Direct CP violation in D meson decays - Rencontres de Moriond
Direct CP violation in D meson decays - Rencontres de Moriond
Direct CP violation in D meson decays - Rencontres de Moriond
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Introduction<br />
S<strong>in</strong>gly Cabibbo-suppressed (SCS) D-<strong>meson</strong> <strong><strong>de</strong>cays</strong> D 0 → π + π − ,D 0 → K + K −<br />
<strong>CP</strong> <strong>violation</strong> <strong>in</strong> SCS D-<strong>meson</strong> <strong><strong>de</strong>cays</strong> is<br />
c<br />
ū<br />
V ∗ uq<br />
Vcq W<br />
sensitive to new physics (NP) <strong>in</strong> the up-quark sector<br />
suppressed <strong>in</strong> the standard mo<strong>de</strong>l (SM):<br />
two-generation dom<strong>in</strong>ance<br />
loop suppression (pengu<strong>in</strong> amplitu<strong>de</strong>s)<br />
GIM mechanism<br />
Naively, expect effects of O<br />
VubVcb<br />
VusVcs<br />
u<br />
¯q<br />
q<br />
ū<br />
<br />
αs<br />
π ∼ 0.01%.<br />
Joachim Brod (University of C<strong>in</strong>c<strong>in</strong>nati) <strong>CP</strong> <strong>violation</strong> <strong>in</strong> D <strong><strong>de</strong>cays</strong> 2 / 26