Search for $CP$ violation in the phase space of $D^0\rightarrow\pi^+\pi^-\pi^+\pi^-$ decays - INSPIRE

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Search for $CP$ violation in the phase space of $D^0\rightarrow\pi^+\pi^-\pi^+\pi^-$ decays

LHCb

Collaboration

Dec 9, 2016

12 pages

Published in:

Phys.Lett.B 769 (2017) 345-356

Published: Jun 10, 2017

e-Print:

1612.03207 [hep-ex]

DOI:

10.1016/j.physletb.2017.03.062

\mathit CPV

{{\mathit D}^{0}}

{{\overline{\mathit D}}^{0}}

\rightarrow

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

Report number:

LHCB-PAPER-2016-044,
CERN-EP-2016-287

Experiments:

CERN-LHC-LHCb

View in:

reference search41 citations

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Abstract: (Elsevier)

A search for time-integrated CP violation in the Cabibbo-suppressed decay D0→π+π−π+π− is performed using an unbinned, model-independent technique known as the energy test. This is the first application of the energy test in four-body decays. The search is performed for P -even CP asymmetries and, for the first time, is extended to probe the P -odd case. Using proton–proton collision data corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector at centre-of-mass energies of s=7 TeV and 8 TeV, the world's best sensitivity to CP violation in this decay is obtained. The data are found to be consistent with the hypothesis of CP symmetry with a p -value of (4.6±0.5)% in the P -even case, and marginally consistent with a p -value of (0.6±0.2)% in the P -odd case, corresponding to a significance for CP non-conservation of 2.7 standard deviations.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-044.html

p p: scattering
p p: colliding beams
D0: hadronic decay
D0: rare decay
pi: multiple production
sensitivity
phase space
CP: violation
asymmetry: CP
LHC-B

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