Measurement of CP asymmetry in D-0 -> K- K+ decays
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb−13 fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+→D0π+D⁎+→D0π+ and View the MathML sourceD⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+)ACP(K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→K−π+D0→K−π+, D+→K−π+π+D+→K−π+π+ and View the MathML sourceD+→K‾0π+ decays used as calibration channels. It is found to be
ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%.ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%.
A combination of this result with previous LHCb measurements yields
View the MathML sourceACP(K−K+)=(0.04±0.12 (stat)±0.10 (syst))%,ACP(π−π+)=(0.07±0.14 (stat)±0.11 (syst))%.
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These are the most precise measurements from a single experiment. The result for ACP(K−K+)ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.
ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%.ACP(K−K+)=(0.14±0.15 (stat)±0.10 (syst))%.
A combination of this result with previous LHCb measurements yields
View the MathML sourceACP(K−K+)=(0.04±0.12 (stat)±0.10 (syst))%,ACP(π−π+)=(0.07±0.14 (stat)±0.11 (syst))%.
Turn MathJax on
These are the most precise measurements from a single experiment. The result for ACP(K−K+)ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.
Date Issued
2017-02-03
Date Acceptance
2017-01-27
Citation
PHYSICS LETTERS B, 2017, 767, pp.177-187
ISSN
0370-2693
Publisher
ELSEVIER
Start Page
177
End Page
187
Journal / Book Title
PHYSICS LETTERS B
Volume
767
Copyright Statement
© 2017
The
Author.
Published
by
Elsevier
B.V.
This
is
an
open
access
article
under
the
CC
BY
license
(http://creativecommons.org/licenses/by/4.0/
).
The
Author.
Published
by
Elsevier
B.V.
This
is
an
open
access
article
under
the
CC
BY
license
(http://creativecommons.org/licenses/by/4.0/
).
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000397861700027&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Nuclear
Physics, Particles & Fields
Physics
PP COLLISIONS
TEV
hep-ex
Nuclear & Particles Physics
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
Publication Status
Published