Measurement of the Direct $CP$-Violating Parameter $A_{CP}$ in the Decay $D^+ \to K^-\pi^+\pi^+$ - INSPIRE

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Measurement of the Direct $CP$ -Violating Parameter $A_{CP}$ in the Decay $D^+ \to K^-\pi^+\pi^+$

D0

Collaboration

Aug 28, 2014

8 pages

Published in:

Phys.Rev.D 90 (2014) 11, 111102

Published: Dec 11, 2014

e-Print:

1408.6848 [hep-ex]

DOI:

10.1103/PhysRevD.90.111102

PDG:

\mathit A_{\mathit CP}({{\mathit K}^{\mp}}

{{\mathit \pi}^{\pm}}

{{\mathit D}^{+}}

\rightarrow

{{\mathit K}^{-}}

{{\mathit \pi}^{+}}

{{\mathit D}^{-}}

\rightarrow

{{\mathit K}^{+}}

{{\mathit \pi}^{-}}

Report number:

FERMILAB-PUB-14-309-E

Experiments:

FNAL-E-0823

View in:

reference search8 citations

Citations per year

Abstract: (APS)

We measure the direct CP-violating parameter ACP for the decay of the charged charm meson, D+→K-π+π+ (and charge conjugate), using the full 10.4 fb-1 sample of pp¯ collisions at s=1.96 TeV collected by the D0 detector at the Fermilab Tevatron collider. We extract the raw reconstructed charge asymmetry by fitting the invariant mass distributions for the sum and difference of charge-specific samples. This quantity is then corrected for detector-related asymmetries using data-driven methods and for possible physics asymmetries (from B→D processes) using input from Monte Carlo simulation. We measure ACP=[-0.16±0.15(stat)±0.09(syst)]%, which is consistent with zero, as expected from the standard model prediction of CP conservation, and is the most precise measurement of this quantity to date.

Note:

Submitted to Phys. Rev. D Rapid Communications

13.25.Ft
11.30.Er
asymmetry: CP
charge: asymmetry
invariance: CP
numerical calculations: Monte Carlo
Batavia TEVATRON Coll
mass spectrum
anti-p p: scattering
D: hadronic decay

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