tree processes. A similar diagram can be drawn for leptonic decays.

They were first isolated and studied by Mikhail Shifman, Arkady Vainshtein, and Valentin Zakharov.

The processes which they describe were first directly observed in 1991 and 1994 by the CLEO collaboration.