# The 7th International Workshop on Charm Physics (CHARM 2015)

18-22 May 2015
Wayne State University
US/Eastern timezone
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# Contribution

Wayne State University - C, McGregor

# A new method for measuring CPV in charm decays and the first measurement of F+ in D --> \pi^+\pi^+\pi^-\pi^- decays

## Speakers

• Dr. Sneha MALDE

## Abstract content

A first measurement of F+, the CP-even content of the decay D--> 4pi using quantum correlated psi(3770) to DDbar decays collected by the CLEO-c experiment is presented. A high value is obtained, which makes the decay mode particularly suitable for both measurements of the CKM angle \gamma and charm CP violation in a model independent way. This novel approach to studying indirect CP violation in charm decays is based on the time-dependent inclusive analysis of multibody self-conjugate states. These final states can be used to determine the indirect $CP$-violating observable $A_\Gamma$ and the mixing observable $y_{CP}$, provided that $F_+$, is known. This approach can yield significantly improved sensitivity compared with the conventional method that relies on decays to $CP$ eigenstates. Extensions including direct CP violation are also presented.

## Summary

This abstract is based on the work in arXiv:1502.04560 and the upcoming measurement of F+ in D-->4pi.