Observation of
CP
Violation in Charm Decays
CP
Violation in Charm Decays
File(s)Physics Letters B_712_3_2012.pdf (414.23 KB)
Accepted version
Author(s)
Type
Journal Article
Abstract
A search for charge-parity (
C
P
) violation in
D
0
→
K
−
K
+
and
D
0
→
π
−
π
+
decays is reported, using
p
p
collision data corresponding to an integrated luminosity of
5.9
fb
−
1
collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the charm meson is inferred from the charge of the pion in
D
∗
(
2010
)
+
→
D
0
π
+
decays or from the charge of the muon in
¯
B
→
D
0
μ
−
¯
ν
μ
X
decays. The difference between the
C
P
asymmetries in
D
0
→
K
−
K
+
and
D
0
→
π
−
π
+
decays is measured to be
Δ
A
C
P
=
[
−
18.2
±
3.2
(
stat
)
±
0.9
(
syst
)
]
×
10
−
4
for
π
-tagged and
Δ
A
C
P
=
[
−
9
±
8
(
stat
)
±
5
(
syst
)
]
×
10
−
4
for
μ
-tagged
D
0
mesons. Combining these with previous LHCb results leads to
Δ
A
C
P
=
(
−
15.4
±
2.9
)
×
10
−
4
, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than 5 standard deviations. This is the first observation of
C
P
violation in the decay of charm hadrons.
C
P
) violation in
D
0
→
K
−
K
+
and
D
0
→
π
−
π
+
decays is reported, using
p
p
collision data corresponding to an integrated luminosity of
5.9
fb
−
1
collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the charm meson is inferred from the charge of the pion in
D
∗
(
2010
)
+
→
D
0
π
+
decays or from the charge of the muon in
¯
B
→
D
0
μ
−
¯
ν
μ
X
decays. The difference between the
C
P
asymmetries in
D
0
→
K
−
K
+
and
D
0
→
π
−
π
+
decays is measured to be
Δ
A
C
P
=
[
−
18.2
±
3.2
(
stat
)
±
0.9
(
syst
)
]
×
10
−
4
for
π
-tagged and
Δ
A
C
P
=
[
−
9
±
8
(
stat
)
±
5
(
syst
)
]
×
10
−
4
for
μ
-tagged
D
0
mesons. Combining these with previous LHCb results leads to
Δ
A
C
P
=
(
−
15.4
±
2.9
)
×
10
−
4
, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than 5 standard deviations. This is the first observation of
C
P
violation in the decay of charm hadrons.
Date Issued
2019-05-29
Date Acceptance
2019-05-17
Citation
Physical Review Letters, 2019, 122 (21), pp.211803-1-211803-12
ISSN
0031-9007
Publisher
American Physical Society (APS)
Start Page
211803-1
End Page
211803-12
Journal / Book Title
Physical Review Letters
Volume
122
Issue
21
Copyright Statement
Copyright © 2012 Elsevier Ltd. All rights reserved. NOTICE: this is the author’s version of a work that was accepted for publication in Physics Letters B. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics Letters B, 712(3), 2012. DOI:10.1016/j.physletb.2012.04.060
Copyright URL
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000469334800009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
PRODUCTION ASYMMETRY
PROGRESS
SEARCH
B-S(0)
D-0
Publication Status
Published online
Article Number
211803
Date Publish Online
2019-05-29