Search for CP violation using $T$-odd correlations in $D^+\rightarrow K^+K^0_S\pi^+\pi^-$ and $D_s^+\rightarrow K^+ K^0_S\pi^+\pi^-$ decays

Lees, J.P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D.A.; Palano, A.; Pappagallo, M.; Eigen, G.

doi:10.1103/PhysRevD.84.031103

Search for CP violation using $T$ -odd correlations in $D^+\rightarrow K^+K^0_S\pi^+\pi^-$ and $D_s^+\rightarrow K^+ K^0_S\pi^+\pi^-$ decays

BaBar

Collaboration

•

J.P. Lees
(
- Annecy, LAPP
)

May, 2011

8 pages

Published in:

Phys.Rev.D 84 (2011) 031103

e-Print:

1105.4410 [hep-ex]

DOI:

10.1103/PhysRevD.84.031103

PDG:

\mathit A_{\mathit Tviol}({{\mathit K}_S^0}

{{\mathit K}^{\pm}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

) in

{{\mathit D}^{\pm}}

\rightarrow

{{\mathit K}_S^0}

{{\mathit K}^{\pm}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Report number:

SLAC-PUB-14464,
BABAR-PUB-11-007

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (arXiv)

We search for CP violation in a sample of 20000 Cabibbo-suppressed decays,

D^+\rightarrow K^+K^0_S\pi^+\pi^-

, and 30000 Cabibbo-favored decays,

D_s^+\rightarrow K^+K^0_S\pi^+\pi^-

. We use 520

fb^{-1}

of data recorded by the BaBar detector at the PEP-II asymmetric-energy

e^+e^-

collider operating at center of mass energies near 10.6

GeV

. We search for CP violation in the difference between the

T

-odd asymmetries obtained using triple product correlations of the

D^+

(

D_s^+

) and

D^-

(

D_s^-

) decays, respectively. The

T

violation parameter values obtained are

\mathcal{A}_T(D^+) = (-12.0 \pm 10.0_{stat} \pm 4.6_{syst})\times 10^{-3}

and

\mathcal{A}_T(D_s^+) = (-13.6 \pm 7.7_{stat} \pm 3.4_{syst}) \times10^{-3}

, which are consistent with the standard model expectations.

Note:

8 pages, 12 encapsulated postscript figures, submitted to Physical Review D (RC)

13.25.Ft
11.30.Er
electron positron: annihilation
charm: pair production
CP: violation
time reversal: violation
correlation
D+: hadronic decay
D/s+: hadronic decay
final-state interaction

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