Search for CP violation in D0→ K0SK0S decays in proton–proton collisions at √s = 13 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
A search is reported for charge-parity CP violation in D0 → K0SK0S decays, using data collected in proton–
proton collisions at √s = 13 TeV recorded by the CMS
experiment in 2018. The analysis uses a dedicated data set
that corresponds to an integrated luminosity of 41.6 fb−1,
which consists of about 10 billion events containing a pair
of b hadrons, nearly all of which decay to charm hadrons.
The flavor of the neutral D meson is determined by the
pion charge in the reconstructed decays D∗+ → D0
π+ and D∗− → D0π−. The CP asymmetry in D0 → K0
SK0S is measured to be ACP(K0SK0S) = (6.2 ± 3.0 ± 0.2 ± 0.8)%, where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of theCP asymmetry in the D0 → K0Sπ+π− decay. This is the first CP asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.
proton collisions at √s = 13 TeV recorded by the CMS
experiment in 2018. The analysis uses a dedicated data set
that corresponds to an integrated luminosity of 41.6 fb−1,
which consists of about 10 billion events containing a pair
of b hadrons, nearly all of which decay to charm hadrons.
The flavor of the neutral D meson is determined by the
pion charge in the reconstructed decays D∗+ → D0
π+ and D∗− → D0π−. The CP asymmetry in D0 → K0
SK0S is measured to be ACP(K0SK0S) = (6.2 ± 3.0 ± 0.2 ± 0.8)%, where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of theCP asymmetry in the D0 → K0Sπ+π− decay. This is the first CP asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.
Date Issued
2024-12-01
Date Acceptance
2024-08-13
Citation
European Physical Journal C, 2024, 84 (12)
ISSN
1434-6044
Publisher
SpringerOpen
Journal / Book Title
European Physical Journal C
Volume
84
Issue
12
Copyright Statement
© CERN for the benefit of the CMS Collaboration 2024 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
License URL
Identifier
https://doi.org/10.1140/epjc/s10052-024-13244-0
Subjects
Physical Sciences
Physics
Physics, Particles & Fields
PROGRESS
Science & Technology
Publication Status
Published
Article Number
1264
Date Publish Online
2024-12-06