Observing directly the (weak) arrow of time

Il prof. Fernando Martinez Vidal, del Department of Atomic, Molecular and Nuclear Physics of University of Valencia (Spain) terrà un seminario dal titolo:

Observing directly the (weak) arrow of time

Abstract: The mechanism of CP violation in weak interactions, as arising from the single physical phase in the three-generation CKM matrix, has been validated by more than a decade of intense experimental work probing CP violation, particularly with the studies with B mesons at B factories. This success of the three-generation theory was recognized by the award of a share of the 2008 Nobel Prize in physics to Kobayashi and Maskawa. Since the Standard Model theory is CPT invariant, it predicts that the weak interaction is also time irreversible. However, probing directly the predicted time asymmetry, without using an observation which also violates CP, has been proven difficult. In this seminar we shall discuss how the BaBar experiment at SLAC has conducted a new analysis of the data already used to measure CP violation, to observe for the first time the breaking of time reversal invariance through the exchange of initial and final states in transitions that can only be connected by a T-symmetry transformation. 

Persona di contatto:Alexis Pompili   Questo indirizzo email è protetto dagli spambots. È necessario abilitare JavaScript per vederlo.

Relatore:Prof. Fernando Martinez Vidal