Search for CP violation in D+ -> phi pi+ and Ds+ -> Ks pi+ decays
LHCb collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S. Amato, S. Amerio,, Y. Amhis, L. Anderlini, J. Anderson
TL;DR
This study searches for CP violation in specific D+ and Ds+ meson decays using LHCb data, finding no significant evidence of CP violation within the measured uncertainties.
Contribution
First measurement of CP asymmetry in D+ -> phi pi+ and Ds+ -> Ks pi+ decays using LHCb data at 7 TeV, with no observed CP violation.
Findings
CP asymmetry in D+ -> phi pi+ is (-0.04+/-0.14+/-0.14)%
No CP violation observed across the phi mass region in D+ decay
CP asymmetry in Ds+ -> Ks pi+ is (0.61+/-0.83+/-0.14)%
Abstract
A search for CP violation in D+ -> phi pi+ decays is performed using data collected in 2011 by the LHCb experiment corresponding to an integrated luminosity of 1.0 fb^{-1} at a centre of mass energy of 7 TeV. The CP-violating asymmetry is measured to be (-0.04+/-0.14+/-0.14)% for candidates with K-K+ mass within 20 MeV/c^{2} of the phi meson mass. A search for a CP-violating asymmetry that varies across the phi mass region of the D+ -> K-K+pi+ Dalitz plot is also performed, and no evidence for CP violation is found. In addition, the CP asymmetry in the Ds+ -> Ks pi+ decay is measured to be (0.61+/-0.83+/-0.14)%.
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