The Standard Model confronts CP violation in $D^0 \to \pi^+\pi^-$ and $D^0 \to K^+K^-$ - INSPIRE

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The Standard Model confronts CP violation in $D^0 \to \pi^+\pi^-$ and $D^0 \to K^+K^-$

Enrico Franco
(
- INFN, Rome and
- Rome U.
)
,
Satoshi Mishima
(
- INFN, Rome and
- Rome U.
)
,
Luca Silvestrini
(
- INFN, Rome and
- Rome U.
)

Mar, 2012

23 pages

Published in:

JHEP 05 (2012) 140

e-Print:

1203.3131 [hep-ph]

DOI:

10.1007/JHEP05(2012)140

View in:

ADS Abstract Service

reference search137 citations

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Abstract: (arXiv)

The recently measured direct CP asymmetries in the processes

D^0\to \pi^+\pi^-

and

D^0\to K^+K^-

show a significant deviation from the naive Standard Model expectation. Using a general parameterization of the decay amplitudes, we show that the measured branching ratios imply large SU(3) breaking and large violations of the naive

1/N_c

counting. Furthermore, rescattering constrains the I=0 amplitudes in the

\pi\pi

and

KK

channels. Combining all this information, we show that, with present errors, the observed asymmetries are marginally compatible with the Standard Model. Improving the experimental accuracy could lead to an indirect signal of new physics.

Note:

23 pages, 7 figures. v2: references added, final version to appear in JHEP

CP: violation
asymmetry: CP
branching ratio: measured
amplitude analysis: parametrization
D0: branching ratio
expansion 1/N: color
pi: pair production
K: pair production
standard model: validity test
new physics

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Figures(33)

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•
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•
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